pinctrl: samsung: add pin_dbg_show callback for debugfs

This patch adds a samsung_pin_dbg_show function to implement the
pin_dbg_show callback function which can be used to show pin
confuration values. Basically, it can show pin setting values by
accessing the "pins" node like below:

$ cat pins
pin 0 (gpy7-0)  CON(0x0) DAT(0x1) PUD(0x1) DRV(0x0) CON_PDN(0x0) PUD_PDN(0x0)

Signed-off-by: Chanho Park <parkch98@gmail.com>
---
 drivers/pinctrl/samsung/pinctrl-samsung.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

On Mon, Mar 26, 2018 at 5:27 PM, Chanho Park <parkch98@gmail.com> wrote:
> This patch adds a samsung_pin_dbg_show function to implement the
> pin_dbg_show callback function which can be used to show pin
> confuration values. Basically, it can show pin setting values by
> accessing the "pins" node like below:
>
> $ cat pins
> pin 0 (gpy7-0)  CON(0x0) DAT(0x1) PUD(0x1) DRV(0x0) CON_PDN(0x0) PUD_PDN(0x0)
>
> Signed-off-by: Chanho Park <parkch98@gmail.com>
> ---
>  drivers/pinctrl/samsung/pinctrl-samsung.c | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
>
> diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
> index 336e88d7bdb9..bdec0cbd64f1 100644
> --- a/drivers/pinctrl/samsung/pinctrl-samsung.c
> +++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
> @@ -279,6 +279,30 @@ static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
>         return 0;
>  }
>
> +#ifdef CONFIG_DEBUG_FS
> +/* Forward declaration which can be used by samsung_pin_dbg_show */
> +static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
> +                               unsigned long *config, bool set);
> +static char *reg_names[] = {"CON", "DAT", "PUD", "DRV", "CON_PDN", "PUD_PDN"};

This should be static const char. Please also add an empty line here.

> +static void samsung_pin_dbg_show(struct pinctrl_dev *pctldev,
> +                               struct seq_file *s, unsigned int pin)
> +{
> +       enum pincfg_type cfg_type;
> +       unsigned long config;
> +       int ret;
> +
> +       for (cfg_type = 0; cfg_type < PINCFG_TYPE_NUM; cfg_type++) {
> +               config = PINCFG_PACK(cfg_type, 0);
> +               ret = samsung_pinconf_rw(pctldev, pin, &config, false);

Use samsung_pinconf_get().

> +               if (ret == -EINVAL)

if (ret < 0)

Best regards,
Krzysztof

> +                       continue;
> +
> +               seq_printf(s, " %s(0x%lx)", reg_names[cfg_type],
> +                          PINCFG_UNPACK_VALUE(config));
> +       }
> +}
> +#endif
> +
>  /* list of pinctrl callbacks for the pinctrl core */
>  static const struct pinctrl_ops samsung_pctrl_ops = {
>         .get_groups_count       = samsung_get_group_count,
> @@ -286,6 +310,9 @@ static const struct pinctrl_ops samsung_pctrl_ops = {
>         .get_group_pins         = samsung_get_group_pins,
>         .dt_node_to_map         = samsung_dt_node_to_map,
>         .dt_free_map            = samsung_dt_free_map,
> +#ifdef CONFIG_DEBUG_FS
> +       .pin_dbg_show           = samsung_pin_dbg_show,
> +#endif
>  };
>
>  /* check if the selector is a valid pin function selector */
> --
> 2.14.1
>
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Hi Krzysztof,


First of all, thanks for your review.


On 03/27/2018 04:07 PM, Krzysztof Kozlowski wrote:
> On Mon, Mar 26, 2018 at 5:27 PM, Chanho Park <parkch98@gmail.com> wrote:
>> This patch adds a samsung_pin_dbg_show function to implement the
>> pin_dbg_show callback function which can be used to show pin
>> confuration values. Basically, it can show pin setting values by
>> accessing the "pins" node like below:
>>
>> $ cat pins
>> pin 0 (gpy7-0)  CON(0x0) DAT(0x1) PUD(0x1) DRV(0x0) CON_PDN(0x0) PUD_PDN(0x0)
>>
>> Signed-off-by: Chanho Park <parkch98@gmail.com>
>> ---
>>   drivers/pinctrl/samsung/pinctrl-samsung.c | 27 +++++++++++++++++++++++++++
>>   1 file changed, 27 insertions(+)
>>
>> diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
>> index 336e88d7bdb9..bdec0cbd64f1 100644
>> --- a/drivers/pinctrl/samsung/pinctrl-samsung.c
>> +++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
>> @@ -279,6 +279,30 @@ static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
>>          return 0;
>>   }
>>
>> +#ifdef CONFIG_DEBUG_FS
>> +/* Forward declaration which can be used by samsung_pin_dbg_show */
>> +static int samsung_pinconf_rw(struct pinctrl_dev *pctldev, unsigned int pin,
>> +                               unsigned long *config, bool set);
>> +static char *reg_names[] = {"CON", "DAT", "PUD", "DRV", "CON_PDN", "PUD_PDN"};
> This should be static const char. Please also add an empty line here.
Okay. I'll fix it and use samsung_pinconf_get forward declaration.
>
>> +static void samsung_pin_dbg_show(struct pinctrl_dev *pctldev,
>> +                               struct seq_file *s, unsigned int pin)
>> +{
>> +       enum pincfg_type cfg_type;
>> +       unsigned long config;
>> +       int ret;
>> +
>> +       for (cfg_type = 0; cfg_type < PINCFG_TYPE_NUM; cfg_type++) {
>> +               config = PINCFG_PACK(cfg_type, 0);
>> +               ret = samsung_pinconf_rw(pctldev, pin, &config, false);
> Use samsung_pinconf_get().
>
>> +               if (ret == -EINVAL)
> if (ret < 0)
Okay. I'll apply this next patch.


Best Regards,
Chanho Park

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