linux-kernel - Re: [PATCH 2/3] dt-bindings: spi: Add DT schema for Tegra SPIDEV controller

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Message-ID: <fe03cadf-6f3e-4a26-82ce-8027e90bbdec@sirena.org.uk>
Date: Tue, 25 Mar 2025 13:57:43 +0000
From: Mark Brown <broonie@...nel.org>
To: Thierry Reding <thierry.reding@...il.com>
Cc: Jon Hunter <jonathanh@...dia.com>, Vishwaroop A <va@...dia.com>,
	krzk+dt@...nel.org, robh@...nel.org, conor+dt@...nel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-spi@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: spi: Add DT schema for Tegra SPIDEV
 controller

On Tue, Mar 25, 2025 at 01:45:26PM +0100, Thierry Reding wrote:
> On Tue, Mar 25, 2025 at 12:10:19PM +0000, Mark Brown wrote:
> > On Tue, Mar 25, 2025 at 10:36:29AM +0000, Jon Hunter wrote:

> > > We finally got back to this. Looks like just having 'spidev' as the
> > > compatible does not work. Apparently, it use to work and yes you would get
> > > the warning, but that no longer seems to be the case. I see a few others
> > > have been doing similar things and hacking their device-trees in different
> > > ways [0].

> > Huh, OK.  I don't recall any deliberate SPI change for that.

> People in the discussion that Jon linked to indicated that it was this
> patch that caused the "regression":

...

> If you say that the regression wasn't deliberate, maybe we should look
> at fixing this so that people don't have to work around stuff?

I mean, we don't want people to be doing this which is why it generates
the warning - it's more tolerated than supported.  I don't super mind
keeping it so long as it's not getting in the way of all the fragility
with the enumeration stuff.

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