[PATCH net-next 0/2] remove Kconfig sysmbol MDIO_BUS

[PATCH net-next 0/2] remove Kconfig sysmbol MDIO_BUS

[Heiner Kallweit]

MDIO-based regmap is the last user of config symbol MDIO_BUS.
MDIO access needs a MII bus, which requires PHYLIB for the provider part.
Therefore make REGMAP_MDIO depend on PHYLIB, what allows to remove
config symbol MDIO_BUS.

Heiner Kallweit (2):
  regmap: mdio: make it depend on PHYLIB
  net: phy: remove Kconfig sysmbol MDIO_BUS

 drivers/base/regmap/Kconfig | 2 +-
 drivers/net/phy/Kconfig     | 6 ------
 drivers/net/phy/Makefile    | 2 +-
 3 files changed, 2 insertions(+), 8 deletions(-)

-- 
2.53.0

[PATCH net-next 1/2] regmap: mdio: make it depend on PHYLIB

[Heiner Kallweit]

MDIO-based regmap is the last user of config symbol MDIO_BUS.
MDIO access needs a MII bus, which requires PHYLIB for the provider part.
Therefore make REGMAP_MDIO depend on PHYLIB, what allows to remove
config symbol MDIO_BUS in a follow-up patch.

Note: After c5a219395b4e ("regmap: Move selecting for REGMAP_MDIO and
      REGMAP_IRQ") switching to "depends on" should be fine, w/o risk
      of a circular dependency.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/base/regmap/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig
index 06d7eb2aac1..3c76a5bf67b 100644
--- a/drivers/base/regmap/Kconfig
+++ b/drivers/base/regmap/Kconfig
@@ -56,7 +56,7 @@ config REGMAP_W1
 
 config REGMAP_MDIO
 	tristate
-	select MDIO_BUS
+	depends on PHYLIB
 
 config REGMAP_MMIO
 	tristate
-- 
2.53.0

[PATCH net-next 2/2] net: phy: remove Kconfig symbol MDIO_BUS

[Heiner Kallweit]

After usage of config symbol MDIO_BUS has been removed from REGMAP_MIO
as last user, the symbol can be removed.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/phy/Kconfig  | 6 ------
 drivers/net/phy/Makefile | 2 +-
 2 files changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 7b73332a13d..b5ee338b620 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -3,11 +3,6 @@
 # PHY Layer Configuration
 #
 
-config MDIO_BUS
-	tristate "MDIO bus consumer layer"
-	help
-	  MDIO bus consumer layer
-
 config PHYLINK
 	tristate
 	select PHYLIB
@@ -19,7 +14,6 @@ config PHYLINK
 
 menuconfig PHYLIB
 	tristate "PHY Device support and infrastructure"
-	select MDIO_BUS
 	help
 	  Ethernet controllers are usually attached to PHY
 	  devices.  This option provides infrastructure for
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 8d262b4e2be..05e4878af27 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -15,7 +15,7 @@ libphy-$(CONFIG_SWPHY)		+= swphy.o
 libphy-$(CONFIG_LED_TRIGGER_PHY)	+= phy_led_triggers.o
 libphy-$(CONFIG_OPEN_ALLIANCE_HELPERS) += open_alliance_helpers.o
 
-obj-$(CONFIG_MDIO_BUS)		+= mdio_bus.o
+obj-$(CONFIG_PHYLIB)		+= mdio_bus.o
 obj-$(CONFIG_PHYLINK)		+= phylink.o
 obj-$(CONFIG_PHYLIB)		+= libphy.o
 obj-$(CONFIG_PHYLIB)		+= mdio_devres.o
-- 
2.53.0

Re: [PATCH net-next 1/2] regmap: mdio: make it depend on PHYLIB

[Mark Brown]

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On Sun, Mar 15, 2026 at 05:48:43PM +0100, Heiner Kallweit wrote:
> MDIO-based regmap is the last user of config symbol MDIO_BUS.
> MDIO access needs a MII bus, which requires PHYLIB for the provider part.
> Therefore make REGMAP_MDIO depend on PHYLIB, what allows to remove
> config symbol MDIO_BUS in a follow-up patch.

Acked-by: Mark Brown <broonie@kernel.org>

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Re: [PATCH net-next 1/2] regmap: mdio: make it depend on PHYLIB

[Jakub Kicinski]

On Sun, 15 Mar 2026 17:48:43 +0100 Heiner Kallweit wrote:
>  config REGMAP_MDIO
>  	tristate
> -	select MDIO_BUS
> +	depends on PHYLIB

The REGMAP_MDIO symbol seems to have no user in the first place?
I'd have expected any driver that practically needs it to select it.
What am I missing?

Re: [PATCH net-next 1/2] regmap: mdio: make it depend on PHYLIB

[Mark Brown]

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On Tue, Mar 17, 2026 at 04:28:43PM -0700, Jakub Kicinski wrote:
> On Sun, 15 Mar 2026 17:48:43 +0100 Heiner Kallweit wrote:

> >  config REGMAP_MDIO
> >  	tristate
> > -	select MDIO_BUS
> > +	depends on PHYLIB

> The REGMAP_MDIO symbol seems to have no user in the first place?
> I'd have expected any driver that practically needs it to select it.
> What am I missing?

Nothing, that's how it's supposed to work.  I don't tend to block new
buses on their users being added since it just makes merging a bit more
complicated (or possibly the user has been and gone).

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Re: [PATCH net-next 0/2] remove Kconfig sysmbol MDIO_BUS

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Sun, 15 Mar 2026 17:47:47 +0100 you wrote:
> MDIO-based regmap is the last user of config symbol MDIO_BUS.
> MDIO access needs a MII bus, which requires PHYLIB for the provider part.
> Therefore make REGMAP_MDIO depend on PHYLIB, what allows to remove
> config symbol MDIO_BUS.
> 
> Heiner Kallweit (2):
>   regmap: mdio: make it depend on PHYLIB
>   net: phy: remove Kconfig sysmbol MDIO_BUS
> 
> [...]

Here is the summary with links:
  - [net-next,1/2] regmap: mdio: make it depend on PHYLIB
    https://git.kernel.org/netdev/net-next/c/e611a97032f0
  - [net-next,2/2] net: phy: remove Kconfig symbol MDIO_BUS
    https://git.kernel.org/netdev/net-next/c/91283bd5b008

You are awesome, thank you!
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