[v3] gpio: uniphier: add UniPhier GPIO controller driver

Message ID 1503418601-9728-1-git-send-email-yamada.masahiro@socionext.com
State New
Headers show

Commit Message

Masahiro Yamada Aug. 22, 2017, 4:16 p.m.
This GPIO controller device is used on UniPhier SoCs.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Changes in v3:
  - Add .irq_set_affinity() hook
  - Use irq_domain_create_hierarchy() instead of legacy
    irq_domain_add_hierarchy().

Changes in v2:
  - Remove +32 offset for parent interrupts to follow the GIC
    binding convention
  - Let uniphier_gpio_irq_alloc() fail if nr_irqs != 1
  - Allocate gpio_chip statically because just one instance is
    supported
  - Fix suspend and resume hooks

 .../devicetree/bindings/gpio/gpio-uniphier.txt     |  42 ++
 MAINTAINERS                                        |   1 +
 drivers/gpio/Kconfig                               |   7 +
 drivers/gpio/Makefile                              |   1 +
 drivers/gpio/gpio-uniphier.c                       | 589 +++++++++++++++++++++
 include/dt-bindings/gpio/uniphier-gpio.h           |  18 +
 6 files changed, 658 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/gpio-uniphier.txt
 create mode 100644 drivers/gpio/gpio-uniphier.c
 create mode 100644 include/dt-bindings/gpio/uniphier-gpio.h

Comments

Rob Herring Aug. 25, 2017, 9:39 p.m. | #1
On Wed, Aug 23, 2017 at 01:16:41AM +0900, Masahiro Yamada wrote:
> This GPIO controller device is used on UniPhier SoCs.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---
> 
> Changes in v3:
>   - Add .irq_set_affinity() hook
>   - Use irq_domain_create_hierarchy() instead of legacy
>     irq_domain_add_hierarchy().
> 
> Changes in v2:
>   - Remove +32 offset for parent interrupts to follow the GIC
>     binding convention
>   - Let uniphier_gpio_irq_alloc() fail if nr_irqs != 1
>   - Allocate gpio_chip statically because just one instance is
>     supported
>   - Fix suspend and resume hooks
> 
>  .../devicetree/bindings/gpio/gpio-uniphier.txt     |  42 ++

Acked-by: Rob Herring <robh@kernel.org>

>  MAINTAINERS                                        |   1 +
>  drivers/gpio/Kconfig                               |   7 +
>  drivers/gpio/Makefile                              |   1 +
>  drivers/gpio/gpio-uniphier.c                       | 589 +++++++++++++++++++++
>  include/dt-bindings/gpio/uniphier-gpio.h           |  18 +
>  6 files changed, 658 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/gpio/gpio-uniphier.txt
>  create mode 100644 drivers/gpio/gpio-uniphier.c
>  create mode 100644 include/dt-bindings/gpio/uniphier-gpio.h
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Linus Walleij Aug. 31, 2017, 1:41 p.m. | #2
On Tue, Aug 22, 2017 at 6:16 PM, Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:

> This GPIO controller device is used on UniPhier SoCs.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---
>
> Changes in v3:
>   - Add .irq_set_affinity() hook
>   - Use irq_domain_create_hierarchy() instead of legacy
>     irq_domain_add_hierarchy().

This is getting better and better.

> +static const u32 uniphier_gpio_irq_parent_hwirqs[] = {
> +       48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
> +       154, 155, 156, 157, 158, 217, 218, 219,
> +};

This array which is used when allocating the hierarchical domain
looks like configuration data. Why is it not in the device tree?

Yours,
Linus Walleij
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Masahiro Yamada Aug. 31, 2017, 3:36 p.m. | #3
Hi Linus,


2017-08-31 22:41 GMT+09:00 Linus Walleij <linus.walleij@linaro.org>:
> On Tue, Aug 22, 2017 at 6:16 PM, Masahiro Yamada
> <yamada.masahiro@socionext.com> wrote:
>
>> This GPIO controller device is used on UniPhier SoCs.
>>
>> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
>> ---
>>
>> Changes in v3:
>>   - Add .irq_set_affinity() hook
>>   - Use irq_domain_create_hierarchy() instead of legacy
>>     irq_domain_add_hierarchy().
>
> This is getting better and better.
>
>> +static const u32 uniphier_gpio_irq_parent_hwirqs[] = {
>> +       48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
>> +       154, 155, 156, 157, 158, 217, 218, 219,
>> +};
>
> This array which is used when allocating the hierarchical domain
> looks like configuration data. Why is it not in the device tree?


