linux-kernel - [PATCH 3.13 080/212] ARM: mvebu: fix NOR bus-width in Armada XP DB Device Tree

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Date:	Tue, 17 Jun 2014 14:42:54 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 080/212] ARM: mvebu: fix NOR bus-width in Armada XP DB Device Tree

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

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

From: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>

commit f3aec8f3f05025e7b450102dae0759375346706e upstream.

The mvebu-devbus driver had a serious bug, which lead to a 8 bits bus
width declared in the Device Tree being considered as a 16 bits bus
width when configuring the hardware.

This bug in mvebu-devbus driver was compensated by a symetric mistake
in the Armada XP DB Device Tree: a 8 bits bus width was declared, even
though the hardware actually has a 16 bits bus width connection with
the NOR flash.

Now that we have fixed the mvebu-devbus driver to behave according to
its Device Tree binding, this commit fixes the problematic Device Tree
files as well.

This bug was introduced in commit
b484ff42df475c5087d614c4d477273e1906bcb9 ('ARM: mvebu: Add support for
NOR flash device on Armada XP-DB board') which was merged in v3.11.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Link: https://lkml.kernel.org/r/1397489361-5833-4-git-send-email-thomas.petazzoni@free-electrons.com
Fixes: b484ff42df47 ('ARM: mvebu: Add support for NOR flash device on Armada XP-DB board')
Acked-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Acked-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
Signed-off-by: Jason Cooper <jason@...edaemon.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/arm/boot/dts/armada-xp-db.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/armada-xp-db.dts b/arch/arm/boot/dts/armada-xp-db.dts
index bcf6d79..8c2fe44 100644
--- a/arch/arm/boot/dts/armada-xp-db.dts
+++ b/arch/arm/boot/dts/armada-xp-db.dts
@@ -40,7 +40,7 @@
 			/* Device Bus parameters are required */

 			/* Read parameters */
-			devbus,bus-width    = <8>;
+			devbus,bus-width    = <16>;
 			devbus,turn-off-ps  = <60000>;
 			devbus,badr-skew-ps = <0>;
 			devbus,acc-first-ps = <124000>;
-- 
1.9.1

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