arm64: dts: qcom: msm8939-longcheer-l9100: Add rear flash

The phone has a Silergy SY7802 flash LED controller.

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: André Apitzsch <git@apitzsch.eu>
Link: https://lore.kernel.org/r/20240729-sy7802-v6-1-86bb9083e40b@apitzsch.eu
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/msm8939-longcheer-l9100.dts

@@ -178,6 +178,26 @@
 			led-sources = <0>, <1>;
 		};
 	};
+
+	flash-led-controller@53 {
+		compatible = "silergy,sy7802";
+		reg = <0x53>;
+
+		enable-gpios = <&tlmm 16 GPIO_ACTIVE_HIGH>;
+
+		pinctrl-0 = <&camera_rear_flash_default>;
+		pinctrl-names = "default";
+
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		led@0 {
+			reg = <0>;
+			function = LED_FUNCTION_FLASH;
+			color = <LED_COLOR_ID_WHITE>;
+			led-sources = <0>, <1>;
+		};
+	};
 };
 
 &blsp_i2c3 {
@@ -344,6 +364,13 @@
 		bias-disable;
 	};
 
+	camera_rear_flash_default: camera-rear-flash-default-state {
+		pins = "gpio9", "gpio16", "gpio51";
+		function = "gpio";
+		drive-strength = <2>;
+		bias-disable;
+	};
+
 	gpio_hall_sensor_default: gpio-hall-sensor-default-state {
 		pins = "gpio20";
 		function = "gpio";