The same comment as in v1.

There is no systematic way to map hwirqs to the parent
for irqdomain hierarchy:
https://lkml.org/lkml/2017/7/6/758



If you see irqchip drivers using domain hierarchy,
many drivers hard-code

    parent_fwspec.param_count = 3;

without parsing #interrupt-cells property of the parent.

It is hard-coded configuration data, isn't it?



The array of parent hwirqs is more or less SoC specific data.


This is just a matter of taste, but
if you like, I can move the array to the SoC data associated
with compatible.


.ngpio is already associated with compatible,
so adding more data would not hurt...


static const u32 uniphier_pxs2_gpio_irqs[] = {
        48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
        154, 155, 156, 157, 158, 217, 218, 219,
};

static const struct uniphier_gpio_socdata uniphier_pxs2_gpio_data = {
        .ngpio = 232,
        .irqs = uniphier_pxs2_gpio_irqs,
        .nirqs = ARRAY_SIZE(uniphier_pxs2_gpio_irqs),
};
Masahiro Yamada Sept. 7, 2017, 1:11 a.m. | #4
Hi Linus,


2017-08-31 22:41 GMT+09:00 Linus Walleij <linus.walleij@linaro.org>:
> On Tue, Aug 22, 2017 at 6:16 PM, Masahiro Yamada
> <yamada.masahiro@socionext.com> wrote:
>
>> This GPIO controller device is used on UniPhier SoCs.
>>
>> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
>> ---
>>
>> Changes in v3:
>>   - Add .irq_set_affinity() hook
>>   - Use irq_domain_create_hierarchy() instead of legacy
>>     irq_domain_add_hierarchy().
>
> This is getting better and better.
>
>> +static const u32 uniphier_gpio_irq_parent_hwirqs[] = {
>> +       48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
>> +       154, 155, 156, 157, 158, 217, 218, 219,
>> +};
>
> This array which is used when allocating the hierarchical domain
> looks like configuration data. Why is it not in the device tree?
>


Another solution might be
to use the brand-new irq_domain_push_irq().


With a quick look at it, the hierarchy IRQ domain can work with
#interrupts property by inserting the outer-most irq_data with
irq_domain_push_irq().


If you are unhappy with hard-coded configuration parameters,
I will switch to generic compatible + DT properties approach.

Patch

diff --git a/Documentation/devicetree/bindings/gpio/gpio-uniphier.txt b/Documentation/devicetree/bindings/gpio/gpio-uniphier.txt
new file mode 100644
index 000000000000..8e3e1fe0d072
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-uniphier.txt
@@ -0,0 +1,42 @@ 
+UniPhier GPIO controller
+
+Required properties:
+- compatible: Should be one of the following:
+    "socionext,uniphier-ld4-gpio"  - for LD4 SoC
+    "socionext,uniphier-pro4-gpio" - for Pro4 SoC
+    "socionext,uniphier-sld8-gpio" - for sLD8 SoC
+    "socionext,uniphier-pro5-gpio" - for Pro5 SoC
+    "socionext,uniphier-pxs2-gpio" - for PXs2/LD6b SoC
+    "socionext,uniphier-ld11-gpio" - for LD11 SoC
+    "socionext,uniphier-ld20-gpio" - for LD20 SoC
+    "socionext,uniphier-pxs3-gpio" - for PXs3 SoC
+- reg: Specifies offset and length of the register set for the device.
+- gpio-controller: Marks the device node as a GPIO controller.
+- #gpio-cells: Should be 2.  The first cell is the pin number and the second
+  cell is used to specify optional parameters
+- interrupt-parent: Specifies the parent interrupt controller.
+- interrupt-controller: Marks the device node as an interrupt controller
+- #interrupt-cells: Should be 2.  The first cell defines the interrupt number.
+  The second cell bits[3:0] is used to specify trigger type as follows:
+    1 = low-to-high edge triggered
+    2 = high-to-low edge triggered
+    4 = active high level-sensitive
+    8 = active low level-sensitive
+  Valid combinations are 1, 2, 3, 4, 8.
+- gpio-ranges: Mapping to pin controller pins (as described in gpio.txt)
+
+Optional properties:
+- gpio-ranges-group-names: Used for named gpio ranges (as described in gpio.txt)
+
+Example:
+	gpio: gpio@55000000 {
+		compatible = "socionext,uniphier-pro4-gpio";
+		reg = <0x55000000 0x200>;
+		interrupt-parent = <&aidet>;
+		interrupt-controller;
+		#interrupt-cells = <2>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-ranges = <&pinctrl 0 0 0>;
+		gpio-ranges-group-names = "gpio_range";
+	};
diff --git a/MAINTAINERS b/MAINTAINERS
index 7b84f047b3fd..9a1f94ff99a6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1992,6 +1992,7 @@  F:	arch/arm/mm/cache-uniphier.c
 F:	arch/arm64/boot/dts/socionext/
 F:	drivers/bus/uniphier-system-bus.c
 F:	drivers/clk/uniphier/
+F:	drivers/gpio/gpio-uniphier.c
 F:	drivers/i2c/busses/i2c-uniphier*
 F:	drivers/irqchip/irq-uniphier-aidet.c
 F:	drivers/pinctrl/uniphier/
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 461d6fc3688b..5f6d2e984bb6 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -465,6 +465,13 @@  config GPIO_TZ1090_PDC
 	help
 	  Say yes here to support Toumaz Xenif TZ1090 PDC GPIOs.
 
