linux-kernel - Re: [PATCH v2 4/4] ARM: dts: stm32: update stm32mp151 for remote proc synchronization support

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Date:   Wed, 14 Oct 2020 10:51:21 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Arnaud Pouliquen <arnaud.pouliquen@...com>
Cc:     Rob Herring <robh@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...com>,
        devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>
Subject: Re: [PATCH v2 4/4] ARM: dts: stm32: update stm32mp151 for remote
 proc synchronization support

On Wed, Oct 14, 2020 at 02:54:41PM +0200, Arnaud Pouliquen wrote:
> Two backup registers are used to store the Cortex-M4 state and the resource
> table address.
> Declare the tamp node and add associated properties in m4_rproc node
> to allow Linux to attach to a firmware loaded by the first boot stages.
> 
> Associated driver implementation is available in commit 9276536f455b3
> ("remoteproc: stm32: Parse syscon that will manage M4 synchronisation").
> 
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...com>
> ---
>  arch/arm/boot/dts/stm32mp151.dtsi | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
> index bfe29023fbd5..842ecffae73a 100644
> --- a/arch/arm/boot/dts/stm32mp151.dtsi
> +++ b/arch/arm/boot/dts/stm32mp151.dtsi
> @@ -1541,6 +1541,11 @@
>  			status = "disabled";
>  		};
>  
> +		tamp: tamp@...0a000 {
> +			compatible = "st,stm32-tamp", "syscon";
> +			reg = <0x5c00a000 0x400>;
> +		};
> +
>  		/*
>  		 * Break node order to solve dependency probe issue between
>  		 * pinctrl and exti.
> @@ -1717,6 +1722,8 @@
>  			st,syscfg-holdboot = <&rcc 0x10C 0x1>;
>  			st,syscfg-tz = <&rcc 0x000 0x1>;
>  			st,syscfg-pdds = <&pwr_mcu 0x0 0x1>;
> +			st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
> +			st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;

Tested-by: Mathieu Poirier <mathieu.poirier@...aro.org>

>  			status = "disabled";
>  		};
>  	};
> -- 
> 2.17.1
>