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The Nintendo Wii's chipset (called "Hollywood") has a GPIO controller that supports a configurable number of pins (up to 32), interrupts, and some special mechanisms to share the controller between the system's security processor (an ARM926) and the PowerPC CPU. Pin multiplexing is not supported. This patch adds a basic driver for this GPIO controller. Interrupt support will come in a later patch. This patch is based on code developed by Albert Herranz and the GameCube Linux Team, file arch/powerpc/platforms/embedded6xx/hlwd-gpio.c, available at https://github.com/DeltaResero/GC-Wii-Linux-Kernels, but has grown quite dissimilar. v3: - Do some style cleanups, as suggest by Andy Shevchenko v2: - Change hlwd_gpio_driver.driver.name to "gpio-hlwd" to match the filename (was "hlwd_gpio") - Remove unnecessary include of linux/of_gpio.h, as suggested by Linus Walleij. - Add struct device pointer to context struct to make it possible to use dev_info(hlwd->dev, "..."), as suggested by Linus Walleij - Use the GPIO_GENERIC library to reduce code size, as suggested by Linus Walleij - Use iowrite32be instead of __raw_writel for big-endian MMIO access, as suggested by Linus Walleij - Remove commit message paragraph suggesting to diff against the original driver, because it's so different now Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Cc: Albert Herranz <albert_herranz@yahoo.es> Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.