diff mbox series

[v5,08/13] gpio: add support for the sl28cpld GPIO controller

Message ID 20200706175353.16404-9-michael@walle.cc
State Not Applicable
Headers show
Series Add support for Kontron sl28cpld | expand

Commit Message

Michael Walle July 6, 2020, 5:53 p.m. UTC 
Add support for the GPIO controller of the sl28 board management
controller. This driver is part of a multi-function device.

A controller has 8 lines. There are three different flavors:
full-featured GPIO with interrupt support, input-only and output-only.

Signed-off-by: Michael Walle <michael@walle.cc>
---
Changes since v4:
 - update copyright year
 - remove #include <linux/of_device.h>, suggested by Andy.
 - use device_get_match_data(), suggested by Andy.
 - drop the irq_support variable, instead call _init_irq() directly,
   suggested by Andy.
 - also move the irq code a bit around to make it look nicer
 - drop "struct sl28cpld_gpio". We don't need to actually store the
   irq_chip and irq_chip_data, everything is device resource managed.
 - use 100 chars line limit, suggested by Andy.
 - remove the platform device table
 - don't use KBUID_MODNAME

Changes since v3:
 - see cover letter

 drivers/gpio/Kconfig         |  11 +++
 drivers/gpio/Makefile        |   1 +
 drivers/gpio/gpio-sl28cpld.c | 161 +++++++++++++++++++++++++++++++++++
 3 files changed, 173 insertions(+)
 create mode 100644 drivers/gpio/gpio-sl28cpld.c

Comments

Linus Walleij July 8, 2020, 7:35 a.m. UTC | #1 
On Mon, Jul 6, 2020 at 7:57 PM Michael Walle <michael@walle.cc> wrote:

> Add support for the GPIO controller of the sl28 board management
> controller. This driver is part of a multi-function device.
>
> A controller has 8 lines. There are three different flavors:
> full-featured GPIO with interrupt support, input-only and output-only.
>
> Signed-off-by: Michael Walle <michael@walle.cc>
> ---
> Changes since v4:

This is awesomely elegant now.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

I suppose it needs merging through MFD with the rest.

Yours,
Linus Walleij
kernel test robot July 17, 2020, 12:25 a.m. UTC | #2 
Hi Michael,

I love your patch! Perhaps something to improve:

[auto build test WARNING on ljones-mfd/for-mfd-next]
[also build test WARNING on shawnguo/for-next v5.8-rc5]
[cannot apply to gpio/for-next hwmon/hwmon-next next-20200716]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Michael-Walle/Add-support-for-Kontron-sl28cpld/20200707-020034
base:   https://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd.git for-mfd-next
config: x86_64-allyesconfig (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ed6b578040a85977026c93bf4188f996148f3218)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpio/gpio-sl28cpld.c:121:29: warning: implicit conversion from 'unsigned long' to 'unsigned int' changes value from 18446744073709551615 to 4294967295 [-Wconstant-conversion]
                   config.reg_dir_out_base = GPIO_REGMAP_ADDR(base + GPIO_REG_DIR);
                                           ~ ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/gpio/regmap.h:12:44: note: expanded from macro 'GPIO_REGMAP_ADDR'
   #define GPIO_REGMAP_ADDR(addr) ((addr) ? : GPIO_REGMAP_ADDR_ZERO)
                                              ^~~~~~~~~~~~~~~~~~~~~
   include/linux/gpio/regmap.h:11:32: note: expanded from macro 'GPIO_REGMAP_ADDR_ZERO'
   #define GPIO_REGMAP_ADDR_ZERO ((unsigned long)(-1))
                                  ^~~~~~~~~~~~~~~~~~~
   1 warning generated.

