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From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "Geert Uytterhoeven" <geert+renesas@glider.be>,
	"Linus Walleij" <linus.walleij@linaro.org>,
	"Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>
Subject: Re: [PATCH] pinctrl: sh-pfc: r8a7796: Add group for AVB MDIO and MII pins
Date: Thu, 20 Apr 2017 13:18:01 +0300	[thread overview]
Message-ID: <2338736.vqmUpXt7la@avalon> (raw)
In-Reply-To: <CAMuHMdWYWWVuFWz7kULLbZeOxVAssFQ584cO45THrLQ6FwTYSA@mail.gmail.com>

Hi Geert,

On Thursday 20 Apr 2017 12:11:41 Geert Uytterhoeven wrote:
> On Thu, Apr 20, 2017 at 12:02 PM, Laurent Pinchart wrote:
> > On Thursday 20 Apr 2017 11:49:06 Geert Uytterhoeven wrote:
> >> Group the AVB pins into similar groups as found in other sh-pfc drivers.
> >> The pins can not be muxed between functions other than AVB, but their
> >> drive strengths can be controlled.
> >> 
> >> The group avb_mdc containing ADV_MDC and ADV_MDIO is called avb_mdio on
> >> other SoCs.  In pfc-r8a7796 the avb_mdc group already existed and is in
> >> use in DT. Therefore add the ADV_MDIO pin to the existing group instead
> >> of renaming it.
> > 
> > This clearly shows that we need a few kernel releases to test PFC-related
> > code and DT before we can commit to an ABI. How do you think we should
> > handle this ?
> 
> That's a difficult question ;-)
> 
> For now I'd like to treat R-Car M3-W the same as H3.

I still believe we should introduce some kind of unstable period for DT 
bindings, during which they will be merged in mainline but still subject to 
modification. It could just be a few kernel releases.

-- 
Regards,

Laurent Pinchart


  reply	other threads:[~2017-04-20 10:17 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-20  9:49 [PATCH] pinctrl: sh-pfc: r8a7796: Add group for AVB MDIO and MII pins Geert Uytterhoeven
2017-04-20 10:02 ` Laurent Pinchart
2017-04-20 10:11   ` Geert Uytterhoeven
2017-04-20 10:18     ` Laurent Pinchart [this message]
2017-04-20 11:40       ` Geert Uytterhoeven
2017-04-20 11:44         ` Laurent Pinchart
2017-04-20 11:47           ` Geert Uytterhoeven
2017-05-02 14:33             ` Niklas Söderlund
2017-05-02 14:33               ` Niklas Söderlund
2017-05-11  8:49               ` Geert Uytterhoeven

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