+config GPIO_UNIPHIER
+	tristate "UniPhier GPIO support"
+	depends on ARCH_UNIPHIER
+	depends on OF_GPIO
+	help
+	  Say yes here to support UniPhier GPIOs.
+
 config GPIO_VF610
 	def_bool y
 	depends on ARCH_MXC && SOC_VF610
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index a9fda6c55113..1de9fdb8cff9 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -129,6 +129,7 @@  obj-$(CONFIG_GPIO_TWL6040)	+= gpio-twl6040.o
 obj-$(CONFIG_GPIO_TZ1090)	+= gpio-tz1090.o
 obj-$(CONFIG_GPIO_TZ1090_PDC)	+= gpio-tz1090-pdc.o
 obj-$(CONFIG_GPIO_UCB1400)	+= gpio-ucb1400.o
+obj-$(CONFIG_GPIO_UNIPHIER)	+= gpio-uniphier.o
 obj-$(CONFIG_GPIO_VF610)	+= gpio-vf610.o
 obj-$(CONFIG_GPIO_VIPERBOARD)	+= gpio-viperboard.o
 obj-$(CONFIG_GPIO_VR41XX)	+= gpio-vr41xx.o
diff --git a/drivers/gpio/gpio-uniphier.c b/drivers/gpio/gpio-uniphier.c
new file mode 100644
index 000000000000..e0cd408f8871
--- /dev/null
+++ b/drivers/gpio/gpio-uniphier.c
@@ -0,0 +1,589 @@ 
+/*
+ * Copyright (C) 2017 Socionext Inc.
+ *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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/bitops.h>
+#include <linux/gpio/driver.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <dt-bindings/gpio/uniphier-gpio.h>
+
+#define UNIPHIER_GPIO_BANK_MASK		\
+				GENMASK((UNIPHIER_GPIO_LINES_PER_BANK) - 1, 0)
+
+#define UNIPHIER_GPIO_IRQ_NUM		24
+
+#define UNIPHIER_GPIO_PORT_DATA		0x0	/* data */
+#define UNIPHIER_GPIO_PORT_DIR		0x4	/* direction (1:in, 0:out) */
+#define UNIPHIER_GPIO_IRQ_EN		0x90	/* irq enable */
+#define UNIPHIER_GPIO_IRQ_MODE		0x94	/* irq mode (1: both edge) */
+#define UNIPHIER_GPIO_IRQ_FLT_EN	0x98	/* noise filter enable */
+#define UNIPHIER_GPIO_IRQ_FLT_CYC	0x9c	/* noise filter clock cycle */
+
+struct uniphier_gpio_socdata {
+	unsigned int ngpio;
+	bool (*is_valid_irq)(unsigned int hwirq);
+	bool (*is_input_only)(unsigned int offset);
+};
+
+struct uniphier_gpio_priv {
+	struct irq_domain *domain;
+	const struct uniphier_gpio_socdata *socdata;
+	void __iomem *regs;
+	spinlock_t lock;
+	u32 saved_vals[0];
+};
+
+static unsigned int uniphier_gpio_bank_to_reg(unsigned int bank)
+{
+	unsigned int reg;
+
+	reg = (bank + 1) * 8;
+
+	/*
+	 * Unfortunately, the GPIO port registers are not contiguous because
+	 * offset 0x90-0x9f is used for IRQ.  Add 0x10 when crossing the region.
+	 */
+	if (reg >= UNIPHIER_GPIO_IRQ_EN)
+		reg += 0x10;
+
+	return reg;
+}
+
+static void uniphier_gpio_get_bank_and_mask(unsigned int offset,
+					    unsigned int *bank, u32 *mask)
+{
+	*bank = offset / UNIPHIER_GPIO_LINES_PER_BANK;
+	*mask = BIT(offset % UNIPHIER_GPIO_LINES_PER_BANK);
+}
+
+static void uniphier_gpio_reg_update(struct uniphier_gpio_priv *priv,
+				     unsigned int reg, u32 mask, u32 val)
+{
+	unsigned long flags;
+	u32 tmp;
+
+	spin_lock_irqsave(&priv->lock, flags);
+	tmp = readl(priv->regs + reg);
+	tmp &= ~mask;
+	tmp |= mask & val;
+	writel(tmp, priv->regs + reg);
