[PATCH v2 12/17] dm: irq: Add support for requesting interrupts

[Bin Meng]

On Tue, Feb 4, 2020 at 8:20 AM Simon Glass <sjg at chromium.org> wrote:
>
> At present driver model supports the IRQ uclass but there is no way to
> request a particular interrupt for a driver.
>
> Add a mechanism, similar to clock and reset, to read the interrupts
> required by a device from the device tree and to request those interrupts.
>
> U-Boot itself does not have interrupt-driven handlers, so just provide a
> means to read and clear an interrupt. This can be useful to handle
> peripherals which must use an interrupt to determine when data is
> available, for example.
>
> Bring over the basic binding file as well, from Linux v5.4. Note that the
> older binding is not supported in U-Boot; the newer 'special form' must be
> used.
>
> Add a simple test of the new functionality.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
>
> Changes in v2: None
>
>  arch/sandbox/dts/test.dts                     |   5 +-
>  .../interrupt-controller/interrupts.txt       | 131 ++++++++++++++++++
>  drivers/misc/irq-uclass.c                     | 116 ++++++++++++++++
>  drivers/misc/irq_sandbox.c                    |  41 ++++++
>  include/irq.h                                 | 115 +++++++++++++++
>  test/dm/irq.c                                 |  31 +++++
>  6 files changed, 438 insertions(+), 1 deletion(-)
>  create mode 100644 doc/device-tree-bindings/interrupt-controller/interrupts.txt
>

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>