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mb/google/brya/variants/felwinter: Adjust I2Cs CLK to be around 400 kHz 

Need to tune I2C bus 0/1/3/5 clock frequency under the 400kHz for
audio, TPM, touchscreen, and touchpad.

Audio CLK: 385 kHz
TPM CLK: 380.5 kHz
Touch Screen CLK: 373.3 kHz
Touch Pad CLK: 372.7 kHz

BUG=b:218577918
BRANCH=master
TEST=emerge-brya coreboot chromeos-bootimage
     measure by scope with felwinter.

Signed-off-by: John Su <john_su@compal.corp-partner.google.com>
Change-Id: I3e5cc10d6605f9cc41fa6b31da07a81364b72fe0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62009
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
This commit is contained in:
John Su 2022-02-16 14:59:07 +08:00 committed by Felix Held
parent aa41f77397
commit bf81c24e07
1 changed files with 12 additions and 0 deletions
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12
src/mainboard/google/brya/variants/felwinter/overridetree.cb
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@ -58,16 +58,28 @@ chip soc/intel/alderlake
register "common_soc_config" = "{
.i2c[0] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 550,
.fall_time_ns = 400,
.data_hold_time_ns = 50,
},
.i2c[1] = {
.early_init = 1,
.speed = I2C_SPEED_FAST,
.rise_time_ns = 550,
.fall_time_ns = 400,
.data_hold_time_ns = 50,
},
.i2c[3] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 550,
.fall_time_ns = 400,
.data_hold_time_ns = 50,
},
.i2c[5] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 550,
.fall_time_ns = 400,
.data_hold_time_ns = 50,
},
}"