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

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Message-ID: <c8804fbe-46e7-2771-e503-4e786df2f97c@foss.st.com>
Date:   Thu, 5 Oct 2023 13:27:18 +0200
From:   Christophe ROULLIER <christophe.roullier@...s.st.com>
To:     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>,
        Alexandre Torgue <alexandre.torgue@...s.st.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 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 ;-)

Thanks

Christophe

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