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

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Date: Thu, 14 Mar 2024 13:31:13 +0100
From: Heiko Stübner <heiko@...ech.de>
To: Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, arinc.unal@...nc9.com
Cc: mithat.guner@...ont.com, erkin.bozoglu@...ont.com,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Arınç ÜNAL <arinc.unal@...nc9.com>
Subject:
 Re: [PATCH] arm64: dts: rockchip: set PHY address of MT7531 switch to 0x1f

Am Donnerstag, 14. März 2024, 13:24:35 CET schrieb Arınç ÜNAL via B4 Relay:
> From: Arınç ÜNAL <arinc.unal@...nc9.com>
> 
> 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@...nc9.com>

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,
>