[10/17] pinctrl: Add PLX Technology OXNAS pinctrl and gpio driver
diff mbox

Message ID 1457005210-18485-11-git-send-email-narmstrong@baylibre.com
State New
Headers show

Commit Message

Neil Armstrong March 3, 2016, 11:40 a.m. UTC
Add pinctrl and gprio control support to PLX Technology OXNAS SoC Family

CC: Ma Haijun <mahaijuns@gmail.com>
CC: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
 drivers/pinctrl/Kconfig         |    9 +
 drivers/pinctrl/Makefile        |    1 +
 drivers/pinctrl/pinctrl-oxnas.c | 1393 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 1403 insertions(+)
 create mode 100644 drivers/pinctrl/pinctrl-oxnas.c

Comments

Linus Walleij March 15, 2016, 2:56 p.m. UTC | #1
On Thu, Mar 3, 2016 at 12:40 PM, Neil Armstrong <narmstrong@baylibre.com> wrote:

> Add pinctrl and gprio control support to PLX Technology OXNAS SoC Family

Be a bit more verbose. Is this MIPS? ARM? How many pins does it have? Etc.

> CC: Ma Haijun <mahaijuns@gmail.com>
> CC: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

This driver has some way to go, but let's work on it!

> +config PINCTRL_OXNAS
> +       bool
> +       depends on OF
> +       select PINMUX
> +       select PINCONF

Why is it not using GENERIC_PINCONF?

> +       select GPIOLIB
> +       select OF_GPIO

I can already see that this driver should use
select GPIOLIB_IRQCHIP and the existing infrastructure
to manage chained IRQs in the gpiolib core.

The driver need to be rewritten for this: see other drivers
using GPIOLIB_IRQCHIP for examples, both GPIO and pin control
drivers use this so there are plenty of examples.

As a result the code will shrink quite a bit.

> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/slab.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/irqchip/chained_irq.h>
> +#include <linux/io.h>
> +#include <linux/gpio.h>

You should only need to include <linux/gpio/driver.h>

> +#include <linux/pinctrl/machine.h>

Why?

> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinmux.h>
> +/* Since we request GPIOs from ourself */
> +#include <linux/pinctrl/consumer.h>

So why do you do this? Is this a copy/paste?

> +#include <linux/version.h>

This looks like something from a porting shim that brings this
same driver to a few different kernel versions. This include should
not be needed.

> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +
> +#include "core.h"
> +
> +#define MAX_NB_GPIO_PER_BANK   32
> +#define MAX_GPIO_BANKS         2
> +
> +struct oxnas_gpio_chip {
> +       struct gpio_chip        chip;
> +       struct pinctrl_gpio_range range;
> +       void __iomem            *regbase;  /* GPIOA/B virtual address */
> +       struct irq_domain       *domain;   /* associated irq domain */

Should not be needed with GPIOLIB_IRQCHIP

> +#define to_oxnas_gpio_chip(c) container_of(c, struct oxnas_gpio_chip, chip)

We nowadays use gpiochip_get_data() to get the state container pointer.
Use this along with gpiochip_add_data(), or even better:
devm_gpiochip_add_data()
which will be merged for v4.6.

> +static struct oxnas_gpio_chip *gpio_chips[MAX_GPIO_BANKS];

Is that really needed? Oh well let's see as we work on this.

> +static int oxnas_dt_node_to_map(struct pinctrl_dev *pctldev,
> +                       struct device_node *np,
> +                       struct pinctrl_map **map, unsigned *num_maps)
> +{

> +       /*
> +        * first find the group of this node and check if we need create
> +        * config maps for pins
> +        */
> +       grp = oxnas_pinctrl_find_group_by_name(info, np->name);
> +       if (!grp) {
> +               dev_err(info->dev, "unable to find group for node %s\n",
> +                       np->name);
> +               return -EINVAL;
> +       }
> +
> +       map_num += grp->npins;
> +       new_map = devm_kzalloc(pctldev->dev, sizeof(*new_map) * map_num,
> +                              GFP_KERNEL);
> +       if (!new_map)
> +               return -ENOMEM;
> +
> +       *map = new_map;
> +       *num_maps = map_num;

Ugh this looks hairy. Can you not use the utility functions from
pinctrl-utils.h with pinctrl_utils_reserve_map() etc?

> +static void oxnas_dt_free_map(struct pinctrl_dev *pctldev,
> +                               struct pinctrl_map *map, unsigned num_maps)
> +{
> +}

Really? You don't fool me. ;)

pinctrl_utils_dt_free_map() from pinctrl-utils.h should be your friend,
if you follow the pattern from other drivers.

> +static void __iomem *pin_to_gpioctrl(struct oxnas_pinctrl *info,
> +                                unsigned int bank)
> +{
> +       return gpio_chips[bank]->regbase;
> +}
> +
> +static inline int pin_to_bank(unsigned pin)
> +{
> +       return pin / MAX_NB_GPIO_PER_BANK;
> +}
> +
> +static unsigned pin_to_mask(unsigned int pin)
> +{
> +       return 1 << pin;
> +}

Those are a bit simplistic. The last one can be replaced by the
this inline:

+ include <linux/bitops.h>

- pin_to_mask(foo);
+ BIT(foo);

> +static int gpio_irq_type(struct irq_data *d, unsigned type)
> +{
> +       if ((type & IRQ_TYPE_EDGE_BOTH) == 0) {
> +               pr_warn("oxnas: Unsupported type for irq %d\n",
> +                       gpio_to_irq(d->irq));
> +               return -EINVAL;
> +       }
> +       /* seems no way to set trigger type without enable irq,
> +        * so leave it to unmask time
> +        */
> +
> +       return 0;
> +}

This will make your interrupt chip accept level IRQ types
which it obviously does not support.

> +static struct irq_chip gpio_irqchip = {
> +       .name           = "GPIO",
> +       .irq_disable    = gpio_irq_mask,
> +       .irq_mask       = gpio_irq_mask,
> +       .irq_unmask     = gpio_irq_unmask,
> +       .irq_set_type   = gpio_irq_type,
> +};

I think you should implement .irq_ack which will ACK the
IRQ before continuing with the IRQ handler.

> +static void gpio_irq_handler(struct irq_desc *desc)
> +{
> +       struct irq_chip *chip = irq_desc_get_chip(desc);
> +       struct irq_data *idata = irq_desc_get_irq_data(desc);
> +       struct oxnas_gpio_chip *oxnas_gpio = irq_data_get_irq_chip_data(idata);
> +       void __iomem *pio = oxnas_gpio->regbase;
> +       unsigned long isr;
> +       int n;
> +
> +       chained_irq_enter(chip, desc);
> +       for (;;) {
> +               isr = readl_relaxed(pio + IRQ_PENDING);
> +               if (!isr)
> +                       break;
> +
> +               /* acks pending interrupts */
> +               writel_relaxed(isr, pio + IRQ_PENDING);

This should not be done here but in the .irq_ack() function that you
should implement in the irq chip.

See drivers/gpio/gpio-pl061.c for inspiration.

> + * This lock class tells lockdep that GPIO irqs are in a different
> + * category than their parents, so it won't report false recursion.
> + */
> +static struct lock_class_key gpio_lock_class;

This is also handled by GPIOLIB_IRQCHIP.