+	spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static void uniphier_gpio_bank_write(struct gpio_chip *chip, unsigned int bank,
+				     unsigned int reg, u32 mask, u32 val)
+{
+	struct uniphier_gpio_priv *priv = gpiochip_get_data(chip);
+
+	if (!mask)
+		return;
+
+	uniphier_gpio_reg_update(priv, uniphier_gpio_bank_to_reg(bank) + reg,
+				 mask, val);
+}
+
+static void uniphier_gpio_offset_write(struct gpio_chip *chip,
+				       unsigned int offset, unsigned int reg,
+				       int val)
+{
+	unsigned int bank;
+	u32 mask;
+
+	uniphier_gpio_get_bank_and_mask(offset, &bank, &mask);
+
+	uniphier_gpio_bank_write(chip, bank, reg, mask, val ? mask : 0);
+}
+
+static int uniphier_gpio_offset_read(struct gpio_chip *chip,
+				     unsigned int offset, unsigned int reg)
+{
+	struct uniphier_gpio_priv *priv = gpiochip_get_data(chip);
+	unsigned int bank, reg_offset;
+	u32 mask;
+
+	uniphier_gpio_get_bank_and_mask(offset, &bank, &mask);
+	reg_offset = uniphier_gpio_bank_to_reg(bank) + reg;
+
+	return !!(readl(priv->regs + reg_offset) & mask);
+}
+
+static int uniphier_gpio_get_direction(struct gpio_chip *chip,
+				       unsigned int offset)
+{
+	return uniphier_gpio_offset_read(chip, offset, UNIPHIER_GPIO_PORT_DIR);
+}
+
+static int uniphier_gpio_direction_input(struct gpio_chip *chip,
+					 unsigned int offset)
+{
+	uniphier_gpio_offset_write(chip, offset, UNIPHIER_GPIO_PORT_DIR, 1);
+
+	return 0;
+}
+
+static int uniphier_gpio_direction_output(struct gpio_chip *chip,
+					  unsigned int offset, int val)
+{
+	struct uniphier_gpio_priv *priv = gpiochip_get_data(chip);
+
+	if (priv->socdata->is_input_only &&
+	    priv->socdata->is_input_only(offset)) {
+		dev_err(chip->parent, "GPIO%d is input only port\n", offset);
+		return -EINVAL;
+	}
+
+	uniphier_gpio_offset_write(chip, offset, UNIPHIER_GPIO_PORT_DATA, val);
+	uniphier_gpio_offset_write(chip, offset, UNIPHIER_GPIO_PORT_DIR, 0);
+
+	return 0;
+}
+
+static int uniphier_gpio_get(struct gpio_chip *chip, unsigned int offset)
+{
+	return uniphier_gpio_offset_read(chip, offset, UNIPHIER_GPIO_PORT_DATA);
+}
+
+static void uniphier_gpio_set(struct gpio_chip *chip,
+			      unsigned int offset, int val)
+{
+	uniphier_gpio_offset_write(chip, offset, UNIPHIER_GPIO_PORT_DATA, val);
+}
+
+static void uniphier_gpio_set_multiple(struct gpio_chip *chip,
+				       unsigned long *mask, unsigned long *bits)
+{
+	unsigned int bank, shift, bank_mask, bank_bits;
+	int i;
+
+	for (i = 0; i < chip->ngpio; i += UNIPHIER_GPIO_LINES_PER_BANK) {
+		bank = i / UNIPHIER_GPIO_LINES_PER_BANK;
+		shift = i % BITS_PER_LONG;
+		bank_mask = (mask[BIT_WORD(i)] >> shift) &
+						UNIPHIER_GPIO_BANK_MASK;
+		bank_bits = bits[BIT_WORD(i)] >> shift;
+
+		uniphier_gpio_bank_write(chip, bank, UNIPHIER_GPIO_PORT_DATA,
+					 bank_mask, bank_bits);
+	}
+}
+
+static int uniphier_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
+{
+	struct irq_fwspec fwspec;
+
