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Subject: Re: [PATCH v9 2/4] pinctrl: pinmux: Add pinmux-select debugfs file
To:     Drew Fustini <drew@beagleboard.org>,
        Linus Walleij <linus.walleij@linaro.org>,
        linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
        Tony Lindgren <tony@atomide.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
        Jason Kridner <jkridner@beagleboard.org>,
        Robert Nelson <robertcnelson@beagleboard.org>,
        Joe Perches <joe@perches.com>,
        Dan Carpenter <dan.carpenter@oracle.com>,
        Jonathan Corbet <corbet@lwn.net>, linux-doc@vger.kernel.org
Cc:     Geert Uytterhoeven <geert+renesas@glider.be>
References: <20210302053059.1049035-1-drew@beagleboard.org>
 <20210302053059.1049035-3-drew@beagleboard.org>
From:   "Enrico Weigelt, metux IT consult" <lkml@metux.net>
Message-ID: <349b09f8-fe99-d0d4-dd11-c288bf66cb4d@metux.net>
Date:   Fri, 12 Mar 2021 14:57:54 +0100
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On 02.03.21 06:30, Drew Fustini wrote:

Hi folks,

> Add "pinmux-select" to debugfs which will activate a pin function for a
> given pin group:
> 
>    echo "<group-name function-name>" > pinmux-select
> 
> The write operation pinmux_select() handles this by checking that the
> names map to valid selectors and then calling ops->set_mux().

I've already been playing with similar idea, but for external muxes.
For example, some boards have multiple SIM slots that can be switched
via some gpio pin.

Not sure whether traditional pinmux would be a good match for that.


--mtx

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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@metux.net -- +49-151-27565287