linux-kernel - Re: [PATCH v3 02/06] devicetree: bindings: R-Car Gen2 CMT0 and CMT1 bindings

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Message-ID: <20160224051038.GB5435@verge.net.au>
Date:	Wed, 24 Feb 2016 14:10:38 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Magnus Damm <magnus.damm@...il.com>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Rob Herring <robh@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-renesas-soc@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3 02/06] devicetree: bindings: R-Car Gen2 CMT0 and CMT1
 bindings

On Wed, Feb 24, 2016 at 01:19:25PM +0900, Magnus Damm wrote:
> Hi Simon,
> 
> On Wed, Feb 17, 2016 at 9:08 PM, Simon Horman <horms@...ge.net.au> wrote:
> > On Wed, Feb 17, 2016 at 03:45:19PM +0900, Magnus Damm wrote:
> >> $ grep "renesas," Documentation/devicetree/bindings/dma/renesas,rcar-dmac.txt
> >> - compatible: "renesas,dmac-<soctype>", "renesas,rcar-dmac" as fallback.
> >>         - "renesas,dmac-r8a7790" (R-Car H2)
> >>         - "renesas,dmac-r8a7791" (R-Car M2-W)
> >>         - "renesas,dmac-r8a7792" (R-Car V2H)
> >>         - "renesas,dmac-r8a7793" (R-Car M2-N)
> >>         - "renesas,dmac-r8a7794" (R-Car E2)
> >>         - "renesas,dmac-r8a7795" (R-Car H3)
> >>         compatible = "renesas,dmac-r8a7790", "renesas,rcar-dmac";
> >>         compatible = "renesas,dmac-r8a7790", "renesas,rcar-dmac";
> >> $
> >
> > It looks like I have been making the mess worse :(
> >
> > Possibly I prepared the patch in question, though recently,
> > before I was properly aware of the preferred order.
> 
> No worries! The code above is at least consistent and matches the
> common current case.
> 
> >> No need to rework existing stuff IMO. However once we rework DT
> >> bindings (CMT) or add new ones (SYS-DMAC) then we have a good
> >> opportunity to clean things up.
> >
> > Understood. From my point of view that seems like an opportunity worth taking.
> 
> So shall we leave the SYS-DMAC as-is or change things around? I
> personally don't see the point in redoing things just to change order,
> so keep as-is sounds good to me.
> 
> For the "fallback" CMT DT compat strings I think we should follow the
> proposal from Geert and go with "renesas,rcar-gen2-cmt0". Regarding
> the per-soc CMT DT compat strings my feeling is that we should follow
> the same order as SYS-DMAC to keep things consistent.

I would lean towards changing the order of the per-soc CMT DT compat
strings but I do not feel strongly about it.

As for the rest of your proposal above: I agree without reservation.