linux-kernel - Re: [PATCH v7 1/2] dt-bindings: cpufreq: Document support for Airoha EN7581 CPUFreq

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Message-ID: <173393504106.3264222.5725746620417782948.robh@kernel.org>
Date: Wed, 11 Dec 2024 10:37:21 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>, upstream@...oha.com,
	Conor Dooley <conor+dt@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>, linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzk+dt@...nel.org>
Subject: Re: [PATCH v7 1/2] dt-bindings: cpufreq: Document support for Airoha
 EN7581 CPUFreq


On Fri, 06 Dec 2024 22:11:24 +0100, Christian Marangi wrote:
> On newer Airoha SoC, CPU Frequency is scaled indirectly with SMC commands
> to ATF.
> 
> A virtual clock is exposed. This virtual clock is a get-only clock and
> is used to expose the current global CPU clock. The frequency info comes
> by the output of the SMC command that reports the clock in MHz.
> 
> The SMC sets the CPU clock by providing an index, this is modelled as
> performance states in a power domain.
> 
> CPUs can't be individually scaled as the CPU frequency is shared across
> all CPUs and is global.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
> Changes v7:
> - Add more info to the description for usage of clock and
>   performance-domain
> - Drop redundant nodes from example
> Changes v6:
> - No changes
> Changes v5:
> - Add Reviewed-by tag
> - Fix OPP node name error
> - Rename cpufreq node name to power-domain
> - Rename CPU node power domain name to perf
> - Add model and compatible to example
> Changes v4:
> - Add this patch
> 
>  .../cpufreq/airoha,en7581-cpufreq.yaml        | 55 +++++++++++++++++++
>  1 file changed, 55 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/cpufreq/airoha,en7581-cpufreq.yaml
> 

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>