linux-kernel - Re: [PATCH v1 2/3] dt-binding: power: power-domain: add power-supply-needs-irq

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Message-ID: <69e8195e-8d2b-3df0-0783-269f9aef1a83@linaro.org>
Date:   Tue, 12 Jul 2022 09:01:58 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Martin Kepplinger <martin.kepplinger@...i.sm>, rafael@...nel.org,
        khilman@...nel.org, ulf.hansson@...aro.org, robh@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
        pavel@....cz
Cc:     kernel@...i.sm, linux-imx@....com, broonie@...nel.org,
        l.stach@...gutronix.de, aford173@...il.com,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 2/3] dt-binding: power: power-domain: add
 power-supply-needs-irq

On 11/07/2022 15:17, Martin Kepplinger wrote:
> Am Montag, dem 11.07.2022 um 12:38 +0200 schrieb Krzysztof Kozlowski:
>> On 11/07/2022 11:45, Martin Kepplinger wrote:
>>> Add the power-supply-needs-irq board description property for power
>>> domains.
>>
>> Where is a board description here? I think you just meant
>> "power-supply-needs-irq property"?
>>>
>>> Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>
>>> ---
>>>  .../devicetree/bindings/power/power-domain.yaml        | 10
>>> ++++++++++
>>>  1 file changed, 10 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/power/power-
>>> domain.yaml b/Documentation/devicetree/bindings/power/power-
>>> domain.yaml
>>> index 889091b9814f..e82c2f7ccb97 100644
>>> --- a/Documentation/devicetree/bindings/power/power-domain.yaml
>>> +++ b/Documentation/devicetree/bindings/power/power-domain.yaml
>>> @@ -70,6 +70,16 @@ properties:
>>>        by the given provider should be subdomains of the domain
>>> specified
>>>        by this binding.
>>>  
>>> +  power-supply: true
>>
>> This is a new property not described in the commit msg.
> 
> true, I think it's missing and could be added as a separate patch.
> 
>>
>>> +
>>> +  power-supply-needs-irq:
>>> +    type: boolean
>>> +    description:
>>> +      A power-supply can link for example to a regulator
>>> controlled via
>>> +      i2c or otherwise needing interrupts enabled to be able to
>>> enable and
>>> +      disable. 
>>
>> Not really a property of power domain. How the regulator supply works
>> is
>> entirely up to regulator. Otherwise such property should appear for
>> every device.
> 
> you're right. The power-domain driver could read the power-supply
> regulator node directly. Still, I think then a new regulator property
> is needed instead, or is it?

In case of regulator, I am not so sure it needs a dedicated property of
DT. If it is I2C regulator - the parent node is I2C bus and regulator
device is some child of I2C controller (could be via a MFD device), so
no need for dedicated property.

If it uses interrupts, then:
1. The presence of interrupts is already known - "interrupts" property.
2. The actual use of interrupts is DT independent and only driver knows it.

Best regards,
Krzysztof