linux-kernel - Re: [PATCH 1/3] dt-bindings: spi: Update clocks property for ARM pl022

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Date:   Mon, 28 Feb 2022 15:11:26 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Kuldeep Singh <singh.kuldeep87k@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 1/3] dt-bindings: spi: Update clocks property for ARM
 pl022

On Mon, Feb 28, 2022 at 02:26:12PM +0000, Robin Murphy wrote:

> Who says that minItems is missing? Looking at the PL022 TRM[1] it seems
> clear that SSPCLK is pretty fundamental to useful operation. If that DT ever
> worked, it must be that the same clock is wired to both inputs, and the fact
> that that's how the neighbouring PL011 is described is strongly suggestive.

Well, it could also be that the clock is wired to some other clock which
is always on (which I guess is why the driver allows this in the first
place, there's a lot of sloppy code around stuff like that in the tree).

> If the point of schema is to find errors in DTs, doesn't it make more sense
> to fix the DTs than to weaken the schema just to shut it up?

I do agree on this point though, given that the clock is actually
required for useful operation what's happening here is that the schema
is detecting an error in the use of the binding.

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