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

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Date: Thu, 14 Mar 2024 15:37:19 +0300
From: Arınç ÜNAL <arinc.unal@...nc9.com>
To: Heiko Stübner <heiko@...ech.de>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
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
Subject: Re: [PATCH] arm64: dts: rockchip: set PHY address of MT7531 switch to
 0x1f

Hello Heiko.

On 14.03.2024 15:31, Heiko Stübner wrote:
> 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")

Do I need to resubmit with this added, or would you add it while applying
the patch?

Arınç