| Message ID | 1402052529-22761-1-git-send-email-LW@KARO-electronics.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Fri, 06 Jun 2014, Lothar Waßmann wrote: > commit 257462dbf3ed pwm-backlight: switch to gpiod interface > introduced a regression leading to acquiring a bogus GPIO-0 when > configured from DT without an 'enable-gpios' property. > The driver will happily accept the 0 initialized 'enable_gpio' member > of the struct platform_pwm_backlight_data as valid gpio number, and > request this GPIO as enable pin. In case of multiple driver instances, > the second will fail to register with the error message: > pwm-backlight backlight1.23: failed to request GPIO#0: -16 > > Fix this by setting enable_gpio in the pdata struct to -EINVAL. > > Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> > --- > drivers/video/backlight/pwm_bl.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c > index 38ca88b..3d265c4 100644 > --- a/drivers/video/backlight/pwm_bl.c > +++ b/drivers/video/backlight/pwm_bl.c > @@ -178,7 +178,7 @@ static int pwm_backlight_parse_dt(struct device *dev, > data->dft_brightness = value; > data->max_brightness--; > } > - > + data->enable_gpio = -EINVAL; > return 0; > } This patch doesn't look like it will apply. I suggest you pull v3.17-rc1 when it lands and rebase your patch.
diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 38ca88b..3d265c4 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -178,7 +178,7 @@ static int pwm_backlight_parse_dt(struct device *dev, data->dft_brightness = value; data->max_brightness--; } - + data->enable_gpio = -EINVAL; return 0; }
commit 257462dbf3ed pwm-backlight: switch to gpiod interface introduced a regression leading to acquiring a bogus GPIO-0 when configured from DT without an 'enable-gpios' property. The driver will happily accept the 0 initialized 'enable_gpio' member of the struct platform_pwm_backlight_data as valid gpio number, and request this GPIO as enable pin. In case of multiple driver instances, the second will fail to register with the error message: pwm-backlight backlight1.23: failed to request GPIO#0: -16 Fix this by setting enable_gpio in the pdata struct to -EINVAL. Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de> --- drivers/video/backlight/pwm_bl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)