linux-kernel - [PATCH v6 0/6] ARM: mediatek: Add support for interrupt polarity

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Date:	Thu, 13 Nov 2014 23:37:03 +0800
From:	Yingjoe Chen <yingjoe.chen@...iatek.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Marc Zyngier <marc.zyngier@....com>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Grant Likely <grant.likely@...aro.org>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yijing Wang <wangyijing@...wei.com>,
	<srv_heupstream@...iatek.com>, <yingjoe.chen@...il.com>,
	<hc.yen@...iatek.com>, <eddie.huang@...iatek.com>,
	<nathan.chung@...iatek.com>, <yh.chen@...iatek.com>,
	Sascha Hauer <kernel@...gutronix.de>
Subject: [PATCH v6 0/6] ARM: mediatek: Add support for interrupt polarity


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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