linux-kernel - Re: [PATCH RFC WIP 1/2] dt-bindings: net: rockchip-dwmac: add rockchip,phy-wol property

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Message-ID: <b7a11c77-94ac-445c-a513-5bc58e1dfdd1@linaro.org>
Date:   Fri, 24 Nov 2023 08:57:45 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Javier Carrasco <javier.carrasco@...fvision.net>,
        Conor Dooley <conor@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        David Wu <david.wu@...k-chips.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH RFC WIP 1/2] dt-bindings: net: rockchip-dwmac: add
 rockchip,phy-wol property

On 23/11/2023 20:36, Javier Carrasco wrote:
> On 23.11.23 18:20, Conor Dooley wrote:
>> On Thu, Nov 23, 2023 at 01:14:13PM +0100, Javier Carrasco wrote:
>>> This property defines if PHY WOL is preferred. If it is not defined, MAC
>>> WOL will be preferred instead.
>>>
>>> Signed-off-by: Javier Carrasco <javier.carrasco@...fvision.net>
>>> ---
>>>  Documentation/devicetree/bindings/net/rockchip-dwmac.yaml | 6 ++++++
>>>  1 file changed, 6 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/rockchip-dwmac.yaml b/Documentation/devicetree/bindings/net/rockchip-dwmac.yaml
>>> index 70bbc4220e2a..fc4b02a5a375 100644
>>> --- a/Documentation/devicetree/bindings/net/rockchip-dwmac.yaml
>>> +++ b/Documentation/devicetree/bindings/net/rockchip-dwmac.yaml
>>> @@ -91,6 +91,12 @@ properties:
>>>        The phandle of the syscon node for the peripheral general register file.
>>>      $ref: /schemas/types.yaml#/definitions/phandle
>>>  
>>> +  rockchip,phy-wol:
>>> +    type: boolean
>>> +    description:
>>> +      If present, indicates that PHY WOL is preferred. MAC WOL is preferred
>>> +      otherwise.
>>
>> Although I suspect this isn't, it sounds like software policy. What
>> attribute of the hardware determines which is preferred?
> 
> Maybe the word "preferred" set off a red flag. The description is taken
> from the mediatek,mac-wol, which is used to set the same flag with
> inverted logic (I could invert my logic to call mine rockchip,mac-wol
> and use a description without "preferences").
> 
> This property is used to enable the PHY WOL in case the MAC is powered
> off in suspend mode, so it cannot provide WOL. This is done by a PMIC as
> defined in the device tree and that should not be something the software
> could tweak.

I wonder if generic wakeup-source property could not be used. WOL is a
bit different because it allows to actually turn on the computer, but
otherwise it is also a wake-up.

Best regards,
Krzysztof