Subject: Re: [PATCH 2/2] powerpc/85xx: create 32-bit DTS for the P1022DS

From: Scott Wood <[email-masked]>
Date: Wed, 7 Dec 2011 18:08:10 -0600

On 12/07/2011 06:04 PM, Timur Tabi wrote:
> +		/*
> +		 * This node is used to access the pixis via "indirect" mode,
> +		 * which is done by writing the pixis register index to chip
> +		 * select 0 and the value to/from chip select 1.  Indirect
> +		 * mode is the only way to access the pixis when DIU video
> +		 * is enabled.  Note that this assumes that the first column
> +		 * of the 'ranges' property above is the chip select number.
> +		 */
> +		board-control@0,0 {
> +			compatible = "fsl,p1022ds-indirect-pixis";
> +			reg = <0x0 0x0 1	/* CS0 */
> +			       0x1 0x0 1>;	/* CS1 */
> +		};
[snip]
> +		board-control@3,0 {
> +			compatible = "fsl,p1022ds-fpga", "fsl,fpga-ngpixis";
> +			reg = <3 0 0x30>;
> +			interrupt-parent = <&mpic>;
> +			/*
> +			 * IRQ8 is generated if the "EVENT" switch is pressed
> +			 * and PX_CTL[EVESEL] is set to 00.
> +			 */
> +			interrupts = <8 8 0 0>;
> +		};

It's not new to this patch, but... what does "8" mean in the second cell
of an mpic interrupt specifier?  And why does the indirect pixis node
not have the interrupt?

-Scott