Uwe Kleine-König [off-list ref] wrote:

Hello Thierry,

On Fri, Nov 16, 2018 at 10:51:24AM +0100, Thierry Reding wrote:

quoted

On Thu, Nov 15, 2018 at 09:37:33PM +0100, Uwe Kleine-König wrote:  

quoted

On Thu, Nov 15, 2018 at 04:25:45PM +0100, Thierry Reding wrote:  

[...]

quoted

But why? The backlight doesn't care about the specific pinmuxing of the
PWM pin. All it cares about is the PWM signal. That's the level of
abstraction that the PWM consumer expects, anything lower level belongs
in the PWM driver.  

The backlight driver cares about the PWM pin muxing because if it's
wrongly muxed the backlight doesn't work as intended.

With this argumentation you would also have to define the clocks needed
for the PWM in the backlight (or whatever pwm consumer) driver, because
if the clocks are not set up correctly the backlight won't work as
expected...

The PWM driver is driving the pins, so that is where the pinctrls
belong.


Lothar Waßmann
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