[PATCH 3/3] ARM: dts: qcom: msm8960: expressatt: Add camera flash

Rudraksha Gupta via B4 Relay
2026-03-07T00:58:04Z

From: Rudraksha Gupta <guptarud@gmail.com>

Add camera flash support for the Samsung Galaxy Express (expressatt).

The flash IC uses a one-wire pulse-count protocol on GPIO 3, gated by
PMIC MPP 4 which must be driven high to unlock the flash circuit.

Downstream references:
Link: https://github.com/LineageOS/android_kernel_samsung_d2/blob/stable/cm-12.0-YNG4N/drivers/leds/Makefile#L51
Link: https://github.com/LineageOS/android_kernel_samsung_d2/blob/stable/cm-12.0-YNG4N/arch/arm/mach-msm/board-apexq-camera.c#L591

Signed-off-by: Rudraksha Gupta <guptarud@gmail.com>
---
.../dts/qcom/qcom-msm8960-samsung-expressatt.dts | 31 ++++++++++++++++++++++
1 file changed, 31 insertions(+)

diff --git a/arch/arm/boot/dts/qcom/qcom-msm8960-samsung-expressatt.dts b/arch/arm/boot/dts/qcom/qcom-msm8960-samsung-expressatt.dts
index c4b98af6955d..96460775a4ec 100644
--- a/arch/arm/boot/dts/qcom/qcom-msm8960-samsung-expressatt.dts
+++ b/arch/arm/boot/dts/qcom/qcom-msm8960-samsung-expressatt.dts
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <dt-bindings/input/input.h>
+#include <dt-bindings/leds/common.h>
#include <dt-bindings/reset/qcom,gcc-msm8960.h>

#include "qcom-msm8960.dtsi"
@@ -61,6 +62,20 @@ touchkey_enable: touchkey-enable {
regulator-boot-on;
};

+ camera_flash: led-controller {
+ compatible = "richtek,rt8515";
+ enf-gpios = <&tlmm 3 GPIO_ACTIVE_HIGH>;
+ unlock-gpios = <&pm8921_mpps 4 GPIO_ACTIVE_HIGH>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&cam_flash_en>;
+
+ led {
+ function = LED_FUNCTION_FLASH;
+ color = <LED_COLOR_ID_WHITE>;
+ flash-max-timeout-us = <250000>;
+ };
+ };
+
i2c-gpio-touchkey {
compatible = "i2c-gpio";
#address-cells = <1>;
@@ -247,6 +262,13 @@ touchkey_irq_pin: touchkey-irq-state {
drive-strength = <2>;
bias-disable;
};
+
+ cam_flash_en: cam-flash-en-state {
+ pins = "gpio3";
+ function = "gpio";
+ drive-strength = <16>;
+ bias-pull-down;
+ };
};

&pm8921 {
@@ -572,3 +594,12 @@ magnetometer@2e {
/* TODO: Figure out Mount Matrix */
};
};
+
+&pm8921_mpps {
+ flash_led_unlock: flash-led-unlock-state {
+ pins = "mpp4";
+ function = "digital";
+ output-low;
+ power-source = <PM8921_GPIO_S4>;
+ };
+};

--
2.53.0