mainlining shenanigans
ad6b47cdef
The R_INTC in the A31 and newer sun8i/sun50i SoCs has additional functionality compared to the sun7i/sun9i NMI controller. Among other things, it multiplexes access to up to 128 interrupts corresponding to (and in parallel to) the first 128 GIC SPIs. This means the NMI is no longer the lowest-numbered hwirq at this irqchip, since it is SPI 32 or 96 (depending on SoC). hwirq 0 now corresponds to SPI 0, usually UART0. To allow access to all multiplexed IRQs, the R_INTC requires a new binding where the interrupt number matches the GIC interrupt number. Otherwise, interrupts with hwirq numbers below the NMI would not be representable in the device tree. For simplicity, copy the three-cell GIC binding; this disambiguates interrupt 0 in the old binding (the NMI) from interrupt 0 in the new binding (SPI 0) by the number of cells. Because the H6 R_INTC has a different mapping from multiplexed IRQs to top-level register bits, it is no longer compatible with the A31 R_INTC. Acked-by: Maxime Ripard <mripard@kernel.org> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Samuel Holland <samuel@sholland.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210118055040.21910-2-samuel@sholland.org |
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| .clang-format | ||
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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.