linux-kernel - Re: [PATCH v3 08/12] net: ethernet: stmmac: stm32: support the phy-supply regulator binding

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Date:   Fri, 6 Oct 2023 13:53:23 +0200
From:   Alexandre TORGUE <alexandre.torgue@...s.st.com>
To:     Christophe ROULLIER <christophe.roullier@...s.st.com>,
        Ben Wolsieffer <ben.wolsieffer@...ring.com>
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>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, <netdev@...r.kernel.org>,
        <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 08/12] net: ethernet: stmmac: stm32: support the
 phy-supply regulator binding

On 10/5/23 13:27, Christophe ROULLIER wrote:
> 
> On 9/28/23 17:45, Ben Wolsieffer wrote:
>> Hello,
>>
>> On Thu, Sep 28, 2023 at 05:15:08PM +0200, Christophe Roullier wrote:
>>> From: Christophe Roullier <christophe.roullier@...com>
>>>
>>> Configure the phy regulator if defined by the "phy-supply" DT phandle.
>>>
>>> Signed-off-by: Christophe Roullier <christophe.roullier@...s.st.com>
>>> ---
>>>   .../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 51 ++++++++++++++++++-
>>>   1 file changed, 50 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c 
>>> b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
>>> index 72dda71850d75..31e3abd2caeaa 100644
>>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
>>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
>> ... snip ...
>>>   static int stm32mp1_suspend(struct stm32_dwmac *dwmac)
>>> @@ -455,12 +496,20 @@ static int stm32mp1_suspend(struct stm32_dwmac 
>>> *dwmac)
>>>       if (dwmac->enable_eth_ck)
>>>           clk_disable_unprepare(dwmac->clk_eth_ck);
>>> +    /* Keep the PHY up if we use Wake-on-Lan. */
>>> +    if (!device_may_wakeup(dwmac->dev))
>>> +        phy_power_on(dwmac, false);
>>> +
>>>       return ret;
>>>   }
>>>   static void stm32mp1_resume(struct stm32_dwmac *dwmac)
>>>   {
>>>       clk_disable_unprepare(dwmac->clk_ethstp);
>>> +
>>> +    /* The PHY was up for Wake-on-Lan. */
>>> +    if (!device_may_wakeup(dwmac->dev))
>>> +        phy_power_on(dwmac, true);
>>>   }
>>>   static int stm32mcu_suspend(struct stm32_dwmac *dwmac)
>> Why only turn off the regulator in suspend on the STM32MP1 and not STM32
>> MCUs? It seems like this could just go in stm32_dwmac_suspend/resume().
>>
>> Selfishly, I have a use case for this on an STM32F746 platform, so I
>> would like to see support for it and would test an updated version.
>>
> Hi,
> 
> I'm working on MPU boards, I do not have MCU board, so feel free to 
> contribute on MCU part ;-)

Christophe,

The point here is to manage regulator for MPU and MCU. If you don't have 
MCU board it doesn't seem to be an issue as Ben proposed to test the 
patch for you.

> 
> Thanks
> 
> Christophe
> 
>>> -- 
>>> 2.25.1
>>>
>> Thanks, Ben