> +static int oxnas_gpio_irq_map(struct irq_domain *h, unsigned int virq,
> +                             irq_hw_number_t hw)
> +{
> +       struct oxnas_gpio_chip *oxnas_gpio = h->host_data;
> +
> +       irq_set_lockdep_class(virq, &gpio_lock_class);
> +
> +       irq_set_chip_and_handler(virq, &gpio_irqchip, handle_edge_irq);

So you use handle_edge_irq() but do not implement .irq_ack(), that
looks wrong.

> +
> +       irq_set_chip_data(virq, oxnas_gpio);
> +
> +       return 0;
> +}

And this is also handled by GPIOLIB_IRQCHIP by the way.

> +static int oxnas_gpio_irq_domain_xlate(struct irq_domain *d,
> +                                      struct device_node *ctrlr,
> +                                      const u32 *intspec,
> +                                      unsigned int intsize,
> +                                      irq_hw_number_t *out_hwirq,
> +                                      unsigned int *out_type)
> +{
> +       struct oxnas_gpio_chip *oxnas_gpio = d->host_data;
> +       int ret;
> +       int pin = oxnas_gpio->chip.base + intspec[0];
> +
> +       if (WARN_ON(intsize < 2))
> +               return -EINVAL;
> +       *out_hwirq = intspec[0];
> +       *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
> +
> +       ret = gpio_request(pin, ctrlr->full_name);
> +       if (ret)
> +               return ret;

No, the IRQchip and gpiochip should be orthogonal.
The irqchip will mark lines as used for IRQ though.
Rely on GPIOLIB_IRQCHIP.

> +
> +       ret = gpio_direction_input(pin);
> +       if (ret)
> +               return ret;

Your irqchip code should set up the hardware for IRQ,
not the xlate function.

> +
> +       return 0;
> +}
> +
> +static struct irq_domain_ops oxnas_gpio_ops = {
> +       .map    = oxnas_gpio_irq_map,
> +       .xlate  = oxnas_gpio_irq_domain_xlate,
> +};

And all this goes away with GPIOLIB_IRQCHIP.

> +       names = devm_kzalloc(&pdev->dev, sizeof(char *) * chip->ngpio,
> +                            GFP_KERNEL);
> +
> +       if (!names) {
> +               ret = -ENOMEM;
> +               goto err;
> +       }
> +
> +       for (i = 0; i < chip->ngpio; i++)
> +               names[i] = kasprintf(GFP_KERNEL, "MF_%c%d", alias_idx + 'A', i);
> +
> +       chip->names = (const char *const *)names;

Clever, however we are discussing adding a method for naming the lines
to the device tree bindings, please see these discussions for information.
Do not use this method plese.

There will be more review comments but I look forward to v2 as the first
step, using more library functions and cutting down the code a bit!

Yours,
Linus Walleij
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Neil Armstrong March 16, 2016, 3 p.m. UTC | #2
On 03/15/2016 03:56 PM, Linus Walleij wrote:
> On Thu, Mar 3, 2016 at 12:40 PM, Neil Armstrong <narmstrong@baylibre.com> wrote:
> 
>> Add pinctrl and gprio control support to PLX Technology OXNAS SoC Family
> 
> Be a bit more verbose. Is this MIPS? ARM? How many pins does it have? Etc.
> 
>> CC: Ma Haijun <mahaijuns@gmail.com>
>> CC: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
> 
> This driver has some way to go, but let's work on it!

Hi Linus,

Thanks a lot for the review.
This driver was initially forked from the at91 driver by Jean-Christophe PLAGNIOL-VILLARD, I just
cleaned it up for upstreaming, but yes it must be rewritten.

I think I'll reboot over a clean base, could you give a reference driver I should follow ?
It's a very simple HW, it should be easy.
> 
> There will be more review comments but I look forward to v2 as the first
> step, using more library functions and cutting down the code a bit!

These first comments are precious !

Could I post a v2 separately for review ?

Thanks,
Neil

> 
> Yours,
> Linus Walleij
> 

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Linus Walleij March 17, 2016, 2:49 p.m. UTC | #3
On Wed, Mar 16, 2016 at 4:00 PM, Neil Armstrong <narmstrong@baylibre.com> wrote:

> I think I'll reboot over a clean base, could you give a reference driver I should follow ?
> It's a very simple HW, it should be easy.

I would look at those merged lately, which has pin control
combined with GPIO and interrupts.

drivers/pinctrl/qcom is good but supports quite a lot of
subvariants so it may be hard to see what parts you really
need. But I think of those as a very nice drivers.

Yours,
Linus Walleij
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Patch
diff mbox

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 99a4c10..1d0c513 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -129,6 +129,15 @@  config PINCTRL_MESON
 	select OF_GPIO
 	select REGMAP_MMIO
 
