On Wed, Jan 28, 2026 at 11:11:33AM +0100, Krzysztof Kozlowski wrote: > On 23/01/2026 12:11, [email protected] wrote: > > > > > > On 20-01-2026 20:01, Krzysztof Kozlowski wrote: > >> On 20/01/2026 13:50, Sudarshan Shetty wrote: > >>> Update the gpio-backlight binding to support configurations that require > >>> more than one GPIO for enabling/disabling the backlight. > >> > >> > >> Why? Which devices need it? How a backlight would have three enable > >> GPIOs? I really do not believe, so you need to write proper hardware > >> justification. > >> > > > > To clarify our hardware setup: > > the panel requires one GPIO for the backlight enable signal, and it > > also has a PWM input. Since the QCS615 does not provide a PWM controller > > for this use case, the PWM input is connected to a GPIO that is driven > > high to provide a constant 100% duty cycle, as explained in the link > > below. > > https://lore.kernel.org/all/[email protected]/T/#m93ca4e5c7bf055715ed13316d91f0cd544244cf5 > > That's not an enable gpio, but PWM. > > You write bindings for this device, not for something else - like your > board.
Sudarshan: I believe at one point the intent was to model this hardware as a pwm-backlight (using enables GPIOs to drive the enable pin) attached to a pwm-gpio (to drive the PWM pin). Did this approach work? Daniel.
