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UPSTREAM: google/pyro: set i2c bus timings by rise/fall times

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Provide the rise and fall times for the i2c buses and let the
library perform the necessary calculations for the i2c
controller registers instead of manually tuning the values.

BUG=chrome-os-partner:58112
BRANCH=master
TEST=emerge-pyro coreboot
Signed-off-by: Kevin Chiu <Kevin.Chiu@quantatw.com>
Reviewed-on: https://review.coreboot.org/17652
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

Change-Id: I68be9b96dc731eb0084ee5e15921866818637e73
Reviewed-on: https://chromium-review.googlesource.com/416166
Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Kevin Chiu 2016-11-30 16:30:28 +08:00 • committed by chrome-bot
parent 34d5165c90
commit f6c4a544a0
1 changed files with 12 additions and 29 deletions
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41
src/mainboard/google/reef/variants/pyro/devicetree.cb
View file

@ -71,50 +71,33 @@ chip soc/intel/apollolake
register "gpe0_dw2" = "PMC_GPE_N_63_32"
register "gpe0_dw3" = "PMC_GPE_SW_31_0"
# Limit I2C0 Audio codec da7219 speed to 400kHz with manually tuned values.
# Enable I2C0 for audio codec at 400kHz
register "i2c[0]" = "{
.speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 0xd0,
.scl_hcnt = 0x68,
.sda_hold = 0x27,
}
.rise_time_ns = 104,
.fall_time_ns = 52,
}"
# Enable I2C2 bus early for TPM access and configure as 400kHz
# with manually tuned values.
# Enable I2C2 bus early for TPM at 400kHz
register "i2c[2]" = "{
.early_init = 1,
.speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 0xd0,
.scl_hcnt = 0x68,
.sda_hold = 0x27,
}
.rise_time_ns = 50,
.fall_time_ns = 23,
}"
# Limit I2C3 WACOM touchscreen speed to 400kHz with manually tuned values.
# touchscreen at 400kHz
register "i2c[3]" = "{
.speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 0xd0,
.scl_hcnt = 0x68,
.sda_hold = 0x27,
}
.rise_time_ns = 76,
.fall_time_ns = 164,
}"
# Limit trackpad speed to 400kHz with manually tuned values.
# trackpad at 400kHz
register "i2c[4]" = "{
.speed = I2C_SPEED_FAST,
.speed_config[0] = {
.speed = I2C_SPEED_FAST,
.scl_lcnt = 0xd0,
.scl_hcnt = 0x68,
.sda_hold = 0x27,
}
.rise_time_ns = 90,
.fall_time_ns = 164,
}"
# Minimum SLP S3 assertion width 28ms.