[PATCH 2/5] staging: fsl-mc: define a macro to differentiate root dprc

[Lijun Pan <Lijun.Pan@freescale.com>]

Define is_root_dprc(dev) to tell whether a device is
root dprc or not via platform_bus_type.

Signed-off-by: Lijun Pan <Lijun.Pan@freescale.com>
---
 drivers/staging/fsl-mc/include/mc.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/staging/fsl-mc/include/mc.h b/drivers/staging/fsl-mc/include/mc.h
index a933291..483763e 100644
--- a/drivers/staging/fsl-mc/include/mc.h
+++ b/drivers/staging/fsl-mc/include/mc.h
@@ -14,6 +14,7 @@
 #include <linux/device.h>
 #include <linux/mod_devicetable.h>
 #include <linux/list.h>
+#include <linux/platform_device.h>
 #include "../include/dprc.h"
 
 #define FSL_MC_VENDOR_FREESCALE	0x1957
@@ -109,6 +110,15 @@ struct fsl_mc_resource {
 #define FSL_MC_IS_DPRC	0x0001
 
 /**
+  * root dprc's parent is a platform device
+  * that platform device's bus type is platform_bus_type.
+  */
+#define is_root_dprc(dev) \
+	((to_fsl_mc_device(dev)->flags & FSL_MC_IS_DPRC) && \
+	((dev)->bus == &fsl_mc_bus_type) && \
+	((dev)->parent->bus == &platform_bus_type))
+
+/**
  * Default DMA mask for devices on a fsl-mc bus
  */
 #define FSL_MC_DEFAULT_DMA_MASK	(~0ULL)
-- 
2.3.3