fdt: add new fdt_fixup_display function to configure display

[karo-tx-uboot.git] / common / fdt_support.c

diff --git a/common/fdt_support.c b/common/fdt_support.c
index 8266bca7d6489a2ca8fb6f1015064184b137d2dd..c5ed5ad89eec13d0f6b1b04cbaf3a2631f25a060 100644 (file)
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -1560,3 +1560,32 @@ int fdt_setup_simplefb_node(void *fdt, int node, u64 base_address, u32 width,
 
        return 0;
 }
+
+/*
+ * Update native-mode in display-timings from display environment variable.
+ * The node to update are specified by path.
+ */
+int fdt_fixup_display(void *blob, const char *path, const char *display)
+{
+       int off, toff;
+
+       if (!display || !path)
+               return -FDT_ERR_NOTFOUND;
+
+       toff = fdt_path_offset(blob, path);
+       if (toff >= 0)
+               toff = fdt_subnode_offset(blob, toff, "display-timings");
+       if (toff < 0)
+               return toff;
+
+       for (off = fdt_first_subnode(blob, toff);
+            off >= 0;
+            off = fdt_next_subnode(blob, off)) {
+               uint32_t h = fdt_get_phandle(blob, off);
+               debug("%s:0x%x\n", fdt_get_name(blob, off, NULL),
+                     fdt32_to_cpu(h));
+               if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0)
+                       return fdt_setprop_u32(blob, toff, "native-mode", h);
+       }
+       return toff;
+}