linux-kernel - Re: [PATCH v3 2/3] dt-bindings: pwm: adi,axi-pwmgen: fix clocks

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Message-ID: <20250602-glorious-horned-beluga-f396da@kuoka>
Date: Mon, 2 Jun 2025 10:00:40 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: David Lechner <dlechner@...libre.com>
Cc: Michael Hennerich <michael.hennerich@...log.com>, 
	Nuno Sá <nuno.sa@...log.com>, Trevor Gamblin <tgamblin@...libre.com>, 
	Uwe Kleine-König <ukleinek@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, linux-pwm@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v3 2/3] dt-bindings: pwm: adi,axi-pwmgen: fix clocks

On Thu, May 29, 2025 at 11:53:19AM GMT, David Lechner wrote:
> Fix a shortcoming in the bindings that doesn't allow for a separate
> external clock.
> 
> The AXI PWMGEN IP block has a compile option ASYNC_CLK_EN that allows
> the use of an external clock for the PWM output separate from the AXI
> clock that runs the peripheral.
> 
> This was missed in the original bindings and so users were writing dts
> files where the one and only clock specified would be the external
> clock, if there was one, incorrectly missing the separate AXI clock.
> 
> The correct bindings are that the AXI clock is always required and the
> external clock is optional (must be given only when HDL compile option
> ASYNC_CLK_EN=1).
> 
> Cc: stable@...r.kernel.org
> Fixes: 1edf2c2a2841 ("dt-bindings: pwm: Add AXI PWM generator")
> Signed-off-by: David Lechner <dlechner@...libre.com>
> ---
>  Documentation/devicetree/bindings/pwm/adi,axi-pwmgen.yaml | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof