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 <[email protected]>
---
 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 */
+       };
+
        chosen {
                stdout-path = "serial0:115200n8";
        };
-- 
2.4.3

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