linux-kernel - Re: [PATCH 1/5] dt-bindings: clock: tegra124-dfll: Add property to limit frequency

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Message-ID: <cc3e798e-bb66-4e91-8fda-d1c8fcecf301@kernel.org>
Date: Sat, 16 Aug 2025 10:21:53 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: webgeek1234@...il.com, Michael Turquette <mturquette@...libre.com>,
 Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Thierry Reding <thierry.reding@...il.com>,
 Jonathan Hunter <jonathanh@...dia.com>, Joseph Lo <josephl@...dia.com>,
 Peter De Schrijver <pdeschrijver@...dia.com>,
 Prashant Gaikwad <pgaikwad@...dia.com>
Cc: linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
 linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
 Thierry Reding <treding@...dia.com>
Subject: Re: [PATCH 1/5] dt-bindings: clock: tegra124-dfll: Add property to
 limit frequency

On 16/08/2025 07:53, Aaron Kling via B4 Relay wrote:
> From: Aaron Kling <webgeek1234@...il.com>
> 
> Some devices report a cpu speedo value that corresponds to a table that
> scales beyond the chips capability. This allows devices to set a lower
> limit.
> 
> Signed-off-by: Aaron Kling <webgeek1234@...il.com>
> ---
>  Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
> index f7d347385b5775ddd702ecbb9821acfc9d4b9ff2..6cdbabc1f036a767bdc8e5df64eeff34171a3b85 100644
> --- a/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
> +++ b/Documentation/devicetree/bindings/clock/nvidia,tegra124-dfll.txt
> @@ -70,6 +70,9 @@ Required properties for PWM mode:
>    - dvfs_pwm_enable: I/O pad configuration when PWM control is enabled.
>    - dvfs_pwm_disable: I/O pad configuration when PWM control is disabled.
>  
> +Optional properties for limiting frequency:
> +- nvidia,dfll-max-freq: Maximum scaling frequency.


1. Frequency is in units.
2. OPP defines it already, doesn't it?
3. You need to convert file to DT schema first. No new properties are
allowed in text.



Best regards,
Krzysztof