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

Rudraksha Gupta
2026-03-18T18:39:30Z

On 3/7/26 00:23, David Heidelberg wrote:
> On 07/03/2026 01:58, Rudraksha Gupta via B4 Relay wrote:
>> 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>;
>> +
>
> LGTM, just please order pinctrl-n before pinctrl-names :)
>
> Reviewed-by: David Heidelberg <david@ixit.cz>
>
> Nitpick: if you can, add phone-devel@vger.kernel.org for next time,
> it's easier to distinguish the phone patches in huge linux-arm-msm
> pile :)

Hello David,

Thanks for your comments! I have addressed them in v2 :)

Rudraksha

>
> David
>