From 8725e5f639cb71f405005586e01d6efa0042dc4b Mon Sep 17 00:00:00 2001 From: Tony Huang Date: Tue, 23 Apr 2019 22:05:01 +0800 Subject: mb/google/octopus: I2C clock tuning for bloog Tune I2C params for I2C buses 5, 6, and 7 to ensure that the frequency does not exceed 400KHz. BUG=b:131132499, b:128998988 BRANCH=octopus TEST=emerge-octopus coreboot chromeos-bootimage and measured frequency under 400 KHz Change-Id: Ie8cfba72a0654402ccb0274c00b44fbfa2deea21 Signed-off-by: Tony Huang Reviewed-on: https://review.coreboot.org/c/coreboot/+/32404 Tested-by: build bot (Jenkins) Reviewed-by: Karthik Ramasubramanian Reviewed-by: Justin TerAvest Reviewed-by: Furquan Shaikh --- .../google/octopus/variants/bloog/overridetree.cb | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'src/mainboard') diff --git a/src/mainboard/google/octopus/variants/bloog/overridetree.cb b/src/mainboard/google/octopus/variants/bloog/overridetree.cb index 21a10f74c8..cf70bb3108 100644 --- a/src/mainboard/google/octopus/variants/bloog/overridetree.cb +++ b/src/mainboard/google/octopus/variants/bloog/overridetree.cb @@ -49,12 +49,32 @@ chip soc/intel/apollolake #| | required to set up a BAR | #| | for TPM communication | #| | before memory is up | + #| I2C5 | Audio | + #| I2C6 | Trackpad | + #| I2C7 | Touchscreen | #+-------------------+---------------------------+ register "common_soc_config" = "{ .gspi[0] = { .speed_mhz = 1, .early_init = 1, }, + .i2c[5] = { + .speed = I2C_SPEED_FAST, + .rise_time_ns = 104, + .fall_time_ns = 52, + }, + .i2c[6] = { + .speed = I2C_SPEED_FAST, + .rise_time_ns = 66, + .fall_time_ns = 90, + .data_hold_time_ns = 350, + }, + .i2c[7] = { + .speed = I2C_SPEED_FAST, + .rise_time_ns = 44, + .fall_time_ns = 90, + }, + }" device domain 0 on -- cgit v1.2.3