linux-kernel - Re: [PATCH 1/2] ARM: dts: spear13xx: Update SPI dma properties

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Date:   Mon, 14 Mar 2022 16:13:36 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Kuldeep Singh <singh.kuldeep87k@...il.com>,
        SoC Team <soc@...nel.org>, Viresh Kumar <vireshk@...nel.org>,
        Shiraz Hashim <shiraz.linux.kernel@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] ARM: dts: spear13xx: Update SPI dma properties

On 14-03-22, 11:27, Arnd Bergmann wrote:
> I don't think that it was meant to have a fixed order: unlike the other
> bindings that define xxx-names properties, dmas require giving
> names to allow the DT to specify more than one possible DMA
> specifier for a given name. This means that nothing may ever just
> rely on an index but has to use the name for lookup.

Is there a way to update the yaml or tooling in that case so it doesn't expect a
fixed order ?

> OTOH, while fixing the order in the binding does not add any
> value, it's also harmless as this should never be able to break
> anything that worked for any combination of old/new dtb and
> kernel, and it's probably easier to express in the binding.

I agree, but such a patch shouldn't be required at all, which caught my
attention. It is fine to merge it and won't break anything, but it shouldn't be
required as well.

-- 
viresh