Hi all,
Unlike on most other Renesas SoCs, the GPIO controller block on RZ/A1
SoCs lack interrupt functionality. While the GPIOs can be routed to the
GIC as pin interrupts, this is of limited use, as the PL390 GIC supports
rising edge and high-level interrupts only.
Fortunately RZ/A1 SoCs contain a small front-end for the GIC, allowing
to use up to 8 external interrupts, with configurable sense select.
Hence this patch series adds DT bindings and a driver for this
front-end, adds a device node for it in the RZ/A1H DTS, and uses it to
enable support for the 3 input switches on the Renesas RSK+RZA1
development board.
I expect this driver to be reusable for RZ/A2, after adding a match
entry with .gic_spi_base = 4.
- Should this information come from DT instead?
- Originally I had interrupts properties in DT to define the mapping
from external interrupts to GIC interrupts (cfr. "renesas,irqc",
which also calls request_irq()), but other similar drivers seem to
hardcode this information in the driver, so I went that route.
Dependencies:
- Patch 3 depends on patch 2,
- Patch 4 can be applied as soon as the DT bindings in patch 1 have
been accepted,
- Patch 5 depends on patch 4.
This has been tested on RSK+RZA1 with evtest and s2ram wake-up.
I have verified proper operation of low-level and rising/falling sense
select, too.
Thanks for your comments!
Geert Uytterhoeven (5):
dt-bindings: interrupt-controller: Add Renesas RZ/A1 Interrupt
Controller
irqchip: Add Renesas RZ/A1 Interrupt Controller driver
soc: renesas: Enable RZ/A1 IRQC on RZ/A1H
ARM: dts: r7s72100: Add IRQC device node
ARM: dts: rskrza1: Add input switches
.../renesas,rza1-irqc.txt | 27 ++
arch/arm/boot/dts/r7s72100-rskrza1.dts | 38 +++
arch/arm/boot/dts/r7s72100.dtsi | 8 +
drivers/irqchip/Kconfig | 4 +
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-renesas-rza1.c | 238 ++++++++++++++++++
drivers/soc/renesas/Kconfig | 1 +
7 files changed, 317 insertions(+)
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/renesas,rza1-irqc.txt
create mode 100644 drivers/irqchip/irq-renesas-rza1.c
--
2.17.1
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
