gpio: pl061: hook request if gpio-ranges avaiable

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 <haojian.zhuang@linaro.org>
---
 drivers/gpio/gpio-pl061.c | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

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 <kong.kongxinwei@hisilicon.com> 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 <haojian.zhuang@linaro.org>
> ---
>  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;
>
>
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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 <kong.kongxinwei@hisilicon.com> 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 <haojian.zhuang@linaro.org>
>> ---
>>  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;
>>
>>
> .
>


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It's good. But it's similar the one that I sent in last year. You can
check this link in below.

http://marc.info/?l=linux-gpio&m=138300092720593&w=2

My patch is used to fix this issue according to the comments.

Best Regards
Haojian

On 9 October 2014 19:15, k00278426 <kong.kongxinwei@hisilicon.com> wrote:
> 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 <kong.kongxinwei@hisilicon.com> 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 <haojian.zhuang@linaro.org>
>>> ---
>>>  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;
>>>
>>>
>> .
>>
>
>
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On Thu, Oct 9, 2014 at 6:42 PM, Haojian Zhuang
<haojian.zhuang@linaro.org> 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 <haojian.zhuang@linaro.org>
> ---
>  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;
>  }
>
> -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;

You probably want to document this property in
Documentation/devicetree/bindings/gpio/pl061-gpio.txt.
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