1 files changed, 48 insertions, 0 deletions
diff --git a/src/mainboard/google/nyan/devicetree.cb b/src/mainboard/google/nyan/devicetree.cb
index 392a5ae0c1..623c5a196c 100644
--- a/src/mainboard/google/nyan/devicetree.cb
+++ b/src/mainboard/google/nyan/devicetree.cb
@@ -19,4 +19,52 @@
 
 chip soc/nvidia/tegra124
 	device cpu_cluster 0 on end
+# N.B. We ae not using the device tree in an effective way.
+# We need to change this in future such that the on-soc
+# devices are 'chips', which will allow us to go at them
+# in parallel. This is even easier on the ARM SOCs since there
+# are no single-access resources such as the infamous
+# cf8/cfc registers found on PCs.
+	register "display_controller" = "TEGRA_ARM_DISPLAYA"
+	register "xres" = "2560"
+	register "yres" = "1700"
+	register "framebuffer_bits_per_pixel" = "24"
+	register "cache_policy" = "DCACHE_WRITETHROUGH"
+
+	# With some help from the mainbaord designer
+	register "backlight_en_gpio" = "GPIO(H2)"
+	register "lvds_shutdown_gpio" = "0"
+	register "backlight_vdd_gpio" = "GPIO(P2)"
+	register "panel_vdd_gpio" = "0"
+	register "pwm" = "GPIO(H1)"
+
+# taken from u-boot; these look wrong however.
+	register "vdd_delay" = "400"
+	register "vdd_data_delay" = "4"
+	register "data_backlight_delay" = "203"
+	register "backlight_pwm_delay" = "17"
+	register "pwm_backlight_en_delay" = "15"
+
+# How to compute these: xrandr --verbose will give you this:
+#Detailed mode: Clock 285.250 MHz, 272 mm x 181 mm
+#               2560 2608 2640 2720 hborder 0
+#               1700 1703 1713 1749 vborder 0
+#Then you can compute your values:
+#H front porch = 2608 - 2560 = 48
+#H sync = 2640 - 2608 = 32
+#H back porch = 2720 - 2640 = 80
+#V front porch = 1703 - 1700 = 3
+#V sync = 1713 - 1703 = 10
+#V back porch = 1749 - 1713 = 36
+#href_to_sync and vref_to_sync are from the vendor
+
+	register "href_to_sync" = "11"
+	register "hfront_porch" = "48"
+	register "hsync_width" = "32"
+	register "hback_porch" = "80"
+
+	register "vref_to_sync" = "1"
+	register "vfront_porch" = "3"
+	register "vsync_width" = "10"
+	register "vback_porch" = "36"
 end