On Wed, Oct 31, 2012 at 05:57:27PM +0200, Pantelis Antoniou wrote:
> Enable pinctrl for pwm-backlight.
>
> Signed-off-by: Pantelis Antoniou <pa...@antoniou-consulting.com>
> ---
> drivers/video/backlight/pwm_bl.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/video/backlight/pwm_bl.c
> b/drivers/video/backlight/pwm_bl.c
> index 0c91023..f3b6194 100644
> --- a/drivers/video/backlight/pwm_bl.c
> +++ b/drivers/video/backlight/pwm_bl.c
> @@ -20,6 +20,8 @@
> #include <linux/pwm.h>
> #include <linux/pwm_backlight.h>
> #include <linux/slab.h>
> +#include <linux/pinctrl/consumer.h>
> +#include <linux/err.h>
>
> struct pwm_bl_data {
> struct pwm_device *pwm;
> @@ -180,9 +182,14 @@ static int pwm_backlight_probe(struct platform_device
> *pdev)
> struct backlight_properties props;
> struct backlight_device *bl;
> struct pwm_bl_data *pb;
> + struct pinctrl *pinctrl;
> unsigned int max;
> int ret;
>
> + pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
> + if (IS_ERR(pinctrl))
> + dev_warn(&pdev->dev, "unable to select pin group\n");
> +
I just saw this done in a similar way in some other driver and then
remembered your patch. When I reviewed this I wasn't sure if a warning
was good enough in this case. I've checked the kernel tree and it seems
like a majority handled this as failure instead of a warning. I took a
look at the pinctrl core and it seems like indeed if neither pinctrl is
enabled or if there isn't actually a pinmux configuration for a device,
then devm_pinctrl_get_select_default() will actually not return an
error, so in those cases where an error is returned it should actually
be handled as a fatal error.
I'm Cc'ing Linus Walleij, maybe he knows what to do.
Thierry
> if (!data) {
> ret = pwm_backlight_parse_dt(&pdev->dev, &defdata);
> if (ret < 0) {
> --
> 1.7.12
>
>
>
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