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| author | Keith Short <keithshort@chromium.org> | 2021-09-16 14:49:11 -0600 |
|---|---|---|
| committer | Commit Bot <commit-bot@chromium.org> | 2021-09-17 19:03:14 +0000 |
| commit | c6be277af16926c2f780f84e1a307f2751814570 (patch) | |
| tree | 7a0b82fc116a3961c8bd99c61fc0bd58e803360c | |
| parent | abc448dfbb68b8b94fbfaf1e8193d44b44cf1107 (diff) | |
| download | chrome-ec-c6be277af16926c2f780f84e1a307f2751814570.tar.gz | |
zephyr: herobrine_npcx9: Set TCPC I2C speed to 400 kHz
The PS8805 supports 1 MHz operation normally, but only 400 kHz operation
during flash updates. The I2C passthru interface used by depthcharge
doesn't support changing the I2C frequency or informing the EC that a
firmware update is going to start, so the lower frequency must be used.
BUG=b:199550987
BRANCH=none
TEST=Verify PS8805-A3 firmware updates
Signed-off-by: Keith Short <keithshort@chromium.org>
Change-Id: I9be242ce03cc29c74559c6012b5cc83680b7b288
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3166998
Reviewed-by: Wai-Hong Tam <waihong@google.com>
| -rw-r--r-- | zephyr/projects/herobrine/herobrine_npcx9/i2c.dts | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/zephyr/projects/herobrine/herobrine_npcx9/i2c.dts b/zephyr/projects/herobrine/herobrine_npcx9/i2c.dts index 97b6f0661d..8e26fae393 100644 --- a/zephyr/projects/herobrine/herobrine_npcx9/i2c.dts +++ b/zephyr/projects/herobrine/herobrine_npcx9/i2c.dts @@ -86,12 +86,22 @@ &i2c1_0 { status = "okay"; - clock-frequency = <I2C_BITRATE_FAST_PLUS>; + /* + * TODO(b/200280341): PS8805 SPI ROM access + * + * The PS8805 supports 1 MHz during normal operation, but only + * 400 Khz during firmware updates. The I2C passthru commands don't + * currently support changing the I2C frequency or notifying the EC + * that a programming operation is going to start. Lower the clock + * rate to 400 kHz for all accesses. + */ + clock-frequency = <I2C_BITRATE_FAST>; }; &i2c2_0 { status = "okay"; - clock-frequency = <I2C_BITRATE_FAST_PLUS>; + /* TODO(b/200280341): PS8805 SPI ROM access */ + clock-frequency = <I2C_BITRATE_FAST>; }; &i2c3_0 { |