+	if (offset < UNIPHIER_GPIO_IRQ_OFFSET)
+		return -ENXIO;
+
+	fwspec.fwnode = of_node_to_fwnode(chip->parent->of_node);
+	fwspec.param_count = 2;
+	fwspec.param[0] = offset - UNIPHIER_GPIO_IRQ_OFFSET;
+	fwspec.param[1] = IRQ_TYPE_NONE;
+
+	return irq_create_fwspec_mapping(&fwspec);
+}
+
+static struct gpio_chip uniphier_gpio_chip = {
+	.label = "UniPhier GPIO",
+	.request = gpiochip_generic_request,
+	.free = gpiochip_generic_free,
+	.get_direction = uniphier_gpio_get_direction,
+	.direction_input = uniphier_gpio_direction_input,
+	.direction_output = uniphier_gpio_direction_output,
+	.get = uniphier_gpio_get,
+	.set = uniphier_gpio_set,
+	.set_multiple = uniphier_gpio_set_multiple,
+	.to_irq = uniphier_gpio_to_irq,
+	.base = -1,
+};
+
+static void uniphier_gpio_irq_mask(struct irq_data *data)
+{
+	struct uniphier_gpio_priv *priv = data->chip_data;
+	u32 mask = BIT(data->hwirq);
+
+	uniphier_gpio_reg_update(priv, UNIPHIER_GPIO_IRQ_EN, mask, 0);
+
+	return irq_chip_mask_parent(data);
+}
+
+static void uniphier_gpio_irq_unmask(struct irq_data *data)
+{
+	struct uniphier_gpio_priv *priv = data->chip_data;
+	u32 mask = BIT(data->hwirq);
+
+	uniphier_gpio_reg_update(priv, UNIPHIER_GPIO_IRQ_EN, mask, mask);
+
+	return irq_chip_unmask_parent(data);
+}
+
+static int uniphier_gpio_irq_set_type(struct irq_data *data, unsigned int type)
+{
+	struct uniphier_gpio_priv *priv = data->chip_data;
+	u32 mask = BIT(data->hwirq);
+	u32 val = 0;
+
+	if (type == IRQ_TYPE_EDGE_BOTH) {
+		val = mask;
+		type = IRQ_TYPE_EDGE_FALLING;
+	}
+
+	uniphier_gpio_reg_update(priv, UNIPHIER_GPIO_IRQ_MODE, mask, val);
+	/* To enable both edge detection, the noise filter must be enabled. */
+	uniphier_gpio_reg_update(priv, UNIPHIER_GPIO_IRQ_FLT_EN, mask, val);
+
+	return irq_chip_set_type_parent(data, type);
+}
+
+static struct irq_chip uniphier_gpio_irq_chip = {
+	.name = "GPIO",
+	.irq_mask = uniphier_gpio_irq_mask,
+	.irq_unmask = uniphier_gpio_irq_unmask,
+	.irq_eoi = irq_chip_eoi_parent,
+	.irq_set_affinity = irq_chip_set_affinity_parent,
+	.irq_set_type = uniphier_gpio_irq_set_type,
+};
+
+static const u32 uniphier_gpio_irq_parent_hwirqs[] = {
+	48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
+	154, 155, 156, 157, 158, 217, 218, 219,
+};
+
+static int uniphier_gpio_irq_domain_translate(struct irq_domain *domain,
+					      struct irq_fwspec *fwspec,
+					      unsigned long *out_hwirq,
+					      unsigned int *out_type)
+{
+	if (WARN_ON(fwspec->param_count < 2))
+		return -EINVAL;
+
+	*out_hwirq = fwspec->param[0];
+	*out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
+
+	return 0;
+}
+
+static int uniphier_gpio_irq_domain_alloc(struct irq_domain *domain,
+					  unsigned int virq,
+					  unsigned int nr_irqs, void *arg)
+{
+	struct uniphier_gpio_priv *priv = domain->host_data;
+	struct irq_fwspec parent_fwspec;
+	irq_hw_number_t hwirq;
+	unsigned int type;
+	int ret;
+
+	if (WARN_ON(nr_irqs != 1))
+		return -EINVAL;
