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fdt_support: support adding EDID property to FDT display nodes

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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>
This commit is contained in:
Anatolij Gustschin
2010-08-18 11:25:20 +02:00
committed by Wolfgang Denk
parent c000808b6a
commit beca5a5f5b
2 changed files with 30 additions and 0 deletions
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29
common/fdt_support.c
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@@ -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