mainboard/google/fizz: Tune audio i2c parameters
Tune I2C params for I2C bus 5 to ensure that the frequency does not
exceed 400KHz.
BUG=b:65058277
BRANCH=None
TEST=Measured bus frequency for audio <= 400MHz
Change-Id: I18bca023a6a0fe21e6f46f8688264d3c04d77f25
Signed-off-by: Shelley Chen <shchen@chromium.org>
Reviewed-on: https://review.coreboot.org/23359
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/mainboard/google/fizz/devicetree.cb b/src/mainboard/google/fizz/devicetree.cb
index 81b5dc5..8cf4e52 100644
--- a/src/mainboard/google/fizz/devicetree.cb
+++ b/src/mainboard/google/fizz/devicetree.cb
@@ -247,6 +247,17 @@
.early_init = 1,
}"
+ # audio
+ register "i2c[5]" = "{
+ .speed = I2C_SPEED_FAST,
+ .speed_config[0] = {
+ .speed = I2C_SPEED_FAST,
+ .scl_lcnt = 194,
+ .scl_hcnt = 100,
+ .sda_hold = 36,
+ },
+ }"
+
# Must leave UART0 enabled or SD/eMMC will not work as PCI
register "SerialIoDevMode" = "{
[PchSerialIoIndexI2C0] = PchSerialIoDisabled,