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mb/google/dedede/var/gooey: Configure I2C times for I2C devices 

Configure I2C high / low time in device tree to ensure I2C
CLK runs under I2C_SPEED_FAST (400 kHz).

Measured I2C frequency just as below after tuning:
Touchpad:	386.7kHz
Touchscreen:	387.4kHz
Audio:		385.7kHz
P-sensor:       378.1kHz

BaUG=b:197247706
BRANCH=dedede
TEST=Build and check I2C clock is under 400kHz

Signed-off-by: stanley.wu <stanley1.wu@lcfc.corp-partner.google.com>
Change-Id: Ic5d5660181f36f161ae04cbf5003f6d7ad4bc16f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57297
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Henry Sun <henrysun@google.com>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
This commit is contained in:
stanley.wu 2021-09-01 11:03:07 +08:00 committed by Felix Held
parent 1393831856
commit 30fba61502
1 changed files with 8 additions and 0 deletions
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8
src/mainboard/google/dedede/variants/gooey/overridetree.cb
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@ -13,18 +13,26 @@ chip soc/intel/jasperlake
register "common_soc_config" = "{
.i2c[0] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 212,
.fall_time_ns = 38,
},
.i2c[1] = {
.speed = I2C_SPEED_FAST,
},
.i2c[2] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 212,
.fall_time_ns = 38,
},
.i2c[4] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 212,
.fall_time_ns = 38,
},
.i2c[5] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 212,
.fall_time_ns = 38,
},
}"