diff options
| author | Reka Norman <rekanorman@google.com> | 2022-04-08 15:14:35 +1000 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2022-04-13 15:10:33 +0000 |
| commit | 46694d8a46a8ecb109e9d10ad681615245041957 (patch) | |
| tree | 6841e4556778370235e5d03ef6245b4cb3608597 /src/mainboard/google/brya/variants | |
| parent | f478b1f464fdde28eae88b6e574a1ac0c3a1fe70 (diff) | |
mb/google/brya/baseboard/nissa: Configure I2C lcnt and hcnt
Configure lcnt and hcnt directly to give the required frequency, tHIGH
and tLOW, instead of using rise and fall times. Aim for a frequency of
390 kHz to make sure it doesn't exceed 400 kHz on different boards.
BUG=b:227517802
TEST=Probe the clock line and check that it meets the requirements for
frequency, tHIGH and tLOW.
Change-Id: I4d4f877c1f0cd9aacd3fa152890b7ef82e059f78
Signed-off-by: Reka Norman <rekanorman@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63562
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kangheui Won <khwon@chromium.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Diffstat (limited to 'src/mainboard/google/brya/variants')
| -rw-r--r-- | src/mainboard/google/brya/variants/baseboard/nissa/devicetree.cb | 30 |
1 files changed, 20 insertions, 10 deletions
diff --git a/src/mainboard/google/brya/variants/baseboard/nissa/devicetree.cb b/src/mainboard/google/brya/variants/baseboard/nissa/devicetree.cb index c4c4fb3c58..dfc0a85b41 100644 --- a/src/mainboard/google/brya/variants/baseboard/nissa/devicetree.cb +++ b/src/mainboard/google/brya/variants/baseboard/nissa/devicetree.cb @@ -74,33 +74,43 @@ chip soc/intel/alderlake .i2c[0] = { .early_init = 1, .speed = I2C_SPEED_FAST, - .rise_time_ns = 650, - .fall_time_ns = 400, .data_hold_time_ns = 50, + .speed_config[0] = { + .scl_lcnt = 157, + .scl_hcnt = 78, + } }, .i2c[1] = { .speed = I2C_SPEED_FAST, - .rise_time_ns = 650, - .fall_time_ns = 400, .data_hold_time_ns = 50, + .speed_config[0] = { + .scl_lcnt = 157, + .scl_hcnt = 78, + } }, .i2c[2] = { .speed = I2C_SPEED_FAST, - .rise_time_ns = 650, - .fall_time_ns = 400, .data_hold_time_ns = 50, + .speed_config[0] = { + .scl_lcnt = 157, + .scl_hcnt = 78, + } }, .i2c[3] = { .speed = I2C_SPEED_FAST, - .rise_time_ns = 650, - .fall_time_ns = 400, .data_hold_time_ns = 50, + .speed_config[0] = { + .scl_lcnt = 157, + .scl_hcnt = 78, + } }, .i2c[5] = { .speed = I2C_SPEED_FAST, - .rise_time_ns = 650, - .fall_time_ns = 400, .data_hold_time_ns = 50, + .speed_config[0] = { + .scl_lcnt = 157, + .scl_hcnt = 78, + } }, }" |