linux-kernel - [PATCH 3.12 099/133] i2c: mv64xxx: Document the newly introduced Armada XP A0 compatible

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Message-Id: <20140204210739.834494126@linuxfoundation.org>
Date:	Tue,  4 Feb 2014 13:08:20 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Arnd Bergmann <arnd@...db.de>, devicetree@...r.kernel.org,
	Jason Cooper <jason@...edaemon.net>
Subject: [PATCH 3.12 099/133] i2c: mv64xxx: Document the newly introduced Armada XP A0 compatible

3.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gregory CLEMENT <gregory.clement@...e-electrons.com>

commit f8b94beb7e6a374cb0de531b72377c49857b35ca upstream.

The first variants of Armada XP SoCs (A0 stepping) have issues related
to the i2c controller which prevent to use the offload mechanism and
lead to a kernel hang during boot.

The commit introduces a new the compatible string
marvell,mv78230-a0-i2c for the i2c controller.

Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
Acked-by: Arnd Bergmann <arnd@...db.de>
cc: devicetree@...r.kernel.org
Fixes: 930ab3d403ae (i2c: mv64xxx: Add I2C Transaction Generator support)
Signed-off-by: Jason Cooper <jason@...edaemon.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
@@ -5,7 +5,11 @@ Required properties :
 
  - reg             : Offset and length of the register set for the device
  - compatible      : Should be "marvell,mv64xxx-i2c" or "allwinner,sun4i-i2c"
-                     or "marvell,mv78230-i2c"
+                     or "marvell,mv78230-i2c" or "marvell,mv78230-a0-i2c"
+                     Note: Only use "marvell,mv78230-a0-i2c" for a very rare,
+                     initial version of the SoC which had broken offload
+                     support.  Linux auto-detects this and sets it
+                     appropriately.
  - interrupts      : The interrupt number
 
 Optional properties :


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