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

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Date:   Wed, 17 May 2023 09:21:36 +0800
From:   Kent Gibson <warthog618@...il.com>
To:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "brgl@...ev.pl" <brgl@...ev.pl>,
        "johan@...nel.org" <johan@...nel.org>,
        "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        "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>
Subject: Re: [PATCH] gpiolib: Avoid side effects in gpio_is_visible()

On Wed, May 17, 2023 at 01:07:25AM +0000, Chris Packham wrote:
> 
> On 17/05/23 12:47, Kent Gibson wrote:
> > On Tue, May 16, 2023 at 11:50:42PM +0000, Chris Packham wrote:
> >> Hi Kent,
> >>
> >>
> > Given appropriate line names, that is already something you can do with
> > the libgpiod v2 tools.  Something like:
> >
> > `for x in gpiochip*; do gpioset -c x tx-dis=1; done`
> Would that deal with the fact the GPIO lines are port1-tx-dis, 
> port2-tx-dis, ... port96-tx-dis?

That is assuming the lines are all given the same name - "tx-dis".

If the line names are all distinct, and you can generate the list, then
you could provide that list to gpioset instead.
e.g.
`gpioset port1-tx-dis=1 port2-tx-dis=1 ....`

and it will work out which lines are on which chips.

Cheers,
Kent.