Messages in this thread |  | | Subject | Re: [PATCH 2/2] backlight: gpio: delete pdata inversion | From | Daniel Thompson <> | Date | Tue, 23 May 2017 15:15:01 +0100 |
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On 30/04/17 09:17, Linus Walleij wrote: > The option to invert the output of the GPIO (active low) is > not used by the only platform still using platform data to > set up a GPIO backlight (one SH board). Delete the option > as we do not expect to expand the use of board files for > this driver, and GPIO descriptors intrinsically keep track > of any signal inversion. > > Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
I note that only ~40% of Linux architectures currently have DT support at this point... There are still a few "embedded" ones that make do with platform bus (although they are growing increasingly niche).
Having said that I can't argue with "it's not used anywhere" (I've only really posted the above paragraph as a hint for future archeology... since it might be me doing the digging): Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
Daniel.
> --- > drivers/video/backlight/gpio_backlight.c | 15 ++------------- > include/linux/platform_data/gpio_backlight.h | 1 - > 2 files changed, 2 insertions(+), 14 deletions(-) > > diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c > index 17dd8071ad4d..8c19dc6c9236 100644 > --- a/drivers/video/backlight/gpio_backlight.c > +++ b/drivers/video/backlight/gpio_backlight.c > @@ -25,7 +25,6 @@ struct gpio_backlight { > struct device *fbdev; > > struct gpio_desc *gpiod; > - int active; > int def_value; > }; > > @@ -39,8 +38,7 @@ static int gpio_backlight_update_status(struct backlight_device *bl) > bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) > brightness = 0; > > - gpiod_set_value_cansleep(gbl->gpiod, > - brightness ? gbl->active : !gbl->active); > + gpiod_set_value_cansleep(gbl->gpiod, brightness); > > return 0; > } > @@ -72,8 +70,6 @@ static int gpio_backlight_probe_dt(struct platform_device *pdev, > flags = GPIOD_OUT_HIGH; > else > flags = GPIOD_OUT_LOW; > - /* GPIO descriptors keep track of inversion */ > - gbl->active = 1; > > gbl->gpiod = devm_gpiod_get(dev, NULL, flags); > if (IS_ERR(gbl->gpiod)) { > @@ -124,15 +120,8 @@ static int gpio_backlight_probe(struct platform_device *pdev) > unsigned long flags = GPIOF_DIR_OUT; > > gbl->fbdev = pdata->fbdev; > - gbl->active = pdata->active_low ? 0 : 1; > gbl->def_value = pdata->def_value; > - > - if (gbl->active) > - flags |= gbl->def_value ? > - GPIOF_INIT_HIGH : GPIOF_INIT_LOW; > - else > - flags |= gbl->def_value ? > - GPIOF_INIT_LOW : GPIOF_INIT_HIGH; > + flags |= gbl->def_value ? GPIOF_INIT_HIGH : GPIOF_INIT_LOW; > > ret = devm_gpio_request_one(gbl->dev, pdata->gpio, flags, > pdata ? pdata->name : "backlight"); > diff --git a/include/linux/platform_data/gpio_backlight.h b/include/linux/platform_data/gpio_backlight.h > index 5ae0d9c80d4d..683d90453c41 100644 > --- a/include/linux/platform_data/gpio_backlight.h > +++ b/include/linux/platform_data/gpio_backlight.h > @@ -14,7 +14,6 @@ struct gpio_backlight_platform_data { > struct device *fbdev; > int gpio; > int def_value; > - bool active_low; > const char *name; > }; > >
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