fdt: Add new fdt_set_node_status & fdt_set_status_by_alias helpers

Add common function fdt_set_node_status() to assist in various locations
that we set a nodes status.  This function utilizes the status values
that are part of the EPAPR spec (on power.org).

fdt_set_status_by_alias() is based on fdt_set_node_status() but uses an
alias string to identify the node to update.

We also add some shortcut functions to help the common cases of setting
"okay" and "disabled":

	fdt_status_okay()
	fdt_status_disabled()
	fdt_status_okay_by_alias()
	fdt_status_disabled_by_alias()

Finally, we fixup the corenet_ds ethernet code which previously had
a function by the same name that can be replaced with the new helpers.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Gerald Van Baren <vanbaren@cideas.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/include/fdt_support.h b/include/fdt_support.h
index 4826eee..c7b4605 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -104,5 +104,33 @@ int fdt_verify_alias_address(void *fdt, int anode, const char *alias,
 			      u64 addr);
 u64 fdt_get_base_address(void *fdt, int node);
 
+enum fdt_status {
+	FDT_STATUS_OKAY,
+	FDT_STATUS_DISABLED,
+	FDT_STATUS_FAIL,
+	FDT_STATUS_FAIL_ERROR_CODE,
+};
+int fdt_set_node_status(void *fdt, int nodeoffset,
+			enum fdt_status status, unsigned int error_code);
+static inline int fdt_status_okay(void *fdt, int nodeoffset)
+{
+	return fdt_set_node_status(fdt, nodeoffset, FDT_STATUS_OKAY, 0);
+}
+static inline int fdt_status_disabled(void *fdt, int nodeoffset)
+{
+	return fdt_set_node_status(fdt, nodeoffset, FDT_STATUS_DISABLED, 0);
+}
+
+int fdt_set_status_by_alias(void *fdt, const char* alias,
+			    enum fdt_status status, unsigned int error_code);
+static inline int fdt_status_okay_by_alias(void *fdt, const char* alias)
+{
+	return fdt_set_status_by_alias(fdt, alias, FDT_STATUS_OKAY, 0);
+}
+static inline int fdt_status_disabled_by_alias(void *fdt, const char* alias)
+{
+	return fdt_set_status_by_alias(fdt, alias, FDT_STATUS_DISABLED, 0);
+}
+
 #endif /* ifdef CONFIG_OF_LIBFDT */
 #endif /* ifndef __FDT_SUPPORT_H */