linux-kernel - Re: [PATCH net-next 2/2] net: stmmac: platform: add support for phy-supply

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Message-ID: <9214ae14-b501-4d94-9d52-fd7dab2a86af@lunn.ch>
Date:   Tue, 18 Jul 2023 15:10:15 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        peppe.cavallaro@...com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, mcoquelin.stm32@...il.com,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de
Subject: Re: [PATCH net-next 2/2] net: stmmac: platform: add support for
 phy-supply

On Tue, Jul 18, 2023 at 10:38:41AM +0200, Marco Felsch wrote:
> On 23-07-18, Andrew Lunn wrote:
> > > +static int stmmac_phy_power(struct platform_device *pdev,
> > > +			    struct plat_stmmacenet_data *plat,
> > > +			    bool enable)
> > > +{
> > > +	struct regulator *regulator = plat->phy_regulator;
> > > +	int ret = 0;
> > > +
> > > +	if (regulator) {
> > > +		if (enable)
> > > +			ret = regulator_enable(regulator);
> > > +		else
> > > +			regulator_disable(regulator);
> > > +	}
> > > +
> > > +	if (ret)
> > > +		dev_err(&pdev->dev, "Fail to enable regulator\n");
> > 
> > 'enable' is only correct 50% of the time.
> 
> You mean to move it under the enable path.

Or don't use the word 'enable'. 'modify' ?

> Good point didn't consider WOL. Is there a way to check if WOL is
> enabled?

Yes, plenty of MAC drivers do this. Look around.

     Andrew