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authorPeter Maydell <peter.maydell@linaro.org>2012-07-05 11:02:33 +0000
committerPeter Maydell <petmay01@cam-vm-266.(none)>2012-07-16 13:03:59 +0100
commit83c18d30e439f80d4f3965abfb1322cc29bc0a8a (patch)
treea691e5bedab91327591b54f028afb1285e37d995
parentffb8567f8e5781d8ff6b56b8080ee6dcb3a39db8 (diff)
downloadqemu-arm-83c18d30e439f80d4f3965abfb1322cc29bc0a8a.tar.gz
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 <peter.maydell@linaro.org>
-rw-r--r--device_tree.c30
-rw-r--r--device_tree.h4
2 files changed, 34 insertions, 0 deletions
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;
diff --git a/device_tree.h b/device_tree.h
index 2244270b2d..f7a3e6cfc5 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);