linux-kernel - Re: [PATCH v1 3/6] spi: pxa2xx: Remove no more needed PCI ID table

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Date:   Fri, 21 Oct 2022 13:28:52 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>
Subject: Re: [PATCH v1 3/6] spi: pxa2xx: Remove no more needed PCI ID table

On Fri, Oct 21, 2022 at 02:15:59PM +0300, Andy Shevchenko wrote:
> On Fri, Oct 21, 2022 at 11:59:20AM +0100, Mark Brown wrote:

> > On DT based systems resources can be named by the firmware, I don't know
> > if that's possible with ACPI but as the name suggests the driver gets
> > used on PXA systems too.

> And how is it related to DT if the enumeration happens via platform driver
> code? As for PXA this is all comes via board files:

...

> In the current code and after my patch series the priority is that
> the driver data from the spi-pxa2xx.c is the first. So, if compatible
> (which is by fact the only "marvell,mmp2-ssp") has named resources
> that exactly the same as LPSS for MFD, nothing will change the driver
> behaviour.

> For the ACPI there is no names for the resources so far.

It's not so much does this work now as will this clearly work in future
when someone changes something, and will any changes that are concerning
be likely to set off alarm bells.  I'm sure it works fine now.

BTW the new property isn't added to the binding document, though this
case is a bit iffy given that the intent is apparently that it not be
added to the document since this is basically working around the issues
with ACPI not being terribly descriptive, the property is very much not
idiomatic for DT.  Having it in the binding document might actually end
up being an issue - from that point of view it'd be good if we had a
namespace for things that should never appear in DT that didn't look
like a DT namespace.

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