From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:44189) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SqlHt-0004pM-0p for qemu-devel@nongnu.org; Mon, 16 Jul 2012 09:24:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SqlHn-0001OA-3h for qemu-devel@nongnu.org; Mon, 16 Jul 2012 09:24:32 -0400 Received: from mnementh.archaic.org.uk ([81.2.115.146]:44364) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SqlHm-0001NI-TG for qemu-devel@nongnu.org; Mon, 16 Jul 2012 09:24:27 -0400 From: Peter Maydell Date: Mon, 16 Jul 2012 14:24:14 +0100 Message-Id: <1342445056-9129-5-git-send-email-peter.maydell@linaro.org> In-Reply-To: <1342445056-9129-1-git-send-email-peter.maydell@linaro.org> References: <1342445056-9129-1-git-send-email-peter.maydell@linaro.org> Subject: [Qemu-devel] [PATCH v2 4/6] device_tree: Add support for reading device tree properties List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Peter Crosthwaite , patches@linaro.org Add support for reading device tree properties (both generic and single-cell ones) to QEMU's convenience wrapper layer. Signed-off-by: Peter Maydell --- device_tree.c | 30 ++++++++++++++++++++++++++++++ device_tree.h | 4 ++++ 2 files changed, 34 insertions(+), 0 deletions(-) diff --git a/device_tree.c b/device_tree.c index b366fdd..d7a9b6b 100644 --- a/device_tree.c +++ b/device_tree.c @@ -178,6 +178,36 @@ int qemu_devtree_setprop_string(void *fdt, const char *node_path, return r; } +const void *qemu_devtree_getprop(void *fdt, const char *node_path, + const char *property, int *lenp) +{ + int len; + const void *r; + if (!lenp) { + lenp = &len; + } + r = fdt_getprop(fdt, findnode_nofail(fdt, node_path), property, lenp); + if (!r) { + fprintf(stderr, "%s: Couldn't get %s/%s: %s\n", __func__, + node_path, property, fdt_strerror(*lenp)); + exit(1); + } + return r; +} + +uint32_t qemu_devtree_getprop_cell(void *fdt, const char *node_path, + const char *property) +{ + int len; + const uint32_t *p = qemu_devtree_getprop(fdt, node_path, property, &len); + if (len != 4) { + fprintf(stderr, "%s: %s/%s not 4 bytes long (not a cell?)\n", + __func__, node_path, property); + exit(1); + } + return be32_to_cpu(*p); +} + uint32_t qemu_devtree_get_phandle(void *fdt, const char *path) { uint32_t r; diff --git a/device_tree.h b/device_tree.h index 2244270..f7a3e6c 100644 --- a/device_tree.h +++ b/device_tree.h @@ -28,6 +28,10 @@ int qemu_devtree_setprop_string(void *fdt, const char *node_path, int qemu_devtree_setprop_phandle(void *fdt, const char *node_path, const char *property, const char *target_node_path); +const void *qemu_devtree_getprop(void *fdt, const char *node_path, + const char *property, int *lenp); +uint32_t qemu_devtree_getprop_cell(void *fdt, const char *node_path, + const char *property); uint32_t qemu_devtree_get_phandle(void *fdt, const char *path); uint32_t qemu_devtree_alloc_phandle(void *fdt); int qemu_devtree_nop_node(void *fdt, const char *node_path); -- 1.7.5.4