linux-kernel - Re: [PATCH 2/4] phy: s32g: Add serdes subsystem phy

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Message-ID: <aXtl6eQ8zD_olTdc@shell.armlinux.org.uk>
Date: Thu, 29 Jan 2026 13:51:37 +0000
From: "Russell King (Oracle)" <linux@...linux.org.uk>
To: Vincent Guittot <vincent.guittot@...aro.org>, vkoul@...nel.org,
	neil.armstrong@...aro.org
Cc: Simon Horman <horms@...nel.org>, krzk+dt@...nel.org,
	conor+dt@...nel.org, ciprianmarian.costea@....nxp.com, s32@....com,
	p.zabel@...gutronix.de, ghennadi.procopciuc@....com,
	Ionut.Vicovan@....com, linux-phy@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	Frank.li@....com
Subject: Re: [PATCH 2/4] phy: s32g: Add serdes subsystem phy

On Thu, Jan 29, 2026 at 02:36:01PM +0100, Vincent Guittot wrote:
> On Thu, 29 Jan 2026 at 14:23, Russell King (Oracle)
> <linux@...linux.org.uk> wrote:
> >
> > On Thu, Jan 29, 2026 at 02:01:13PM +0100, Vincent Guittot wrote:
> > > yes, the usual pattern is :
> > > - phy_set_mode_ext()
> > > - then phy_power_on()
> > > but I can add an additional check
> >
> > Please read Documentation/driver-api/phy/phy.rst section "Order of API
> > calls" which suggests phy_set_mode_ext() after phy_power_on().
> 
> Fair enough.
> That being said, all pcie drivers  that use phy_set_mode_ext(), call
> it before phy_power_on()

It looks like many ethernet drivers do the same, so I think maybe the
generic PHY documentation is incorrect or misleading, or is expressing
a preference that almost no one follows. Something for the generic PHY
maintainers to look at and/or comment on.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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