Add 'fdt_fixup_display' function to fixup device-tree for a specific
display. This is useful if a device-tree has configurations for multiple
display timings for undetectable displays.
Signed-off-by: Tim Harvey <thar...@gateworks.com>
---
common/fdt_support.c | 31 +++++++++++++++++++++++++++++++
include/fdt_support.h | 1 +
2 files changed, 32 insertions(+)
diff --git a/common/fdt_support.c b/common/fdt_support.c
index 8266bca..60609e5 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -1560,3 +1560,34 @@ 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 -1;
+
+ 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 handle = fdt_get_phandle(blob, off);
+ debug("%s:0x%x\n", fdt_get_name(blob, off, NULL),
+ fdt32_to_cpu(handle));
+ if (strcasecmp(fdt_get_name(blob, off, NULL), display) == 0) {
+ fdt_setprop_u32(blob, toff, "native-mode", handle);
+ break;
+ }
+ }
+ return toff;
+}
diff --git a/include/fdt_support.h b/include/fdt_support.h
index ae5e8a3..98379d3 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -46,6 +46,7 @@ void fdt_fixup_ethernet(void *fdt);
int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
const void *val, int len, int create);
void fdt_fixup_qe_firmware(void *fdt);
+int fdt_fixup_display(void *blob, const char *path, const char *display);
#if defined(CONFIG_HAS_FSL_DR_USB) || defined(CONFIG_HAS_FSL_MPH_USB)
void fdt_fixup_dr_usb(void *blob, bd_t *bd);
--
1.9.1
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