That enum adds a "keep" state which permits to tell the driver trough its platform data not to touch the hardware during the probe.
Cc: Richard Purdie <[email protected]> Cc: Jingoo Han <[email protected]> Cc: Laurent Pinchart <[email protected]> Cc: Rob Herring <[email protected]> Cc: Pawel Moll <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Stephen Warren <[email protected]> Cc: Ian Campbell <[email protected]> Cc: [email protected] Cc: Sascha Hauer <[email protected]> Cc: [email protected] Cc: Lothar Waßmann <[email protected]> Cc: Jean-Christophe Plagniol-Villard <[email protected]> Cc: Thierry Reding <[email protected]> Cc: Eric Bénard <[email protected]> Signed-off-by: Denis Carikli <[email protected]> --- ChangeLog v5->v6: - New patch. --- drivers/video/backlight/gpio_backlight.c | 7 +++++-- include/linux/platform_data/gpio_backlight.h | 6 ++++++ 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c index 81fb127..6ddeba9 100644 --- a/drivers/video/backlight/gpio_backlight.c +++ b/drivers/video/backlight/gpio_backlight.c @@ -23,6 +23,7 @@ struct gpio_backlight { int gpio; int active; + enum gpio_backlight_default_state def_value; }; static int gpio_backlight_update_status(struct backlight_device *bl) @@ -103,8 +104,10 @@ static int gpio_backlight_probe(struct platform_device *pdev) return PTR_ERR(bl); } - bl->props.brightness = pdata->def_value; - backlight_update_status(bl); + if (pdata->def_value != BACKLIGHT_GPIO_DEFSTATE_KEEP) { + bl->props.brightness = pdata->def_value; + backlight_update_status(bl); + } platform_set_drvdata(pdev, bl); return 0; diff --git a/include/linux/platform_data/gpio_backlight.h b/include/linux/platform_data/gpio_backlight.h index 5ae0d9c..3b437b3 100644 --- a/include/linux/platform_data/gpio_backlight.h +++ b/include/linux/platform_data/gpio_backlight.h @@ -10,6 +10,12 @@ struct device; +enum gpio_backlight_default_state { + BACKLIGHT_GPIO_DEFSTATE_OFF, + BACKLIGHT_GPIO_DEFSTATE_ON, + BACKLIGHT_GPIO_DEFSTATE_KEEP, +}; + struct gpio_backlight_platform_data { struct device *fbdev; int gpio; -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
