Il 15/07/22 13:26, ChiaEn Wu ha scritto:

From: ChiaEn Wu <redacted>

MediaTek MT6370 is a SubPMIC consisting of a single cell battery charger
with ADC monitoring, RGB LEDs, dual channel flashlight, WLED backlight
driver, display bias voltage supply, one general purpose LDO, and the
USB Type-C & PD controller complies with the latest USB Type-C and PD
standards.

This adds support for MediaTek MT6370 Backlight driver. It's commonly used
to drive the display WLED. There are 4 channels inside, and each channel
supports up to 30mA of current capability with 2048 current steps in
exponential or linear mapping curves.

Signed-off-by: ChiaEn Wu <redacted>

Hello ChiaEn,

I propose to move this one to drivers/leds (or drivers/pwm) and, instead of
registering a backlight device, register a PWM device.

This way you will be able to reuse the generic backlight-pwm driver, as you'd
be feeding the PWM device exposed by this driver to the generic one: this will
most importantly make it easy to chain it with MTK_DISP_PWM (mtk-pwm-disp)
with a devicetree that looks like...

	pwmleds-disp {

		compatible = "pwm-leds";



		disp_led: disp-pwm {

			label = "backlight-pwm";

			pwms = <&pwm0 0 500000>;

			max-brightness = <1024>;

		};

	};



	backlight_lcd0: backlight {

		compatible = "led-backlight";

		leds = <&disp_led>, <&pmic_bl_led>;



		default-brightness-level = <300>;

	};

Regards,
Angelo