From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f193.google.com ([209.85.223.193]:34780 "EHLO mail-io0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S942350AbdDTLkG (ORCPT ); Thu, 20 Apr 2017 07:40:06 -0400 MIME-Version: 1.0 In-Reply-To: <2338736.vqmUpXt7la@avalon> References: <1492681746-20005-1-git-send-email-geert+renesas@glider.be> <3839999.H9bRVaxdVd@avalon> <2338736.vqmUpXt7la@avalon> From: Geert Uytterhoeven Date: Thu, 20 Apr 2017 13:40:04 +0200 Message-ID: Subject: Re: [PATCH] pinctrl: sh-pfc: r8a7796: Add group for AVB MDIO and MII pins To: Laurent Pinchart Cc: Geert Uytterhoeven , Linus Walleij , =?UTF-8?Q?Niklas_S=C3=B6derlund?= , Linux-Renesas , "linux-gpio@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-renesas-soc-owner@vger.kernel.org List-ID: Hi Laurent, (this time reply to all) On Thu, Apr 20, 2017 at 12:18 PM, Laurent Pinchart wrote: > 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. Like, from v4.4 (when avb_mdc was added for H3) until v4.12 (earliest we can correct this)? Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds