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

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

Measured I2C frequency just as below after tuning:
touchpad:371.63 kHz
touchpanel:368.24 kHz
audio codec RT5682:369.13 kHz
speaker AMP L:366.21 kHz
speaker AMP R:365.8 kHz
P-sensor:368.34 kHz
MIPI Camera:363.35 kHz

BUG=b:181589325
BRANCH=dedede
TEST=Build and check after tuning I2C clock is under 400kHz

Signed-off-by: Tao Xia <xiatao5@huaqin.corp-partner.google.com>
Change-Id: I1a755a54540e106b41ac427f84989ed7e8037558
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51624
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Tao Xia 2021-03-18 16:18:06 +08:00 committed by Patrick Georgi
parent 2fa96eb33e
commit fd952aaa50
1 changed files with 10 additions and 0 deletions
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10
src/mainboard/google/dedede/variants/storo/overridetree.cb
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@ -26,21 +26,31 @@ chip soc/intel/jasperlake
},
.i2c[0] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 125,
.fall_time_ns = 19,
},
.i2c[1] = {
.speed = I2C_SPEED_FAST,
},
.i2c[2] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 86,
.fall_time_ns = 5,
},
.i2c[3] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 84,
.fall_time_ns = 4,
},
.i2c[4] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 69,
.fall_time_ns = 3,
},
.i2c[5] = {
.speed = I2C_SPEED_FAST,
.rise_time_ns = 129,
.fall_time_ns = 4,
},
}"