linux-kernel - Re: [PATCH v5 net-next 08/13] net: phy: marvell-88q2xxx: add support for temperature sensor

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Message-ID: <5fdc3741-c169-4457-bffa-dab3d2ee42fe@roeck-us.net>
Date: Thu, 1 Feb 2024 10:22:38 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Dimitri Fedrau <dima.fedrau@...il.com>
Cc: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Jean Delvare <jdelvare@...e.com>,
	Stefan Eichenberger <eichest@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH v5 net-next 08/13] net: phy: marvell-88q2xxx: add support
 for temperature sensor

On Thu, Feb 01, 2024 at 05:23:49PM +0100, Dimitri Fedrau wrote:
> Am Thu, Feb 01, 2024 at 05:39:25AM -0800 schrieb Guenter Roeck:
> > On 2/1/24 05:27, Andrew Lunn wrote:
> > > > > +#ifdef CONFIG_HWMON
> > > > 
> > > > HWMON is tristate, so this may be problematic if the driver is built
> > > > into the kernel and hwmon is built as module.
> > > 
> > > There should be Kconfig in addition to this, e.g.
> > > 
> > > config MAXLINEAR_GPHY
> > >          tristate "Maxlinear Ethernet PHYs"
> > >          select POLYNOMIAL if HWMON
> > >          depends on HWMON || HWMON=n
> > >          help
> > >            Support for the Maxlinear GPY115, GPY211, GPY212, GPY215,
> > >            GPY241, GPY245 PHYs.
> > > 
> > > So its forced to being built in, or not built at all.
> > > 
> > 
> > Even then it should be "#if IS_ENABLED(HWMON)" in the code.
> > 
> >
> If using "#if IS_ENABLED(HWMON)" do I have to add the dependency in
> the KConfig file ? When looking at other PHY drivers, they do.

Yes, to handle CONFIG_HWMON=m. Note that it is "IS_ENABLED(CONFIG_HWMON)"
      				                           ^^^^^^^

Guenter