[PATCH] bcm53xx: disable CONFIG_SWCONFIG_B53_PHY_DRIVER

[Rafał Miłecki]

Cc Tobias, author of the 8f9cd1af0f9c ("swconfig: fix Broadcom b53 support").

Another option would be to revert above commit (.of_match_table part anyway).

On 30.09.2021 16:40, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal at milecki.pl>
> 
> OpenWrt downstream b53 MDIO driver is bugged as it:
> 1. Registers as PHY device driver (while switch is an MDIO device)
> 2. Provides of_match_table
> 
> That results in bypassing kernel bus matching checks and probing b53 for
> MDIO device treated as PHY device. It doesn't work as PHY structure
> isn't initialized and phy_probe() causes a softlock.
> 
> This happened to work with kernel 5.4 but some internal change revealed
> that broken design.
> 
> For bcm53xx this shouldn't be critical as only Linksys EA9500 extra
> switch is connected using MDIO.
> 
> Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
> ---
>   target/linux/bcm53xx/config-5.10 | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/target/linux/bcm53xx/config-5.10 b/target/linux/bcm53xx/config-5.10
> index 9d98e812bd..e495419aad 100644
> --- a/target/linux/bcm53xx/config-5.10
> +++ b/target/linux/bcm53xx/config-5.10
> @@ -268,8 +268,7 @@ CONFIG_SPI_MEM=y
>   CONFIG_SRCU=y
>   CONFIG_SWCONFIG=y
>   CONFIG_SWCONFIG_B53=y
> -CONFIG_SWCONFIG_B53_PHY_DRIVER=y
> -CONFIG_SWCONFIG_B53_PHY_FIXUP=y
> +# CONFIG_SWCONFIG_B53_PHY_DRIVER is not set
>   CONFIG_SWCONFIG_B53_SRAB_DRIVER=y
>   CONFIG_SWPHY=y
>   CONFIG_SWP_EMULATE=y
>