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Message-ID: <20160126140312.GB3368@x1>
Date: Tue, 26 Jan 2016 14:03:12 +0000
From: Lee Jones <lee.jones@...aro.org>
To: "Andrew F. Davis" <afd@...com>
Cc: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Linus Walleij <linus.walleij@...aro.org>,
Alexandre Courbot <gnurou@...il.com>,
Samuel Ortiz <sameo@...ux.intel.com>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, devicetree@...r.kernel.org,
linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 3/3] gpio: tps65086: Add GPO driver for the TPS65086
PMIC
On Mon, 25 Jan 2016, Andrew F. Davis wrote:
> Add support for the TPS65086 PMIC GPOs.
>
> TPS65086 has four configurable GPOs that can be used for several
> purposes. These are output only.
>
> Signed-off-by: Andrew F. Davis <afd@...com>
> ---
> drivers/gpio/Kconfig | 6 ++
> drivers/gpio/Makefile | 1 +
> drivers/gpio/gpio-tps65086.c | 144 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 151 insertions(+)
> create mode 100644 drivers/gpio/gpio-tps65086.c
Is this patch orthogonal to the other two in the set, or do they all
need to go in together?
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index c88dd24..e35e120 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -844,6 +844,12 @@ config GPIO_TIMBERDALE
> ---help---
> Add support for the GPIO IP in the timberdale FPGA.
>
> +config GPIO_TPS65086
> + tristate "TI TPS65086 GPO"
> + depends on MFD_TPS65086
> + help
> + This driver supports the GPO on TI TPS65086x PMICs.
> +
> config GPIO_TPS6586X
> bool "TPS6586X GPIO"
> depends on MFD_TPS6586X
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index ece7d7c..c759190 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -95,6 +95,7 @@ obj-$(CONFIG_GPIO_TC3589X) += gpio-tc3589x.o
> obj-$(CONFIG_ARCH_TEGRA) += gpio-tegra.o
> obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o
> obj-$(CONFIG_GPIO_PALMAS) += gpio-palmas.o
> +obj-$(CONFIG_GPIO_TPS65086) += gpio-tps65086.o
> obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
> obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
> obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o
> diff --git a/drivers/gpio/gpio-tps65086.c b/drivers/gpio/gpio-tps65086.c
> new file mode 100644
> index 0000000..d5d9e47
> --- /dev/null
> +++ b/drivers/gpio/gpio-tps65086.c
> @@ -0,0 +1,144 @@
> +/*
> + * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
> + * Andrew F. Davis <afd@...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 "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether expressed or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License version 2 for more details.
> + *
> + * Based on the TPS65912 driver
> + */
> +
> +#include <linux/gpio.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +#include <linux/mfd/tps65086.h>
> +
> +struct tps65086_gpio {
> + struct gpio_chip chip;
> + struct tps65086 *tps;
> +};
> +
> +static inline struct tps65086_gpio *to_tps65086_gpio(struct gpio_chip *chip)
> +{
> + return container_of(chip, struct tps65086_gpio, chip);
> +}
> +
> +static int tps65086_gpio_get_direction(struct gpio_chip *chip,
> + unsigned offset)
> +{
> + /* This device is output only */
> + return 0;
> +}
> +
> +static int tps65086_gpio_direction_input(struct gpio_chip *chip,
> + unsigned offset)
> +{
> + /* This device is output only */
> + return -EINVAL;
> +}
> +
> +static int tps65086_gpio_direction_output(struct gpio_chip *chip,
> + unsigned offset, int value)
> +{
> + struct tps65086_gpio *gpio = to_tps65086_gpio(chip);
> +
> + /* Set the initial value */
> + regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
> + BIT(4 + offset), value ? BIT(4 + offset) : 0);
> +
> + return 0;
> +}
> +
> +static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset)
> +{
> + struct tps65086_gpio *gpio = to_tps65086_gpio(chip);
> + int ret, val;
> +
> + ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val);
> + if (ret < 0)
> + return ret;
> +
> + return val & BIT(4 + offset);
> +}
> +
> +static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset,
> + int value)
> +{
> + struct tps65086_gpio *gpio = to_tps65086_gpio(chip);
> +
> + regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL,
> + BIT(4 + offset), value ? BIT(4 + offset) : 0);
> +}
> +
> +static struct gpio_chip template_chip = {
> + .label = "tps65086-gpio",
> + .owner = THIS_MODULE,
> + .get_direction = tps65086_gpio_get_direction,
> + .direction_input = tps65086_gpio_direction_input,
> + .direction_output = tps65086_gpio_direction_output,
> + .get = tps65086_gpio_get,
> + .set = tps65086_gpio_set,
> + .base = -1,
> + .ngpio = 4,
> + .can_sleep = true,
> +};
> +
> +static int tps65086_gpio_probe(struct platform_device *pdev)
> +{
> + struct tps65086_gpio *gpio;
> + int ret;
> +
> + gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
> + if (!gpio)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, gpio);
> +
> + gpio->tps = dev_get_drvdata(pdev->dev.parent);
> + gpio->chip = template_chip;
> + gpio->chip.parent = gpio->tps->dev;
> +
> + ret = gpiochip_add(&gpio->chip);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int tps65086_gpio_remove(struct platform_device *pdev)
> +{
> + struct tps65086_gpio *gpio = platform_get_drvdata(pdev);
> +
> + gpiochip_remove(&gpio->chip);
> +
> + return 0;
> +}
> +
> +static const struct platform_device_id tps65086_gpio_id_table[] = {
> + { "tps65086-gpio", },
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table);
> +
> +static struct platform_driver tps65086_gpio_driver = {
> + .driver = {
> + .name = "tps65086-gpio",
> + },
> + .probe = tps65086_gpio_probe,
> + .remove = tps65086_gpio_remove,
> + .id_table = tps65086_gpio_id_table,
> +};
> +module_platform_driver(tps65086_gpio_driver);
> +
> +MODULE_AUTHOR("Andrew F. Davis <afd@...com>");
> +MODULE_DESCRIPTION("TPS65086 GPIO driver");
> +MODULE_LICENSE("GPL v2");
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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