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Message-ID: <20190710123932.28244-1-jjhiblot@ti.com>
Date: Wed, 10 Jul 2019 14:39:28 +0200
From: Jean-Jacques Hiblot <jjhiblot@...com>
To: <jacek.anaszewski@...il.com>, <pavel@....cz>, <robh+dt@...nel.org>,
<mark.rutland@....com>, <lee.jones@...aro.org>,
<daniel.thompson@...aro.org>, <jingoohan1@...il.com>
CC: <dmurphy@...com>, <linux-leds@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
<tomi.valkeinen@...com>, Jean-Jacques Hiblot <jjhiblot@...com>
Subject: [PATCH v3 0/4] Add a generic driver for LED-based backlight
This series aims to add a led-backlight driver, similar to pwm-backlight,
but using a LED class device underneath.
A few years ago (2015), Tomi Valkeinen posted a series implementing a
backlight driver on top of a LED device:
https://patchwork.kernel.org/patch/7293991/
https://patchwork.kernel.org/patch/7294001/
https://patchwork.kernel.org/patch/7293981/
The discussion stopped because Tomi lacked the time to work on it.
changes in v3:
- dt binding: don't limit the brightness range to 0-255. Use the range of
the underlying LEDs. as a side-effect, all LEDs must now have the same
range
- driver: Adapt to dt binding update.
- driver: rework probe() for clarity and remove the remaining goto.
changes in v2:
- handle more than one LED.
- don't make the backlight device a child of the LED controller.
- make brightness-levels and default-brightness-level optionnal
- removed the option to use a GPIO enable.
- removed the option to use a regulator. It should be handled by the LED core
- don't make any change to the LED core (not needed anymore)
Jean-Jacques Hiblot (2):
leds: Add managed API to get a LED from a device driver
dt-bindings: backlight: Add led-backlight binding
Tomi Valkeinen (2):
leds: Add of_led_get() and led_put()
backlight: add led-backlight driver
.../bindings/leds/backlight/led-backlight.txt | 28 ++
drivers/leds/led-class.c | 92 ++++++
drivers/video/backlight/Kconfig | 7 +
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/led_bl.c | 268 ++++++++++++++++++
include/linux/leds.h | 6 +
6 files changed, 402 insertions(+)
create mode 100644 Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
create mode 100644 drivers/video/backlight/led_bl.c
--
2.17.1
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