From 7b56cb1a1eeef645883d26783e8e8e2306a0e334 Mon Sep 17 00:00:00 2001
From: Alison Wang <b18965@freescale.com>
Date: Wed, 13 May 2015 09:46:13 +0800
Subject: arm: ls1021a: add platform notifier for dma-coherent requirement

This patch adds platform notifier for dma-coherent requirement.
Structure arm_coherent_dma_ops is used instead of arm_dma_ops.

Signed-off-by: Alison Wang <alison.wang@freescale.com>
Change-Id: I55e755b5ead1cb50ff9ca2e6838588a04e5ea9e7
Reviewed-on: http://git.am.freescale.net:8181/36291
Tested-by: Review Code-CDREVIEW <CDREVIEW@freescale.com>
Reviewed-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Reviewed-by: Zhengxiong Jin <Jason.Jin@freescale.com>

diff --git a/arch/arm/mach-imx/mach-ls1021a.c b/arch/arm/mach-imx/mach-ls1021a.c
index 3692dd0..dbb0256 100644
--- a/arch/arm/mach-imx/mach-ls1021a.c
+++ b/arch/arm/mach-imx/mach-ls1021a.c
@@ -10,13 +10,36 @@
 #include <linux/clk-provider.h>
 #include <linux/clockchips.h>
 #include <linux/clocksource.h>
+#include <linux/dma-mapping.h>
 #include <linux/of_platform.h>
 #include <asm/mach/arch.h>
 
 #include "common.h"
 
+static int ls1021a_platform_notifier(struct notifier_block *nb,
+				  unsigned long event, void *__dev)
+{
+	struct device *dev = __dev;
+
+	if (event != BUS_NOTIFY_ADD_DEVICE)
+		return NOTIFY_DONE;
+
+	if (of_device_is_compatible(dev->of_node, "fsl,etsec2"))
+		set_dma_ops(dev, &arm_coherent_dma_ops);
+	else if (of_property_read_bool(dev->of_node, "dma-coherent"))
+		set_dma_ops(dev, &arm_coherent_dma_ops);
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block ls1021a_platform_nb = {
+	.notifier_call = ls1021a_platform_notifier,
+};
+
 static void __init ls1021a_init_machine(void)
 {
+	bus_register_notifier(&platform_bus_type, &ls1021a_platform_nb);
+
 	mxc_arch_reset_init_dt();
 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 }
-- 
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