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authorAnatolij Gustschin <agust@denx.de>2010-08-18 11:25:20 +0200
committerWolfgang Denk <wd@denx.de>2010-10-12 21:05:58 +0200
commitbeca5a5f5bf0d88125580e5e9c1730469cd50ab8 (patch)
tree95d523b76c1423415fba50d3bce1ff3dcd7ff352
parentc000808b6aa08dc7f3137055866e6dcc3f7f8cdc (diff)
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fdt_support: support adding EDID property to FDT display nodes
Boards can pass display timing info for drivers using EDID block. Provide common function to add board specific EDID data to the device tree. Subsequent patch makes use of this functionality. Detailed timing descriptor data from EDID is used for programming the display controller. This is currently implemented on the Linux side by the fsl-diu-fb frame buffer driver and it is documented there in Documentation/powerpc/dts-bindings/fsl/diu.txt. Signed-off-by: Anatolij Gustschin <agust@denx.de> Acked-by: Detlev Zundel <dzu@denx.de> Cc: Gerald Van Baren <vanbaren@cideas.com>
-rw-r--r--common/fdt_support.c29
-rw-r--r--include/fdt_support.h1
2 files changed, 30 insertions, 0 deletions
diff --git a/common/fdt_support.c b/common/fdt_support.c
index 0ed6e77..9b65a8a 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -1189,3 +1189,32 @@ int fdt_alloc_phandle(void *blob)
return phandle + 1;
}
+
+#if defined(CONFIG_VIDEO)
+int fdt_add_edid(void *blob, const char *compat, unsigned char *edid_buf)
+{
+ int noff;
+ int ret;
+
+ noff = fdt_node_offset_by_compatible(blob, -1, compat);
+ if (noff != -FDT_ERR_NOTFOUND) {
+ debug("%s: %s\n", fdt_get_name(blob, noff, 0), compat);
+add_edid:
+ ret = fdt_setprop(blob, noff, "edid", edid_buf, 128);
+ if (ret == -FDT_ERR_NOSPACE) {
+ ret = fdt_increase_size(blob, 512);
+ if (!ret)
+ goto add_edid;
+ else
+ goto err_size;
+ } else if (ret < 0) {
+ printf("Can't add property: %s\n", fdt_strerror(ret));
+ return ret;
+ }
+ }
+ return 0;
+err_size:
+ printf("Can't increase blob size: %s\n", fdt_strerror(ret));
+ return ret;
+}
+#endif
diff --git a/include/fdt_support.h b/include/fdt_support.h
index fd94929..deb5dda 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -87,6 +87,7 @@ u64 fdt_translate_address(void *blob, int node_offset, const u32 *in_addr);
int fdt_node_offset_by_compat_reg(void *blob, const char *compat,
phys_addr_t compat_off);
int fdt_alloc_phandle(void *blob);
+int fdt_add_edid(void *blob, const char *compat, unsigned char *buf);
#endif /* ifdef CONFIG_OF_LIBFDT */
#endif /* ifndef __FDT_SUPPORT_H */