linux-kernel - Re: [Linux-stm32] [PATCH 3/3] ARM: dts: stm32: update stm32mp151 for remote proc synchronisation support

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Message-ID: <be888a4b-b931-521b-42c7-fd4e60afd945@pengutronix.de>
Date:   Thu, 24 Sep 2020 07:45:11 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Arnaud Pouliquen <arnaud.pouliquen@...com>,
        Rob Herring <robh@...nel.org>,
        Alexandre Torgue <alexandre.torgue@...com>
Cc:     Ohad Ben-Cohen <ohad@...ery.com>, devicetree@...r.kernel.org,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Fabien Dessenne <fabien.dessenne@...com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [Linux-stm32] [PATCH 3/3] ARM: dts: stm32: update stm32mp151 for
 remote proc synchronisation support

Hello Arnaud,

On 8/27/20 9:21 AM, 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>;
> +		};
> +

Just saw this now. I have a pending patch adding this node as well:
https://lore.kernel.org/patchwork/patch/1306971/

For my use case, I need a "simple-mfd" compatible to allow child
nodes to be probed.

Could you CC me when you send out your v2, so I can rebase?
(Or if you don't mind, just add the "simple-mfd" into the compatible
list yourself :-)

Cheers
Ahmad

>  		/*
>  		 * 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>;
>  			status = "disabled";
>  		};
>  	};
> 

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