linux-kernel - Re: [PATCH 1/2] spi: spidev: Add Qualcomm spidev device compatible

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Date: Tue, 6 Feb 2024 13:11:53 +0000
From: Mark Brown <broonie@...nel.org>
To: frut3k7 <frut3k7@...il.com>
Cc: Robert Marko <robimarko@...il.com>, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] spi: spidev: Add Qualcomm spidev device compatible

On Tue, Feb 06, 2024 at 02:01:27PM +0100, frut3k7 wrote:
> On Tue, Feb 6, 2024 at 10:37 AM Mark Brown <broonie@...nel.org> wrote:
> > On Mon, Feb 05, 2024 at 08:18:05PM +0100, Paweł Owoc wrote:

> > > +     { .compatible = "qca,spidev", .data = &spidev_of_check },

> > No, this needs to correspond to the hardware being controlled via spidev
> > not to an implementation detail.  Any new compatibles also need to be
> > documented.

> The device for which I want to add compatibility is originally used in the
> router and this is what the dts fragment looks like:

> 
>       spi@3 {
>         compatible = "qca,spidev";
>         reg = <0x00>;
>         spi-max-frequency = <0x16e3600>;
>       };
>     };

> According to this commit, Qualcomm use this compatibility:
> https://github.com/dissent1/msm-2/commit/d6160218393552fea1b7973787f2bd154f870ee2

This is out of tree, it's not exactly a good guide for mainline.  The DT
should describe the hardware, not how some particular software stack
chooses to drive it.

> > I'm also missing patch 2 of this series so don't know what's going on
> > there.

> The second patch was sent only to the devicetree bindings project:
> https://lore.kernel.org/all/20240205191828.998783-1-frut3k7@gmail.com/
> It's probably done wrong...

You should send the bindings change along with the driver change, they
usually get merged together.

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