+config PINCTRL_OXNAS
+	bool
+	depends on OF
+	select PINMUX
+	select PINCONF
+	select GPIOLIB
+	select OF_GPIO
+	select MFD_SYSCON
+
 config PINCTRL_ROCKCHIP
 	bool
 	select PINMUX
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index bf1b5ca..3351d10 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -17,6 +17,7 @@  obj-$(CONFIG_PINCTRL_AMD)	+= pinctrl-amd.o
 obj-$(CONFIG_PINCTRL_DIGICOLOR)	+= pinctrl-digicolor.o
 obj-$(CONFIG_PINCTRL_FALCON)	+= pinctrl-falcon.o
 obj-$(CONFIG_PINCTRL_MESON)	+= meson/
+obj-$(CONFIG_PINCTRL_OXNAS)	+= pinctrl-oxnas.o
 obj-$(CONFIG_PINCTRL_PALMAS)	+= pinctrl-palmas.o
 obj-$(CONFIG_PINCTRL_PISTACHIO)	+= pinctrl-pistachio.o
 obj-$(CONFIG_PINCTRL_ROCKCHIP)	+= pinctrl-rockchip.o
diff --git a/drivers/pinctrl/pinctrl-oxnas.c b/drivers/pinctrl/pinctrl-oxnas.c
new file mode 100644
index 0000000..5dfd3a9
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-oxnas.c
@@ -0,0 +1,1393 @@ 
+/*
+ * PLX Technology OXNAS Pinctrl driver based on at91 pinctrl driver
+ *
+ * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
+ * Copyright (C) 2013 Ma Hajun <mahaijuns@gmail.com>
+ * Copyright (C) 2011 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/pinctrl/machine.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinmux.h>
+/* Since we request GPIOs from ourself */
+#include <linux/pinctrl/consumer.h>
+#include <linux/version.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+#include "core.h"
+
+#define MAX_NB_GPIO_PER_BANK	32
+#define MAX_GPIO_BANKS		2
+
+struct oxnas_gpio_chip {
+	struct gpio_chip	chip;
+	struct pinctrl_gpio_range range;
+	void __iomem		*regbase;  /* GPIOA/B virtual address */
+	struct irq_domain	*domain;   /* associated irq domain */
+	struct regmap		*regmap;
+};
+
+#define to_oxnas_gpio_chip(c) container_of(c, struct oxnas_gpio_chip, chip)
+
+static struct oxnas_gpio_chip *gpio_chips[MAX_GPIO_BANKS];
+
+static int gpio_banks;
+
+/**
+ * struct oxnas_pmx_func - describes pinmux functions
+ * @name: the name of this specific function
+ * @groups: corresponding pin groups
+ * @ngroups: the number of groups
+ */
+struct oxnas_pmx_func {
+	const char	*name;
+	const char	**groups;
+	unsigned	ngroups;
+};
+
+enum oxnas_mux {
+	OXNAS_PINMUX_GPIO,
+	OXNAS_PINMUX_FUNC1,
+	OXNAS_PINMUX_FUNC2,
+	OXNAS_PINMUX_FUNC3,
+};
+
+enum {
+	INPUT_VALUE = 0,
+	OUTPUT_ENABLE = 4,
+	IRQ_PENDING = 0xC,
+	OUTPUT_VALUE = 0x10,
+	OUTPUT_SET = 0x14,
+	OUTPUT_CLEAR = 0x18,
+	OUTPUT_EN_SET = 0x1C,
+	OUTPUT_EN_CLEAR = 0x20,
+	RE_IRQ_ENABLE = 0x28, /* rising edge */
+	FE_IRQ_ENABLE = 0x2C, /* falling edge */
+	RE_IRQ_PENDING = 0x30, /* rising edge */
+	FE_IRQ_PENDING = 0x34, /* falling edge */
+};
+
+enum {
+	PINMUX_PRIMARY_SEL0 = 0x0c,
+	PINMUX_PRIMARY_SEL1 = 0x10,
+	PINMUX_SECONDARY_SEL0 = 0x14,
+	PINMUX_SECONDARY_SEL1 = 0x18,
+	PINMUX_TERTIARY_SEL0 = 0x8c,
+	PINMUX_TERTIARY_SEL1 = 0x90,
+};
+
+/**
+ * struct oxnas_pmx_pin - describes an pin mux
+ * @bank: the bank of the pin
+ * @pin: the pin number in the @bank
+ * @mux: the mux mode : gpio or periph_x of the pin i.e. alternate function.
+ * @conf: the configuration of the pin: PULL_UP, MULTIDRIVE etc...
+ */
+struct oxnas_pmx_pin {
+	uint32_t	bank;
+	uint32_t	pin;
+	enum oxnas_mux	mux;
+	unsigned long	conf;
+};
+
+/**
+ * struct oxnas_pin_group - describes an pin group
+ * @name: the name of this specific pin group
+ * @pins_conf: the mux mode for each pin in this group. The size of this
+ *	array is the same as pins.
+ * @pins: an array of discrete physical pins used in this group, taken
+ *	from the driver-local pin enumeration space
+ * @npins: the number of pins in this group array, i.e. the number of
+ *	elements in .pins so we can iterate over that array
+ */
+struct oxnas_pin_group {
+	const char		*name;
+	struct oxnas_pmx_pin	*pins_conf;
+	unsigned int		*pins;
+	unsigned		npins;
+};
+
+struct oxnas_pinctrl {
+	struct device		*dev;
+	struct pinctrl_dev	*pctl;
+	struct regmap		*regmap;
+
+	int			nbanks;
+
+	uint32_t		*mux_mask;
+	int			nmux;
+
+	struct oxnas_pmx_func	*functions;
+	int			nfunctions;
+
+	struct oxnas_pin_group	*groups;
+	int			ngroups;
+};
+
+static const inline struct oxnas_pin_group *oxnas_pinctrl_find_group_by_name(
+				const struct oxnas_pinctrl *info,
+				const char *name)
+{
+	const struct oxnas_pin_group *grp = NULL;
+	int i;
+
+	for (i = 0; i < info->ngroups; i++) {
+		if (strcmp(info->groups[i].name, name))
+			continue;
+
+		grp = &info->groups[i];
+		dev_dbg(info->dev, "%s: %d 0:%d\n", name, grp->npins,
+			grp->pins[0]);
+		break;
+	}
+
+	return grp;
+}
+
+static int oxnas_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	struct oxnas_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	return info->ngroups;
+}
+
+static const char *oxnas_get_group_name(struct pinctrl_dev *pctldev,
+				       unsigned selector)
+{
+	struct oxnas_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	return info->groups[selector].name;
+}
+
+static int oxnas_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
+			       const unsigned **pins,
+			       unsigned *npins)
+{
+	struct oxnas_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	if (selector >= info->ngroups)
+		return -EINVAL;
+
+	*pins = info->groups[selector].pins;
+	*npins = info->groups[selector].npins;
+
+	return 0;
+}
+
+static void oxnas_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
+		   unsigned offset)
+{
+	seq_printf(s, "%s", dev_name(pctldev->dev));
+}
+
+static int oxnas_dt_node_to_map(struct pinctrl_dev *pctldev,
+			struct device_node *np,
+			struct pinctrl_map **map, unsigned *num_maps)
+{
+	struct oxnas_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	const struct oxnas_pin_group *grp;
+	struct pinctrl_map *new_map;
+	struct device_node *parent;
+	int map_num = 1;
+	int i;
+
+	/*
+	 * first find the group of this node and check if we need create
+	 * config maps for pins
+	 */
+	grp = oxnas_pinctrl_find_group_by_name(info, np->name);
+	if (!grp) {
+		dev_err(info->dev, "unable to find group for node %s\n",
+			np->name);
+		return -EINVAL;
+	}
+
+	map_num += grp->npins;
+	new_map = devm_kzalloc(pctldev->dev, sizeof(*new_map) * map_num,
