linux-kernel - Re: [RFC PATCH 1/6] DRIVERS: IRQCHIP: IRQ-GIC: Add support for routable irqs

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Message-ID: <5268FA00.1010902@ti.com>
Date:	Thu, 24 Oct 2013 16:14:16 +0530
From:	Sricharan R <r.sricharan@...com>
To:	Kumar Gala <galak@...eaurora.org>
CC:	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-doc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <tglx@...utronix.de>,
	<linus.walleij@...aro.org>, <santosh.shilimkar@...com>,
	<linux@....linux.org.uk>, <tony@...mide.com>, <rnayak@...com>,
	<marc.zyngier@....com>, <grant.likely@...aro.org>,
	<rob.herring@...xeda.com>, <mark.rutland@....com>
Subject: Re: [RFC PATCH 1/6] DRIVERS: IRQCHIP: IRQ-GIC: Add support for routable
 irqs

On Thursday 24 October 2013 03:08 PM, Kumar Gala wrote:
> On Sep 30, 2013, at 8:59 AM, Sricharan R wrote:
>
>> In some socs the gic can be preceded by a crossbar IP which
>> routes the peripheral interrupts to the gic inputs. The peripheral
>> interrupts are associated with a fixed crossbar input line and the
>> crossbar routes that to one of the free gic input line.
>>
>> The DT entries for peripherals provides the fixed crossbar input line
>> as its interrupt number and the mapping code should associate this with
>> a free gic input line. This patch adds the support inside the gic irqchip
>> to handle such routable irqs. The routable irqs are registered in a linear
>> domain. The registered routable domain's callback should be implemented
>> to get a free irq and to configure the IP to route it.
>>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: Linus Walleij <linus.walleij@...aro.org>
>> Cc: Santosh Shilimkar <santosh.shilimkar@...com>
>> Cc: Russell King <linux@....linux.org.uk>
>> Cc: Tony Lindgren <tony@...mide.com>
>> Cc: Rajendra Nayak <rnayak@...com>
>> Cc: Marc Zyngier <marc.zyngier@....com>
>> Cc: Grant Likely <grant.likely@...aro.org>
>> Cc: Rob Herring <rob.herring@...xeda.com>
>> Signed-off-by: Sricharan R <r.sricharan@...com>
>> ---
>> Documentation/devicetree/bindings/arm/gic.txt |    5 +++
>> arch/arm/boot/dts/dra7.dtsi                   |    1 +
>> drivers/irqchip/irq-gic.c                     |   57 +++++++++++++++++++++----
>> include/linux/irqchip/arm-gic.h               |    8 +++-
>> 4 files changed, 61 insertions(+), 10 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/gic.txt b/Documentation/devicetree/bindings/arm/gic.txt
>> index 3dfb0c0..2d8c680 100644
>> --- a/Documentation/devicetree/bindings/arm/gic.txt
>> +++ b/Documentation/devicetree/bindings/arm/gic.txt
>> @@ -49,6 +49,11 @@ Optional
>>   regions, used when the GIC doesn't have banked registers. The offset is
>>   cpu-offset * cpu-nr.
>>
>> +- routable-irqs	: Total number of gic irq inputs which are not directly
>> +		  connected from the peripherals, but are routed dynamically
>> +		  by a crossbar/multiplexer preceding the GIC. The GIC irq
>> +		  input line is assigned dynamically when the corresponding
>> +		  peripheral's crossbar line is mapped.
> arm,routable-irqs
 ok will change here as well.

 Thanks for reviewing.

Regards,
 Sricharan
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