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    Subject[PATCH v2 1/4] gpio: Add AXP209 GPIO driver
    Date
    The AXP209 PMIC has a bunch of GPIOs accessible, that are usually used to
    control LEDs or backlight.

    Add a driver for them

    Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
    Acked-by: Rob Herring <robh@kernel.org>
    ---
    .../devicetree/bindings/gpio/gpio-axp209.txt | 30 ++++
    drivers/gpio/Kconfig | 6 +
    drivers/gpio/Makefile | 1 +
    drivers/gpio/gpio-axp209.c | 162 +++++++++++++++++++++
    4 files changed, 199 insertions(+)
    create mode 100644 Documentation/devicetree/bindings/gpio/gpio-axp209.txt
    create mode 100644 drivers/gpio/gpio-axp209.c

    diff --git a/Documentation/devicetree/bindings/gpio/gpio-axp209.txt b/Documentation/devicetree/bindings/gpio/gpio-axp209.txt
    new file mode 100644
    index 000000000000..a6611304dd3c
    --- /dev/null
    +++ b/Documentation/devicetree/bindings/gpio/gpio-axp209.txt
    @@ -0,0 +1,30 @@
    +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>;
    + };
    +};
    diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
    index 98dd47a30fc7..7d8995b88330 100644
    --- a/drivers/gpio/Kconfig
    +++ b/drivers/gpio/Kconfig
    @@ -137,6 +137,12 @@ 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)
    diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
    index 2a035ed8f168..b7d509e27ed1 100644
    --- a/drivers/gpio/Makefile
    +++ b/drivers/gpio/Makefile
    @@ -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
    diff --git a/drivers/gpio/gpio-axp209.c b/drivers/gpio/gpio-axp209.c
    new file mode 100644
    index 000000000000..3174799c27c6
    --- /dev/null
    +++ b/drivers/gpio/gpio-axp209.c
    @@ -0,0 +1,162 @@
    +/*
    + * 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");
    --
    2.9.0
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