+			       GFP_KERNEL);
+	if (!new_map)
+		return -ENOMEM;
+
+	*map = new_map;
+	*num_maps = map_num;
+
+	/* create mux map */
+	parent = of_get_parent(np);
+	if (!parent) {
+		devm_kfree(pctldev->dev, new_map);
+		return -EINVAL;
+	}
+	new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
+	new_map[0].data.mux.function = parent->name;
+	new_map[0].data.mux.group = np->name;
+	of_node_put(parent);
+
+	/* create config map */
+	new_map++;
+	for (i = 0; i < grp->npins; i++) {
+		new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
+		new_map[i].data.configs.group_or_pin =
+				pin_get_name(pctldev, grp->pins[i]);
+		new_map[i].data.configs.configs = &grp->pins_conf[i].conf;
+		new_map[i].data.configs.num_configs = 1;
+	}
+
+	dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
+		(*map)->data.mux.function, (*map)->data.mux.group, map_num);
+
+	return 0;
+}
+
+static void oxnas_dt_free_map(struct pinctrl_dev *pctldev,
+				struct pinctrl_map *map, unsigned num_maps)
+{
+}
+
+static const struct pinctrl_ops oxnas_pctrl_ops = {
+	.get_groups_count	= oxnas_get_groups_count,
+	.get_group_name		= oxnas_get_group_name,
+	.get_group_pins		= oxnas_get_group_pins,
+	.pin_dbg_show		= oxnas_pin_dbg_show,
+	.dt_node_to_map		= oxnas_dt_node_to_map,
+	.dt_free_map		= oxnas_dt_free_map,
+};
+
+static void __iomem *pin_to_gpioctrl(struct oxnas_pinctrl *info,
+				 unsigned int bank)
+{
+	return gpio_chips[bank]->regbase;
+}
+
+static inline int pin_to_bank(unsigned pin)
+{
+	return pin / MAX_NB_GPIO_PER_BANK;
+}
+
+static unsigned pin_to_mask(unsigned int pin)
+{
+	return 1 << pin;
+}
+
+static void oxnas_mux_disable_interrupt(void __iomem *pio, unsigned mask)
+{
+	writel(readl(pio + RE_IRQ_ENABLE) & ~mask, pio + RE_IRQ_ENABLE);
+	writel(readl(pio + FE_IRQ_ENABLE) & ~mask, pio + FE_IRQ_ENABLE);
+}
+
+static void oxnas_mux_set_func1(struct oxnas_pinctrl *ctrl,
+				unsigned bank, unsigned mask)
+{
+	if (!bank) {
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_PRIMARY_SEL0, mask, mask);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_SECONDARY_SEL0, mask, 0);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_TERTIARY_SEL1, mask, 0);
+	} else {
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_PRIMARY_SEL1, mask, mask);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_SECONDARY_SEL1, mask, 0);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_TERTIARY_SEL1, mask, 0);
+	}
+}
+
+static void oxnas_mux_set_func2(struct oxnas_pinctrl *ctrl,
+				unsigned bank, unsigned mask)
+{
+	if (!bank) {
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_PRIMARY_SEL0, mask, 0);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_SECONDARY_SEL0, mask, mask);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_TERTIARY_SEL0, mask, 0);
+	} else {
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_PRIMARY_SEL1, mask, 0);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_SECONDARY_SEL1, mask, mask);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_TERTIARY_SEL1, mask, 0);
+	}
+}
+
+static void oxnas_mux_set_func3(struct oxnas_pinctrl *ctrl,
+				unsigned bank, unsigned mask)
+{
+	if (!bank) {
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_PRIMARY_SEL0, mask, 0);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_SECONDARY_SEL0, mask, 0);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_TERTIARY_SEL0, mask, mask);
+	} else {
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_PRIMARY_SEL1, mask, 0);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_SECONDARY_SEL1, mask, 0);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_TERTIARY_SEL1, mask, mask);
+	}
+}
+
+static void oxnas_mux_set_gpio(struct oxnas_pinctrl *ctrl,
+			       unsigned bank, unsigned mask)
+{
+	if (!bank) {
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_PRIMARY_SEL0, mask, 0);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_SECONDARY_SEL0, mask, 0);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_TERTIARY_SEL0, mask, 0);
+	} else {
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_PRIMARY_SEL1, mask, 0);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_SECONDARY_SEL1, mask, 0);
+		regmap_write_bits(ctrl->regmap,
+				PINMUX_TERTIARY_SEL1, mask, 0);
+	}
+}
+
+static enum oxnas_mux oxnas_mux_get_func(struct regmap *regmap,
+					 unsigned bank, unsigned mask)
+{
+	unsigned int val;
+
+	if (!bank) {
+		if (!regmap_read(regmap, PINMUX_PRIMARY_SEL0, &val) &&
+		    (val & mask))
+			return OXNAS_PINMUX_FUNC1;
+		if (!regmap_read(regmap, PINMUX_SECONDARY_SEL0, &val) &&
+		    (val & mask))
+			return OXNAS_PINMUX_FUNC2;
+		if (!regmap_read(regmap, PINMUX_TERTIARY_SEL0, &val) &&
+		    (val & mask))
+			return OXNAS_PINMUX_FUNC3;
+	} else {
+		if (!regmap_read(regmap, PINMUX_PRIMARY_SEL1, &val) &&
+		    (val & mask))
+			return OXNAS_PINMUX_FUNC1;
+		if (!regmap_read(regmap, PINMUX_SECONDARY_SEL1, &val) &&
+		    (val & mask))
+			return OXNAS_PINMUX_FUNC2;
+		if (!regmap_read(regmap, PINMUX_TERTIARY_SEL1, &val) &&
+		    (val & mask))
+			return OXNAS_PINMUX_FUNC3;
+	}
+
+	return OXNAS_PINMUX_GPIO;
+}
+
+static void oxnas_pin_dbg(const struct device *dev,
+			  const struct oxnas_pmx_pin *pin)
+{
+	if (pin->mux) {
+		dev_dbg(dev,
+			"MF_%c%d configured as periph%c with conf = %lu\n",
+			pin->bank + 'A', pin->pin, pin->mux - 1 + 'A',
+			pin->conf);
+	} else {
+		dev_dbg(dev, "MF_%c%d configured as gpio with conf = %lu\n",
+			pin->bank + 'A', pin->pin, pin->conf);
+	}
+}
+
+static int pin_check_config(struct oxnas_pinctrl *info, const char *name,
+			    int index, const struct oxnas_pmx_pin *pin)
+{
+	int mux;
+
+	/* check if it's a valid config */
+	if (pin->bank >= info->nbanks) {
+		dev_err(info->dev, "%s: pin conf %d bank_id %d >= nbanks %d\n",
+			name, index, pin->bank, info->nbanks);
+		return -EINVAL;
+	}
+
+	if (pin->pin >= MAX_NB_GPIO_PER_BANK) {
+		dev_err(info->dev, "%s: pin conf %d pin_bank_id %d >= %d\n",
+			name, index, pin->pin, MAX_NB_GPIO_PER_BANK);
+		return -EINVAL;
+	}
+	/* gpio always allowed */
+	if (!pin->mux)
+		return 0;
+
+	mux = pin->mux - 1;
+