vim +121 drivers/gpio/gpio-sl28cpld.c

    88	
    89	static int sl28cpld_gpio_probe(struct platform_device *pdev)
    90	{
    91		struct gpio_regmap_config config = {0};
    92		enum sl28cpld_gpio_type type;
    93		struct regmap *regmap;
    94		u32 base;
    95		int ret;
    96	
    97		if (!pdev->dev.parent)
    98			return -ENODEV;
    99	
   100		type = (uintptr_t)device_get_match_data(&pdev->dev);
   101		if (!type)
   102			return -ENODEV;
   103	
   104		ret = device_property_read_u32(&pdev->dev, "reg", &base);
   105		if (ret)
   106			return -EINVAL;
   107	
   108		regmap = dev_get_regmap(pdev->dev.parent, NULL);
   109		if (!regmap)
   110			return -ENODEV;
   111	
   112		config.regmap = regmap;
   113		config.parent = &pdev->dev;
   114		config.ngpio = 8;
   115	
   116		switch (type) {
   117		case SL28CPLD_GPIO:
   118			config.reg_dat_base = base + GPIO_REG_IN;
   119			config.reg_set_base = base + GPIO_REG_OUT;
   120			/* reg_dir_out_base might be zero */
 > 121			config.reg_dir_out_base = GPIO_REGMAP_ADDR(base + GPIO_REG_DIR);
   122	
   123			/* This type supports interrupts */
   124			ret = sl28cpld_gpio_irq_init(pdev, base, &config);
   125			if (ret)
   126				return ret;
   127			break;
   128		case SL28CPLD_GPO:
   129			config.reg_set_base = base + GPO_REG_OUT;
   130			break;
   131		case SL28CPLD_GPI:
   132			config.reg_dat_base = base + GPI_REG_IN;
   133			break;
   134		default:
   135			dev_err(&pdev->dev, "unknown type %d\n", type);
   136			return -ENODEV;
   137		}
   138	
   139		return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
   140	}
   141	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 05e0801c6a78..f67df2b02de4 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1215,6 +1215,17 @@  config GPIO_RC5T583
 	  This driver provides the support for driving/reading the gpio pins
 	  of RC5T583 device through standard gpio library.
 
