linux-kernel - Re: [PATCH v2 2/2] ARM: dts: stm32: support child mfd cells for the stm32mp1 TAMP syscon

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Message-ID: <352478be-cd69-2089-baaf-6f796cfc6cfd@st.com>
Date:   Tue, 17 Nov 2020 12:18:42 +0100
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
CC:     <kernel@...gutronix.de>,
        Arnaud Pouliquen <arnaud.pouliquen@...com>,
        <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] ARM: dts: stm32: support child mfd cells for the
 stm32mp1 TAMP syscon

Hi Ahmad

On 10/21/20 12:28 PM, Ahmad Fatoum wrote:
> The stm32mp1 TAMP peripheral has 32 backup registers that survive
> a warm reset. This makes them suitable for storing a reboot
> mode, which the vendor's kernel tree is already doing[0].
> 
> The actual syscon-reboot-mode child node can be added by a board.dts or
> fixed up by the bootloader. For the child node to be probed, the
> compatible needs to include simple-mfd. The binding now specifies this,
> so have the SoC dtsi adhere to it.
> 
> [0]: https://github.com/STMicroelectronics/linux/commit/2e9bfc29dd
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
> ---
> v1 -> v2:
>    - Dropped simple-bus. simple-mfd is all that's needed
>    - reworded commit message
> ---
>   arch/arm/boot/dts/stm32mp151.dtsi | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
> index 842ecffae73a..662c2408d41b 100644
> --- a/arch/arm/boot/dts/stm32mp151.dtsi
> +++ b/arch/arm/boot/dts/stm32mp151.dtsi
> @@ -1542,7 +1542,7 @@ i2c6: i2c@...09000 {
>   		};
>   
>   		tamp: tamp@...0a000 {
> -			compatible = "st,stm32-tamp", "syscon";
> +			compatible = "st,stm32-tamp", "syscon", "simple-mfd";
>   			reg = <0x5c00a000 0x400>;
>   		};
>   
> 

Series applied on stm32-next.

Regards
Alex