+	if (mux >= info->nmux) {
+		dev_err(info->dev, "%s: pin conf %d mux_id %d >= nmux %d\n",
+			name, index, mux, info->nmux);
+		return -EINVAL;
+	}
+
+	if (!(info->mux_mask[pin->bank * info->nmux + mux] & 1 << pin->pin)) {
+		dev_err(info->dev, "%s: pin conf %d mux_id %d not supported for MF_%c%d\n",
+			name, index, mux, pin->bank + 'A', pin->pin);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void oxnas_mux_gpio_enable(struct oxnas_pinctrl *ctrl,
+				  int bank,
+				  void __iomem *pio,
+				  unsigned mask, bool input)
+{
+	oxnas_mux_set_gpio(ctrl, bank, mask);
+
+	if (input)
+		writel_relaxed(mask, pio + OUTPUT_EN_CLEAR);
+	else
+		writel_relaxed(mask, pio + OUTPUT_EN_SET);
+}
+
+static void oxnas_mux_gpio_disable(struct oxnas_pinctrl *ctrl,
+				   int bank,
+				   unsigned mask)
+{
+	/* when switch to other function, gpio is disabled automatically */
+}
+
+static int oxnas_pmx_set_mux(struct pinctrl_dev *pctldev, unsigned selector,
+			    unsigned group)
+{
+	struct oxnas_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+	const struct oxnas_pmx_pin *pins_conf = info->groups[group].pins_conf;
+	const struct oxnas_pmx_pin *pin;
+	uint32_t npins = info->groups[group].npins;
+	int i, ret;
+	unsigned mask;
+	void __iomem *pio;
+
+	dev_dbg(info->dev, "enable function %s group %s\n",
+		info->functions[selector].name, info->groups[group].name);
+
+	/* first check that all the pins of the group are valid with a valid
+	 * parameter
+	 */
+	for (i = 0; i < npins; i++) {
+		pin = &pins_conf[i];
+		ret = pin_check_config(info, info->groups[group].name, i, pin);
+		if (ret)
+			return ret;
+	}
+
+	for (i = 0; i < npins; i++) {
+		pin = &pins_conf[i];
+		oxnas_pin_dbg(info->dev, pin);
+
+		pio = pin_to_gpioctrl(info, pin->bank);
+
+		mask = pin_to_mask(pin->pin);
+		oxnas_mux_disable_interrupt(pio, mask);
+
+		switch (pin->mux) {
+		case OXNAS_PINMUX_GPIO:
+			oxnas_mux_gpio_enable(info, pin->bank, pio, mask, 1);
+			break;
+		case OXNAS_PINMUX_FUNC1:
+			oxnas_mux_set_func1(info, pin->bank, mask);
+			break;
+		case OXNAS_PINMUX_FUNC2:
+			oxnas_mux_set_func2(info, pin->bank, mask);
+			break;
+		case OXNAS_PINMUX_FUNC3:
+			oxnas_mux_set_func3(info, pin->bank, mask);
+			break;
+		}
+		if (pin->mux)
+			oxnas_mux_gpio_disable(info, pin->bank, mask);
+	}
+
+	return 0;
+}
+
+static int oxnas_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
+{
+	struct oxnas_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	return info->nfunctions;
+}
+
+static const char *oxnas_pmx_get_func_name(struct pinctrl_dev *pctldev,
+					   unsigned selector)
+{
+	struct oxnas_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	return info->functions[selector].name;
+}
+
+static int oxnas_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
+				const char * const **groups,
+				unsigned * const num_groups)
+{
+	struct oxnas_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+
+	*groups = info->functions[selector].groups;
+	*num_groups = info->functions[selector].ngroups;
+
+	return 0;
+}
+
+static int oxnas_gpio_request_enable(struct pinctrl_dev *pctldev,
+				     struct pinctrl_gpio_range *range,
+				     unsigned offset)
+{
+	struct oxnas_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
+	struct oxnas_gpio_chip *oxnas_chip;
+	struct gpio_chip *chip;
+	unsigned mask;
+
+	if (!range) {
+		dev_err(npct->dev, "invalid range\n");
+		return -EINVAL;
+	}
+	if (!range->gc) {
+		dev_err(npct->dev, "missing GPIO chip in range\n");
+		return -EINVAL;
+	}
+	chip = range->gc;
+	oxnas_chip = container_of(chip, struct oxnas_gpio_chip, chip);
+
+	dev_dbg(npct->dev, "enable pin %u as GPIO\n", offset);
+
+	mask = 1 << (offset - chip->base);
+
+	dev_dbg(npct->dev, "enable pin %u as MF_%c%d 0x%x\n",
+		offset, 'A' + range->id, offset - chip->base, mask);
+
+	oxnas_mux_set_gpio(npct, range->id, mask);
+
+	return 0;
+}
+
+static void oxnas_gpio_disable_free(struct pinctrl_dev *pctldev,
+				    struct pinctrl_gpio_range *range,
+				    unsigned offset)
+{
+	struct oxnas_pinctrl *npct = pinctrl_dev_get_drvdata(pctldev);
+
+	dev_dbg(npct->dev, "disable pin %u as GPIO\n", offset);
+
+	/* Set the pin to some default state, GPIO is usually default */
+}
+
+static const struct pinmux_ops oxnas_pmx_ops = {
+	.get_functions_count	= oxnas_pmx_get_funcs_count,
+	.get_function_name	= oxnas_pmx_get_func_name,
+	.get_function_groups	= oxnas_pmx_get_groups,
+	.set_mux		= oxnas_pmx_set_mux,
+	.gpio_request_enable	= oxnas_gpio_request_enable,
+	.gpio_disable_free	= oxnas_gpio_disable_free,
+};
+
+static int oxnas_pinconf_get(struct pinctrl_dev *pctldev,
+			     unsigned pin_id, unsigned long *config)
+{
+	/* Nothing yet */
+
+	return 0;
+}
+
+static int oxnas_pinconf_set(struct pinctrl_dev *pctldev,
+			     unsigned pin_id, unsigned long *configs,
+			     unsigned num_configs)
+{
+	/* Nothing yet */
+
+	return 0;
+}
+
+static void oxnas_pinconf_dbg_show(struct pinctrl_dev *pctldev,
+				   struct seq_file *s, unsigned pin_id)
+{
+
+}
+
+static void oxnas_pinconf_group_dbg_show(struct pinctrl_dev *pctldev,
+					 struct seq_file *s, unsigned group)
+{
+}
+
+static const struct pinconf_ops oxnas_pinconf_ops = {
+	.pin_config_get			= oxnas_pinconf_get,
+	.pin_config_set			= oxnas_pinconf_set,
+	.pin_config_dbg_show		= oxnas_pinconf_dbg_show,
+	.pin_config_group_dbg_show	= oxnas_pinconf_group_dbg_show,
+};
+
+static struct pinctrl_desc oxnas_pinctrl_desc = {
+	.pctlops	= &oxnas_pctrl_ops,
+	.pmxops		= &oxnas_pmx_ops,
+	.confops	= &oxnas_pinconf_ops,
+	.owner		= THIS_MODULE,
+};
+
+static const char *gpio_compat = "plxtech,nas782x-gpio";
+
+static void oxnas_pinctrl_child_count(struct oxnas_pinctrl *info,
+				      struct device_node *np)
+{
+	struct device_node *child;
+
+	for_each_child_of_node(np, child) {
+		if (of_device_is_compatible(child, gpio_compat)) {
+			info->nbanks++;
+		} else {
+			info->nfunctions++;
+			info->ngroups += of_get_child_count(child);
+		}
+	}
+}
+
+static int oxnas_pinctrl_mux_mask(struct oxnas_pinctrl *info,
+				  struct device_node *np)
+{
+	int ret = 0;
+	int size;
+	const __be32 *list;
+
