[PATCH] pinctrl: stm32: set default gpio line names using pin names

[PATCH] pinctrl: stm32: set default gpio line names using pin names

[Valentin Caron]

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@foss.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);
-- 
2.25.1

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

[Linus Walleij]

On Tue, Jun 20, 2023 at 12:43 PM Valentin Caron
<valentin.caron@foss.st.com> 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@foss.st.com>

If I get some ACK from the STM32 pinctrl maintainers I can merge
this, seems useful! Maybe you already reviewed it internally at ST?
I personally don't mind if you bring over internal reviewed-by tags.

Yours,
Linus Walleij

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

[Alexandre TORGUE]

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@foss.st.com>
> ---

Acked-by: Alexandre TORGUE <alexandre.torgue@foss.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);

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

[Valentin CARON]

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@foss.st.com>
>> ---
>
> Acked-by: Alexandre TORGUE <alexandre.torgue@foss.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);
>

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

[Linus Walleij]

On Tue, Jun 20, 2023 at 12:43 PM Valentin Caron
<valentin.caron@foss.st.com> 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@foss.st.com>

Patch applied!

Yours,
Linus Walleij