linux-kernel - Re: [PATCH v3] arm64: dts: mediatek: Add mt8192 power domains controller

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Date:   Fri, 27 Nov 2020 13:42:33 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Enric Balletbo Serra <eballetbo@...il.com>,
        Weiyi Lu <weiyi.lu@...iatek.com>
Cc:     Nicolas Boichat <drinkcat@...omium.org>,
        Rob Herring <robh@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        srv_heupstream <srv_heupstream@...iatek.com>
Subject: Re: [PATCH v3] arm64: dts: mediatek: Add mt8192 power domains
 controller



On 19/11/2020 15:13, Enric Balletbo Serra wrote:
> Hi Weiyi,
> 
> Missatge de Weiyi Lu <weiyi.lu@...iatek.com> del dia dj., 19 de nov.
> 2020 a les 14:10:
>>
>> On Thu, 2020-11-19 at 13:13 +0100, Enric Balletbo Serra wrote:
>>> Hi Weiyi,
>>>
>>> Thank you for the patch
>>>
>>> Missatge de Weiyi Lu <weiyi.lu@...iatek.com> del dia dj., 19 de nov.
>>> 2020 a les 11:48:
>>>>
>>>> Add power domains controller node for SoC mt8192
>>>>
>>>> Signed-off-by: Weiyi Lu <weiyi.lu@...iatek.com>
>>>> ---
[...]
>>>> +                       /* System Power Manager */
>>>> +                       spm: power-controller {
>>>> +                               compatible = "mediatek,mt8192-power-controller";
>>>> +                               #address-cells = <1>;
>>>> +                               #size-cells = <0>;
>>>> +                               #power-domain-cells = <1>;
>>>> +
>>>> +                               /* power domain of the SoC */
>>>> +                               audio@...192_POWER_DOMAIN_AUDIO {
>>>
>>> If you run the dt_bindings_check it should return some errors, as all
>>> these node names should be 'power-domain@'. Which is a bit annoying
>>> because then you will get a bunch of errors like this:
>>>
>>> [    1.969110] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    1.976997] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    1.984828] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    1.992657] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    2.000685] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    2.008566] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    2.016395] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    2.024221] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    2.032049] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    2.039874] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    2.047699] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    2.055524] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    2.063352] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>> [    2.071176] debugfs: Directory 'power-domain' with parent
>>> 'pm_genpd' already present!
>>>
>>> But that's another problem that should be handled in debugfs system.
>>>
>>
>> Indeed...so I chose to use different name in dts to avoid problems in
>> debugfs. It does violate the naming rules.
>>
> 
> But your binding will not pass (or trigger warnings) the dtb check
> then. Rob was clear that names should be generic. Proper fix is fix
> debugfs not the binding.
> 

By the way, is anybody working on this debugfs issue?

Regards,
Matthias