From 0d590b7d915f47c2102b2515aca8b608205c4258 Mon Sep 17 00:00:00 2001 From: Cliff Huang Date: Thu, 28 Apr 2022 18:20:27 -0700 Subject: soc/intel/alderlake: add support for external source clock Support up to 10 PCIe source clock out, including source clock out 7, 8, 9. This allows boards to use source clock 7, 8, 9. BUG=b:233252409 BRANCH=firmware-brya-14505.B Signed-off-by: Cliff Huang Change-Id: I0296974fb8557de1edea7f9ca2d96db0afd8a743 Reviewed-on: https://review.coreboot.org/c/coreboot/+/63943 Reviewed-by: Bora Guvendik Tested-by: build bot (Jenkins) Reviewed-by: Eric Lai --- src/soc/intel/alderlake/Kconfig | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/soc/intel/alderlake/Kconfig b/src/soc/intel/alderlake/Kconfig index 4e10f3d2de..e6151313ae 100644 --- a/src/soc/intel/alderlake/Kconfig +++ b/src/soc/intel/alderlake/Kconfig @@ -232,11 +232,17 @@ config MAX_ROOT_PORTS default MAX_PCH_ROOT_PORTS config MAX_PCIE_CLOCK_SRC + prompt "Number of Source Clock supported from SOC" int default 6 if SOC_INTEL_ALDERLAKE_PCH_M default 5 if SOC_INTEL_ALDERLAKE_PCH_N - default 7 if SOC_INTEL_ALDERLAKE_PCH_P default 18 if SOC_INTEL_ALDERLAKE_PCH_S + default 10 if SOC_INTEL_ALDERLAKE_PCH_P + help + With external clock buffer, Alderlake-P can support up to three additional source clocks. + This is done by setting the corresponding GPIO pin(s) to native function to use as + SRCCLK_OE[6..9]. In addition, SRCCLK6 does not need to be set to free running clock. + If any of SRCCLKReq 6..9 is asserted, SRCCLK6 will be turned on. config MAX_PCIE_CLOCK_REQ int -- cgit v1.2.3