From 12e671142daa5d4dce5961e6f573a8b740b16f88 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Tue, 14 Apr 2015 21:03:21 -0600 Subject: fdt: Add binding decode function for display-timings This is useful for display parameters. Add a simple decode function to read from this device tree node. Signed-off-by: Simon Glass Signed-off-by: Tom Warren --- lib/fdtdec.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) (limited to 'lib') diff --git a/lib/fdtdec.c b/lib/fdtdec.c index b76d9cad83..1007fa0372 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -1037,6 +1037,98 @@ int fdtdec_decode_memory_region(const void *blob, int config_node, return 0; } +static int decode_timing_property(const void *blob, int node, const char *name, + struct timing_entry *result) +{ + int length, ret = 0; + const u32 *prop; + + prop = fdt_getprop(blob, node, name, &length); + if (!prop) { + debug("%s: could not find property %s\n", + fdt_get_name(blob, node, NULL), name); + return length; + } + + if (length == sizeof(u32)) { + result->typ = fdtdec_get_int(blob, node, name, 0); + result->min = result->typ; + result->max = result->typ; + } else { + ret = fdtdec_get_int_array(blob, node, name, &result->min, 3); + } + + return ret; +} + +int fdtdec_decode_display_timing(const void *blob, int parent, int index, + struct display_timing *dt) +{ + int i, node, timings_node; + u32 val = 0; + int ret = 0; + + timings_node = fdt_subnode_offset(blob, parent, "display-timings"); + if (timings_node < 0) + return timings_node; + + for (i = 0, node = fdt_first_subnode(blob, timings_node); + node > 0 && i != index; + node = fdt_next_subnode(blob, node)) + i++; + + if (node < 0) + return node; + + memset(dt, 0, sizeof(*dt)); + + ret |= decode_timing_property(blob, node, "hback-porch", + &dt->hback_porch); + ret |= decode_timing_property(blob, node, "hfront-porch", + &dt->hfront_porch); + ret |= decode_timing_property(blob, node, "hactive", &dt->hactive); + ret |= decode_timing_property(blob, node, "hsync-len", &dt->hsync_len); + ret |= decode_timing_property(blob, node, "vback-porch", + &dt->vback_porch); + ret |= decode_timing_property(blob, node, "vfront-porch", + &dt->vfront_porch); + ret |= decode_timing_property(blob, node, "vactive", &dt->vactive); + ret |= decode_timing_property(blob, node, "vsync-len", &dt->vsync_len); + ret |= decode_timing_property(blob, node, "clock-frequency", + &dt->pixelclock); + + dt->flags = 0; + val = fdtdec_get_int(blob, node, "vsync-active", -1); + if (val != -1) { + dt->flags |= val ? DISPLAY_FLAGS_VSYNC_HIGH : + DISPLAY_FLAGS_VSYNC_LOW; + } + val = fdtdec_get_int(blob, node, "hsync-active", -1); + if (val != -1) { + dt->flags |= val ? DISPLAY_FLAGS_HSYNC_HIGH : + DISPLAY_FLAGS_HSYNC_LOW; + } + val = fdtdec_get_int(blob, node, "de-active", -1); + if (val != -1) { + dt->flags |= val ? DISPLAY_FLAGS_DE_HIGH : + DISPLAY_FLAGS_DE_LOW; + } + val = fdtdec_get_int(blob, node, "pixelclk-active", -1); + if (val != -1) { + dt->flags |= val ? DISPLAY_FLAGS_PIXDATA_POSEDGE : + DISPLAY_FLAGS_PIXDATA_NEGEDGE; + } + + if (fdtdec_get_bool(blob, node, "interlaced")) + dt->flags |= DISPLAY_FLAGS_INTERLACED; + if (fdtdec_get_bool(blob, node, "doublescan")) + dt->flags |= DISPLAY_FLAGS_DOUBLESCAN; + if (fdtdec_get_bool(blob, node, "doubleclk")) + dt->flags |= DISPLAY_FLAGS_DOUBLECLK; + + return 0; +} + int fdtdec_setup(void) { #ifdef CONFIG_OF_CONTROL -- cgit v1.2.3