+
+	ret = uniphier_gpio_irq_domain_translate(domain, arg, &hwirq, &type);
+	if (ret)
+		return ret;
+
+	if (!priv->socdata->is_valid_irq(hwirq))
+		return -ENXIO;
+
+	ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
+					    &uniphier_gpio_irq_chip, priv);
+	if (ret)
+		return ret;
+
+	if (type == IRQ_TYPE_EDGE_BOTH)
+		type = IRQ_TYPE_EDGE_FALLING;
+
+	BUILD_BUG_ON(ARRAY_SIZE(uniphier_gpio_irq_parent_hwirqs) >
+		     UNIPHIER_GPIO_IRQ_NUM);
+
+	/* parent is UniPhier AIDET */
+	parent_fwspec.fwnode = domain->parent->fwnode;
+	parent_fwspec.param_count = 2;
+	parent_fwspec.param[0] = uniphier_gpio_irq_parent_hwirqs[hwirq];
+	parent_fwspec.param[1] = type;
+
+	return irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec);
+}
+
+static void uniphier_gpio_irq_domain_activate(struct irq_domain *domain,
+					      struct irq_data *data)
+{
+	gpiochip_lock_as_irq(&uniphier_gpio_chip,
+			     data->hwirq + UNIPHIER_GPIO_IRQ_OFFSET);
+}
+
+static void uniphier_gpio_irq_domain_deactivate(struct irq_domain *domain,
+						struct irq_data *data)
+{
+	gpiochip_unlock_as_irq(&uniphier_gpio_chip,
+			       data->hwirq + UNIPHIER_GPIO_IRQ_OFFSET);
+}
+
+static const struct irq_domain_ops uniphier_gpio_irq_domain_ops = {
+	.alloc = uniphier_gpio_irq_domain_alloc,
+	.free = irq_domain_free_irqs_common,
+	.activate = uniphier_gpio_irq_domain_activate,
+	.deactivate = uniphier_gpio_irq_domain_deactivate,
+	.translate = uniphier_gpio_irq_domain_translate,
+};
+
+static void uniphier_gpio_hw_init(struct uniphier_gpio_priv *priv)
+{
+	/*
+	 * To detect both edge interrupts, the noise filter must be enabled.
+	 * This filter is intended to remove the noise from the irq lines.
+	 * It does not work for GPIO input, so GPIO debounce is not supported.
+	 * Unfortunately, the filter period is shared among all irq lines.
+	 * Just choose a sensible period here.
+	 */
+	writel(0xff, priv->regs + UNIPHIER_GPIO_IRQ_FLT_CYC);
+}
+
+static unsigned int uniphier_gpio_get_nbanks(unsigned int ngpio)
+{
+	return DIV_ROUND_UP(ngpio, UNIPHIER_GPIO_LINES_PER_BANK);
+}
+
+static int uniphier_gpio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *parent_np;
+	struct irq_domain *parent_domain;
+	struct uniphier_gpio_priv *priv;
+	const struct uniphier_gpio_socdata *data;
+	struct resource *regs;
+	unsigned int nregs;
+	int ret;
+
+	parent_np = of_irq_find_parent(dev->of_node);
+	if (!parent_np)
+		return -ENXIO;
+
+	parent_domain = irq_find_host(parent_np);
+	of_node_put(parent_np);
+	if (!parent_domain)
+		return -EPROBE_DEFER;
+
+	data = of_device_get_match_data(dev);
+	if (WARN_ON(!data || !data->is_valid_irq))
+		return -EINVAL;
+
+	nregs = uniphier_gpio_get_nbanks(data->ngpio) * 2 + 3;
+	priv = devm_kzalloc(dev,
+			    sizeof(*priv) + sizeof(priv->saved_vals[0]) * nregs,
+			    GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	priv->regs = devm_ioremap_resource(dev, regs);
+	if (IS_ERR(priv->regs))
