linux-kernel - Re: [PATCH v4 0/7] ARM: mediatek: Add support for interrupt polarity

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Date:	Fri, 24 Oct 2014 16:59:44 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Yingjoe Chen <yingjoe.chen@...iatek.com>
Cc:	Rob Herring <robh+dt@...nel.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Marc Zyngier <marc.zyngier@....com>, arm@...nel.org,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Grant Likely <grant.likely@...aro.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	Yingjoe Chen <yingjoe.chen@...il.com>,
	Hsien-Chun Yen <hc.yen@...iatek.com>,
	huang eddie <eddie.huang@...iatek.com>,
	Nathan Chung <nathan.chung@...iatek.com>,
	Yuhau Chen <yh.chen@...iatek.com>
Subject: Re: [PATCH v4 0/7] ARM: mediatek: Add support for interrupt polarity

Hi Joe,

2014-10-23 17:53 GMT+02:00 Yingjoe Chen <yingjoe.chen@...iatek.com>:
> This series is 4th version of interrupt polarity support for MediaTek SoCs.
> This is based on Jiang's hierarchy irqdomain v2 [1] and my mediatek SoC
> basic support [2].
>
> This version addressed comments from previous discussion[3]. I removed
> arm,hierarchy-irq-domain property. When GIC is probed by DT, it will
> support hierarchy irqdomain. I still keep the first patch because this is
> still base on hierarchy irqdomain v2.

Is this set based on v3.17-rc1?
Is it based on one of Jiangs trees [0]?

I tried to use your patch set with v3.18-rc1 using Jiangs tree but the
kernel crashed on mt6589 with a null-pointer exception [1]. A test
with mt6592 didn't work either.

It would be convenient if you rebase your patches to v3.18-rc1.

Thanks,
Matthias

[0] https://github.com/jiangliu/linux
[1] http://pastebin.com/3F1pVaM9

>
> In Jiang's version of irq_create_of_mapping, if irqdomain is hierarchy, it
> will not perform irq_find_mapping check and set_type. The outermost
> irqdomain need to take care of that. Because we will have several different
> outermost irqdomain in different ARM SoCs, this cause code duplication. I
> moved them back to irq_create_of_mapping. Since Jiang's changes are not
> merged yet, maybe that patch should be merged there.
>
> 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:       1862  MT_SYSIRQ 113  mtk_timer
>  17:         67  MT_SYSIRQ  54  mtk-uart
>
> Changes in v3:
>  - Discussion in [3]
>  - First implementation using hierarchy irqdomain
>
> [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-September/290832.html
> [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-September/284553.html
> [3] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-October/293766.html
>
> Yingjoe Chen (7):
>   irqdomain: Fix irq_domain_alloc_irqs return check.
>   irqdomain: Add back xlate and set_type for hierarchy irq domain
>   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                          |  54 +++++--
>  drivers/irqchip/irq-mtk-sysirq.c                   | 168 +++++++++++++++++++++
>  include/linux/irq.h                                |   6 +
>  kernel/irq/chip.c                                  |  28 ++++
>  kernel/irq/irqdomain.c                             |  31 ++--
>  11 files changed, 332 insertions(+), 25 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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