linux-kernel - Re: [PATCH 2/3] ARM: dts: DRA: Add crossbar device binding

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Date:	Thu, 18 Jul 2013 14:04:38 -0500
From:	Nishanth Menon <nm@...com>
To:	Sricharan R <r.sricharan@...com>
CC:	<linux-kernel@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <tony@...mide.com>,
	<linux@....linux.org.uk>, <rnayak@...com>, <balbi@...com>
Subject: Re: [PATCH 2/3] ARM: dts: DRA: Add crossbar device binding

On 07/18/2013 11:43 AM, Sricharan R wrote:
> This adds the irq/dma crossbar device nodes.
>
> There is a IRQ and DMA crossbar device in the soc, which
> maps the irq/dma requests from the peripherals to the
> mpu/dsp/ipu/eve interrupt and sdma/edma controller's inputs.
> The Peripheral irq/dma requests are connected to only one crossbar
> input and the output of the crossbar is connected to only one
> controller's input line. On POR, there are some mappings which
> are done by default. Those peripherals which do not have a
> mapping on POR, should be configured to route its requests
> using the crossbar control registers.
>

What is POR? Plan on Record? I supppose, we just love our TLA?

> The irq/dma mapping for some peripherals are
> added with the crossbar nodes here.
>
> Signed-off-by: Sricharan R <r.sricharan@...com>
> ---
>   arch/arm/boot/dts/dra7.dtsi |   19 +++++++++++++++++++
>   1 file changed, 19 insertions(+)
>
> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
> index a5d9350..e6208b4 100644
> --- a/arch/arm/boot/dts/dra7.dtsi
> +++ b/arch/arm/boot/dts/dra7.dtsi
> @@ -85,6 +85,25 @@
>   		ranges;
>   		ti,hwmods = "l3_main_1", "l3_main_2";
>
> +		crossbar_mpu: mpuirq@...02a48 {
> +			compatible = "crossbar";
> +			crossbar-name = "mpu-irq";
> +			reg = <0x4a002a48 0x0130>;
> +			reg-width = <16>;
> +			crossbar-lines = "mpu-irq", "rtc-ss-alarm", <0x9f 0xd9 0x12c>,
> +					 "mpu-irq", "mcasp3-arevt", <0x9e 0x96 0x12a>,
> +					 "mpu-irq", "mcasp3-axevt", <0x9d 0x97 0x128>;

a) I'd like to use UART10. oh, let me guess: we dont map all cross bar 
options here.. just "certain ones"
b) I like to use random 6 uarts out of the available 10 uarts on the fly.
c) I'd like to use IRQCROSS bar such that i use all the hardware block 
instances that dont have default GIC IRQ mapping.


> +		};
> +
> +		crossbar_dma: dmareq@...02b78 {
> +			compatible = "crossbar";
> +			crossbar-name = "dma-req";
> +			reg = <0x4a002b78 0x0100>;
> +			reg-width = <16>;
> +			crossbar-lines = "dma-req", "mcasp3-rx", <0x7e 0x84 0xfc>,
> +					 "dma-req", "mcasp3-tx", <0x7d 0x85 0xfa>;
> +		};
> +
>   		counter32k: counter@...04000 {
>   			compatible = "ti,omap-counter32k";
>   			reg = <0x4ae04000 0x40>;
>


-- 
Regards,
Nishanth Menon
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