+		return PTR_ERR(priv->regs);
+
+	spin_lock_init(&priv->lock);
+	priv->socdata = data;
+
+	uniphier_gpio_hw_init(priv);
+
+	uniphier_gpio_chip.parent = dev;
+	uniphier_gpio_chip.ngpio = data->ngpio;
+
+	ret = devm_gpiochip_add_data(dev, &uniphier_gpio_chip, priv);
+	if (ret)
+		return ret;
+
+	priv->domain = irq_domain_create_hierarchy(
+					parent_domain, 0, UNIPHIER_GPIO_IRQ_NUM,
+					of_node_to_fwnode(dev->of_node),
+					&uniphier_gpio_irq_domain_ops, priv);
+	if (!priv->domain)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
+	return 0;
+}
+
+static int uniphier_gpio_remove(struct platform_device *pdev)
+{
+	struct uniphier_gpio_priv *priv = platform_get_drvdata(pdev);
+
+	irq_domain_remove(priv->domain);
+
+	return 0;
+}
+
+static int __maybe_unused uniphier_gpio_suspend(struct device *dev)
+{
+	struct uniphier_gpio_priv *priv = dev_get_drvdata(dev);
+	unsigned int nbanks = uniphier_gpio_get_nbanks(priv->socdata->ngpio);
+	u32 *val = priv->saved_vals;
+	unsigned int reg;
+	int i;
+
+	for (i = 0; i < nbanks; i++) {
+		reg = uniphier_gpio_bank_to_reg(i);
+
+		*val++ = readl(priv->regs + reg + UNIPHIER_GPIO_PORT_DATA);
+		*val++ = readl(priv->regs + reg + UNIPHIER_GPIO_PORT_DIR);
+	}
+
+	*val++ = readl(priv->regs + UNIPHIER_GPIO_IRQ_EN);
+	*val++ = readl(priv->regs + UNIPHIER_GPIO_IRQ_MODE);
+	*val++ = readl(priv->regs + UNIPHIER_GPIO_IRQ_FLT_EN);
+
+	return 0;
+}
+
+static int __maybe_unused uniphier_gpio_resume(struct device *dev)
+{
+	struct uniphier_gpio_priv *priv = dev_get_drvdata(dev);
+	unsigned int nbanks = uniphier_gpio_get_nbanks(priv->socdata->ngpio);
+	const u32 *val = priv->saved_vals;
+	unsigned int reg;
+	int i;
+
+	for (i = 0; i < nbanks; i++) {
+		reg = uniphier_gpio_bank_to_reg(i);
+
+		writel(*val++, priv->regs + reg + UNIPHIER_GPIO_PORT_DATA);
+		writel(*val++, priv->regs + reg + UNIPHIER_GPIO_PORT_DIR);
+	}
+
+	writel(*val++, priv->regs + UNIPHIER_GPIO_IRQ_EN);
+	writel(*val++, priv->regs + UNIPHIER_GPIO_IRQ_MODE);
+	writel(*val++, priv->regs + UNIPHIER_GPIO_IRQ_FLT_EN);
+
+	uniphier_gpio_hw_init(priv);
+
+	return 0;
+}
+
+static const struct dev_pm_ops uniphier_gpio_pm_ops = {
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(uniphier_gpio_suspend,
+				     uniphier_gpio_resume)
+};
+
+static bool uniphier_ld4_gpio_is_valid_irq(unsigned int hwirq)
+{
+	return hwirq < 16 && hwirq != 13;
+}
+
+static const struct uniphier_gpio_socdata uniphier_ld4_gpio_data = {
+	.ngpio = 136,
+	.is_valid_irq = uniphier_ld4_gpio_is_valid_irq,
+};
+
+static bool uniphier_pro4_gpio_is_valid_irq(unsigned int hwirq)
+{
+	return hwirq < 21;
+}
+
+static const struct uniphier_gpio_socdata uniphier_pro4_gpio_data = {
+	.ngpio = 248,
+	.is_valid_irq = uniphier_pro4_gpio_is_valid_irq,
+};
+
+static bool uniphier_pxs2_gpio_is_valid_irq(unsigned int hwirq)
+{
+	return hwirq < 24;
+}
+
+static const struct uniphier_gpio_socdata uniphier_pxs2_gpio_data = {
+	.ngpio = 232,
