gpio: Add AXP209 GPIO driver (f72f4b44) · Commits · 戴 / test

Documentation/devicetree/bindings/gpio/gpio-axp209.txt

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		AXP209 GPIO controller

		This driver follows the usual GPIO bindings found in
		Documentation/devicetree/bindings/gpio/gpio.txt

		Required properties:
		- compatible: Should be "x-powers,axp209-gpio"
		- #gpio-cells: Should be two. The first cell is the pin number and the
		second is the GPIO flags.
		- gpio-controller: Marks the device node as a GPIO controller.

		This node must be a subnode of the axp20x PMIC, documented in
		Documentation/devicetree/bindings/mfd/axp20x.txt

		Example:

		axp209: pmic@34 {
		compatible = "x-powers,axp209";
		reg = <0x34>;
		interrupt-parent = <&nmi_intc>;
		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
		interrupt-controller;
		#interrupt-cells = <1>;

		axp_gpio: gpio {
		compatible = "x-powers,axp209-gpio";
		gpio-controller;
		#gpio-cells = <2>;
		};
		};

drivers/gpio/Kconfig

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		@@ -116,6 +116,12 @@ config GPIO_ATH79
		Select this option to enable GPIO driver for
		Atheros AR71XX/AR724X/AR913X SoC devices.

		config GPIO_AXP209
		tristate "X-Powers AXP209 PMIC GPIO Support"
		depends on MFD_AXP20X
		help
		Say yes to enable GPIO support for the AXP209 PMIC

		config GPIO_BCM_KONA
		bool "Broadcom Kona GPIO"
		depends on OF_GPIO && (ARCH_BCM_MOBILE \|\| COMPILE_TEST)

drivers/gpio/Makefile

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		@@ -28,6 +28,7 @@ obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o
		obj-$(CONFIG_GPIO_AMDPT) += gpio-amdpt.o
		obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o
		obj-$(CONFIG_GPIO_ATH79) += gpio-ath79.o
		obj-$(CONFIG_GPIO_AXP209) += gpio-axp209.o
		obj-$(CONFIG_GPIO_BCM_KONA) += gpio-bcm-kona.o
		obj-$(CONFIG_GPIO_BRCMSTB) += gpio-brcmstb.o
		obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o

drivers/gpio/gpio-axp209.c

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		/*
		* AXP20x GPIO driver
		*
		* Copyright (C) 2016 Maxime Ripard <maxime.ripard@free-electrons.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.
		*/

		#include <linux/bitops.h>
		#include <linux/device.h>
		#include <linux/gpio/driver.h>
		#include <linux/init.h>
		#include <linux/interrupt.h>
		#include <linux/kernel.h>
		#include <linux/mfd/axp20x.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/platform_device.h>
		#include <linux/regmap.h>
		#include <linux/slab.h>

		#define AXP20X_GPIO_FUNCTIONS 0x7
		#define AXP20X_GPIO_FUNCTION_OUT_LOW 0
		#define AXP20X_GPIO_FUNCTION_OUT_HIGH 1
		#define AXP20X_GPIO_FUNCTION_INPUT 2

		struct axp20x_gpio {
		struct gpio_chip chip;
		struct regmap *regmap;
		};

		static int axp20x_gpio_get_reg(unsigned offset)
		{
		switch (offset) {
		case 0:
		return AXP20X_GPIO0_CTRL;
		case 1:
		return AXP20X_GPIO1_CTRL;
		case 2:
		return AXP20X_GPIO2_CTRL;
		}

		return -EINVAL;
		}

		static int axp20x_gpio_input(struct gpio_chip *chip, unsigned offset)
		{
		struct axp20x_gpio *gpio = gpiochip_get_data(chip);
		int reg;

		reg = axp20x_gpio_get_reg(offset);
		if (reg < 0)
		return reg;

		return regmap_update_bits(gpio->regmap, reg,
		AXP20X_GPIO_FUNCTIONS,
		AXP20X_GPIO_FUNCTION_INPUT);
		}

		static int axp20x_gpio_get(struct gpio_chip *chip, unsigned offset)
		{
		struct axp20x_gpio *gpio = gpiochip_get_data(chip);
		unsigned int val;
		int reg, ret;

		reg = axp20x_gpio_get_reg(offset);
		if (reg < 0)
		return reg;

		ret = regmap_read(gpio->regmap, reg, &val);
		if (ret)
		return ret;

		return !!(val & BIT(offset + 4));
		}

		static int axp20x_gpio_output(struct gpio_chip *chip, unsigned offset,
		int value)
		{
		struct axp20x_gpio *gpio = gpiochip_get_data(chip);
		int reg;

		reg = axp20x_gpio_get_reg(offset);
		if (reg < 0)
		return reg;

		return regmap_update_bits(gpio->regmap, reg,
		AXP20X_GPIO_FUNCTIONS,
		value ? AXP20X_GPIO_FUNCTION_OUT_HIGH
		: AXP20X_GPIO_FUNCTION_OUT_LOW);
		}

		static void axp20x_gpio_set(struct gpio_chip *chip, unsigned offset,
		int value)
		{
		axp20x_gpio_output(chip, offset, value);
		}

		static int axp20x_gpio_probe(struct platform_device *pdev)
		{
		struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
		struct axp20x_gpio *gpio;
		int ret;

		if (!of_device_is_available(pdev->dev.of_node))
		return -ENODEV;

		if (!axp20x) {
		dev_err(&pdev->dev, "Parent drvdata not set\n");
		return -EINVAL;
		}

		gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
		if (!gpio)
		return -ENOMEM;

		gpio->chip.base = -1;
		gpio->chip.can_sleep = true;
		gpio->chip.parent = &pdev->dev;
		gpio->chip.label = dev_name(&pdev->dev);
		gpio->chip.owner = THIS_MODULE;
		gpio->chip.get = axp20x_gpio_get;
		gpio->chip.set = axp20x_gpio_set;
		gpio->chip.direction_input = axp20x_gpio_input;
		gpio->chip.direction_output = axp20x_gpio_output;
		gpio->chip.ngpio = 3;

		gpio->regmap = axp20x->regmap;

		ret = devm_gpiochip_add_data(&pdev->dev, &gpio->chip, gpio);
		if (ret) {
		dev_err(&pdev->dev, "Failed to register GPIO chip\n");
		return ret;
		}

		dev_info(&pdev->dev, "AXP209 GPIO driver loaded\n");

		return 0;
		}

		static const struct of_device_id axp20x_gpio_match[] = {
		{ .compatible = "x-powers,axp209-gpio" },
		{ }
		};
		MODULE_DEVICE_TABLE(of, axp20x_gpio_match);

		static struct platform_driver axp20x_gpio_driver = {
		.probe = axp20x_gpio_probe,
		.driver = {
		.name = "axp20x-gpio",
		.of_match_table = axp20x_gpio_match,
		},
		};

		module_platform_driver(axp20x_gpio_driver);

		MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
		MODULE_DESCRIPTION("AXP20x PMIC GPIO driver");
		MODULE_LICENSE("GPL");

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