From 30fba61502f6cc19c846fa4a219b65823bfd6728 Mon Sep 17 00:00:00 2001 From: "stanley.wu" Date: Wed, 1 Sep 2021 11:03:07 +0800 Subject: mb/google/dedede/var/gooey: Configure I2C times for I2C devices Configure I2C high / low time in device tree to ensure I2C CLK runs under I2C_SPEED_FAST (400 kHz). Measured I2C frequency just as below after tuning: Touchpad: 386.7kHz Touchscreen: 387.4kHz Audio: 385.7kHz P-sensor: 378.1kHz BaUG=b:197247706 BRANCH=dedede TEST=Build and check I2C clock is under 400kHz Signed-off-by: stanley.wu Change-Id: Ic5d5660181f36f161ae04cbf5003f6d7ad4bc16f Reviewed-on: https://review.coreboot.org/c/coreboot/+/57297 Tested-by: build bot (Jenkins) Reviewed-by: Henry Sun Reviewed-by: Paul Menzel Reviewed-by: Karthik Ramasubramanian --- src/mainboard/google/dedede/variants/gooey/overridetree.cb | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'src') diff --git a/src/mainboard/google/dedede/variants/gooey/overridetree.cb b/src/mainboard/google/dedede/variants/gooey/overridetree.cb index 9b291fbf4f..ab0e410adb 100644 --- a/src/mainboard/google/dedede/variants/gooey/overridetree.cb +++ b/src/mainboard/google/dedede/variants/gooey/overridetree.cb @@ -13,18 +13,26 @@ chip soc/intel/jasperlake register "common_soc_config" = "{ .i2c[0] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 212, + .fall_time_ns = 38, }, .i2c[1] = { .speed = I2C_SPEED_FAST, }, .i2c[2] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 212, + .fall_time_ns = 38, }, .i2c[4] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 212, + .fall_time_ns = 38, }, .i2c[5] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 212, + .fall_time_ns = 38, }, }" -- cgit v1.2.3