Re: [PATCH] arm64: dts: rockchip: set PHY address of MT7531 switch to 0x1f

[Heiko Stübner]

Am Donnerstag, 14. März 2024, 13:24:35 CET schrieb Arınç ÜNAL via B4 Relay:
> From: Arınç ÜNAL <arinc.unal@xxxxxxxxxx>
> 
> The MT7531 switch listens on PHY address 0x1f on an MDIO bus. I've got two
> findings that support this. There's no bootstrapping option to change the
> PHY address of the switch. The Linux driver hardcodes 0x1f as the PHY
> address of the switch. So the reg property on the device tree is currently
> ignored by the Linux driver.
> 
> Therefore, describe the correct PHY address on Banana Pi BPI-R2 Pro that
> has this switch.
> 
> Signed-off-by: Arınç ÜNAL <arinc.unal@xxxxxxxxxx>

Fixes: c1804463e5c6 ("arm64: dts: rockchip: Add mt7531 dsa node to BPI-R2-Pro board")

> ---
>  arch/arm64/boot/dts/rockchip/rk3568-bpi-r2-pro.dts | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3568-bpi-r2-pro.dts b/arch/arm64/boot/dts/rockchip/rk3568-bpi-r2-pro.dts
> index 7b5f3904ef61..03d6d920446a 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3568-bpi-r2-pro.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3568-bpi-r2-pro.dts
> @@ -525,9 +525,9 @@ &mdio0 {
>  	#address-cells = <1>;
>  	#size-cells = <0>;
>  
> -	switch@0 {
> +	switch@1f {
>  		compatible = "mediatek,mt7531";
> -		reg = <0>;
> +		reg = <0x1f>;
>  
>  		ports {
>  			#address-cells = <1>;
> 
> ---
> base-commit: 0276d797531ea2d1865a04fbe54c659608f5788f
> change-id: 20240314-for-rockchip-mt7531-phy-address-ba6c2fff485f
> 
> Best regards,
>