powerpc: Add del_node() for early boot code to prune inapplicable devices.

Some platforms have variants that can share most of a flat device tree but need
a few devices selectively pruned at boot time.  This adds del_node() to ops.h
to allow access to the existing fdt_del_node().

Signed-off-by: Mike Ditto <mditto@consentry.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 12 insertions, 0 deletions

diff --git a/arch/powerpc/boot/libfdt-wrapper.c b/arch/powerpc/boot/libfdt-wrapper.c
index 1daa73f08ba8..9276327bc2bb 100644
--- a/arch/powerpc/boot/libfdt-wrapper.c
+++ b/arch/powerpc/boot/libfdt-wrapper.c
@@ -105,6 +105,11 @@ static int fdt_wrapper_setprop(const void *devp, const char *name,
         return check_err(rc);
 }
 
+static int fdt_wrapper_del_node(const void *devp)
+{
+        return fdt_del_node(fdt, devp_offset(devp));
+}
+
 static void *fdt_wrapper_get_parent(const void *devp)
 {
         return offset_devp(fdt_parent_offset(fdt, devp_offset(devp)));
@@ -174,6 +179,7 @@ void fdt_init(void *blob)
         dt_ops.create_node = fdt_wrapper_create_node;
         dt_ops.find_node_by_prop_value = fdt_wrapper_find_node_by_prop_value;
         dt_ops.find_node_by_compatible = fdt_wrapper_find_node_by_compatible;
+        dt_ops.del_node = fdt_wrapper_del_node;
         dt_ops.get_path = fdt_wrapper_get_path;
         dt_ops.finalize = fdt_wrapper_finalize;
 
diff --git a/arch/powerpc/boot/ops.h b/arch/powerpc/boot/ops.h
index 321e2f5afe71..b3218ce451bb 100644
--- a/arch/powerpc/boot/ops.h
+++ b/arch/powerpc/boot/ops.h
@@ -40,6 +40,7 @@ struct dt_ops {
                         const int buflen);
         int     (*setprop)(const void *phandle, const char *name,
                         const void *buf, const int buflen);
+        int (*del_node)(const void *phandle);
         void *(*get_parent)(const void *phandle);
         /* The node must not already exist. */
         void *(*create_node)(const void *parent, const char *name);
@@ -126,6 +127,11 @@ static inline int setprop_str(void *devp, const char *name, const char *buf)
         return -1;
 }
 
+static inline int del_node(const void *devp)
+{
+        return dt_ops.del_node ? dt_ops.del_node(devp) : -1;
+}
+
 static inline void *get_parent(const char *devp)
 {
         return dt_ops.get_parent ? dt_ops.get_parent(devp) : NULL;