Re: [PATCH] net: fec: make FIXED_PHY dependency unconditional

[Simon Horman <horms@kernel.org>]

On Thu, Apr 02, 2026 at 04:10:40PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> When CONFIG_FIXED_PHY is in a loadable module, the fec driver cannot be
> built-in any more:
> 
> x86_64-linux-ld: vmlinux.o: in function `fec_enet_mii_probe':
> fec_main.c:(.text+0xc4f367): undefined reference to `fixed_phy_unregister'
> x86_64-linux-ld: vmlinux.o: in function `fec_enet_close':
> fec_main.c:(.text+0xc59591): undefined reference to `fixed_phy_unregister'
> x86_64-linux-ld: vmlinux.o: in function `fec_enet_mii_probe.cold':
> 
> Select the fixed phy support on all targets to make this build
> correctly, not just on coldfire.
> 
> Notat that Essentially the stub helpers in include/linux/phy_fixed.h
> cannot be used correctly because of this build time dependency,
> and we could just remove them to hit the build failure more often
> when a driver uses them without the 'select FIXED_PHY'.
> 
> Fixes: dc86b621e1b4 ("net: fec: register a fixed phy using fixed_phy_register_100fd if needed")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> I sent the same fix for B44 earlier, see commit 3f0f591b44b0 ("net: b44:
> always select CONFIG_FIXED_PHY"). I checked that there are no other
> conditional users of FIXED_PHY this time.

Reviewed-by: Simon Horman <horms@kernel.org>