From c38960d7f3fd929fa916ac696fcfb8a7b5534c8d Mon Sep 17 00:00:00 2001 From: Patrick Rudolph Date: Tue, 8 May 2018 11:18:54 +0200 Subject: lib/device_tree: Add method to get phandle Add a method to retrieve a node's phandle. Useful for board specific devicetree manipulations. Change-Id: I966151ad7e82fc678ab4f56cf9b5868ef39398e0 Signed-off-by: Patrick Rudolph Reviewed-on: https://review.coreboot.org/26191 Tested-by: build bot (Jenkins) Reviewed-by: Julius Werner --- src/include/device_tree.h | 2 ++ src/lib/device_tree.c | 22 ++++++++++++++++++++++ 2 files changed, 24 insertions(+) (limited to 'src') diff --git a/src/include/device_tree.h b/src/include/device_tree.h index 107fcf6a48..54aecb98b8 100644 --- a/src/include/device_tree.h +++ b/src/include/device_tree.h @@ -147,6 +147,8 @@ struct device_tree_node *dt_find_next_compat_child(struct device_tree_node *pare // Look up a node relative to a parent node, through its property value. struct device_tree_node *dt_find_prop_value(struct device_tree_node *parent, const char *name, void *data, size_t size); +// Return the phandle +uint32_t dt_get_phandle(struct device_tree_node *node); // Write src into *dest as a 'length'-byte big-endian integer. void dt_write_int(u8 *dest, u64 src, size_t length); // Add different kinds of properties to a node, or update existing ones. diff --git a/src/lib/device_tree.c b/src/lib/device_tree.c index 0a88c1f886..de14c15536 100644 --- a/src/lib/device_tree.c +++ b/src/lib/device_tree.c @@ -725,6 +725,28 @@ struct device_tree_node *dt_find_prop_value(struct device_tree_node *parent, return NULL; } +/** + * Find the phandle of a node. + * + * @param node Pointer to node containing the phandle + * @return Zero on error, the phandle on success + */ +uint32_t dt_get_phandle(struct device_tree_node *node) +{ + uint32_t *phandle; + size_t len; + + dt_find_bin_prop(node, "phandle", (void **)&phandle, &len); + if (phandle != NULL && len == sizeof(*phandle)) + return be32_to_cpu(*phandle); + + dt_find_bin_prop(node, "linux,phandle", (void **)&phandle, &len); + if (phandle != NULL && len == sizeof(*phandle)) + return be32_to_cpu(*phandle); + + return 0; +} + /* * Write an arbitrary sized big-endian integer into a pointer. * -- cgit v1.2.3