[1/5] gpio: moxart: convert to use basic mmio gpio library

From: Kamlakant Patel <kamlakant.patel@linaro.org>

This patch converts MOXART GPIO driver to use basic_mmio_gpio
generic library.

Signed-off-by: Kamlakant Patel <kamlakant.patel@linaro.org>
---
 drivers/gpio/Kconfig       |  1 +
 drivers/gpio/gpio-moxart.c | 76 ++++++++++++++++------------------------------
 2 files changed, 27 insertions(+), 50 deletions(-)

Hi Jonas,

On 3 November 2014 19:38, Jonas Jensen <jonas.jensen@gmail.com> wrote:
> Thanks for keeping this maintained.
>
> I think there's a problem..
>
> RTC is not read on boot: "hctosys: invalid date/time".
> hwclock result in: "Timed out waiting for time change."
>
> Comments and patch suggestion below.
>
>
> On 29 October 2014 14:56,  <kamlakant.patel@linaro.org> wrote:
>>  static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset)
>>  {
>>         struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
>
> to_moxart_gpio() helper is no longer valid here, since bgpio_chip is
> the new container.
>
>
>>  static int moxart_gpio_probe(struct platform_device *pdev)
>>  {
>>         struct device *dev = &pdev->dev;
>>         struct resource *res;
>> +       struct bgpio_chip *bgc;
>>         struct moxart_gpio_chip *mgc;
>>         int ret;
>>
>>         mgc = devm_kzalloc(dev, sizeof(*mgc), GFP_KERNEL);
>>         if (!mgc)
>>                 return -ENOMEM;
>> -       mgc->gpio = moxart_template_chip;
>> +
>> +       bgc = devm_kzalloc(dev, sizeof(*bgc), GFP_KERNEL);
>> +       if (!bgc)
>> +               return -ENOMEM;
>>
>>         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>         mgc->base = devm_ioremap_resource(dev, res);
>>         if (IS_ERR(mgc->base))
>>                 return PTR_ERR(mgc->base);
>>
>> -       mgc->gpio.dev = dev;
>> +       ret = bgpio_init(bgc, dev, 4, mgc->base + GPIO_PIN_DIRECTION,
>> +                   mgc->base + GPIO_DATA_OUT, NULL,
>> +                   mgc->base + GPIO_PIN_DIRECTION, NULL, 0);
>> +
>> +       if (ret) {
>> +               dev_err(&pdev->dev, "bgpio_init failed\n");
>> +               return ret;
>> +       }
>> +
>> +       bgc->gc.label = "moxart-gpio";
>> +       bgc->gc.request = moxart_gpio_request;
>> +       bgc->gc.free = moxart_gpio_free,
>> +       bgc->gc.get = moxart_gpio_get,
>
> End with semicolon?
>
>
>
>  drivers/gpio/Kconfig       |  1 +
>  drivers/gpio/gpio-moxart.c | 84 ++++++++++++++++------------------------------
>  2 files changed, 29 insertions(+), 56 deletions(-)
>
> diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
> index 9de1515..c1b8a90 100644
> --- a/drivers/gpio/Kconfig
> +++ b/drivers/gpio/Kconfig
> @@ -185,6 +185,7 @@ config GPIO_F7188X
>  config GPIO_MOXART
>   bool "MOXART GPIO support"
>   depends on ARCH_MOXART
> + select GPIO_GENERIC
>   help
>    Select this option to enable GPIO driver for
>    MOXA ART SoC devices.
> diff --git a/drivers/gpio/gpio-moxart.c b/drivers/gpio/gpio-moxart.c
> index 4661e18..50278b6 100644
> --- a/drivers/gpio/gpio-moxart.c
> +++ b/drivers/gpio/gpio-moxart.c
> @@ -23,21 +23,23 @@
>  #include <linux/delay.h>
>  #include <linux/timer.h>
>  #include <linux/bitops.h>
> +#include <linux/basic_mmio_gpio.h>
>
>  #define GPIO_DATA_OUT 0x00
>  #define GPIO_DATA_IN 0x04
>  #define GPIO_PIN_DIRECTION 0x08
>
> -struct moxart_gpio_chip {
> - struct gpio_chip gpio;
> +struct moxart_bgpio_chip {
> + struct bgpio_chip gpio;
>   void __iomem *base;
>  };
>
> -static inline struct moxart_gpio_chip *to_moxart_gpio(struct gpio_chip *chip)
> +static inline struct moxart_bgpio_chip *to_moxart_bgpio(struct
> bgpio_chip *chip)
>  {
> - return container_of(chip, struct moxart_gpio_chip, gpio);
