diff options
| author | Philip Chen <philipchen@google.com> | 2019-07-24 14:35:44 -0700 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2019-08-02 15:43:10 +0000 |
| commit | b7ec252d378deee1d07175c8fdc8d2302f7fbcef (patch) | |
| tree | c00b746400d6bc04c58d242e15acd7a86ebea210 /src/mainboard | |
| parent | 43d07f75cf001b49422470ba63ea1d0afb049ea4 (diff) | |
mb/google/hatch: Fine-tune Kohaku I2C CLK frequency
Add rise time / fall time to I2C config in device tree to ensure I2C
CLK runs accurately at I2C_SPEED_FAST (400 kHz).
BUG=b:138258384
BRANCH=none
TEST=probe I2C0/I2C2/I2C3 SCL on Kohaku board, verify all of them run
at 395-399 kHz.
Change-Id: Id98079e717f0db3fdcb88f85e45693925d11d7fd
Signed-off-by: Philip Chen <philipchen@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34559
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/mainboard')
| -rw-r--r-- | src/mainboard/google/hatch/variants/kohaku/overridetree.cb | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/mainboard/google/hatch/variants/kohaku/overridetree.cb b/src/mainboard/google/hatch/variants/kohaku/overridetree.cb index fa64d60483..b3ae1bc240 100644 --- a/src/mainboard/google/hatch/variants/kohaku/overridetree.cb +++ b/src/mainboard/google/hatch/variants/kohaku/overridetree.cb @@ -32,15 +32,21 @@ chip soc/intel/cannonlake register "common_soc_config" = "{ .i2c[0] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 135, + .fall_time_ns = 45, }, .i2c[1] = { .speed = I2C_SPEED_FAST, }, .i2c[2] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 95, + .fall_time_ns = 55, }, .i2c[4] = { .speed = I2C_SPEED_FAST, + .rise_time_ns = 100, + .fall_time_ns = 20, }, .gspi[0] = { .speed_mhz = 1, |