linux-kernel - Re: [PATCH v2 13/18] arm64: dts: mediatek: mt7988: add i2c to bpi-r4 board

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Message-ID: <b12e215af5aa5b6bb2fadbeda1117c94@fw-web.de>
Date: Tue, 03 Dec 2024 16:28:25 +0100
From: "Frank Wunderlich (linux)" <linux@...web.de>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: frank-w@...lic-files.de, Rob Herring <robh@...nel.org>, Krzysztof
 Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Matthias
 Brugger <matthias.bgg@...il.com>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 13/18] arm64: dts: mediatek: mt7988: add i2c to bpi-r4
 board

Am 2024-12-03 15:22, schrieb AngeloGioacchino Del Regno:
> Il 03/12/24 11:58, Frank Wunderlich ha scritto:
>> Am 3. Dezember 2024 10:40:38 MEZ schrieb AngeloGioacchino Del Regno 
>> <angelogioacchino.delregno@...labora.com>:
>>> Il 02/12/24 13:25, Frank Wunderlich ha scritto:
>>>> From: Frank Wunderlich <frank-w@...lic-files.de>
>>>> 
>>>> Add basic i2c nodes to bananapi R4 board.
>>>> 
>>>> Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
>>> 
>>> arm64: dts: mediatek: mt7988a-bpi-r4: Enable I2C controllers
>>> 
>>> Enable the I2C0, I2C2 controllers found on the BananaPi R4 board; 
>>> these
>>> controllers are accessible at ... I don't know, a header on the 
>>> board?
>> 
>> These 2 i2c have directly connected spare devices (pmic on i2c0 and 
>> i2c-mux on i2c2 added in later commits to have it a bit cleaner). I2c1 
>> is on gpio header which i have not added to let user choose if he 
>> wants i2c option or gpio. I can also add i2c1 to r4 board with the 
>> right pinctrl but imho it should be disabled to have gpio function 
>> default.
> 
> And again, you should really add all that information to the commit 
> description,
> as that not only helps me to review your submission, but also helps 
> other people
> checking the commit history....!

this ine i would rephrase like this

     arm64: dts: mediatek: mt7988a-bpi-r4: Enable I2C controllers

     Enable the I2C0, I2C2 controllers found on the BananaPi R4 board.
     Both controllers are not accessible from user and having fixed spare
     devices. I2C0 have a pmic connected, I2C2 is used with 
I2C-multiplexer
     for e.g. SFP cages.
     The missing I2C1 is connected to GPIO header which can have either 
GPIO
     mode or I2C mode.


> Cheers
> 
>> 
>>> After which,
>>> 
>>> Reviewed-by: AngeloGioacchino Del Regno 
>>> <angelogioacchino.delregno@...labora.com>
>>> 
>>> 
>> 
>> 
>> regards Frank