linux-kernel - Re: [RFC PATCH] pinctrl: add helper to expose pinctrl state in debugfs

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Message-ID: <20201215224212.GB2086329@x1>
Date:   Tue, 15 Dec 2020 14:42:12 -0800
From:   Drew Fustini <drew@...gleboard.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Tony Lindgren <tony@...mide.com>
Subject: Re: [RFC PATCH] pinctrl: add helper to expose pinctrl state in
 debugfs

On Tue, Dec 15, 2020 at 09:39:18PM +0200, Andy Shevchenko wrote:
> On Tue, Dec 15, 2020 at 9:36 PM Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
> > On Mon, Dec 14, 2020 at 11:44 PM Drew Fustini <drew@...gleboard.org> wrote:
> > > On Mon, Dec 14, 2020 at 07:55:12PM +0200, Andy Shevchenko wrote:
> 
> ...
> 
> > > With regards to parent directory, I did discover there is
> > > debugfs_lookup(), so I can get the dentry for "pinctrl" and create new
> > > subdirectory inside of it.  This is the structure now:
> > >
> > > /sys/kernel/debug/pinctrl/pinctrl_state/ocp:P2_35_pinmux/state
> > > /sys/kernel/debug/pinctrl/pinctrl_state/ocp:P2_34_pinmux/state
> > > /sys/kernel/debug/pinctrl/pinctrl_state/ocp:P2_33_pinmux/state
> > > /sys/kernel/debug/pinctrl/pinctrl_state/ocp:P2_32_pinmux/state
> > > etc..
> 
> Missed part to comment.
> 
> I was talking about
> 
> /sys/kernel/debug/pinctrl/<$PINCTRL>/mux/<$PIN> (maybe folder, maybe node)

Thanks for the example.

What would the value be "<$PINCTRL>"?  The name of the driver?

The "ocp:Px_yy_pinmux" directory name comes from dev_name(dev). Is that
the name you were referencing in "<$PIN>"?


thanks,
drew