linux-kernel - Re: [linux-sunxi] [PATCH 1/2] drivers: pinctrl: add driver for Allwinner H5 SoC

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Message-ID: <20161230194210.GE3940@atomide.com>
Date:   Fri, 30 Dec 2016 11:42:11 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     André Przywara <andre.przywara@....com>,
        Icenowy Zheng <icenowy@...c.xyz>,
        Catalin Marinas <catalin.marinas@....com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH 1/2] drivers: pinctrl: add driver for
 Allwinner H5 SoC

* Linus Walleij <linus.walleij@...aro.org> [161230 04:56]:
> On Mon, Dec 26, 2016 at 3:33 PM, André Przywara <andre.przywara@....com> wrote:
> 
> > So while this patch technically looks correct, I was wondering if we
> > should really explore the possibility of making the whole of sunxi
> > pinctrl DT controlled.
> > I brought this up a while ago, but people weren't overly enthusiastic
> > about it, though their argument weren't really convincing to me[1].
> >
> > So:
> > As this "driver" here is basically a table linking GPIO bit settings
> > (the actual mux value) to names and every pin we care about needs to be
> > enumerated in the DT anyway, why not just add something like:
> > allwinner,pinmux = <4>;
> > to each pin(group) in the DT and get rid of this "driver" file here
> > entirely?
> 
> I'm open to that if you can use pinctrl-single which is in the kernel
> for this purpose only, and is used with both OMAPs and HiSilicon.
> 
> It recently was improved and will be improved more in this cycle,
> see for example:
> commit 42124bc598f64f84b3335d5a058304207695b84f
> pinctrl: Introduce generic #pinctrl-cells and pinctrl_parse_index_with_args
> 
> > (...) Also I guess the common sunxi
> > pinctrl driver code needs some significant rework.
> 
> I would guess is just needs replacing with pinctrl-single in that case.

And if pinctrl-single won't work then it is now also be easier to make
hardware specific drivers too using #pinctrl-cells + GENERIC_PINCTRL_GROUPS +
GENERIC_PINMUX_FUNCTIONS.

Regards,

Tony