linux-kernel - Re: [PATCH] fsl/mpic: Document and use the "big-endian" device-tree flag

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Date:	Wed, 04 Jan 2012 15:22:56 -0800
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Kyle Moffett <Kyle.D.Moffett@...ing.com>
CC:	linuxppc-dev@...ts.ozlabs.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Kumar Gala <galak@...nel.crashing.org>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Stuart Yoder <stuart.yoder@...escale.com>,
	Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fsl/mpic: Document and use the "big-endian" device-tree
 flag

On 12/22/2011 08:25 AM, Kyle Moffett wrote:
> The MPIC code checks for a "big-endian" property and sets the flag
> MPIC_BIG_ENDIAN if one is present.  Unfortunately, the PowerQUICC-III
> compatible device-tree does not specify it, so all of the board ports
> need to manually set that flag when calling mpic_alloc().
> 
> Document the flag and add it to the pq3 device tree.  Existing code
> will still need to pass the MPIC_BIG_ENDIAN flag because their dtb may
> not have this property, but new platforms shouldn't need to do so.
> 
> Signed-off-by: Kyle Moffett <Kyle.D.Moffett@...ing.com>

Grant, are you merging this patch?
I don't think I should merge the patch to arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi.

> ---
>  .../devicetree/bindings/powerpc/fsl/mpic.txt       |    9 ++++++++-
>  arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi            |    1 +
>  2 files changed, 9 insertions(+), 1 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/powerpc/fsl/mpic.txt b/Documentation/devicetree/bindings/powerpc/fsl/mpic.txt
> index 2cf38bd..ebafba2 100644
> --- a/Documentation/devicetree/bindings/powerpc/fsl/mpic.txt
> +++ b/Documentation/devicetree/bindings/powerpc/fsl/mpic.txt
> @@ -56,7 +56,14 @@ PROPERTIES
>            to the client.  The presence of this property also mandates
>            that any initialization related to interrupt sources shall
>            be limited to sources explicitly referenced in the device tree.
> -       
> +
> +  - big-endian
> +      Usage: optional
> +      Value type: <empty>
> +          If present the MPIC will be assumed to be big-endian.  Some
> +          device-trees omit this property on MPIC nodes even when the MPIC is
> +          in fact big-endian, so certain boards override this property.
> +
>  INTERRUPT SPECIFIER DEFINITION
>  
>    Interrupt specifiers consists of 4 cells encoded as
> diff --git a/arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi b/arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi
> index 5c80460..47f2b67 100644
> --- a/arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi
> +++ b/arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi
> @@ -39,6 +39,7 @@ mpic: pic@...00 {
>  	reg = <0x40000 0x40000>;
>  	compatible = "fsl,mpic";
>  	device_type = "open-pic";
> +	big-endian;
>  };
>  
>  timer@...00 {


-- 
~Randy
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