+	list = of_get_property(np, "plxtech,mux-mask", &size);
+	if (!list) {
+		dev_err(info->dev, "can not read the mux-mask of %d\n", size);
+		return -EINVAL;
+	}
+
+	size /= sizeof(*list);
+	if (!size || size % info->nbanks) {
+		dev_err(info->dev, "wrong mux mask array should be by %d\n",
+			info->nbanks);
+		return -EINVAL;
+	}
+	info->nmux = size / info->nbanks;
+
+	info->mux_mask = devm_kzalloc(info->dev, sizeof(u32) * size,
+				      GFP_KERNEL);
+	if (!info->mux_mask)
+		return -ENOMEM;
+
+	ret = of_property_read_u32_array(np, "plxtech,mux-mask",
+					  info->mux_mask, size);
+	if (ret)
+		dev_err(info->dev, "can not read the mux-mask of %d\n", size);
+	return ret;
+}
+
+static int oxnas_pinctrl_parse_groups(struct device_node *np,
+				      struct oxnas_pin_group *grp,
+				      struct oxnas_pinctrl *info, u32 index)
+{
+	struct oxnas_pmx_pin *pin;
+	int size;
+	const __be32 *list;
+	int i, j;
+
+	dev_dbg(info->dev, "group(%d): %s\n", index, np->name);
+
+	/* Initialise group */
+	grp->name = np->name;
+
+	/*
+	 * the binding format is plxtech,pins = <bank pin mux CONFIG ...>,
+	 * do sanity check and calculate pins number
+	 */
+	list = of_get_property(np, "plxtech,pins", &size);
+	/* we do not check return since it's safe node passed down */
+	size /= sizeof(*list);
+	if (!size || size % 4) {
+		dev_err(info->dev, "wrong pins number or pins and configs should be divisible by 4\n");
+		return -EINVAL;
+	}
+
+	grp->npins = size / 4;
+	pin = grp->pins_conf = devm_kzalloc(info->dev,
+				grp->npins * sizeof(struct oxnas_pmx_pin),
+				GFP_KERNEL);
+	grp->pins = devm_kzalloc(info->dev, grp->npins * sizeof(unsigned int),
+				GFP_KERNEL);
+	if (!grp->pins_conf || !grp->pins)
+		return -ENOMEM;
+
+	for (i = 0, j = 0; i < size; i += 4, j++) {
+		pin->bank = be32_to_cpu(*list++);
+		pin->pin = be32_to_cpu(*list++);
+		grp->pins[j] = pin->bank * MAX_NB_GPIO_PER_BANK + pin->pin;
+		pin->mux = be32_to_cpu(*list++);
+		pin->conf = be32_to_cpu(*list++);
+
+		oxnas_pin_dbg(info->dev, pin);
+		pin++;
+	}
+
+	return 0;
+}
+
+static int oxnas_pinctrl_parse_functions(struct device_node *np,
+					struct oxnas_pinctrl *info, u32 index)
+{
+	struct device_node *child;
+	struct oxnas_pmx_func *func;
+	struct oxnas_pin_group *grp;
+	int ret;
+	static u32 grp_index;
+	u32 i = 0;
+
+	dev_dbg(info->dev, "parse function(%d): %s\n", index, np->name);
+
+	func = &info->functions[index];
+
+	/* Initialise function */
+	func->name = np->name;
+	func->ngroups = of_get_child_count(np);
+	if (func->ngroups <= 0) {
+		dev_err(info->dev, "no groups defined\n");
+		return -EINVAL;
+	}
+	func->groups = devm_kzalloc(info->dev,
+			func->ngroups * sizeof(char *), GFP_KERNEL);
+	if (!func->groups)
+		return -ENOMEM;
+
+	for_each_child_of_node(np, child) {
+		func->groups[i] = child->name;
+		grp = &info->groups[grp_index++];
+		ret = oxnas_pinctrl_parse_groups(child, grp, info, i++);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id oxnas_pinctrl_of_match[] = {
+	{ .compatible = "plxtech,nas782x-pinctrl"},
+	{ .compatible = "plxtech,ox810se-pinctrl"},
+	{ /* sentinel */ }
+};
+
+static int oxnas_pinctrl_probe_dt(struct platform_device *pdev,
+				 struct oxnas_pinctrl *info)
+{
+	int ret = 0;
+	int i, j;
+	uint32_t *tmp;
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *child;
+
+	if (!np)
+		return -ENODEV;
+
+	info->dev = &pdev->dev;
+
+	oxnas_pinctrl_child_count(info, np);
+
+	if (info->nbanks < 1) {
+		dev_err(&pdev->dev, "you need to specify atleast one gpio-controller\n");
+		return -EINVAL;
+	}
+
+	ret = oxnas_pinctrl_mux_mask(info, np);
+	if (ret)
+		return ret;
+
+	dev_dbg(&pdev->dev, "nmux = %d\n", info->nmux);
+
+	dev_dbg(&pdev->dev, "mux-mask\n");
+	tmp = info->mux_mask;
+	for (i = 0; i < info->nbanks; i++)
+		for (j = 0; j < info->nmux; j++, tmp++)
+			dev_dbg(&pdev->dev, "%d:%d\t0x%x\n", i, j, tmp[0]);
+
+	dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
+	dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
+	info->functions = devm_kzalloc(&pdev->dev, info->nfunctions *
+						sizeof(struct oxnas_pmx_func),
+					GFP_KERNEL);
+	if (!info->functions)
+		return -ENOMEM;
+
+	info->groups = devm_kzalloc(&pdev->dev, info->ngroups *
+					sizeof(struct oxnas_pin_group),
+				    GFP_KERNEL);
+	if (!info->groups)
+		return -ENOMEM;
+
+	dev_dbg(&pdev->dev, "nbanks = %d\n", info->nbanks);
+	dev_dbg(&pdev->dev, "nfunctions = %d\n", info->nfunctions);
+	dev_dbg(&pdev->dev, "ngroups = %d\n", info->ngroups);
+
+	i = 0;
+
+	for_each_child_of_node(np, child) {
+		if (of_device_is_compatible(child, gpio_compat))
+			continue;
+		ret = oxnas_pinctrl_parse_functions(child, info, i++);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to parse function\n");
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int oxnas_pinctrl_probe(struct platform_device *pdev)
+{
+	struct oxnas_pinctrl *info;
+	struct pinctrl_pin_desc *pdesc;
+	int ret, i, j, k;
+
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	info->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+						       "plxtech,sys-ctrl");
+	if (IS_ERR(info->regmap)) {
+		dev_err(&pdev->dev, "failed to get sys ctrl regmap\n");
+		return -ENODEV;
+	}
+
+	ret = oxnas_pinctrl_probe_dt(pdev, info);
+	if (ret)
+		return ret;
+
+	/*
+	 * We need all the GPIO drivers to probe FIRST, or we will not be able
+	 * to obtain references to the struct gpio_chip * for them, and we
+	 * need this to proceed.
+	 */
+	for (i = 0; i < info->nbanks; i++) {
+		if (!gpio_chips[i]) {
+			dev_warn(&pdev->dev,
+				 "GPIO chip %d not registered yet\n", i);
+			devm_kfree(&pdev->dev, info);
+			return -EPROBE_DEFER;
+		}
+	}
+
+	oxnas_pinctrl_desc.name = dev_name(&pdev->dev);
+	oxnas_pinctrl_desc.npins = info->nbanks * MAX_NB_GPIO_PER_BANK;
+	oxnas_pinctrl_desc.pins = pdesc =
+		devm_kzalloc(&pdev->dev, sizeof(*pdesc) *
+				oxnas_pinctrl_desc.npins, GFP_KERNEL);
+
+	if (!oxnas_pinctrl_desc.pins)
+		return -ENOMEM;
+
+	for (i = 0, k = 0; i < info->nbanks; i++) {
+		for (j = 0; j < MAX_NB_GPIO_PER_BANK; j++, k++) {
+			pdesc->number = k;
+			pdesc->name = kasprintf(GFP_KERNEL, "MF_%c%d", i + 'A',
+						j);
