[PATCH 2/2] dt-binding: add header to define types and conversion

[Laxman Dewangan <ldewangan@nvidia.com>]

Add a header file to define the macros for type conversion
to be used by DTS file.

Add macro for the S32 to U32 conversion by using 2's complement.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
---
 include/dt-bindings/types.h |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)
 create mode 100644 include/dt-bindings/types.h

diff --git a/include/dt-bindings/types.h b/include/dt-bindings/types.h
new file mode 100644
index 0000000..2b7ea75
--- /dev/null
+++ b/include/dt-bindings/types.h
@@ -0,0 +1,18 @@
+/*
+ * This header provides macros for different types and conversions
+ */
+
+#ifndef _DT_BINDINGS_TYPES_H_
+#define _DT_BINDINGS_TYPES_H_
+
+/*
+ * S32_TO_U32: This macro converts the signed number to 2's complement
+ * unisgned number. E.g. S32_TO_U32(-3) will be 0xfffffffd and
+ * S32_TO_U32(3) will be 0x3;
+ * Use of_property_read_s32() for getting back the correct signed value
+ * in driver.
+ */
+#define S32_TO_U32(x) (((x) < 0) ? (((-(x)) ^ 0xFFFFFFFFU) + 1) : (x))
+
+#endif
+
-- 
1.7.0.4