linux-kernel - Re: [PATCH V3 03/16] irqchip: crossbar: introduce ti,irqs-skip to skip

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Message-ID: <53A7D541.6090009@ti.com>
Date:	Mon, 23 Jun 2014 12:50:33 +0530
From:	Sricharan R <r.sricharan@...com>
To:	Jason Cooper <jason@...edaemon.net>
CC:	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<tony@...mide.com>, <santosh.shilimkar@...com>, <nm@...com>,
	<rnayak@...com>, <linux@....linux.org.uk>, <tglx@...utronix.de>,
	<joe@...ches.com>
Subject: Re: [PATCH V3 03/16] irqchip: crossbar: introduce ti,irqs-skip to
 skip

On Saturday 21 June 2014 08:03 AM, Jason Cooper wrote:
> Sricharan,
> 
> Your subject line seems truncated:
> 
>   "irqchip: crossbar: introduce ti,irqs-skip to skip"
> 
> maybe "... Introduce DT property to skip hardwired irqs" ?
> 
> Also note that you need to correct the subject line for *every* patch in
> the series wrt capitalization.
> 
> I don't mind correcting it when I apply it, provided that:
> 
ha, i think this got truncated unintentionally. Sorry will fix this.
>  - the patch is otherwise ready
>  - I only have to do it once or twice for the series
>  - I never had a chance to ask since you created a rockstar patch series
>    the first time out of the gate (except for capitalization).
> 
> Once I've looked over the whole series, please resend with the subject
> lines corrected.
> 
Ok. I will look for your comments on the rest of the patches and
resend with capitalization fix said above.

> On Mon, Jun 16, 2014 at 04:53:03PM +0530, Sricharan R wrote:
>> From: Nishanth Menon <nm@...com>
>>
>> When, in the system due to varied reasons, interrupts might be unusable
>> due to hardware behavior, but register maps do exist, then those interrupts
>> should be skipped while mapping irq to crossbars.
>>
>> Signed-off-by: Nishanth Menon <nm@...com>
>> Signed-off-by: Sricharan R <r.sricharan@...com>
>> ---
>> [V3] introduced ti,irqs-skip dt property to list the
>>      irqs to be skipped.
>>
>>  .../devicetree/bindings/arm/omap/crossbar.txt      |    4 ++++
>>  drivers/irqchip/irq-crossbar.c                     |   20 ++++++++++++++++++++
>>  2 files changed, 24 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/omap/crossbar.txt b/Documentation/devicetree/bindings/arm/omap/crossbar.txt
>> index fb88585..cfcbd52 100644
>> --- a/Documentation/devicetree/bindings/arm/omap/crossbar.txt
>> +++ b/Documentation/devicetree/bindings/arm/omap/crossbar.txt
>> @@ -17,6 +17,10 @@ Required properties:
>>  		 so crossbar bar driver should not consider them as free
>>  		 lines.
>>  
>> +Optional properties:
>> +- ti,irqs-skip: This is similar to "ti,irqs-reserved", but are irq mappings
>> +  which are not supposed to be used for errata or other reasons(virtualization).
> 
> I would specifically mention SoC-specific hard-wiring of irqs here.
> Also the fact that the hardwiring unexpectedly bypasses the crossbar.
ok, that will be more easily understandable and will add that.
> 
>> +
>>  Examples:
>>  		crossbar_mpu: @4a020000 {
>>  			compatible = "ti,irq-crossbar";
> 
> Please include a ti,irqs-skip example here.
> 
ok.
>> diff --git a/drivers/irqchip/irq-crossbar.c b/drivers/irqchip/irq-crossbar.c
>> index 51d4b87..27049de 100644
>> --- a/drivers/irqchip/irq-crossbar.c
>> +++ b/drivers/irqchip/irq-crossbar.c
>> @@ -18,6 +18,7 @@
>>  
>>  #define IRQ_FREE	-1
>>  #define IRQ_RESERVED	-2
>> +#define IRQ_SKIP	-3
>>  #define GIC_IRQ_START	32
>>  
>>  /*
>> @@ -160,6 +161,25 @@ static int __init crossbar_of_init(struct device_node *node)
>>  		}
>>  	}
>>  
>> +	/* Skip the ones marked as skip */
> 
> This comment is redundant, perhaps "Skip irqs hardwired to bypass the
> crossbar."?
ok, will change this.

Regards,
 Sricharan
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