+			pdesc++;
+		}
+	}
+
+	platform_set_drvdata(pdev, info);
+	info->pctl = pinctrl_register(&oxnas_pinctrl_desc, &pdev->dev, info);
+
+	if (!info->pctl) {
+		dev_err(&pdev->dev, "could not register OXNAS pinctrl driver\n");
+		ret = -EINVAL;
+		goto err;
+	}
+
+	/* We will handle a range of GPIO pins */
+	for (i = 0; i < info->nbanks; i++)
+		pinctrl_add_gpio_range(info->pctl, &gpio_chips[i]->range);
+
+	dev_info(&pdev->dev, "initialized OXNAS pinctrl driver\n");
+
+	return 0;
+
+err:
+	return ret;
+}
+
+static int oxnas_pinctrl_remove(struct platform_device *pdev)
+{
+	struct oxnas_pinctrl *info = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(info->pctl);
+
+	return 0;
+}
+
+static int oxnas_gpio_request(struct gpio_chip *chip, unsigned offset)
+{
+	/*
+	 * Map back to global GPIO space and request muxing, the direction
+	 * parameter does not matter for this controller.
+	 */
+	int gpio = chip->base + offset;
+	int bank = chip->base / chip->ngpio;
+
+	dev_dbg(chip->parent, "%s:%d MF_%c%d(%d)\n", __func__, __LINE__,
+		'A' + bank, offset, gpio);
+
+	return pinctrl_request_gpio(gpio);
+}
+
+static void oxnas_gpio_free(struct gpio_chip *chip, unsigned offset)
+{
+	int gpio = chip->base + offset;
+
+	pinctrl_free_gpio(gpio);
+}
+
+static int oxnas_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+	struct oxnas_gpio_chip *oxnas_gpio = to_oxnas_gpio_chip(chip);
+	void __iomem *pio = oxnas_gpio->regbase;
+
+	writel_relaxed(BIT(offset), pio + OUTPUT_EN_CLEAR);
+	return 0;
+}
+
+static int oxnas_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+	struct oxnas_gpio_chip *oxnas_gpio = to_oxnas_gpio_chip(chip);
+	void __iomem *pio = oxnas_gpio->regbase;
+	unsigned mask = 1 << offset;
+	u32 pdsr = 0;
+
+	pdsr = readl_relaxed(pio + INPUT_VALUE);
+	return (pdsr & mask) != 0;
+}
+
+static void oxnas_gpio_set(struct gpio_chip *chip, unsigned offset,
+				int val)
+{
+	struct oxnas_gpio_chip *oxnas_gpio = to_oxnas_gpio_chip(chip);
+	void __iomem *pio = oxnas_gpio->regbase;
+
+	if (val)
+		writel_relaxed(BIT(offset), pio + OUTPUT_SET);
+	else
+		writel_relaxed(BIT(offset), pio + OUTPUT_CLEAR);
+}
+
+static int oxnas_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
+				int val)
+{
+	struct oxnas_gpio_chip *oxnas_gpio = to_oxnas_gpio_chip(chip);
+	void __iomem *pio = oxnas_gpio->regbase;
+
+	if (val)
+		writel_relaxed(BIT(offset), pio + OUTPUT_SET);
+	else
+		writel_relaxed(BIT(offset), pio + OUTPUT_CLEAR);
+
+	writel_relaxed(BIT(offset), pio + OUTPUT_EN_SET);
+
+	return 0;
+}
+
+static int oxnas_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+	struct oxnas_gpio_chip *oxnas_gpio = to_oxnas_gpio_chip(chip);
+	int virq;
+
+	if (offset < chip->ngpio)
+		virq = irq_create_mapping(oxnas_gpio->domain, offset);
+	else
+		virq = -ENXIO;
+
+	dev_dbg(chip->parent, "%s: request IRQ for GPIO %d, return %d\n",
+				chip->label, offset + chip->base, virq);
+	return virq;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void oxnas_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+	int i;
+	struct oxnas_gpio_chip *oxnas_gpio = to_oxnas_gpio_chip(chip);
+	void __iomem *pio = oxnas_gpio->regbase;
+	enum oxnas_mux mux;
+
+	for (i = 0; i < chip->ngpio; i++) {
+		unsigned pin = chip->base + i;
+		unsigned mask = pin_to_mask(pin);
+		unsigned bank = pin_to_bank(pin);
+		const char *gpio_label;
+		u32 pdsr;
+
+		gpio_label = gpiochip_is_requested(chip, i);
+		if (gpio_label) {
+			seq_printf(s, "[%s]\tGPIO%s%d: ",
+				   gpio_label, chip->label, i);
+			pdsr = readl_relaxed(pio + INPUT_VALUE);
+
+			seq_printf(s, "[gpio] %s\n",
+					pdsr & mask ?
+					"set" : "clear");
+		} else {
+			mux = oxnas_mux_get_func(oxnas_gpio->regmap,
+						 bank,
+						 mask);
+			seq_printf(s, "\tGPIO%s%d: [func%d]\n",
+				   chip->label, i, mux);
+		}
+
+	}
+}
+#else
+#define oxnas_gpio_dbg_show	NULL
+#endif
+
+/* Several AIC controller irqs are dispatched through this GPIO handler.
+ * To use any AT91_PIN_* as an externally triggered IRQ, first call
+ * oxnas_set_gpio_input() then maybe enable its glitch filter.
+ * Then just request_irq() with the pin ID; it works like any ARM IRQ
+ * handler.
+ */
+
+static void gpio_irq_mask(struct irq_data *d)
+{
+	struct oxnas_gpio_chip *oxnas_gpio = irq_data_get_irq_chip_data(d);
+	void __iomem	*pio = oxnas_gpio->regbase;
+	unsigned	mask = 1 << d->hwirq;
+	unsigned	type = irqd_get_trigger_type(d);
+
+	if (type & IRQ_TYPE_EDGE_RISING)
+		writel(readl(pio + RE_IRQ_ENABLE) & ~mask, pio + RE_IRQ_ENABLE);
+
+	if (type & IRQ_TYPE_EDGE_FALLING)
+		writel(readl(pio + FE_IRQ_ENABLE) & ~mask, pio + FE_IRQ_ENABLE);
+}
+
+static void gpio_irq_unmask(struct irq_data *d)
+{
+	struct oxnas_gpio_chip *oxnas_gpio = irq_data_get_irq_chip_data(d);
+	void __iomem	*pio = oxnas_gpio->regbase;
+	unsigned	mask = 1 << d->hwirq;
+	unsigned	type = irqd_get_trigger_type(d);
+
+	if (type & IRQ_TYPE_EDGE_RISING)
+		writel(readl(pio + RE_IRQ_ENABLE) | mask, pio + RE_IRQ_ENABLE);
+
+	if (type & IRQ_TYPE_EDGE_FALLING)
+		writel(readl(pio + FE_IRQ_ENABLE) | mask, pio + FE_IRQ_ENABLE);
+}
+
+
+static int gpio_irq_type(struct irq_data *d, unsigned type)
+{
+	if ((type & IRQ_TYPE_EDGE_BOTH) == 0) {
+		pr_warn("oxnas: Unsupported type for irq %d\n",
+			gpio_to_irq(d->irq));
+		return -EINVAL;
+	}
+	/* seems no way to set trigger type without enable irq,
+	 * so leave it to unmask time
+	 */
+
+	return 0;
+}
+
+static struct irq_chip gpio_irqchip = {
+	.name		= "GPIO",
+	.irq_disable	= gpio_irq_mask,
+	.irq_mask	= gpio_irq_mask,
+	.irq_unmask	= gpio_irq_unmask,
+	.irq_set_type	= gpio_irq_type,
+};
+
+static void gpio_irq_handler(struct irq_desc *desc)
+{
+	struct irq_chip *chip = irq_desc_get_chip(desc);
+	struct irq_data *idata = irq_desc_get_irq_data(desc);
+	struct oxnas_gpio_chip *oxnas_gpio = irq_data_get_irq_chip_data(idata);
+	void __iomem *pio = oxnas_gpio->regbase;
+	unsigned long isr;
+	int n;
+
+	chained_irq_enter(chip, desc);
+	for (;;) {
+		isr = readl_relaxed(pio + IRQ_PENDING);
+		if (!isr)
+			break;
+
+		/* acks pending interrupts */
+		writel_relaxed(isr, pio + IRQ_PENDING);
+
+		for_each_set_bit(n, &isr, BITS_PER_LONG) {
