Re: [PATCH v3 2/7] gpiolib: Add support for gpiochipN-based table lookup

[Ulrich Hecht <uli@xxxxxxxx>]

> On November 27, 2019 at 9:42 AM Geert Uytterhoeven <geert+renesas@xxxxxxxxx> wrote:
> 
> 
> Currently GPIO controllers can only be referred to by label in GPIO
> lookup tables.
> 
> Add support for looking them up by "gpiochipN" name, with "N" either the
> corresponding GPIO device's ID number, or the GPIO controller's first
> GPIO number.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> ---
> If this is rejected, the GPIO Aggregator documentation must be updated.
> 
> The second variant is currently used by the legacy sysfs interface only,
> so perhaps the chip->base check should be dropped?
> 
> v3:
>   - New.
> ---
>  drivers/gpio/gpiolib.c | 22 +++++++++++++++++++++-
>  1 file changed, 21 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
> index c9e47620d2434983..d24a3d79dcfe69ad 100644
> --- a/drivers/gpio/gpiolib.c
> +++ b/drivers/gpio/gpiolib.c
> @@ -1746,9 +1746,29 @@ static int gpiochip_match_name(struct gpio_chip *chip, void *data)
>  	return !strcmp(chip->label, name);
>  }
>  
> +static int gpiochip_match_id(struct gpio_chip *chip, void *data)
> +{
> +	int id = (uintptr_t)data;
> +
> +	return id == chip->base || id == chip->gpiodev->id;
> +}
> +
>  static struct gpio_chip *find_chip_by_name(const char *name)
>  {
> -	return gpiochip_find((void *)name, gpiochip_match_name);
> +	struct gpio_chip *chip;
> +	int id;
> +
> +	chip = gpiochip_find((void *)name, gpiochip_match_name);
> +	if (chip)
> +		return chip;
> +
> +	if (!str_has_prefix(name, GPIOCHIP_NAME))
> +		return NULL;
> +
> +	if (kstrtoint(name + strlen(GPIOCHIP_NAME), 10, &id))
> +		return NULL;
> +
> +	return gpiochip_find((void *)(uintptr_t)id, gpiochip_match_id);
>  }
>  
>  #ifdef CONFIG_GPIOLIB_IRQCHIP
> -- 
> 2.17.1
>

Reviewed-by: Ulrich Hecht <uli+renesas@xxxxxxxx>

CU
Uli