linux-kernel - Re: [PATCH AUTOSEL 4.19 32/73] ARM: dts: imx6sx-sdb: Fix enet phy regulator

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Message-ID: <20181122193405.GB9725@sasha-vm>
Date:   Thu, 22 Nov 2018 14:34:05 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     Leonard Crestez <leonard.crestez@....com>
Cc:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        Andy Duan <fugang.duan@....com>
Subject: Re: [PATCH AUTOSEL 4.19 32/73] ARM: dts: imx6sx-sdb: Fix enet phy
 regulator

On Thu, Nov 15, 2018 at 10:39:44AM +0000, Leonard Crestez wrote:
>On Wed, 2018-11-14 at 17:21 -0500, Sasha Levin wrote:
>> From: Leonard Crestez <leonard.crestez@....com>
>>
>> [ Upstream commit 1ad9fb750a104f51851c092edd7b3553f0218428 ]
>>
>> Bindings for "fixed-regulator" only explicitly support "gpio" property,
>> not "gpios". Fix by correcting the property name.
>>
>> The enet PHYs on imx6sx-sdb needs to be explicitly reset after a power
>> cycle, this can be handled by the phy-reset-gpios property. Sadly this
>> is not handled on suspend: the fec driver turns phy-supply off but
>> doesn't assert phy-reset-gpios again on resume.
>>
>> Since additional phy-level work is required to support powering off the
>> phy in suspend fix the problem by just marking the regulator as
>> "boot-on" "always-on" so that it's never turned off. This behavior is
>> equivalent to older releases.
>>
>> Keep the phy-reset-gpios property on fec anyway because it is a correct
>> description of board design.
>>
>> This issue was exposed by commit efdfeb079cc3 ("regulator: fixed:
>> Convert to use GPIO descriptor only") which causes the "gpios" property
>> to also be parsed. Before that commit the "gpios" property had no
>> effect, PHY reset was only handled in the the bootloader.
>>
>> Signed-off-by: Leonard Crestez <leonard.crestez@....com>
>> Signed-off-by: Shawn Guo <shawnguo@...nel.org>
>
>This is something of a workaround for gpio core changes in 4.20 and
>there is no need for it in older releases.
>
>I don't think you should backport this.

Dropped, thank you.

Thanks,
Sasha