+			generic_handle_irq(irq_find_mapping(oxnas_gpio->domain,
+							    n));
+		}
+	}
+	chained_irq_exit(chip, desc);
+	/* now it may re-trigger */
+}
+
+/*
+ * This lock class tells lockdep that GPIO irqs are in a different
+ * category than their parents, so it won't report false recursion.
+ */
+static struct lock_class_key gpio_lock_class;
+
+static int oxnas_gpio_irq_map(struct irq_domain *h, unsigned int virq,
+			      irq_hw_number_t hw)
+{
+	struct oxnas_gpio_chip *oxnas_gpio = h->host_data;
+
+	irq_set_lockdep_class(virq, &gpio_lock_class);
+
+	irq_set_chip_and_handler(virq, &gpio_irqchip, handle_edge_irq);
+
+	irq_set_chip_data(virq, oxnas_gpio);
+
+	return 0;
+}
+
+static int oxnas_gpio_irq_domain_xlate(struct irq_domain *d,
+				       struct device_node *ctrlr,
+				       const u32 *intspec,
+				       unsigned int intsize,
+				       irq_hw_number_t *out_hwirq,
+				       unsigned int *out_type)
+{
+	struct oxnas_gpio_chip *oxnas_gpio = d->host_data;
+	int ret;
+	int pin = oxnas_gpio->chip.base + intspec[0];
+
+	if (WARN_ON(intsize < 2))
+		return -EINVAL;
+	*out_hwirq = intspec[0];
+	*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
+
+	ret = gpio_request(pin, ctrlr->full_name);
+	if (ret)
+		return ret;
+
+	ret = gpio_direction_input(pin);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static struct irq_domain_ops oxnas_gpio_ops = {
+	.map	= oxnas_gpio_irq_map,
+	.xlate	= oxnas_gpio_irq_domain_xlate,
+};
+
+static int oxnas_gpio_of_irq_setup(struct device_node *node,
+				   struct oxnas_gpio_chip *oxnas_gpio,
+				   unsigned int irq)
+{
+	/* Disable irqs of this controller */
+	writel_relaxed(0, oxnas_gpio->regbase + RE_IRQ_ENABLE);
+	writel_relaxed(0, oxnas_gpio->regbase + FE_IRQ_ENABLE);
+
+	/* Setup irq domain */
+	oxnas_gpio->domain = irq_domain_add_linear(node, oxnas_gpio->chip.ngpio,
+						   &oxnas_gpio_ops, oxnas_gpio);
+	if (!oxnas_gpio->domain)
+		panic("oxnas_gpio: couldn't allocate irq domain (DT).\n");
+
+	irq_set_chip_data(irq, oxnas_gpio);
+	irq_set_chained_handler(irq, gpio_irq_handler);
+
+	return 0;
+}
+
+/* This structure is replicated for each GPIO block allocated at probe time */
+static struct gpio_chip oxnas_gpio_template = {
+	.request		= oxnas_gpio_request,
+	.free			= oxnas_gpio_free,
+	.direction_input	= oxnas_gpio_direction_input,
+	.get			= oxnas_gpio_get,
+	.direction_output	= oxnas_gpio_direction_output,
+	.set			= oxnas_gpio_set,
+	.to_irq			= oxnas_gpio_to_irq,
+	.dbg_show		= oxnas_gpio_dbg_show,
+	.can_sleep		= 0,
+	.ngpio			= MAX_NB_GPIO_PER_BANK,
+};
+
+static const struct of_device_id oxnas_gpio_of_match[] = {
+	{ .compatible = "plxtech,nas782x-gpio"},
+	{ /* sentinel */ }
+};
+
+static int oxnas_gpio_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct resource *res;
+	struct oxnas_gpio_chip *oxnas_chip = NULL;
+	struct gpio_chip *chip;
+	struct pinctrl_gpio_range *range;
+	struct device_node *node = pdev->dev.of_node;
+	int ret = 0;
+	int irq, i;
+	int alias_idx = of_alias_get_id(np, "gpio");
+	uint32_t ngpio;
+	char **names;
+
+	if (WARN_ON(alias_idx >= ARRAY_SIZE(gpio_chips)))
+		return -EINVAL;
+
+	if (gpio_chips[alias_idx]) {
+		ret = -EBUSY;
+		goto err;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		ret = irq;
+		goto err;
+	}
+
+	oxnas_chip = devm_kzalloc(&pdev->dev, sizeof(*oxnas_chip), GFP_KERNEL);
+	if (!oxnas_chip) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	/* Get pinctrl sys control regmap */
+	oxnas_chip->regmap =
+		syscon_regmap_lookup_by_phandle(of_get_parent(node),
+						"plxtech,sys-ctrl");
+	if (IS_ERR(oxnas_chip->regmap)) {
+		dev_err(&pdev->dev, "failed to get sys ctrl regmap\n");
+		return -ENODEV;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	oxnas_chip->regbase = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(oxnas_chip->regbase)) {
+		ret = PTR_ERR(oxnas_chip->regbase);
+		goto err;
+	}
+
+	oxnas_chip->chip = oxnas_gpio_template;
+
+	chip = &oxnas_chip->chip;
+	chip->of_node = np;
+	chip->label = dev_name(&pdev->dev);
+	chip->parent = &pdev->dev;
+	chip->owner = THIS_MODULE;
+	chip->base = alias_idx * MAX_NB_GPIO_PER_BANK;
+
+	if (!of_property_read_u32(np, "#gpio-lines", &ngpio)) {
+		if (ngpio > MAX_NB_GPIO_PER_BANK)
+			pr_err("oxnas_gpio.%d, gpio-nb >= %d failback to %d\n",
+			       alias_idx, MAX_NB_GPIO_PER_BANK,
+			       MAX_NB_GPIO_PER_BANK);
+		else
+			chip->ngpio = ngpio;
+	}
+
+	names = devm_kzalloc(&pdev->dev, sizeof(char *) * chip->ngpio,
+			     GFP_KERNEL);
+
+	if (!names) {
+		ret = -ENOMEM;
+		goto err;
+	}
+
+	for (i = 0; i < chip->ngpio; i++)
+		names[i] = kasprintf(GFP_KERNEL, "MF_%c%d", alias_idx + 'A', i);
+
+	chip->names = (const char *const *)names;
+
+	range = &oxnas_chip->range;
+	range->name = chip->label;
+	range->id = alias_idx;
+	range->pin_base = range->base = range->id * MAX_NB_GPIO_PER_BANK;
+
+	range->npins = chip->ngpio;
+	range->gc = chip;
+
+	ret = gpiochip_add(chip);
+	if (ret)
+		goto err;
+
+	gpio_chips[alias_idx] = oxnas_chip;
+	gpio_banks = max(gpio_banks, alias_idx + 1);
+
+	oxnas_gpio_of_irq_setup(np, oxnas_chip, irq);
+
+	dev_info(&pdev->dev, "at address %p\n", oxnas_chip->regbase);
+
+	return 0;
+err:
+	dev_err(&pdev->dev, "Failure %i for GPIO %i\n", ret, alias_idx);
+
+	return ret;
+}
+
+static struct platform_driver oxnas_gpio_driver = {
+	.driver = {
+		.name = "gpio-oxnas",
+		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(oxnas_gpio_of_match),
+	},
+	.probe = oxnas_gpio_probe,
+};
+
+static struct platform_driver oxnas_pinctrl_driver = {
+	.driver = {
+		.name = "pinctrl-oxnas",
+		.owner = THIS_MODULE,
+		.of_match_table = of_match_ptr(oxnas_pinctrl_of_match),
+	},
+	.probe = oxnas_pinctrl_probe,
+	.remove = oxnas_pinctrl_remove,
+};
+
+static int __init oxnas_pinctrl_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&oxnas_gpio_driver);
+	if (ret)
+		return ret;
+
+	return platform_driver_register(&oxnas_pinctrl_driver);
+}
+arch_initcall(oxnas_pinctrl_init);
+
+static void __exit oxnas_pinctrl_exit(void)
+{
+	platform_driver_unregister(&oxnas_pinctrl_driver);
+}
+
+module_exit(oxnas_pinctrl_exit);