From beca5a5f5bf0d88125580e5e9c1730469cd50ab8 Mon Sep 17 00:00:00 2001 From: Anatolij Gustschin Date: Wed, 18 Aug 2010 11:25:20 +0200 Subject: 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 Acked-by: Detlev Zundel Cc: Gerald Van Baren --- common/fdt_support.c | 29 +++++++++++++++++++++++++++++ include/fdt_support.h | 1 + 2 files changed, 30 insertions(+) diff --git a/common/fdt_support.c b/common/fdt_support.c index 0ed6e7729..9b65a8adf 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 fd94929ce..deb5dda5c 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 */ -- cgit v1.2.3