This is a note to let you know that I've just added the patch titled
ARM: mvebu: Add quirk for i2c for the OpenBlocks AX3-4 board
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-mvebu-add-quirk-for-i2c-for-the-openblocks-ax3-4-board.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 85e618a1be2b2092318178d1d66bdad49cbbeeeb Mon Sep 17 00:00:00 2001
From: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
Date: Tue, 7 Jan 2014 16:26:01 +0100
Subject: ARM: mvebu: Add quirk for i2c for the OpenBlocks AX3-4 board
From: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
commit 85e618a1be2b2092318178d1d66bdad49cbbeeeb 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.
This commit add quirk in the mvebu platform code to check the SoC
version and then update the compatible string for the i2c controller
according to the revision of the SoC. Currently only some OpenBlocks
AX3-4 boards are known to use an A0 revision so the check is done only
for these boards.
Signed-off-by: Gregory CLEMENT <gregory.clement@xxxxxxxxxxxxxxxxxx>
Fixes: 930ab3d403ae (i2c: mv64xxx: Add I2C Transaction Generator support)
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Jason Cooper <jason@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/mach-mvebu/armada-370-xp.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
--- a/arch/arm/mach-mvebu/armada-370-xp.c
+++ b/arch/arm/mach-mvebu/armada-370-xp.c
@@ -21,6 +21,7 @@
#include <linux/clocksource.h>
#include <linux/dma-mapping.h>
#include <linux/mbus.h>
+#include <linux/slab.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
@@ -28,6 +29,7 @@
#include "armada-370-xp.h"
#include "common.h"
#include "coherency.h"
+#include "mvebu-soc-id.h"
static void __init armada_370_xp_map_io(void)
{
@@ -45,8 +47,38 @@ static void __init armada_370_xp_timer_a
#endif
}
+static void __init i2c_quirk(void)
+{
+ struct device_node *np;
+ u32 dev, rev;
+
+ /*
+ * Only revisons more recent than A0 support the offload
+ * mechanism. We can exit only if we are sure that we can
+ * get the SoC revision and it is more recent than A0.
+ */
+ if (mvebu_get_soc_id(&rev, &dev) == 0 && dev > MV78XX0_A0_REV)
+ return;
+
+ for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") {
+ struct property *new_compat;
+
+ new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
+
+ new_compat->name = kstrdup("compatible", GFP_KERNEL);
+ new_compat->length = sizeof("marvell,mv78230-a0-i2c");
+ new_compat->value = kstrdup("marvell,mv78230-a0-i2c",
+ GFP_KERNEL);
+
+ of_update_property(np, new_compat);
+ }
+ return;
+}
+
static void __init armada_370_xp_dt_init(void)
{
+ if (of_machine_is_compatible("plathome,openblocks-ax3-4"))
+ i2c_quirk();
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
}
Patches currently in stable-queue which might be from gregory.clement@xxxxxxxxxxxxxxxxxx are
queue-3.12/ata-sata_mv-fix-disk-hotplug-for-armada-370-xp-socs.patch
queue-3.12/ata-sata_mv-introduce-compatible-string-marvell-armada-370-sata.patch
queue-3.12/arm-mvebu-add-support-to-get-the-id-and-the-revision-of-a-soc.patch
queue-3.12/i2c-mv64xxx-document-the-newly-introduced-armada-xp-a0-compatible.patch
queue-3.12/arm-mvebu-update-the-sata-compatible-string-for-armada-370-xp.patch
queue-3.12/i2c-mv64xxx-fix-bus-hang-on-a0-version-of-the-armada-xp-socs.patch
queue-3.12/arm-mvebu-add-quirk-for-i2c-for-the-openblocks-ax3-4-board.patch
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