> + return container_of(chip, struct moxart_bgpio_chip, gpio);
>  }
>
> +
>  static int moxart_gpio_request(struct gpio_chip *chip, unsigned offset)
>  {
>   return pinctrl_request_gpio(offset);
> @@ -48,23 +50,11 @@ static void moxart_gpio_free(struct gpio_chip
> *chip, unsigned offset)
>   pinctrl_free_gpio(offset);
>  }
>
> -static void moxart_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
> -{
> - struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
> - void __iomem *ioaddr = gc->base + GPIO_DATA_OUT;
> - u32 reg = readl(ioaddr);
> -
> - if (value)
> - reg = reg | BIT(offset);
> - else
> - reg = reg & ~BIT(offset);
> -
> - writel(reg, ioaddr);
> -}
> -
>  static int moxart_gpio_get(struct gpio_chip *chip, unsigned offset)
>  {
> - struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
> + struct bgpio_chip *bgc = to_bgpio_chip(chip);
> + struct moxart_bgpio_chip *gc = to_moxart_bgpio(bgc);
> +
>   u32 ret = readl(gc->base + GPIO_PIN_DIRECTION);
>
>   if (ret & BIT(offset))
> @@ -73,65 +63,47 @@ static int moxart_gpio_get(struct gpio_chip *chip,
> unsigned offset)
>   return !!(readl(gc->base + GPIO_DATA_IN) & BIT(offset));
>  }
>
> -static int moxart_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
> -{
> - struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
> - void __iomem *ioaddr = gc->base + GPIO_PIN_DIRECTION;
> -
> - writel(readl(ioaddr) & ~BIT(offset), ioaddr);
> - return 0;
> -}
> -
> -static int moxart_gpio_direction_output(struct gpio_chip *chip,
> - unsigned offset, int value)
> -{
> - struct moxart_gpio_chip *gc = to_moxart_gpio(chip);
> - void __iomem *ioaddr = gc->base + GPIO_PIN_DIRECTION;
> -
> - moxart_gpio_set(chip, offset, value);
> - writel(readl(ioaddr) | BIT(offset), ioaddr);
> - return 0;
> -}
> -
> -static struct gpio_chip moxart_template_chip = {
> - .label = "moxart-gpio",
> - .request = moxart_gpio_request,
> - .free = moxart_gpio_free,
> - .direction_input = moxart_gpio_direction_input,
> - .direction_output = moxart_gpio_direction_output,
> - .set = moxart_gpio_set,
> - .get = moxart_gpio_get,
> - .ngpio = 32,
> - .owner = THIS_MODULE,
> -};
> -
>  static int moxart_gpio_probe(struct platform_device *pdev)
>  {
>   struct device *dev = &pdev->dev;
>   struct resource *res;
> - struct moxart_gpio_chip *mgc;
> + struct moxart_bgpio_chip *mgc;
>   int ret;
>
>   mgc = devm_kzalloc(dev, sizeof(*mgc), GFP_KERNEL);
>   if (!mgc)
>   return -ENOMEM;
> - mgc->gpio = moxart_template_chip;
>
>   res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>   mgc->base = devm_ioremap_resource(dev, res);
>   if (IS_ERR(mgc->base))
>   return PTR_ERR(mgc->base);
>
> - mgc->gpio.dev = dev;
> + ret = bgpio_init(&mgc->gpio, dev, 4, mgc->base + GPIO_PIN_DIRECTION,
> + mgc->base + GPIO_DATA_OUT, NULL,
> + mgc->base + GPIO_PIN_DIRECTION, NULL, 0);
> +
> + if (ret) {
> + dev_err(&pdev->dev, "bgpio_init failed\n");
> + return ret;
> + }
> +
> + mgc->gpio.gc.label = "moxart-gpio";
> + mgc->gpio.gc.request = moxart_gpio_request;
> + mgc->gpio.gc.free = moxart_gpio_free;
> + mgc->gpio.gc.get = moxart_gpio_get;
> + mgc->gpio.gc.ngpio = 32;
> + mgc->gpio.gc.dev = dev;
> + mgc->gpio.gc.owner = THIS_MODULE;
>
> - ret = gpiochip_add(&mgc->gpio);
> + ret = gpiochip_add(&mgc->gpio.gc);
>   if (ret) {
>   dev_err(dev, "%s: gpiochip_add failed\n",
>   dev->of_node->full_name);
>   return ret;
>   }
>
> - return 0;
> + return ret;
>  }
>
>  static const struct of_device_id moxart_gpio_match[] = {
>

Thanks for the review and comments, I will fix and send a second patch on this.

Thanks,
Kamlakant Patel
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