[POWERPC] bootwrapper: Add find_node_by_compatible

Add the ability to find a device node by just what its compatible with.
This is useful in cases that we don't have a prop to find the node with.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

2 files changed, 20 insertions, 0 deletions

diff --git a/arch/powerpc/boot/libfdt-wrapper.c b/arch/powerpc/boot/libfdt-wrapper.c
index 97af36c224bd..59016bef1391 100644
--- a/arch/powerpc/boot/libfdt-wrapper.c
+++ b/arch/powerpc/boot/libfdt-wrapper.c
@@ -133,6 +133,14 @@ static void *fdt_wrapper_find_node_by_prop_value(const void *prev,
         return offset_devp(offset);
 }
 
+static void *fdt_wrapper_find_node_by_compatible(const void *prev,
+                                                 const char *val)
+{
+        int offset = fdt_node_offset_by_compatible(fdt, devp_offset_find(prev),
+                                                   val);
+        return offset_devp(offset);
+}
+
 static char *fdt_wrapper_get_path(const void *devp, char *buf, int len)
 {
         int rc;
@@ -164,6 +172,7 @@ void fdt_init(void *blob)
         dt_ops.get_parent = fdt_wrapper_get_parent;
         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.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 5872ef1779ae..4b0544b03c64 100644
--- a/arch/powerpc/boot/ops.h
+++ b/arch/powerpc/boot/ops.h
@@ -46,6 +46,8 @@ struct dt_ops {
         void *(*find_node_by_prop_value)(const void *prev,
                                          const char *propname,
                                          const char *propval, int proplen);
+        void *(*find_node_by_compatible)(const void *prev,
+                                         const char *compat);
         unsigned long (*finalize)(void);
         char *(*get_path)(const void *phandle, char *buf, int len);
 };
@@ -172,6 +174,15 @@ static inline void *find_node_by_alias(const char *alias)
         return NULL;
 }
 
+static inline void *find_node_by_compatible(const void *prev,
+                                            const char *compat)
+{
+        if (dt_ops.find_node_by_compatible)
+                return dt_ops.find_node_by_compatible(prev, compat);
+
+        return NULL;
+}
+
 void dt_fixup_memory(u64 start, u64 size);
 void dt_fixup_cpu_clocks(u32 cpufreq, u32 tbfreq, u32 busfreq);
 void dt_fixup_clock(const char *path, u32 freq);