Subject: [PATCH] gpio: pl061: hook request if gpio-ranges avaiable

From: [email-masked] (k00278426)
Date: Thu, 9 Oct 2014 19:15:52 +0800

hi jian
  
     In the afternoon,we submit a patch about gpio-ranges item,we slove this issue by setting the .request pointer which is null. before coming true the

pl061_gpio_request function, we slove the issue.you can study it.

Best Regards
xinwei 

On 2014/10/9 18:56, Haojian Zhuang wrote:
> Hi Xinwei,
>
> Do I miss anything? At here, .request pointer isn't null. It always
> points to pl061_gpio_request().
>
> Best Regards
> Haojian
>
> On 9 October 2014 18:38, k00278426 <[email-masked]> wrote:
>> On 2014/10/9 17:42, Haojian Zhuang wrote:
>>
>> gpio-ranges property could binds gpio to pinctrl. But there may be some
>> gpios without pinctrl operation. So check whether gpio-ranges property
>> exists in device node first.
>>
>> Signed-off-by: Haojian Zhuang <[email-masked]>
>> ---
>>  drivers/gpio/gpio-pl061.c | 21 +++++++++++++++------
>>  1 file changed, 15 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
>> index 84b49cf..d1813f0 100644
>> --- a/drivers/gpio/gpio-pl061.c
>> +++ b/drivers/gpio/gpio-pl061.c
>> @@ -52,28 +52,34 @@ struct pl061_gpio {
>>
>>   void __iomem *base;
>>   struct gpio_chip gc;
>> + int uses_pinctrl;
>>
>>  #ifdef CONFIG_PM
>>   struct pl061_context_save_regs csave_regs;
>>  #endif
>>  };
>>
>> -static int pl061_gpio_request(struct gpio_chip *chip, unsigned offset)
>> +static int pl061_gpio_request(struct gpio_chip *gc, unsigned offset)
>>  {
>>   /*
>>   * Map back to global GPIO space and request muxing, the direction
>>   * parameter does not matter for this controller.
>>   */
>> - int gpio = chip->base + offset;
>> + struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
>> + int gpio = gc->base + offset;
>>
>> - return pinctrl_request_gpio(gpio);
>> + if (chip->uses_pinctrl)
>> + return pinctrl_request_gpio(gpio);
>> + return 0;
>>  }
>>
>>        In the request_gpio process,if the .request point is null,the  return
>> of request_gpio process will value 0. the request_gpio process will not
>> enter the pintrcl system.
>>   so the request_gpio have deal with the "if" branch.
>>
>>
>> -static void pl061_gpio_free(struct gpio_chip *chip, unsigned offset)
>> +static void pl061_gpio_free(struct gpio_chip *gc, unsigned offset)
>>  {
>> - int gpio = chip->base + offset;
>> + struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
>> + int gpio = gc->base + offset;
>>
>> - pinctrl_free_gpio(gpio);
>> + if (chip->uses_pinctrl)
>> + pinctrl_free_gpio(gpio);
>>  }
>>
>>  static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
>> @@ -264,6 +270,9 @@ static int pl061_probe(struct amba_device *adev, const
>> struct amba_id *id)
>>
>>   spin_lock_init(&chip->lock);
>>
>> + /* Hook the request()/free() for pinctrl operation */
>> + if (of_property_read_bool(dev->of_node, "gpio-ranges"))
>> + chip->uses_pinctrl = true;
>>   chip->gc.request = pl061_gpio_request;
>>   chip->gc.free = pl061_gpio_free;
>>   chip->gc.direction_input = pl061_direction_input;
>>
>>
> .
>