linux-kernel - Re: [PATCH v2 3/3] dt-bindings: mfd: stpmic1: add fsl,pmic-poweroff property

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Message-Id: <9B1EE405-77D3-4980-9A13-9D4F87C1A64F@geanix.com>
Date:   Tue, 23 May 2023 11:55:50 +0200
From:   Sean Nyekjær <sean@...nix.com>
To:     Conor Dooley <conor@...nel.org>
Cc:     robh+dt@...nel.org, Lee Jones <lee@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        pascal Paillet <p.paillet@...s.st.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] dt-bindings: mfd: stpmic1: add fsl,pmic-poweroff
 property

Hey Conor,

> On 16 May 2023, at 20.06, Conor Dooley <conor@...nel.org> wrote:
> 
> Hey Sean,
> 
> On Tue, May 16, 2023 at 03:22:24PM +0200, Sean Nyekjaer wrote:
>> Document the new optional "fsl,pmic-poweroff" property.
>> 
>> Signed-off-by: Sean Nyekjaer <sean@...nix.com>
>> ---
>> Documentation/devicetree/bindings/mfd/st,stpmic1.yaml | 8 ++++++++
>> 1 file changed, 8 insertions(+)
>> 
>> diff --git a/Documentation/devicetree/bindings/mfd/st,stpmic1.yaml b/Documentation/devicetree/bindings/mfd/st,stpmic1.yaml
>> index 9573e4af949e..5183a7c660d2 100644
>> --- a/Documentation/devicetree/bindings/mfd/st,stpmic1.yaml
>> +++ b/Documentation/devicetree/bindings/mfd/st,stpmic1.yaml
>> @@ -26,6 +26,14 @@ properties:
>> 
>>   interrupt-controller: true
>> 
>> +  st,pmic-poweroff:
>> +    $ref: /schemas/types.yaml#/definitions/flag
>> +    description: |
>> +      if present, configure the PMIC to shutdown all power rails when
>> +      power off sequence have finished.
>> +      Use this option if the SoC should be powered off by external power management
>> +      IC (PMIC).
> 
> Just reading this description, this is sounding quite like a "software
> behaviour" type of property, which are not permitted, rather than
> describing some element of the hardware. Clearly you are trying to solve
> an actual problem though, so try re-phrasing the description (and
> property name) to focus on what exact hardware configuration it is that
> you are trying to special-case.
> Krzysztof suggested that the samsung,s2mps11-acokb-ground property in
> samsung,s2mps11.yaml is addressing a similar problem, so that could be
> good to look at.

Better wording?
      Indicates that the power management IC (PMIC) is used to power off the board.
      So as the last step in the power off sequence set the SWOFF bit in the
      main control register (MAIN_CR) register, to shutdown all power rails.

> 
> Also, the dt-binding patch should go before the patch adding the
> property to the driver.
> 

I will switch them around.

> Thanks,
> Conor.

/Sean