[PATCH 1/2] ARM: imx: add dt support of IRAM

[Jason Chen]

Signed-off-by: Jason Chen <jason.chen at linaro.org>
Signed-off-by: Eric Miao <eric.miao at linaro.org>
---
 arch/arm/plat-mxc/include/mach/iram.h |    6 ++++++
 arch/arm/plat-mxc/iram_alloc.c        |   16 ++++++++++++++++
 2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/arch/arm/plat-mxc/include/mach/iram.h b/arch/arm/plat-mxc/include/mach/iram.h
index 022690c..f8372cf 100644
--- a/arch/arm/plat-mxc/include/mach/iram.h
+++ b/arch/arm/plat-mxc/include/mach/iram.h
@@ -21,6 +21,7 @@
 #ifdef CONFIG_IRAM_ALLOC
 
 int __init iram_init(unsigned long base, unsigned long size);
+int __init of_iram_init(void);
 void __iomem *iram_alloc(unsigned int size, unsigned long *dma_addr);
 void iram_free(unsigned long dma_addr, unsigned int size);
 
@@ -31,6 +32,11 @@ static inline int __init iram_init(unsigned long base, unsigned long size)
 	return -ENOMEM;
 }
 
+static inline int __init of_iram_init(void)
+{
+	return -EINVAL;
+}
+
 static inline void __iomem *iram_alloc(unsigned int size, unsigned long *dma_addr)
 {
 	return NULL;
diff --git a/arch/arm/plat-mxc/iram_alloc.c b/arch/arm/plat-mxc/iram_alloc.c
index 074c386..f73ca9d 100644
--- a/arch/arm/plat-mxc/iram_alloc.c
+++ b/arch/arm/plat-mxc/iram_alloc.c
@@ -22,6 +22,8 @@
 #include <linux/module.h>
 #include <linux/spinlock.h>
 #include <linux/genalloc.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
 #include <mach/iram.h>
 
 static unsigned long iram_phys_base;
@@ -71,3 +73,17 @@ int __init iram_init(unsigned long base, unsigned long size)
 	pr_debug("i.MX IRAM pool: %ld KB at 0x%p\n", size / 1024, iram_virt_base);
 	return 0;
 }
+
+int __init of_iram_init(void)
+{
+	struct device_node *np;
+	struct resource res;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,imx-iram");
+	if (of_address_to_resource(np, 0, &res))
+		return -EINVAL;
+	if (res.start && (res.end > res.start))
+		return iram_init(res.start, res.end - res.start + 1);
+	else
+		return -EINVAL;
+}
-- 
1.7.4.1