peppy: Disable unused clocks
CLKOUT for PCIE ports 2-5 and CLKOUT_XDP are not used
and can be disabled.
This change was modled after the change made in Falco:
Falco-Change-Id: I0f996e90f0ae42780de3a0c8dc5db00ec600748b
The only difference per schematic for Peppy was PCIe 1 supports
a NGFF interface. PCIe 0 is connected to WLAN.
BUG=chrome-os-partner:21780
BRANCH=peppy
TEST=manual
Change-Id: Ib4871cb2655316cb260ab33ada6b9d81f271377f
Signed-off-by: Steven Sherk <steven.sherk@se-eng.com>
Reviewed-on: https://gerrit.chromium.org/gerrit/66693
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: Shawn Nematbakhsh <shawnn@chromium.org>
Commit-Queue: Shawn Nematbakhsh <shawnn@chromium.org>
diff --git a/src/mainboard/google/peppy/devicetree.cb b/src/mainboard/google/peppy/devicetree.cb
index b6b7495..4c0d02d 100644
--- a/src/mainboard/google/peppy/devicetree.cb
+++ b/src/mainboard/google/peppy/devicetree.cb
@@ -81,6 +81,9 @@
# Force enable ASPM for PCIe Port1
register "pcie_port_force_aspm" = "0x01"
+ # Disable PCIe CLKOUT 2-5 and CLKOUT_XDP
+ register "icc_clock_disable" = "0x013c0000"
+
device pci 13.0 off end # Smart Sound Audio DSP
device pci 14.0 on end # USB3 XHCI
device pci 15.0 on end # Serial I/O DMA
