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

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Message-ID: <ZRWfhk0aEDwytGv5@dell-precision-5540>
Date:   Thu, 28 Sep 2023 11:45:10 -0400
From:   Ben Wolsieffer <ben.wolsieffer@...ring.com>
To:     Christophe Roullier <christophe.roullier@...s.st.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

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.

> -- 
> 2.25.1
> 

Thanks, Ben