linux-kernel - Re: [PATCH 1/2] arm64: dts: rockchip: add spi controller aliases on rk3399

Open Source and information security mailing list archives

Date: Tue, 09 Jan 2024 17:14:41 +0100
From: Dragan Simic <dsimic@...jaro.org>
To: Heiko Stübner <heiko@...ech.de>
Cc: Quentin Schulz <foss+kernel@...il.net>, Rob Herring
 <robh+dt@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, Quentin
 Schulz <quentin.schulz@...obroma-systems.com>
Subject: Re: [PATCH 1/2] arm64: dts: rockchip: add spi controller aliases on
 rk3399

On 2024-01-09 16:22, Heiko Stübner wrote:
> Am Dienstag, 9. Januar 2024, 16:15:30 CET schrieb Krzysztof Kozlowski:
>> On 09/01/2024 14:35, Quentin Schulz wrote:
>> > From: Quentin Schulz <quentin.schulz@...obroma-systems.com>
>> >
>> > There are 6 SPI controllers on RK3399 and they are all numbered in the
>> > TRM, so let's add the appropriate aliases to the main DTSI so that any
>> > RK3399-based board doesn't need to define the aliases themselves to
>> > benefit from stable SPI indices in userspace.
>> 
>> But that contradicts the point that board should define aliases for
>> exposable interfaces. Sorry, that's a NAK.
> 
> didn't we have this same discussion some weeks ago? ;-) .
> 
> I.e. spi2 on Rockchip socs is called spi2 in _all_ SoC documentation,
> lines in _all_ schematics are also always called spi2_foo , so as 
> before
> I really don't see any value in repeating the very same aliases in
> _every_ board.
> 
> Same for i2c, uart .

Yes, and the RK356x SoC dtsi already defines the spiX aliases in the 
same way as Quentin proposed.  Taking that as an additional example, the 
RK3399 dtsi can do the same.

> It is of course different for non-numerable interfaces - like the mmcX
> aliases - where the controller is named sdhci, sdmmc, sdio ... and
> similar cases. These get to stay in the board dts files of course.
> 
> 
> Heiko
> 
>> > Cc: Quentin Schulz <foss+kernel@...il.net>
>> 
>> No need to Cc yourself...
>> 
>> > Signed-off-by: Quentin Schulz <quentin.schulz@...obroma-systems.com>
>> > ---
>> 
>> Best regards,
>> Krzysztof
>> 
>> 
> 
> 
> 
> 
> 
> _______________________________________________
> Linux-rockchip mailing list
> Linux-rockchip@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-rockchip

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