linux-kernel - Re: [PATCH v3 4/6] pinctrl: meson: Rework enable/disable bias part

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Message-ID: <c3246e0e-897f-4139-91da-5850a596c713@baylibre.com>
Date:   Thu, 9 May 2019 13:25:33 +0200
From:   guillaume La Roque <glaroque@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     linus.walleij@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        khilman@...libre.com, linux-gpio@...r.kernel.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 4/6] pinctrl: meson: Rework enable/disable bias part

hi Martin,

same as previous patch i will do a new serie with your comments.


On 5/7/19 7:53 PM, Martin Blumenstingl wrote:
> Hi Guillaume,
>
> On Tue, May 7, 2019 at 1:57 PM Guillaume La Roque <glaroque@...libre.com> wrote:
>> rework bias enable/disable part to prepare drive-strength integration
> if it was my patch I would add "no functional changes" at the end to
> make it explicit that this only changes the structure of the code.
>
>> Signed-off-by: Guillaume La Roque <glaroque@...libre.com>
> with the minor comments from below addressed:
> Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
>
>> ---
>>  drivers/pinctrl/meson/pinctrl-meson.c | 79 ++++++++++++++++-----------
>>  1 file changed, 48 insertions(+), 31 deletions(-)
>>
>> diff --git a/drivers/pinctrl/meson/pinctrl-meson.c b/drivers/pinctrl/meson/pinctrl-meson.c
>> index 96a4a72708e4..a216a7537564 100644
>> --- a/drivers/pinctrl/meson/pinctrl-meson.c
>> +++ b/drivers/pinctrl/meson/pinctrl-meson.c
>> @@ -174,13 +174,57 @@ int meson_pmx_get_groups(struct pinctrl_dev *pcdev, unsigned selector,
>>         return 0;
>>  }
>>
>> +static int meson_pinconf_disable_bias(struct meson_pinctrl *pc,
>> +                                     unsigned int pin)
>> +{
>> +       struct meson_bank *bank;
>> +       unsigned int reg, bit = 0;
>> +       int ret;
>> +
>> +       ret = meson_get_bank(pc, pin, &bank);
>> +       if (ret)
>> +               return ret;
> add an empty line here to keep it consistent with the rest of the code
>
> [...]
>>  static int meson_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin,
>>                              unsigned long *configs, unsigned num_configs)
>>  {
>>         struct meson_pinctrl *pc = pinctrl_dev_get_drvdata(pcdev);
>>         struct meson_bank *bank;
> bank is not read anymore (it's passed to meson_get_bank to set it, but
> then it's not read, which is probably why my compiler doesn't
> complain)
>
>>         enum pin_config_param param;
>> -       unsigned int reg, bit;
>>         int i, ret;
>>
>>         ret = meson_get_bank(pc, pin, &bank);
>> @@ -192,44 +236,17 @@ static int meson_pinconf_set(struct pinctrl_dev *pcdev, unsigned int pin,
>>
>>                 switch (param) {
>>                 case PIN_CONFIG_BIAS_DISABLE:
>> -                       dev_dbg(pc->dev, "pin %u: disable bias\n", pin);
>> -
>> -                       meson_calc_reg_and_bit(bank, pin, REG_PULLEN, &reg,
>> -                                              &bit);
>> -                       ret = regmap_update_bits(pc->reg_pullen, reg,
>> -                                                BIT(bit), 0);
>> +                       ret = meson_pinconf_disable_bias(pc, pin);
>>                         if (ret)
>>                                 return ret;
>>                         break;
>>                 case PIN_CONFIG_BIAS_PULL_UP:
>> -                       dev_dbg(pc->dev, "pin %u: enable pull-up\n", pin);
>> -
>> -                       meson_calc_reg_and_bit(bank, pin, REG_PULLEN,
>> -                                              &reg, &bit);
>> -                       ret = regmap_update_bits(pc->reg_pullen, reg,
>> -                                                BIT(bit), BIT(bit));
>> -                       if (ret)
>> -                               return ret;
>> -
>> -                       meson_calc_reg_and_bit(bank, pin, REG_PULL, &reg, &bit);
>> -                       ret = regmap_update_bits(pc->reg_pull, reg,
>> -                                                BIT(bit), BIT(bit));
>> +                       ret = meson_pinconf_enable_bias(pc, pin, 1);
> use "true" instead of "1"?
>
>>                         if (ret)
>>                                 return ret;
>>                         break;
>>                 case PIN_CONFIG_BIAS_PULL_DOWN:
>> -                       dev_dbg(pc->dev, "pin %u: enable pull-down\n", pin);
>> -
>> -                       meson_calc_reg_and_bit(bank, pin, REG_PULLEN,
>> -                                              &reg, &bit);
>> -                       ret = regmap_update_bits(pc->reg_pullen, reg,
>> -                                                BIT(bit), BIT(bit));
>> -                       if (ret)
>> -                               return ret;
>> -
>> -                       meson_calc_reg_and_bit(bank, pin, REG_PULL, &reg, &bit);
>> -                       ret = regmap_update_bits(pc->reg_pull, reg,
>> -                                                BIT(bit), 0);
>> +                       ret = meson_pinconf_enable_bias(pc, pin, 0);
> use "false" instead of "0"?
>
> one overall comment: thank you for working on this!
> in my opinion it's a good preparation step to ensure that
> meson_pinconf_set is easy to understand even if we add more
> functionality here
>
>
> Regards
> Martin


guillaume