[PATCH v2 0/4] Add bcm2835aux interrupt controller
phil at raspberrypi.org
Mon Jun 12 07:25:02 PDT 2017
Devices in the BCM2835 AUX block share a common interrupt line, with a
register indicating which devices have active IRQs. Expose this as a
nested interrupt controller to avoid IRQ sharing problems (easily
observed if UART1 and SPI1/2 are enabled simultaneously).
This patch set is complicated by the fact that the DT node for the AUX
clock controller includes the AUXIRQ register needed by this driver.
Patch 1 lays the groundwork by allowing this overlap and preparing for
a future DT change that removes it.
Changes in v2:
* Add DT bindings and header file for bcm2835-aux-intc.
* Split the interrupt-controller functionality into a dedicated irqchip
driver with a dedicated DT node.
* Remove mask tracking from the intc driver, so that all interrupts
(including spurious ones) are submitted to the IRQ framework.
* Replace hard-coded masks with BIT macro in the intc driver.
* Prepare the AUX clock driver for a time when its DT node may only be
a single word register, but until then ioremap its region without
reserving it to permit sharing.
Phil Elwell (4):
clk: bcm2835: More flexible IO register remapping
dt: bindings: Add bindings for bcm2835-aux-intc
irqchip: Add BCM2835 AUX interrupt controller
ARM: dts: bcm283x: Add and use bcm2835-aux-intc
.../interrupt-controller/brcm,bcm2835-aux-intc.txt | 28 ++++
arch/arm/boot/dts/bcm283x.dtsi | 27 +++-
drivers/clk/bcm/clk-bcm2835-aux.c | 20 ++-
drivers/irqchip/Makefile | 2 +-
drivers/irqchip/irq-bcm2835-aux.c | 155 +++++++++++++++++++++
.../interrupt-controller/bcm2835-aux-intc.h | 20 +++
6 files changed, 243 insertions(+), 9 deletions(-)
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2835-aux-intc.txt
create mode 100644 drivers/irqchip/irq-bcm2835-aux.c
create mode 100644 include/dt-bindings/interrupt-controller/bcm2835-aux-intc.h
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