[PATCH 5/5] ARM: dts: sun5i: Add backlight node to sun5i-q8-common.dtsi
From: Chen-Yu Tsai <hidden>
Date: 2015-09-20 14:46:56
Also in:
linux-devicetree
On Sun, Sep 20, 2015 at 8:30 PM, Hans de Goede [off-list ref] wrote:
quoted hunk
All A13 based q8 formfactor tablets use the same backlight setup, add a backlight devicetree node for controlling the backlight on these devices. Signed-off-by: Hans de Goede <redacted> --- arch/arm/boot/dts/sun5i-q8-common.dtsi | 11 +++++++++++ 1 file changed, 11 insertions(+)diff --git a/arch/arm/boot/dts/sun5i-q8-common.dtsi b/arch/arm/boot/dts/sun5i-q8-common.dtsi index 0641d68..76a5204 100644 --- a/arch/arm/boot/dts/sun5i-q8-common.dtsi +++ b/arch/arm/boot/dts/sun5i-q8-common.dtsi@@ -41,11 +41,22 @@ */ #include "sunxi-q8-common.dtsi" +#include <dt-bindings/pwm/pwm.h> + / { aliases { serial0 = &uart1; }; + backlight: backlight { + compatible = "pwm-backlight"; + pwms = <&pwm 0 50000 PWM_POLARITY_INVERTED>; + brightness-levels = <0 10 20 30 40 50 60 70 80 90 100>; + default-brightness-level = <8>; + /* TODO: backlight uses axp gpio1 as enable pin */ + /* TODO: backlight is powered by AXP209 DCDC1SW */
There's no DCDC1SW on AXP209. The reference design shows the backlight regulator is powered directly from IPSOUT, but the PWM pullup is powered by LCD-VCC, which itself is enabled by AXP209 GPIO0. Would that be the case, or maybe closer, given we don't have schematics? Regards ChenYu
+ };
+
chosen {
stdout-path = "serial0:115200n8";
};
--
2.4.3