There's now a new ReST file. Add it to the index.rst file.

Fixes: ce7a2f77f976 ("docs: gpio: Add GPIO Aggregator documentation")
Fixes: 2fd1abe99e5f ("Documentation: gpio: add documentation for gpio-mockup")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Acked-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Link: https://lore.kernel.org/r/bad4d85c218d59c1bf69157df8e1012577680d88.1601616399.git.mchehab+huawei@kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

There's some documentation for gpio-mockup's debugfs interface in the
driver's source but it's not much. Add proper documentation for this
testing module.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Document the GPIO Aggregator, and the two typical use-cases.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Reviewed-by: Ulrich Hecht <uli+renesas@fpond.eu>
Reviewed-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Link: https://lore.kernel.org/r/20200511145257.22970-6-geert+renesas@glider.be
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

While this is stated as obsoleted, the sysfs interface described
there is still valid, and belongs to the admin-guide.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>