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The syscon node defines a register range that duplicates that used by the local_intc node on bcm2836/7. Since irq-bcm2835 and irq-bcm2836 are built in and always present together (both drivers are enabled by CONFIG_ARCH_BCM2835), it is possible to replace the syscon usage with a global variable that simplifies the code. Doing so does lose the locking provided by regmap, but as only one side is using the regmap interface (irq-bcm2835 uses readl and write) there is no loss of atomicity. See: https://github.com/raspberrypi/firmware/issues/926 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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.
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