linux-kernel - Re: [PATCH 3/3] arm64: dts: ti: k3-am64: Fix epwm

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Date:   Mon, 7 Aug 2023 08:21:37 -0500
From:   Andrew Davis <afd@...com>
To:     Francesco Dolcini <francesco@...cini.it>,
        Nishanth Menon <nm@...com>
CC:     Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] arm64: dts: ti: k3-am64: Fix epwm_tbclk node name to
 generic name

On 8/6/23 3:33 AM, Francesco Dolcini wrote:
> Hello Andrew, hello Nishanth
> 
> On Wed, Aug 02, 2023 at 12:45:21PM -0500, Andrew Davis wrote:
>> The name "clock" is not allowed for nodes, use "clock-controller" to
>> remove the DTS check warning.
>>
>> Signed-off-by: Andrew Davis <afd@...com>
>> ---
>>   arch/arm64/boot/dts/ti/k3-am64-main.dtsi | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
>> index e27eb2e585f14..4e3e450e4e4c8 100644
>> --- a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
>> +++ b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
>> @@ -61,7 +61,7 @@ phy_gmii_sel: phy@...4 {
>>   			#phy-cells = <1>;
>>   		};
>>   
>> -		epwm_tbclk: clock@...0 {
>> +		epwm_tbclk: clock-controller@...0 {
> 
> I was asked to do the exact same change here [1] by Nishanth, and I'm
> sending the updated patch in a short while.
> 
> However I have one question, according to the
> devicetree-specification-v0.4.pdf [2] "2.2.2 Generic Names
> Recommendation", clock is a valid node name.
> 
> While testing the DT (make CHECK_DTBS=y), I did not have any warning nor
> error.
> 
> What am I missing?
> 

These nodes are not just any nodes, they are part of "ti,j721e-system-controller"
(well not really, we have been just calling these areas that to sneak around
the restrictions on "syscon", "simple-mfd" devices), and so can only have the
node names specified by that binding [0].

I'm working to convert these areas to normal "simple-bus" nodes, when that is
complete then the name "clock" will be fine again here.

Andrew

[0] https://www.kernel.org/doc/Documentation/devicetree/bindings/mfd/ti%2Cj721e-system-controller.yaml

> In addition to that I guess we should also update the example in the dt
> bindings yaml file.
> 
> Francesco
> 
> 
> [1] https://lore.kernel.org/all/20230731142135.108477-2-francesco@dolcini.it/
> [2] https://github.com/devicetree-org/devicetree-specification/releases/download/v0.4/devicetree-specification-v0.4.pdf