linux-kernel - Re: [PATCH] drivers: iio: dac: ad5592r: add gpio

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Date:   Wed, 23 Nov 2022 20:48:32 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Antoniu Miclaus <antoniu.miclaus@...log.com>
Cc:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers: iio: dac: ad5592r: add gpio_chip names

On Thu, 17 Nov 2022 11:01:30 +0200
Antoniu Miclaus <antoniu.miclaus@...log.com> wrote:

> Add array of explicit gpio names for the `gpiochip` structure of
> ad5592r, mainly for debug purposes.
Can you give an example of when this is more useful than the offset?
(which I'm assuming is also available when debugging?)

Jonathan

> 
> Since the gpios are configurable via the dts, generic names are
> used.
> 
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
> ---
>  drivers/iio/dac/ad5592r-base.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/iio/dac/ad5592r-base.c b/drivers/iio/dac/ad5592r-base.c
> index 7a9b5fc1e579..076bc9ecfb49 100644
> --- a/drivers/iio/dac/ad5592r-base.c
> +++ b/drivers/iio/dac/ad5592r-base.c
> @@ -124,6 +124,10 @@ static int ad5592r_gpio_request(struct gpio_chip *chip, unsigned offset)
>  	return 0;
>  }
>  
> +static const char * const ad5592r_gpio_names[] = {
> +	"GPIO0", "GPIO1", "GPIO2", "GPIO3", "GPIO4", "GPIO5", "GPIO6", "GPIO7",
> +};
> +
>  static int ad5592r_gpio_init(struct ad5592r_state *st)
>  {
>  	if (!st->gpio_map)
> @@ -140,6 +144,7 @@ static int ad5592r_gpio_init(struct ad5592r_state *st)
>  	st->gpiochip.set = ad5592r_gpio_set;
>  	st->gpiochip.request = ad5592r_gpio_request;
>  	st->gpiochip.owner = THIS_MODULE;
> +	st->gpiochip.names = ad5592r_gpio_names;
>  
>  	mutex_init(&st->gpio_lock);
>