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authorNicholas Piggin <npiggin@gmail.com>2017-04-19 05:12:18 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2017-05-09 22:55:58 +1000
commitea47dd191d543f81e0912b5dc0471b48346b016e (patch)
tree2b3c5bcee2b645be83f5be38a025041817194b06 /drivers/of
parent0b382fb3d905e2754302cf9097ffca13afb8b73f (diff)
downloadlinux-ea47dd191d543f81e0912b5dc0471b48346b016e.tar.bz2
of/fdt: introduce of_scan_flat_dt_subnodes and of_get_flat_dt_phandle
Introduce primitives for FDT parsing. These will be used for powerpc cpufeatures node scanning, which has quite complex structure but should be processed early. Cc: devicetree@vger.kernel.org Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/fdt.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index e5ce4b59e162..961ca97072a9 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -754,6 +754,36 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
}
/**
+ * of_scan_flat_dt_subnodes - scan sub-nodes of a node call callback on each.
+ * @it: callback function
+ * @data: context data pointer
+ *
+ * This function is used to scan sub-nodes of a node.
+ */
+int __init of_scan_flat_dt_subnodes(unsigned long parent,
+ int (*it)(unsigned long node,
+ const char *uname,
+ void *data),
+ void *data)
+{
+ const void *blob = initial_boot_params;
+ int node;
+
+ fdt_for_each_subnode(node, blob, parent) {
+ const char *pathp;
+ int rc;
+
+ pathp = fdt_get_name(blob, node, NULL);
+ if (*pathp == '/')
+ pathp = kbasename(pathp);
+ rc = it(node, pathp, data);
+ if (rc)
+ return rc;
+ }
+ return 0;
+}
+
+/**
* of_get_flat_dt_subnode_by_name - get the subnode by given name
*
* @node: the parent node
@@ -812,6 +842,14 @@ int __init of_flat_dt_match(unsigned long node, const char *const *compat)
return of_fdt_match(initial_boot_params, node, compat);
}
+/**
+ * of_get_flat_dt_prop - Given a node in the flat blob, return the phandle
+ */
+uint32_t __init of_get_flat_dt_phandle(unsigned long node)
+{
+ return fdt_get_phandle(initial_boot_params, node);
+}
+
struct fdt_scan_status {
const char *name;
int namelen;