Re: [PATCH v3 5/5] gpio: tps65912: Add GPIO driver for the TPS65912 PMIC

[Alexandre Courbot]

On Thu, Sep 24, 2015 at 11:52 PM, Andrew F. Davis <afd@xxxxxx> wrote:
> This patch adds support for the TPS65912 PMIC GPIOs.
>
> TPS65912 has five configurable GPIOs that can be used for several
> purposes.
>
> Signed-off-by: Andrew F. Davis <afd@xxxxxx>
> ---
>  drivers/gpio/Kconfig         |   6 ++
>  drivers/gpio/Makefile        |   1 +
>  drivers/gpio/gpio-tps65912.c | 138 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 145 insertions(+)
>  create mode 100644 drivers/gpio/gpio-tps65912.c
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index fb28483..82218fa 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -838,6 +838,12 @@ config GPIO_TPS65910
>           Select this option to enable GPIO driver for the TPS65910
>           chip family.
>
> +config GPIO_TPS65912
> +       tristate "TI TPS65912 GPIO"
> +       depends on MFD_TPS65912
> +       help
> +         This driver supports TPS65912 gpio chip
> +
>  config GPIO_TWL4030
>         tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
>         depends on TWL4030_CORE
> diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
> index 605bf89..f79a7c4 100644
> --- a/drivers/gpio/Makefile
> +++ b/drivers/gpio/Makefile
> @@ -96,6 +96,7 @@ obj-$(CONFIG_GPIO_TIMBERDALE) += gpio-timberdale.o
>  obj-$(CONFIG_GPIO_PALMAS)      += gpio-palmas.o
>  obj-$(CONFIG_GPIO_TPS6586X)    += gpio-tps6586x.o
>  obj-$(CONFIG_GPIO_TPS65910)    += gpio-tps65910.o
> +obj-$(CONFIG_GPIO_TPS65912)    += gpio-tps65912.o
>  obj-$(CONFIG_GPIO_TS5500)      += gpio-ts5500.o
>  obj-$(CONFIG_GPIO_TWL4030)     += gpio-twl4030.o
>  obj-$(CONFIG_GPIO_TWL6040)     += gpio-twl6040.o
> diff --git a/drivers/gpio/gpio-tps65912.c b/drivers/gpio/gpio-tps65912.c
> new file mode 100644
> index 0000000..4707e62
> --- /dev/null
> +++ b/drivers/gpio/gpio-tps65912.c
> @@ -0,0 +1,138 @@
> +/*
> + * TI TPS65912x GPIO Driver
> + *
> + * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/
> + *
> + * Author: Andrew F. Davis <afd@xxxxxx>
> + *
> + * 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 Arizona GPIO driver and the previous TPS65912 driver by
> + * Margarita Olaya Cabrera <magi@xxxxxxxxxxxxxxx>
> + */
> +
> +#include <linux/gpio.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +
> +#include <linux/mfd/tps65912.h>
> +
> +struct tps65912_gpio {
> +       struct tps65912 *tps;
> +       struct gpio_chip gpio_chip;

Nit: I'd suggest to put gpio_chip as the first member of your struct
so that to_gpio() resolves to the same address. This may make the
generated code neglectably smaller and faster.

> +};
> +
> +#define to_gpio(gc) container_of(gc, struct tps65912_gpio, gpio_chip)

Nit2: Maybe a more specific name (like tps_gpio()) would be better?
It's local to this file though, so not a big deal.

> +
> +static int tps65912_gpio_get(struct gpio_chip *gc, unsigned offset)
> +{
> +       struct tps65912_gpio *gpio = to_gpio(gc);
> +       int ret, val;
> +
> +       ret = regmap_read(gpio->tps->regmap, TPS65912_GPIO1 + offset, &val);
> +       if (ret < 0)
> +               return ret;
> +
> +       return val & GPIO_STS_MASK;
> +}
> +
> +static void tps65912_gpio_set(struct gpio_chip *gc, unsigned offset,
> +                             int value)
> +{
> +       struct tps65912_gpio *gpio = to_gpio(gc);
> +
> +       regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
> +                          GPIO_SET_MASK, value ? GPIO_SET_MASK : 0);
> +}
> +
> +static int tps65912_gpio_output(struct gpio_chip *gc, unsigned offset,
> +                               int value)
> +{
> +       struct tps65912_gpio *gpio = to_gpio(gc);
> +
> +       /* Set the initial value */
> +       tps65912_gpio_set(gc, offset, value);
> +
> +       return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
> +                                 GPIO_CFG_MASK, GPIO_CFG_MASK);
> +}
> +
> +static int tps65912_gpio_input(struct gpio_chip *gc, unsigned offset)
> +{
> +       struct tps65912_gpio *gpio = to_gpio(gc);
> +
> +       return regmap_update_bits(gpio->tps->regmap, TPS65912_GPIO1 + offset,
> +                                 GPIO_CFG_MASK, 0);
> +}
> +
> +static const struct of_device_id tps65912_gpio_of_match_table[] = {
> +       { .compatible = "ti,tps65912-gpio", },
> +       { /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, tps65912_gpio_of_match_table);
> +
> +static struct gpio_chip template_chip = {
> +       .label                  = "tps65912-gpio",
> +       .owner                  = THIS_MODULE,
> +       .direction_input        = tps65912_gpio_input,
> +       .direction_output       = tps65912_gpio_output,
> +       .get                    = tps65912_gpio_get,
> +       .set                    = tps65912_gpio_set,
> +       .can_sleep              = true,
> +       .ngpio                  = 5,
> +       .base                   = -1,
> +};
> +
> +static int tps65912_gpio_probe(struct platform_device *pdev)
> +{
> +       struct tps65912_gpio *gpio;
> +       int ret;
> +
> +       gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL);
> +       if (!gpio)
> +               return -ENOMEM;
> +
> +       gpio->tps = dev_get_drvdata(pdev->dev.parent);
> +       gpio->gpio_chip = template_chip;
> +       ret = gpiochip_add(&gpio->gpio_chip);
> +       if (ret < 0) {
> +               dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret);
> +               return ret;
> +       }
> +
> +       platform_set_drvdata(pdev, gpio);
> +
> +       return 0;
> +}
> +
> +static int tps65912_gpio_remove(struct platform_device *pdev)
> +{
> +       struct tps65912_gpio *gpio = platform_get_drvdata(pdev);
> +
> +       gpiochip_remove(&gpio->gpio_chip);
> +
> +       return 0;
> +}
> +
> +static struct platform_driver tps65912_gpio_driver = {
> +       .driver = {
> +               .name = "tps65912-gpio",
> +               .of_match_table = tps65912_gpio_of_match_table,
> +       },
> +       .probe = tps65912_gpio_probe,
> +       .remove = tps65912_gpio_remove,
> +};
> +
> +module_platform_driver(tps65912_gpio_driver);
> +
> +MODULE_AUTHOR("Andrew F. Davis <afd@xxxxxx>");
> +MODULE_DESCRIPTION("TPS65912 GPIO driver");
> +MODULE_ALIAS("platform:tps65912-gpio");
> +MODULE_LICENSE("GPL v2");

Nice and simple driver - my remarks above should not be taken as a
call to re-spin, just consider them if you need to send another
version of this patchset.

Reviewed-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
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