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@xxxxxxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
