arm64: dts: mediatek: spherion: Add keyboard backlight

The Spherion board has keyboard backlight controlled by the PWM signal
generated by the ChromeOS EC.

Enable PWM output for ChromeOS EC and add a PWM controlled LED node for
the keyboard backlight.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Link: https://lore.kernel.org/r/20220629155956.1138955-13-nfraprado@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>

diff --git a/arch/arm64/boot/dts/mediatek/mt8192-asurada-spherion-r0.dts b/arch/arm64/boot/dts/mediatek/mt8192-asurada-spherion-r0.dts
index 42db81e95fae4631a326de267836a5c7e1d5fe84..fa3d9573f37a5d36581e09ebfa0abf7dc9507deb 100644 (file)
--- a/arch/arm64/boot/dts/mediatek/mt8192-asurada-spherion-r0.dts
+++ b/arch/arm64/boot/dts/mediatek/mt8192-asurada-spherion-r0.dts
@@ -4,12 +4,28 @@
  */
 /dts-v1/;
 #include "mt8192-asurada.dtsi"
+#include <dt-bindings/leds/common.h>
 
 / {
        model = "Google Spherion (rev0 - 3)";
        compatible = "google,spherion-rev3", "google,spherion-rev2",
                     "google,spherion-rev1", "google,spherion-rev0",
                     "google,spherion", "mediatek,mt8192";
+
+       pwmleds {
+               compatible = "pwm-leds";
+
+               led {
+                       function = LED_FUNCTION_KBD_BACKLIGHT;
+                       color = <LED_COLOR_ID_WHITE>;
+                       pwms = <&cros_ec_pwm 0>;
+                       max-brightness = <1023>;
+               };
+       };
+};
+
+&cros_ec_pwm {
+       status = "okay";
 };
 
 &keyboard_controller {