[PATCH 01/17] of: add dma-mask binding

[Wenyou Yang <wenyou.yang-AIFe0yeh4nAAvxtiuMwx3w@public.gmane.org>]

From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj-sclMFOaUSTBWk0Htik3J/w@public.gmane.org>

This will allow each device to specify its dma-mask for this we use the
coherent_dma_mask as pointer. By default the dma-mask will be set to
DMA_BIT_MASK(32).
The microblaze architecture hook is drop

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj-sclMFOaUSTBWk0Htik3J/w@public.gmane.org>
Cc: grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org
Cc: rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
---
 drivers/of/platform.c |   23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index e44f8c2..11c765c 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -121,6 +121,21 @@ void of_device_make_bus_id(struct device *dev)
 	dev_set_name(dev, "%s.%d", node->name, magic - 1);
 }
 
+static void of_get_dma_mask(struct device *dev, struct device_node *np)
+{
+	const __be32 *prop;
+	int len;
+
+	prop = of_get_property(np, "dma-mask", &len);
+
+	dev->dma_mask = &dev->coherent_dma_mask;
+
+	if (!prop)
+		dev->coherent_dma_mask = DMA_BIT_MASK(32);
+	else
+		dev->coherent_dma_mask = of_read_number(prop, len / 4);
+}
+
 /**
  * of_device_alloc - Allocate and initialize an of_device
  * @np: device node to assign to device
@@ -161,10 +176,8 @@ struct platform_device *of_device_alloc(struct device_node *np,
 		WARN_ON(of_irq_to_resource_table(np, res, num_irq) != num_irq);
 	}
 
+	of_get_dma_mask(&dev->dev, np);
 	dev->dev.of_node = of_node_get(np);
-#if defined(CONFIG_MICROBLAZE)
-	dev->dev.dma_mask = &dev->archdata.dma_mask;
-#endif
 	dev->dev.parent = parent;
 
 	if (bus_id)
@@ -201,10 +214,6 @@ struct platform_device *of_platform_device_create_pdata(
 	if (!dev)
 		return NULL;
 
-#if defined(CONFIG_MICROBLAZE)
-	dev->archdata.dma_mask = 0xffffffffUL;
-#endif
-	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 	dev->dev.bus = &platform_bus_type;
 	dev->dev.platform_data = platform_data;
 
-- 
1.7.9.5