From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laxman Dewangan Subject: [PATCH 2/2] dt-binding: add header to define types and conversion Date: Thu, 12 Dec 2013 18:54:53 +0530 Message-ID: <1386854693-10871-2-git-send-email-ldewangan@nvidia.com> References: <1386854693-10871-1-git-send-email-ldewangan@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1386854693-10871-1-git-send-email-ldewangan@nvidia.com> Sender: linux-kernel-owner@vger.kernel.org To: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, grant.likely@linaro.org Cc: ijc+devicetree@hellion.org.uk, galak@codeaurora.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, swarren@nvidia.com, kerwinw@nvidia.com, Laxman Dewangan List-Id: devicetree@vger.kernel.org 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 --- 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