linux-kernel - Re: [PATCH V4 13/16] irqchip: crossbar: Introduce ti,max-crossbar-sources to identify valid crossbar mapping

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Message-ID: <20140627120035.GB23978@titan.lakedaemon.net>
Date:	Fri, 27 Jun 2014 08:00:35 -0400
From:	Jason Cooper <jason@...edaemon.net>
To:	Sricharan R <r.sricharan@...com>
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 V4 13/16] irqchip: crossbar: Introduce
 ti,max-crossbar-sources to identify valid crossbar mapping

On Thu, Jun 26, 2014 at 12:40:31PM +0530, Sricharan R wrote:
> From: Nishanth Menon <nm@...com>
> 
> Currently we attempt to map any crossbar value to an IRQ, however,
> this is not correct from hardware perspective. There is a max crossbar
> event number upto which hardware supports. So describe the same in
> device tree using 'ti,max-crossbar-sources' property and use it to
> validate requests.
> 
> Signed-off-by: Nishanth Menon <nm@...com>
> Signed-off-by: Sricharan R <r.sricharan@...com>
> Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
> ---
>  .../devicetree/bindings/arm/omap/crossbar.txt      |    2 ++
>  drivers/irqchip/irq-crossbar.c                     |   21 ++++++++++++++++++--
>  2 files changed, 21 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/arm/omap/crossbar.txt b/Documentation/devicetree/bindings/arm/omap/crossbar.txt
> index 5f45c78..6923531 100644
> --- a/Documentation/devicetree/bindings/arm/omap/crossbar.txt
> +++ b/Documentation/devicetree/bindings/arm/omap/crossbar.txt
> @@ -10,6 +10,7 @@ Required properties:
>  - compatible : Should be "ti,irq-crossbar"
>  - reg: Base address and the size of the crossbar registers.
>  - ti,max-irqs: Total number of irqs available at the interrupt controller.
> +- ti,max-crossbar-sources: Maximum number of crossbar sources that can be routed.
>  - ti,reg-size: Size of a individual register in bytes. Every individual
>  	    register is assumed to be of same size. Valid sizes are 1, 2, 4.
>  - ti,irqs-reserved: List of the reserved irq lines that are not muxed using
> @@ -30,6 +31,7 @@ Examples:
>  			compatible = "ti,irq-crossbar";
>  			reg = <0x4a002a48 0x130>;
>  			ti,max-irqs = <160>;
> +			ti,max-crossbar-sources = <MAX_SOURCES>;

As mentioned in my reply to #15, I can change this to 400 when I apply
it, or you can send a new version of #15 using the macro and explaining
it's definition.

Thinking about it more, it's probably best just to use numbers in the
docs.

thx,

Jason.
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