linux-kernel - Re: [PATCH v2 02/16] dt-bindings: stm32: stm32mp25: add `access-controller-cell` property

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Message-ID: <20250715031717.GA4144523-robh@kernel.org>
Date: Mon, 14 Jul 2025 22:17:17 -0500
From: Rob Herring <robh@...nel.org>
To: Clément Le Goffic <clement.legoffic@...s.st.com>
Cc: Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Jonathan Corbet <corbet@....net>,
	Gatien Chevallier <gatien.chevallier@...s.st.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Gabriel Fernandez <gabriel.fernandez@...s.st.com>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Le Goffic <legoffic.clement@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-perf-users@...r.kernel.org, devicetree@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-clk@...r.kernel.org
Subject: Re: [PATCH v2 02/16] dt-bindings: stm32: stm32mp25: add
 `access-controller-cell` property

On Fri, Jul 11, 2025 at 04:48:54PM +0200, Clément Le Goffic wrote:
> RCC is able to check the availability of a clock.
> Allow to query the RCC with a firewall ID.

If it is tied to a clock, do we need another provider? We have the 
"protected clocks" thing, but that might be a bit different.

> 
> Signed-off-by: Clément Le Goffic <clement.legoffic@...s.st.com>
> ---
>  Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml b/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml
> index 88e52f10d1ec..4d471e3d89bc 100644
> --- a/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml
> +++ b/Documentation/devicetree/bindings/clock/st,stm32mp25-rcc.yaml
> @@ -31,6 +31,11 @@ properties:
>    '#reset-cells':
>      const: 1
>  
> +  '#access-controller-cells':
> +    const: 1
> +    description:
> +      Contains the firewall ID associated to the peripheral.
> +
>    clocks:
>      items:
>        - description: CK_SCMI_HSE High Speed External oscillator (8 to 48 MHz)
> @@ -123,6 +128,7 @@ required:
>    - reg
>    - '#clock-cells'
>    - '#reset-cells'
> +  - '#access-controller-cells'
>    - clocks
>  
>  additionalProperties: false
> @@ -136,6 +142,7 @@ examples:
>          reg = <0x44200000 0x10000>;
>          #clock-cells = <1>;
>          #reset-cells = <1>;
> +        #access-controller-cells = <1>;
>          clocks =  <&scmi_clk CK_SCMI_HSE>,
>                    <&scmi_clk CK_SCMI_HSI>,
>                    <&scmi_clk CK_SCMI_MSI>,
> 
> -- 
> 2.43.0
>