From f0aa713f65e83ff39882b6c21d4b83500bf5ae80 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Fri, 20 Jul 2012 13:34:50 +0100 Subject: device_tree: Add support for reading device tree properties Add support for reading device tree properties (both generic and single-cell ones) to QEMU's convenience wrapper layer. Signed-off-by: Peter Maydell Reviewed-by: Peter A. G. Crosthwaite --- device_tree.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'device_tree.c') diff --git a/device_tree.c b/device_tree.c index b366fddeaf..d7a9b6bb89 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; -- cgit v1.2.3