linux-kernel - Re: [PATCH RFC/RFT 1/1] misc: add simple logic analyzer using polling

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Date:   Thu, 1 Apr 2021 23:45:28 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH RFC/RFT 1/1] misc: add simple logic analyzer using polling

Hi Linus,

> I am a great supporter of this idea.

Great, thanks!

> When other debugging tools for GPIO got DT bindings it was concluded that
> it is possible to create bindings like this for debugging without even
> specifying
> any formal bindings. They are just for debugging after all.

So, I remove the yaml file and add the bindings to the documenation,
then? Makes sense to me because it is for debugging and not really
official.

> I would consider housing this tool under drivers/gpio actually.
> We have other funky things like gpio-sim and gpio-aggregator
> so why not.

Heh, my first draft was placed in drivers/gpio. I'd be happy to have it
there.

> I would create a Kconfig menu with "GPIO hardware hacking tools".
> 
> But Bartosz would need to agree on that idea.

Since he agreed, I'll update this in v2.

> > +config GPIO_LOGIC_ANALYZER
> > +       tristate "Simple GPIO logic analyzer"
> > +       depends on GPIOLIB || COMPILE_TEST
> > +       help
> 
> depends on EXPERT

Yes, good point!

All the best,

   Wolfram


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