linux-kernel - Re: [Linux-stm32] [PATCH v2 12/13] ARM: dts: stm32: enable optee firmware and SCMI support on STM32MP13

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Message-ID: <1d90078d-e27f-539d-d010-78a3c4da565a@pengutronix.de>
Date:   Fri, 25 Feb 2022 16:13:25 +0100
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     gabriel.fernandez@...s.st.com,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [Linux-stm32] [PATCH v2 12/13] ARM: dts: stm32: enable optee
 firmware and SCMI support on STM32MP13

Hello Gabriel,

On 25.02.22 14:31, gabriel.fernandez@...s.st.com wrote:
> From: Gabriel Fernandez <gabriel.fernandez@...s.st.com>
> 
> Enable optee and SCMI clocks support.
> 
> Signed-off-by: Gabriel Fernandez <gabriel.fernandez@...s.st.com>
> ---
>  arch/arm/boot/dts/stm32mp131.dtsi | 37 +++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/stm32mp131.dtsi b/arch/arm/boot/dts/stm32mp131.dtsi
> index 262de4eeb4ed..78eac53224d4 100644
> --- a/arch/arm/boot/dts/stm32mp131.dtsi
> +++ b/arch/arm/boot/dts/stm32mp131.dtsi
> @@ -27,6 +27,43 @@ arm-pmu {
>  		interrupt-parent = <&intc>;
>  	};
>  
> +	scmi_sram: sram@...ff000 {
> +		compatible = "mmio-sram";
> +		reg = <0x2ffff000 0x1000>;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges = <0 0x2ffff000 0x1000>;
> +
> +		scmi_shm: scmi_shm@0 {
> +			compatible = "arm,scmi-shmem";
> +			reg = <0 0x80>;
> +		};
> +	};
> +
> +	firmware {
> +		optee {
> +			method = "smc";
> +			compatible = "linaro,optee-tz";
> +		};
> +
> +		scmi: scmi {
> +			compatible = "linaro,scmi-optee";

This compatible doesn't seem to be documented upstream. I am looking at v5.17-rc5.
Do you have a reference detailing the difference between this conduit and
plain arm,scmi-smc (as used with TF-A on the STM32MP151).

Cheers,
Ahmad

> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			linaro,optee-channel-id = <0>;
> +			shmem = <&scmi_shm>;
> +
> +			scmi_clk: protocol@14 {
> +				reg = <0x14>;
> +				#clock-cells = <1>;
> +			};
> +
> +			scmi_reset: protocol@16 {
> +				reg = <0x16>;
> +				#reset-cells = <1>;
> +			};
> +		};
> +	};
>  	clocks {
>  		clk_axi: clk-axi {
>  			#clock-cells = <0>;


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