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Diffstat (limited to 'src/mainboard/google/nyan_big/devicetree.cb')
| -rw-r--r-- | src/mainboard/google/nyan_big/devicetree.cb | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/mainboard/google/nyan_big/devicetree.cb b/src/mainboard/google/nyan_big/devicetree.cb new file mode 100644 index 0000000000..cb55b72b93 --- /dev/null +++ b/src/mainboard/google/nyan_big/devicetree.cb @@ -0,0 +1,80 @@ +## +## This file is part of the coreboot project. +## +## Copyright 2014 Google Inc. +## +## This program is free software; you can redistribute it and/or modify +## it under the terms of the GNU General Public License as published by +## the Free Software Foundation; version 2 of the License. +## +## This program is distributed in the hope that it will be useful, +## but WITHOUT ANY WARRANTY; without even the implied warranty of +## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +## GNU General Public License for more details. +## +## You should have received a copy of the GNU General Public License +## along with this program; if not, write to the Free Software +## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +## + +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" = "1366" + register "yres" = "768" + # this setting is what nvidia does; it makes no sense + # and does not agree with hardware. Why'd they do it? + register "framebuffer_bits_per_pixel" = "18" + 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 +#this is just an example for a Pixel panel; other panels differ. +# Here is a peppy panel: +# 1366x768 (0x45) 76.4MHz -HSync -VSync *current +preferred +# h: width 1366 start 1502 end 1532 total 1592 +# v: height 768 start 776 end 788 total 800 +# These numbers were provided by Nvidia. + register "href_to_sync" = "1" + register "hfront_porch" = "44" + register "hsync_width" = "46" + register "hback_porch" = "44" + + register "vref_to_sync" = "1" + register "vfront_porch" = "6" + register "vsync_width" = "8" + register "vback_porch" = "6" + + # we *know* the pixel clock for this system. + register "pixel_clock" = "71" +end |