From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Pinchart Subject: Re: [RFC 0/5] Renesas RZ series pinctrl driver Date: Mon, 30 Jan 2017 20:59:58 +0200 Message-ID: <1834948.XJ6SzFDPBZ@avalon> References: <1485367787-8109-1-git-send-email-jacopo+renesas@jmondi.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Return-path: In-Reply-To: Sender: linux-renesas-soc-owner@vger.kernel.org To: Geert Uytterhoeven Cc: Linus Walleij , Jacopo Mondi , ext Tony Lindgren , Geert Uytterhoeven , Linux-Renesas , "linux-gpio@vger.kernel.org" List-Id: linux-gpio@vger.kernel.org Hi Geert, On Monday 30 Jan 2017 17:08:11 Geert Uytterhoeven wrote: > On Mon, Jan 30, 2017 at 2:51 PM, Linus Walleij wrote: > > On Wed, Jan 25, 2017 at 7:09 PM, Jacopo Mondi wrote: > >> after having discussed in great detail the RZ series per-pin PFC > >> hardware peculiarities, this is a proposal for a possible pin-based pin > >> controller driver for SoC devices of Renesas RZ family. > >> > >> This RFC series adds a minimal driver infrastructure which supports pin > >> multiplexing via explicit per-pin settings performed in device tree > >> sources. > > > > I think this is what Laurent had in mind when he said something about > > that he should have taken the per-pin approach from day 1. > > > > I would especially like to see Laurent's review and ACK on this series > > for that reason so we don't create something less than what he is > > expecting for the future of Renesas pin control. > > It depends on the actual hardware: while per-pin settings are suitable for > SoCs that have per-pin hardware configuration (e.g. RZ/A1), it's not > suitable for SoCs where that's not the case, and where the hardware has > group-wise configuration (e.g. on R-Car). > > Hence IMHO "the future of Renesas pin control" will remain a split > personality for a while ;-) > > Laurent: please kick me if you disagree... I unfortunately agree. Maybe we could try to speed up the process by providing feedback to the hardware engineers ? -- Regards, Laurent Pinchart