+config GPIO_SL28CPLD
+	tristate "Kontron sl28cpld GPIO support"
+	select MFD_SIMPLE_MFD_I2C
+	select GPIO_REGMAP
+	select GPIOLIB_IRQCHIP
+	help
+	  This enables support for the GPIOs found on the Kontron sl28 CPLD.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called gpio-sl28cpld.
+
 config GPIO_STMPE
 	bool "STMPE GPIOs"
 	depends on MFD_STMPE
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index ef666cfef9d0..cb8ed4463265 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -131,6 +131,7 @@  obj-$(CONFIG_GPIO_SCH311X)		+= gpio-sch311x.o
 obj-$(CONFIG_GPIO_SCH)			+= gpio-sch.o
 obj-$(CONFIG_GPIO_SIFIVE)		+= gpio-sifive.o
 obj-$(CONFIG_GPIO_SIOX)			+= gpio-siox.o
+obj-$(CONFIG_GPIO_SL28CPLD)		+= gpio-sl28cpld.o
 obj-$(CONFIG_GPIO_SODAVILLE)		+= gpio-sodaville.o
 obj-$(CONFIG_GPIO_SPEAR_SPICS)		+= gpio-spear-spics.o
 obj-$(CONFIG_GPIO_SPRD)			+= gpio-sprd.o
diff --git a/drivers/gpio/gpio-sl28cpld.c b/drivers/gpio/gpio-sl28cpld.c
new file mode 100644
index 000000000000..889b8f5622c2
--- /dev/null
+++ b/drivers/gpio/gpio-sl28cpld.c
@@ -0,0 +1,161 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * sl28cpld GPIO driver
+ *
+ * Copyright 2020 Michael Walle <michael@walle.cc>
+ */
+
+#include <linux/device.h>
+#include <linux/gpio/driver.h>
+#include <linux/gpio/regmap.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+/* GPIO flavor */
+#define GPIO_REG_DIR	0x00
+#define GPIO_REG_OUT	0x01
+#define GPIO_REG_IN	0x02
+#define GPIO_REG_IE	0x03
+#define GPIO_REG_IP	0x04
+
+/* input-only flavor */
+#define GPI_REG_IN	0x00
+
+/* output-only flavor */
+#define GPO_REG_OUT	0x00
+
+enum sl28cpld_gpio_type {
+	SL28CPLD_GPIO = 1,
+	SL28CPLD_GPI,
+	SL28CPLD_GPO,
+};
+
+static const struct regmap_irq sl28cpld_gpio_irqs[] = {
+	REGMAP_IRQ_REG_LINE(0, 8),
+	REGMAP_IRQ_REG_LINE(1, 8),
+	REGMAP_IRQ_REG_LINE(2, 8),
+	REGMAP_IRQ_REG_LINE(3, 8),
+	REGMAP_IRQ_REG_LINE(4, 8),
+	REGMAP_IRQ_REG_LINE(5, 8),
+	REGMAP_IRQ_REG_LINE(6, 8),
+	REGMAP_IRQ_REG_LINE(7, 8),
+};
+
+static int sl28cpld_gpio_irq_init(struct platform_device *pdev,
+				  unsigned int base,
+				  struct gpio_regmap_config *config)
+{
+	struct regmap_irq_chip_data *irq_data;
+	struct regmap_irq_chip *irq_chip;
+	struct device *dev = &pdev->dev;
+	int irq, ret;
+
+	if (!device_property_read_bool(dev, "interrupt-controller"))
+		return 0;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	irq_chip = devm_kzalloc(dev, sizeof(*irq_chip), GFP_KERNEL);
+	if (!irq_chip)
+		return -ENOMEM;
+
+	irq_chip->name = "sl28cpld-gpio-irq",
+	irq_chip->irqs = sl28cpld_gpio_irqs;
+	irq_chip->num_irqs = ARRAY_SIZE(sl28cpld_gpio_irqs);
+	irq_chip->num_regs = 1;
+	irq_chip->status_base = base + GPIO_REG_IP;
+	irq_chip->mask_base = base + GPIO_REG_IE;
+	irq_chip->mask_invert = true,
+	irq_chip->ack_base = base + GPIO_REG_IP;
+
+	ret = devm_regmap_add_irq_chip_fwnode(dev, dev_fwnode(dev),
+					      config->regmap, irq,
+					      IRQF_SHARED | IRQF_ONESHOT,
+					      0, irq_chip, &irq_data);
+	if (ret)
+		return ret;
+
+	config->irq_domain = regmap_irq_get_domain(irq_data);
+
+	return 0;
+}
+
+static int sl28cpld_gpio_probe(struct platform_device *pdev)
+{
+	struct gpio_regmap_config config = {0};
+	enum sl28cpld_gpio_type type;
+	struct regmap *regmap;
+	u32 base;
+	int ret;
+
+	if (!pdev->dev.parent)
+		return -ENODEV;
+
+	type = (uintptr_t)device_get_match_data(&pdev->dev);
+	if (!type)
+		return -ENODEV;
+
+	ret = device_property_read_u32(&pdev->dev, "reg", &base);
+	if (ret)
+		return -EINVAL;
+
+	regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!regmap)
+		return -ENODEV;
+
+	config.regmap = regmap;
+	config.parent = &pdev->dev;
+	config.ngpio = 8;
+
+	switch (type) {
+	case SL28CPLD_GPIO:
+		config.reg_dat_base = base + GPIO_REG_IN;
+		config.reg_set_base = base + GPIO_REG_OUT;
+		/* reg_dir_out_base might be zero */
+		config.reg_dir_out_base = GPIO_REGMAP_ADDR(base + GPIO_REG_DIR);
+
+		/* This type supports interrupts */
+		ret = sl28cpld_gpio_irq_init(pdev, base, &config);
+		if (ret)
+			return ret;
+		break;
+	case SL28CPLD_GPO:
+		config.reg_set_base = base + GPO_REG_OUT;
+		break;
+	case SL28CPLD_GPI:
+		config.reg_dat_base = base + GPI_REG_IN;
+		break;
+	default:
+		dev_err(&pdev->dev, "unknown type %d\n", type);
+		return -ENODEV;
+	}
+
+	return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(&pdev->dev, &config));
+}
+
+static const struct of_device_id sl28cpld_gpio_of_match[] = {
+	{ .compatible = "kontron,sl28cpld-gpio", .data = (void *)SL28CPLD_GPIO },
+	{ .compatible = "kontron,sl28cpld-gpi", .data = (void *)SL28CPLD_GPI },
+	{ .compatible = "kontron,sl28cpld-gpo", .data = (void *)SL28CPLD_GPO },
+	{}
+};
+MODULE_DEVICE_TABLE(of, sl28cpld_gpio_of_match);
+
+static struct platform_driver sl28cpld_gpio_driver = {
+	.probe = sl28cpld_gpio_probe,
+	.driver = {
+		.name = "sl28cpld-gpio",
+		.of_match_table = sl28cpld_gpio_of_match,
+	},
+};
+module_platform_driver(sl28cpld_gpio_driver);
+
+MODULE_DESCRIPTION("sl28cpld GPIO Driver");
+MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
+MODULE_LICENSE("GPL");