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e8b2a61875
If CONFIG_GPIOLIB is not enabled, mctrl_gpio_init() and mctrl_gpio_init_noauto() will currently return an error pointer with -ENOSYS. As the mctrl GPIOs are usually optional, drivers need to check for this condition to allow continue probing. To avoid the need for this check in each driver, we return NULL instead, as all the mctrl_gpio_*() functions are skipped anyway. We also adapt mctrl_gpio_to_gpiod() to be in line with this change. Reviewed-by: Fabio Estevam <festevam@gmail.com> Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de> Reviewed-by: Uwe Kleine-Knig <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20190802100349.8659-1-frieder.schrempf@kontron.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.