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

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Message-ID: <7de8a1dd-6e54-6fb5-1b3f-3162d2412608@linaro.org>
Date:   Mon, 16 Jan 2023 09:21:23 +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 16/01/2023 09:20, Krzysztof Kozlowski wrote:
> 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.

Hm, although dtbs_check would complain... so let's clarify - why you are
not adding syscon-reboot now? It should be always here - either SoC
supports it or it does not. Board support is other thing, but this is
DTSI for SoC.

Best regards,
Krzysztof