This adds the backlight panel, power, pwm and tcon0 device-tree bindings
required for supporting the 3.5" LCD from LeMaker on the BananaPi M1.
The brightness levels are adjusted with a gamma curve using a 1.8 power,
with indices from 0 to 100 and values ranging from 0 to 255, such as:
level = (index / 100)^1.8 * 255
Signed-off-by: Paul Kocialkowski <cont...@paulk.fr>
---
arch/arm/boot/dts/sun7i-a20-bananapi.dts | 71 ++++++++++++++++++++++++
1 file changed, 71 insertions(+)
diff --git a/arch/arm/boot/dts/sun7i-a20-bananapi.dts
b/arch/arm/boot/dts/sun7i-a20-bananapi.dts
index 70dfc4ac0bb5..ac6c3e988203 100644
--- a/arch/arm/boot/dts/sun7i-a20-bananapi.dts
+++ b/arch/arm/boot/dts/sun7i-a20-bananapi.dts
@@ -48,6 +48,7 @@
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/pwm/pwm.h>
/ {
model = "LeMaker Banana Pi";
@@ -63,6 +64,57 @@
stdout-path = "serial0:115200n8";
};
+
+ backlight: backlight {
+ compatible = "pwm-backlight";
+ pwms = <&pwm 0 50000 0>;
+ /* This table uses a gamma curve with a 1.8 power. */
+ brightness-levels = < 0 1 1 1 1 1 2 2
+ 3 3 4 5 6 6 7 8
+ 9 11 12 13 14 15 17 18
+ 20 21 23 24 26 27 29 31
+ 33 35 37 39 41 43 45 47
+ 49 51 54 56 58 61 63 66
+ 68 71 73 76 79 81 84 87
+ 90 93 96 99 102 105 108 111
+ 114 117 121 124 127 131 134 138
+ 141 145 148 152 156 159 163 167
+ 171 175 178 182 186 190 194 198
+ 203 207 211 215 219 224 228 233
+ 237 241 246 250 255>;
+ default-brightness-level = <50>;
+ enable-gpios = <&pio 7 8 GPIO_ACTIVE_HIGH>; /* PH8 */
+ };
+
+ panel: panel {
+ compatible = "lemaker,bl035-rgb-002";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ power-supply = <&panel_power>;
+ backlight = <&backlight>;
+
+ port@0 {
+ reg = <0>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ panel_input: endpoint@0 {
+ reg = <0>;
+ remote-endpoint = <&tcon0_out_panel>;
+ };
+ };
+ };
+
+ panel_power: panel_power {
+ compatible = "regulator-fixed";
+ regulator-name = "panel-power";
+ regulator-min-microvolt = <10400000>;
+ regulator-max-microvolt = <10400000>;
+ gpio = <&pio 7 12 GPIO_ACTIVE_HIGH>; /* PH12 */
+ enable-active-high;
+ regulator-boot-on;
+ };
+
hdmi-connector {
compatible = "hdmi-connector";
type = "a";
@@ -275,6 +327,12 @@
};
};
+&pwm {
+ pinctrl-names = "default";
+ pinctrl-0 = <&pwm0_pins_a>;
+ status = "okay";
+};
+
#include "axp209.dtsi"
®_dcdc2 {
@@ -322,6 +380,19 @@
status = "okay";
};
+&tcon0 {
+ pinctrl-names = "default";
+ pinctrl-0 = <&lcd0_rgb888_pins>;
+ status = "okay";
+};
+
+&tcon0_out {
+ tcon0_out_panel: endpoint@0 {
+ reg = <0>;
+ remote-endpoint = <&panel_input>;
+ };
+};
+
&uart0 {
pinctrl-names = "default";
pinctrl-0 = <&uart0_pins_a>;
--
2.19.1
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