This series is 6th version of interrupt polarity support for MediaTek SoCs.
This is based on tip/irq/irqdomain[1] and my mediatek SoC basic support[2].
In this version, I added a minor fix to irqdomain as first patch. Patch 3,
4 are changed to use newly added helper functions. The other patches are
unchanged.
Simplified block diagram for interrupt on my system:
+-------+ +-------+
---| SYSIRQ|------|ARM GIC|
---| |------| |
---| |------| |
---| |------| |
---| |------| |
+-------+ +-------+
In device tree, interrupt-parent for other devices is sysirq, child of gic.
This describe HW better and allow device to specify polarity as it is sent
by the device.
When using hierarchy irq domain, gic will use irq_domain_add_linear to
create irqdomain and all interrupt numbers must come from device tree. My
/proc/interrupts looks like this now:
# cat /proc/interrupts
CPU0
16: 149578 MT_SYSIRQ 113 mtk_timer
20: 1082 MT_SYSIRQ 54 serial
Changes in v6:
- Rebased to tip/irq/irqdomain [1]
Changes in v5:
- Discussed in [3]
- Fix bug on mt6589 reported by Matthias
- Fix bug for irq_find_mapping in irq_create_of_mapping
- Merge Marc's change to proper handle non-DT case in gic_init_bases
Changes in v4:
- Discussed in [4]
- Remove arm,hierarchy-irq-domain. When GIC is probed by DT, it will
support hierarchy irqdomain.
Changes in v3:
- Discussed in [5]
- First implementation using hierarchy irqdomain
[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/297624.html
[2] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/296093.html
[3] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/298161.html
[4] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/296911.html
[5] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/293766.html
Yingjoe Chen (6):
irqdomain: Use consistent prototype for irq_domain_free_irqs_*
genirq: Add more helper functions to support stacked irq_chip
irqchip: gic: Support hierarchy irq domain.
ARM: mediatek: Add sysirq interrupt polarity support
ARM: mediatek: Add sysirq in mt6589/mt8135/mt8127 dtsi
dt-bindings: add bindings for mediatek sysirq
.../bindings/arm/mediatek/mediatek,sysirq.txt | 26 ++++
arch/arm/boot/dts/mt6589.dtsi | 14 +-
arch/arm/boot/dts/mt8127.dtsi | 14 +-
arch/arm/boot/dts/mt8135.dtsi | 14 +-
drivers/irqchip/Kconfig | 1 +
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-gic.c | 80 +++++++----
drivers/irqchip/irq-mtk-sysirq.c | 156 +++++++++++++++++++++
include/linux/irq.h | 6 +
include/linux/irqdomain.h | 8 +-
kernel/irq/chip.c | 28 ++++
kernel/irq/irqdomain.c | 8 +-
12 files changed, 317 insertions(+), 39 deletions(-)
create mode 100644 Documentation/devicetree/bindings/arm/mediatek/mediatek,sysirq.txt
create mode 100644 drivers/irqchip/irq-mtk-sysirq.c
--
1.8.1.1.dirty
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