linux-kernel - Re: [PATCH] powerpc/devicetrees: Change 'gpios' to 'cs-gpios' on fsl,spi nodes

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Date:   Sat, 14 Dec 2019 08:30:11 +0100
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Rob Herring <robh@...nel.org>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Mark Rutland <mark.rutland@....com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, devicetree@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH] powerpc/devicetrees: Change 'gpios' to 'cs-gpios' on
 fsl,spi nodes



Le 13/12/2019 à 22:34, Rob Herring a écrit :
> On Thu, Nov 28, 2019 at 12:16:35PM +0000, Christophe Leroy wrote:
>> Since commit 0f0581b24bd0 ("spi: fsl: Convert to use CS GPIO
>> descriptors"), the prefered way to define chipselect GPIOs is using
>> 'cs-gpios' property instead of the legacy 'gpios' property.
> 
> This will break using a new dtb on a kernel without the above commit. Or
> with any OS that never made the change.

Why would anybody use a new dtb on an old kernel ? I have not tagged 
this change for stable, it will only apply to DTBs in new kernels, won't 
it ?

That's not the first time DTS have to change for new kernels. For 
instance, some time ago I had to replace all 'gpios' property by a set 
of 'rdy-gpio', 'nce-gpio', 'ale-gpio' and 'cle-gpio' properties to 
continue using 'gpio-control-nand' driver.

> 
> I'm fine with the doc change, but you should keep 'gpios' as deprecated.

Ok

Christophe