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From: Michael Welling <mwelling@ieee.org>
Subject: Re: [PATCH 2/2] tools/gpio: add the gpio-hammer tool
Date: Wed, 1 Jun 2016 13:09:06 -0500
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To: Linus Walleij <linus.walleij@linaro.org>
Cc: "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>, Alexandre Courbot <acourbot@nvidia.com>, Markus Pargmann <mpa@pengutronix.de>, Lee Campbell <leecam@google.com>, Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>, Grant Likely <grant.likely@linaro.org>, Arnd Bergmann <arnd@arndb.de>, Mark Brown <broonie@kernel.org>, Dmitry Torokhov <dmitry.torokhov@gmail.com>, Johan Hovold <johan@kernel.org>

On Wed, Jun 01, 2016 at 07:35:28PM +0200, Linus Walleij wrote:
> On Wed, Jun 1, 2016 at 5:43 AM, Michael Welling <mwelling@ieee.org> wrote:
> 
> > Did you ever find a solution for the exhausted char dev problem?
> 
> Not really. It seems it turned up that all systems that bugged were randomly
> generated QEMU models, not real systems.
> 
> They were also really doing far out stuff already, overwriting existing chardevs
> all over the place, which can be seen in logs after commit
> 49db08c35887 "chrdev: emit a warning when we go below dynamic major range"
> which I got merged.
>

Yeah I noticed that their config was pretty crazy.
 
> I'm now working on an event ABI so we get feature complete and also surpass
> the old sysfs.
>

Okay I will review and test it when the patch shows up.

Is there a way to name a group of GPIOs?

It seems you are passing around a byte of data for each GPIO state.
Is there a reason why the bits couldn't bit masked into single variable
given the max number of handles is 64?

> Yours,
> Linus Walleij