From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joe.C Subject: [PATCH v3 0/7] ARM: mediatek: Add support for interrupt polarity Date: Thu, 9 Oct 2014 22:29:33 +0800 Message-ID: <1412864980-20273-1-git-send-email-yingjoe.chen@mediatek.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: arm@kernel.org, Rob Herring , Thomas Gleixner , Jiang Liu , Marc Zyngier , Mark Rutland Cc: Benjamin Herrenschmidt , Sricharan R , Florian Fainelli , Russell King , yingjoe.chen@gmail.com, yh.chen@mediatek.com, nathan.chung@mediatek.com, Grant Likely , Arnd Bergmann , devicetree@vger.kernel.org, Jason Cooper , Pawel Moll , Matt Porter , Marc Carino , Matthias Brugger , eddie.huang@mediatek.com, linux-arm-kernel@lists.infradead.org, srv_heupstream@mediatek.com, hc.yen@mediatek.com, linux-kernel@vger.kernel.org, Santosh Shilimkar , Sascha Hauer , Olof Johansson List-Id: devicetree@vger.kernel.org This series is 3rd version of interrupt polarity support for MediaTek SoCs. Unlike previous attempts[1], this version is implemented with hierarchy irqdomain. This is based on Jiang's hierarchy irqdomain v2 [2] and my mediatek SoC basic support [3]. Simplified block diagram for interrupt: +-------+ +-------+ ---| 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. In order to use hierarchy irq domain, gic can't use legacy irq domain anymore. When arm,hierarchy-irq-domain property is specified, GIC will work in hierarchy way and all interrupt numbers must be set by device tree. My /proc/interrupts looks like this: # cat /proc/interrupts CPU0 16: 1862 MT_SYSIRQ 113 mtk_timer 17: 67 MT_SYSIRQ 54 mtk-uart [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-August/279052.html [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-September/290832.html [3] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-September/284553.html Joe.C (7): irqdomain: Fix irq_domain_alloc_irqs return check. 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 irq domain parent binding dt-bindings: add bindings for mediatek sysirq Documentation/devicetree/bindings/arm/gic.txt | 2 + .../bindings/arm/mediatek/mediatek,sysirq.txt | 19 +++ arch/arm/boot/dts/mt6589.dtsi | 14 +- arch/arm/boot/dts/mt8127.dtsi | 14 +- arch/arm/boot/dts/mt8135.dtsi | 14 +- arch/arm/mach-mediatek/Kconfig | 1 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-gic.c | 56 ++++++- drivers/irqchip/irq-mt65xx-sysirq.c | 170 +++++++++++++++++++++ include/linux/irq.h | 5 + kernel/irq/chip.c | 28 ++++ kernel/irq/irqdomain.c | 2 +- 12 files changed, 311 insertions(+), 15 deletions(-) create mode 100644 Documentation/devicetree/bindings/arm/mediatek/mediatek,sysirq.txt create mode 100644 drivers/irqchip/irq-mt65xx-sysirq.c