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

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Date:	Thu, 22 Dec 2011 11:25:22 -0500
From:	Kyle Moffett <Kyle.D.Moffett@...ing.com>
To:	linuxppc-dev@...ts.ozlabs.org
Cc:	Kyle Moffett <Kyle.D.Moffett@...ing.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	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: [PATCH] fsl/mpic: Document and use the "big-endian" device-tree flag

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>
---
 .../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 {
-- 
1.7.7.3

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