linux-kernel - Re: [PATCH] gpiolib: Avoid side effects in gpio_is

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Message-ID: <8f05a48c-37dc-457c-a9f8-8c7428ceba9b@lunn.ch>
Date:   Mon, 29 May 2023 17:07:02 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Kent Gibson <warthog618@...il.com>,
        "brgl@...ev.pl" <brgl@...ev.pl>,
        "johan@...nel.org" <johan@...nel.org>,
        "maz@...nel.org" <maz@...nel.org>,
        Ben Brown <Ben.Brown@...iedtelesis.co.nz>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCH] gpiolib: Avoid side effects in gpio_is_visible()

On Mon, May 29, 2023 at 11:19:02AM +0200, Linus Walleij wrote:
> On Wed, May 17, 2023 at 11:30 PM Chris Packham
> <Chris.Packham@...iedtelesis.co.nz> wrote:
> 
> > > Why does the MCU have no in-kernel driver?
> >
> > There isn't any PoE PSE infrastructure in the kernel. I'm not really
> > sure what it'd look like either as the hardware designs are all highly
> > customized and often have very specialized requirements. Even the vendor
> > reference boards tend to use the i2c userspace interface and punt
> > everything to a specialist application.
> >
> > Of course if anyone is thinking about adding PoE PSE support in-kernel
> > I'd be very keen to be involved.

There is net/ethtool/pse-pd.c.

      Andrew