On Sun, Sep 20, 2015 at 8:30 PM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote:
> 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 <hdegoede@xxxxxxxxxx>
> ---
> 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
>
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