linux-kernel - Re: [PATCH v2 1/4] dt-bindings: clock: tegra124-dfll: Add property to limit frequency

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Message-ID: <20250904214909.GA69864-robh@kernel.org>
Date: Thu, 4 Sep 2025 16:49:09 -0500
From: Rob Herring <robh@...nel.org>
To: Aaron Kling <webgeek1234@...il.com>
Cc: Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...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>, 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 v2 1/4] dt-bindings: clock: tegra124-dfll: Add property
 to limit frequency

On Wed, Sep 03, 2025 at 02:30:16PM -0500, Aaron Kling wrote:
> The dfll driver generates opp tables based on internal CVB tables
> instead of using dt opp tables. Some devices such as the Jetson Nano
> require limiting the max frequency even further than the corresponding
> CVB table allows in order to maintain thermal limits.
> 
> 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..8a049b684f962f2b06209a47866711b92c15c085 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 in hertz.

Use standard unit suffix: nvidia,dfll-max-hz

> +
>  Example for I2C:
>  
>  clock@...10000 {
> 
> -- 
> 2.50.1
>