Re: [PATCH 1/2] dt-bindings: pwm: clk-pwm: add optional GPIO and pinctrl properties

[Uwe Kleine-König]

Hello,

On Mon, Apr 06, 2026 at 11:50:01PM +0800, Xilin Wu wrote:
> The clk-pwm driver cannot produce constant output levels (0% or 100%
> duty cycle, or disabled state) through the clock hardware alone - the
> actual pin level when the clock is off is undefined and
> hardware-dependent.
> 
> Document optional gpios, pinctrl-names, pinctrl-0, and pinctrl-1
> properties that allow the driver to switch the pin between clock
> function mux (for normal PWM output) and GPIO mode (to drive a
> deterministic constant level).
> 
> Signed-off-by: Xilin Wu <sophon@xxxxxxxxx>
> ---
>  Documentation/devicetree/bindings/pwm/clk-pwm.yaml | 36 +++++++++++++++++++++-
>  1 file changed, 35 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/pwm/clk-pwm.yaml b/Documentation/devicetree/bindings/pwm/clk-pwm.yaml
> index ec1768291503..2a0e3e02d27b 100644
> --- a/Documentation/devicetree/bindings/pwm/clk-pwm.yaml
> +++ b/Documentation/devicetree/bindings/pwm/clk-pwm.yaml
> @@ -15,6 +15,11 @@ description: |
>    It's often possible to control duty-cycle of such clocks which makes them
>    suitable for generating PWM signal.
>  
> +  Optionally, a GPIO and pinctrl states can be provided. When a constant
> +  output level is needed (0%, 100%, or disabled), the pin is switched to

A constant output isn't needed when disabled. The state is undefined
then. A plain clk_disable() is fine then.

Best regards
Uwe

Attachment: signature.asc
Description: PGP signature