netdev - Re: [PATCH 3/6] net: stmmac: sun8i: Use devm_regulator

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Date:   Tue, 20 Aug 2019 17:56:48 +0200
From:   Ondřej Jirman <megous@...ous.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/6] net: stmmac: sun8i: Use devm_regulator_get for PHY
 regulator

On Tue, Aug 20, 2019 at 05:39:39PM +0200, Andrew Lunn wrote:
> On Tue, Aug 20, 2019 at 04:53:40PM +0200, megous@...ous.com wrote:
> > From: Ondrej Jirman <megous@...ous.com>
> > 
> > Use devm_regulator_get instead of devm_regulator_get_optional and rely
> > on dummy supply. This avoids NULL checks before regulator_enable/disable
> > calls.
> 
> Hi Ondrej
> 
> What do you mean by a dummy supply? I'm just trying to make sure you
> are not breaking backwards compatibility.

I have tested it on Orange Pi PC 2, that uses only phy-supply, but not
phy-io-supply, and the kernel now prints:

[    1.410137] dwmac-sun8i 1c30000.ethernet: 1c30000.ethernet supply phy-io not found, using dummy regulator

I have also tested it on Orange Pi PC, that doesn't use external phy, and
instead of:

[    1.081378] dwmac-sun8i 1c30000.ethernet: No regulator found

The kernel now prints:

[    1.112752] dwmac-sun8i 1c30000.ethernet: 1c30000.ethernet supply phy not found, using dummy regulator
[    1.112814] dwmac-sun8i 1c30000.ethernet: 1c30000.ethernet supply phy-io not found, using dummy regulator

Ethernet works in both cases, so that should cover all existing combinations. :)

regards,
	Ondrej


>      Thanks
> 	Andrew