linux-kernel - Re: [PATCH] pinctrl: stm32: set default gpio line names using pin names

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Date:   Thu, 3 Aug 2023 15:26:26 +0200
From:   Valentin CARON <valentin.caron@...s.st.com>
To:     Linus Walleij <linus.walleij@...aro.org>
CC:     Alexandre TORGUE <alexandre.torgue@...s.st.com>,
        <linux-gpio@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: stm32: set default gpio line names using pin
 names

Hi Linus,

Is the Acked-by from Alexandre enough ?

He is maintainer of arm/stm32 architecture.

Thanks,
Valentin

On 6/21/23 10:18, Alexandre TORGUE wrote:
> Hi
>
> On 6/20/23 12:43, Valentin Caron wrote:
>> Add stm32_pctrl_get_desc_pin_from_gpio function to find a stm32 pin
>> descriptor which is matching with a gpio.
>> Most of the time pin number is equal to pin index in array. So the first
>> part of the function is useful to speed up.
>>
>> And during gpio bank register, we set default gpio names with pin names.
>>
>> Signed-off-by: Valentin Caron <valentin.caron@...s.st.com>
>> ---
>
> Acked-by: Alexandre TORGUE <alexandre.torgue@...s.st.com>
>
>>   drivers/pinctrl/stm32/pinctrl-stm32.c | 35 +++++++++++++++++++++++++++
>>   1 file changed, 35 insertions(+)
>>
>> diff --git a/drivers/pinctrl/stm32/pinctrl-stm32.c 
>> b/drivers/pinctrl/stm32/pinctrl-stm32.c
>> index 4b97bd00191b..eedbb9b97a65 100644
>> --- a/drivers/pinctrl/stm32/pinctrl-stm32.c
>> +++ b/drivers/pinctrl/stm32/pinctrl-stm32.c
>> @@ -1275,6 +1275,28 @@ static const struct pinconf_ops 
>> stm32_pconf_ops = {
>>       .pin_config_dbg_show    = stm32_pconf_dbg_show,
>>   };
>>   +static struct stm32_desc_pin 
>> *stm32_pctrl_get_desc_pin_from_gpio(struct stm32_pinctrl *pctl,
>> +                                 struct stm32_gpio_bank *bank,
>> +                                 unsigned int offset)
>> +{
>> +    unsigned int stm32_pin_nb = bank->bank_nr * 
>> STM32_GPIO_PINS_PER_BANK + offset;
>> +    struct stm32_desc_pin *pin_desc;
>> +    int i;
>> +
>> +    /* With few exceptions (e.g. bank 'Z'), pin number matches with 
>> pin index in array */
>> +    pin_desc = pctl->pins + stm32_pin_nb;
>> +    if (pin_desc->pin.number == stm32_pin_nb)
>> +        return pin_desc;
>> +
>> +    /* Otherwise, loop all array to find the pin with the right 
>> number */
>> +    for (i = 0; i < pctl->npins; i++) {
>> +        pin_desc = pctl->pins + i;
>> +        if (pin_desc->pin.number == stm32_pin_nb)
>> +            return pin_desc;
>> +    }
>> +    return NULL;
>> +}
>> +
>>   static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, 
>> struct fwnode_handle *fwnode)
>>   {
>>       struct stm32_gpio_bank *bank = &pctl->banks[pctl->nbanks];
>> @@ -1285,6 +1307,8 @@ static int stm32_gpiolib_register_bank(struct 
>> stm32_pinctrl *pctl, struct fwnode
>>       struct resource res;
>>       int npins = STM32_GPIO_PINS_PER_BANK;
>>       int bank_nr, err, i = 0;
>> +    struct stm32_desc_pin *stm32_pin;
>> +    char **names;
>>         if (!IS_ERR(bank->rstc))
>>           reset_control_deassert(bank->rstc);
>> @@ -1354,6 +1378,17 @@ static int stm32_gpiolib_register_bank(struct 
>> stm32_pinctrl *pctl, struct fwnode
>>           }
>>       }
>>   +    names = devm_kcalloc(dev, npins, sizeof(char *), GFP_KERNEL);
>> +    for (i = 0; i < npins; i++) {
>> +        stm32_pin = stm32_pctrl_get_desc_pin_from_gpio(pctl, bank, i);
>> +        if (stm32_pin && stm32_pin->pin.name)
>> +            names[i] = devm_kasprintf(dev, GFP_KERNEL, "%s", 
>> stm32_pin->pin.name);
>> +        else
>> +            names[i] = NULL;
>> +    }
>> +
>> +    bank->gpio_chip.names = (const char * const *)names;
>> +
>>       err = gpiochip_add_data(&bank->gpio_chip, bank);
>>       if (err) {
>>           dev_err(dev, "Failed to add gpiochip(%d)!\n", bank_nr);
>