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-rw-r--r--src/mainboard/google/reef/variants/snappy/devicetree.cb37
1 files changed, 35 insertions, 2 deletions
diff --git a/src/mainboard/google/reef/variants/snappy/devicetree.cb b/src/mainboard/google/reef/variants/snappy/devicetree.cb
index b024682aae..e46483e3b0 100644
--- a/src/mainboard/google/reef/variants/snappy/devicetree.cb
+++ b/src/mainboard/google/reef/variants/snappy/devicetree.cb
@@ -71,8 +71,41 @@ chip soc/intel/apollolake
register "gpe0_dw2" = "PMC_GPE_N_63_32"
register "gpe0_dw3" = "PMC_GPE_SW_31_0"
- # Enable I2C2 bus early for TPM access
- register "i2c[2].early_init" = "1"
+ # Enable I2C0 for audio codec at 400kHz
+ register "i2c[0]" = "{
+ .speed = I2C_SPEED_FAST,
+ .rise_time_ns = 44,
+ .fall_time_ns = 22,
+ }"
+
+ # Enable I2C2 bus early for TPM at 400kHz
+ register "i2c[2]" = "{
+ .early_init = 1,
+ .speed = I2C_SPEED_FAST,
+ .rise_time_ns = 40,
+ .fall_time_ns = 20,
+ }"
+
+ # touchscreen at 400kHz
+ register "i2c[3]" = "{
+ .speed = I2C_SPEED_FAST,
+ .rise_time_ns = 70,
+ .fall_time_ns = 164,
+ }"
+
+ # trackpad at 400kHz
+ register "i2c[4]" = "{
+ .speed = I2C_SPEED_FAST,
+ .rise_time_ns = 20,
+ .fall_time_ns = 164,
+ }"
+
+ # digitizer at 400kHz
+ register "i2c[5]" = "{
+ .speed = I2C_SPEED_FAST,
+ .rise_time_ns = 152,
+ .fall_time_ns = 30,
+ }"
# Minimum SLP S3 assertion width 28ms.
register "slp_s3_assertion_width_usecs" = "28000"