+	.is_valid_irq = uniphier_pxs2_gpio_is_valid_irq,
+};
+
+static bool uniphier_ld11_gpio_is_input_only(unsigned int offset)
+{
+	return offset >= 144 && offset <= 151;
+}
+
+static const struct uniphier_gpio_socdata uniphier_ld11_gpio_data = {
+	.ngpio = 200,
+	.is_valid_irq = uniphier_pxs2_gpio_is_valid_irq,
+	.is_input_only = uniphier_ld11_gpio_is_input_only,
+};
+
+static const struct uniphier_gpio_socdata uniphier_ld20_gpio_data = {
+	.ngpio = 205,
+	.is_valid_irq = uniphier_pxs2_gpio_is_valid_irq,
+	.is_input_only = uniphier_ld11_gpio_is_input_only,
+};
+
+static bool uniphier_pxs3_gpio_is_input_only(unsigned int offset)
+{
+	return offset >= 144 && offset <= 161;
+}
+
+static const struct uniphier_gpio_socdata uniphier_pxs3_gpio_data = {
+	.ngpio = 286,
+	.is_valid_irq = uniphier_pxs2_gpio_is_valid_irq,
+	.is_input_only = uniphier_pxs3_gpio_is_input_only,
+};
+
+static const struct of_device_id uniphier_gpio_match[] = {
+	{
+		.compatible = "socionext,uniphier-ld4-gpio",
+		.data = &uniphier_ld4_gpio_data,
+	},
+	{
+		.compatible = "socionext,uniphier-pro4-gpio",
+		.data = &uniphier_pro4_gpio_data,
+	},
+	{
+		.compatible = "socionext,uniphier-sld8-gpio",
+		.data = &uniphier_ld4_gpio_data,
+	},
+	{
+		.compatible = "socionext,uniphier-pro5-gpio",
+		.data = &uniphier_pro4_gpio_data,
+	},
+	{
+		.compatible = "socionext,uniphier-pxs2-gpio",
+		.data = &uniphier_pxs2_gpio_data,
+	},
+	{
+		.compatible = "socionext,uniphier-ld11-gpio",
+		.data = &uniphier_ld11_gpio_data,
+	},
+	{
+		.compatible = "socionext,uniphier-ld20-gpio",
+		.data = &uniphier_ld20_gpio_data,
+	},
+	{
+		.compatible = "socionext,uniphier-pxs3-gpio",
+		.data = &uniphier_pxs3_gpio_data,
+	},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, uniphier_gpio_match);
+
+static struct platform_driver uniphier_gpio_driver = {
+	.probe = uniphier_gpio_probe,
+	.remove = uniphier_gpio_remove,
+	.driver = {
+		.name = "uniphier-gpio",
+		.of_match_table = uniphier_gpio_match,
+		.pm = &uniphier_gpio_pm_ops,
+	},
+};
+module_platform_driver(uniphier_gpio_driver);
+
+MODULE_AUTHOR("Masahiro Yamada <yamada.masahiro@socionext.com>");
+MODULE_DESCRIPTION("UniPhier GPIO driver");
+MODULE_LICENSE("GPL");
diff --git a/include/dt-bindings/gpio/uniphier-gpio.h b/include/dt-bindings/gpio/uniphier-gpio.h
new file mode 100644
index 000000000000..9f0ad174f61c
--- /dev/null
+++ b/include/dt-bindings/gpio/uniphier-gpio.h
@@ -0,0 +1,18 @@ 
+/*
+ * Copyright (C) 2017 Socionext Inc.
+ *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
+ */
+
+#ifndef _DT_BINDINGS_GPIO_UNIPHIER_H
+#define _DT_BINDINGS_GPIO_UNIPHIER_H
+
+#define UNIPHIER_GPIO_LINES_PER_BANK	8
+
+#define UNIPHIER_GPIO_IRQ_OFFSET	((UNIPHIER_GPIO_LINES_PER_BANK) * 15)
+
+#define UNIPHIER_GPIO_PORT(bank, line)	\
+			((UNIPHIER_GPIO_LINES_PER_BANK) * (bank) + (line))
+
+#define UNIPHIER_GPIO_IRQ(n)		((UNIPHIER_GPIO_IRQ_OFFSET) + (n))
+
+#endif /* _DT_BINDINGS_GPIO_UNIPHIER_H */