linux-kernel - Re: [PATCH 2/2] include: dt-bindings: rockchip: remove RK

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Message-ID: <2623685.EsipSBtvXi@phil>
Date:   Tue, 15 Oct 2019 22:32:30 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     Johan Jonker <jbx6244@...il.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] include: dt-bindings: rockchip: remove RK_FUNC defines

Am Dienstag, 15. Oktober 2019, 22:26:14 CEST schrieb Johan Jonker:
> Hi Heiko,
> 
> What's the plan for RK_FUNC_GPIO ? Change all to '0' or keep it?

RK_FUNC_GPIO I'd like to keep :-) .

Basic rationale is that mapping RK_FUNC_1 -> 1, RK_FUNC_2 -> 2, etc does
not provide any additional value, while telling it explicitly that we're
mapping to the gpio function does.

Heiko

> 
> On 10/15/19 10:10 PM, Heiko Stuebner wrote:
> > Hi Johan,
> > 
> > Am Dienstag, 15. Oktober 2019, 21:10:00 CEST schrieb Johan Jonker:
> >> The defines RK_FUNC_1, RK_FUNC_2, RK_FUNC_3 and RK_FUNC_4
> >> are no longer used, so remove them to prevent
> >> that someone start using them again.
> > 
> > That won't work. Devicetree provides a slightly flexible promise of
> > backwards compatibilty. So a new kernel should still work old devicetrees.
> > (not exactly sure if this means dt-binaries and sources or only binaries)
> > 
> > So while I think RK_FUNC_0-n should not be used anymore, we should
> > probably just mark them as "deprecated" in a first step.
> > 
> > 
> > Heiko
> 
>