linux-kernel - pinctrl: -EAGAIN not supported but documented

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Message-ID: <94b9acab-a739-a014-b068-768f40de38ec@linux.intel.com>
Date:   Mon, 21 Jan 2019 15:28:50 +0200
From:   Ramon Fried <ramon.fried@...ux.intel.com>
To:     linus.walleij@...aro.org, bgolaszewski@...libre.com
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: pinctrl: -EAGAIN not supported but documented

Hi Linus,

Stated in Documentation/driver-api/pinctl.rst:

Since some controllers have special logic for handling entire groups of pins
they can exploit the special whole-group pin control function. The
pin_config_group_set() callback is allowed to return the error code -EAGAIN,
for groups it does not want to handle, or if it just wants to do some
group-level handling and then fall through to iterate over all pins, in 
which
case each individual pin will be treated by separate pin_config_set() 
calls as
well.

----

This is not supported, and there's no code for handling it.

Should we add the necessary code or just remove the wrong documentation.

Thanks,

Ramon