Change in coreboot[master]: mb/google/dedede/var/sasukette: Configure I2C times for touchpad/code...

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/51112 )

Change subject: mb/google/dedede/var/sasukette: Configure I2C times for touchpad/codec/AMP
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mb/google/dedede/var/sasukette: Configure I2C times for touchpad/codec/AMP

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:372 kHz
audio codec RT5682:386.8 kHz
speaker AMP L:387.5 kHz
speaker AMP R:388.9 kHz

BUG=b:181342340
BRANCH=dedede
TEST=Build and check after tuning I2C clock is under 400kHz

Signed-off-by: Tao Xia 
Change-Id: I05d78c088190e349281a34b2aeed39ae8d867dc2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51112
Reviewed-by: Karthik Ramasubramanian 
Reviewed-by: Paul Menzel 
Tested-by: build bot (Jenkins) 
---
M src/mainboard/google/dedede/variants/sasukette/overridetree.cb
1 file changed, 12 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Paul Menzel: Looks good to me, but someone else must approve
  Karthik Ramasubramanian: Looks good to me, approved

diff --git a/src/mainboard/google/dedede/variants/sasukette/overridetree.cb b/src/mainboard/google/dedede/variants/sasukette/overridetree.cb
index 2b310ce..fe7a2dd 100644
--- a/src/mainboard/google/dedede/variants/sasukette/overridetree.cb
+++ b/src/mainboard/google/dedede/variants/sasukette/overridetree.cb
@@ -21,6 +21,12 @@
    	},
    	.i2c[0] = {
    		.speed = I2C_SPEED_FAST,
+			.speed_config[0] = {
+				.speed = I2C_SPEED_FAST,
+				.scl_lcnt = 185,
+				.scl_hcnt = 95,
+				.sda_hold = 40,
+			}
    	},
    	.i2c[1] = {
    		.speed = I2C_SPEED_FAST,
@@ -33,6 +39,12 @@
    	},
    	.i2c[4] = {
    		.speed = I2C_SPEED_FAST,
+			.speed_config[0] = {
+				.speed = I2C_SPEED_FAST,
+				.scl_lcnt = 185,
+				.scl_hcnt = 95,
+				.sda_hold = 40,
+			}
    	},
    }"