diff options
| -rw-r--r-- | common/fdt_support.c | 29 | ||||
| -rw-r--r-- | include/fdt_support.h | 13 |
2 files changed, 42 insertions, 0 deletions
diff --git a/common/fdt_support.c b/common/fdt_support.c index 8266bca7d6..c5ed5ad89e 100644 --- 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; +} diff --git a/include/fdt_support.h b/include/fdt_support.h index ae5e8a3ef6..5d4f28dc78 100644 --- a/include/fdt_support.h +++ b/include/fdt_support.h @@ -47,6 +47,19 @@ 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); +/** + * Update native-mode property of display-timings node to the phandle + * of the timings matching a display by name (case insensitive). + * + * see kernel Documentation/devicetree/bindings/video/display-timing.txt + * + * @param blob FDT blob to update + * @param path path within dt + * @param display name of display timing to match + * @return 0 if ok, or -FDT_ERR_... on error + */ +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); #else |
