linux-kernel - Re: [PATCH 0/3] pinctrl: single: support #pinctrl-cells = 2

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Message-ID: <20200622164804.GN37466@atomide.com>
Date:   Mon, 22 Jun 2020 09:48:04 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Drew Fustini <drew@...gleboard.org>
Cc:     Rob Herring <robh+dt@...nel.org>, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Haojian Zhuang <haojian.zhuang@...aro.org>,
        devicetree@...r.kernel.org,
        Benoît Cousson <bcousson@...libre.com>,
        Jason Kridner <jkridner@...gleboard.org>,
        Robert Nelson <robertcnelson@...il.com>
Subject: Re: [PATCH 0/3] pinctrl: single: support #pinctrl-cells = 2

* Drew Fustini <drew@...gleboard.org> [200622 16:47]:
> On Mon, Jun 22, 2020 at 09:11:32AM -0700, Tony Lindgren wrote:
> > * Drew Fustini <drew@...gleboard.org> [200618 05:52]:
> > > Currently, pinctrl-single only allows #pinctrl-cells = 1.
> > > 
> > > This series will allow pinctrl-single to also support #pinctrl-cells = 2
> > > 
> > > If "pinctrl-single,pins" has 3 arguments (offset, conf, mux) then
> > > pcs_parse_one_pinctrl_entry() does an OR operation on to get the
> > > value to store in the register.
> > >     
> > > To take advantage of #pinctrl-cells = 2, the AM33XX_PADCONF macro in
> > > omap.h is modified to keep pin conf and pin mux values separate.
> > 
> > Hmm to me it looks like the order of the patches is the
> > wrong way around here. Don't we need to first change
> > pinctrl-single.c, and then only after that update the
> > dts? And make sure the pinctrl-single.c change does not
> > break anything without changing the dts :)
> > 
> > Regards,
> > 
> > Tony
> 
> Thanks for pointing this out.
> 
> I'll submit new version where:
> [PATCH 1/3] pinctrl: single: parse #pinctrl-cells = 2
> [PATCH 2/3] ARM: dts: change AM33XX_PADCONF macro separate conf and mux
> [PATCH 3/3] ARM: dts: am33xx-l4: change #pinctrl-cells from 1 to 2

OK thanks. Otherwise sounds like git bisect will break for booting.

Regards,

Tony