linux-kernel - Re: [PATCH 2/2] ARM: dts: imx6qdl: support child mfd cells for the reset controller

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Date:   Mon, 16 Jan 2023 09:20:09 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Bastian Krause <bst@...gutronix.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Ahmad Fatoum <a.fatoum@...gutronix.de>
Subject: Re: [PATCH 2/2] ARM: dts: imx6qdl: support child mfd cells for the
 reset controller

On 13/01/2023 18:32, Bastian Krause wrote:
> The actual syscon-reboot-mode child node can be added by a board
> device-tree 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.
> 
> Suggested-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
> Signed-off-by: Bastian Krause <bst@...gutronix.de>
> ---
>  arch/arm/boot/dts/imx6qdl.dtsi | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
> index ff1e0173b39be..b16be39458aa6 100644
> --- a/arch/arm/boot/dts/imx6qdl.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl.dtsi
> @@ -865,7 +865,8 @@ epit2: epit@...4000 { /* EPIT2 */
>  			};
>  
>  			src: reset-controller@...8000 {
> -				compatible = "fsl,imx6q-src", "fsl,imx51-src";
> +				compatible = "fsl,imx6q-src", "fsl,imx51-src",
> +					     "syscon", "simple-mfd";

You need children here. Otherwise simple-mfd does not make sense. If you
expect something else to add children (I don't understand why, usually
reboot capability is fixed per SoC and only sometimes extended with some
other means), then this "else" will also change compatible.

Best regards,
Krzysztof