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cheza: Lower the I2C speeds on TCPC buses to 400kHz

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The initial I2C operating speed of the port-0 TCPC chip is 400kHz.
It requires changing a register addr:0x48 to a value 0x03 to increase
its speed to 1MHz.

The BC1.2 chips on port-0 and port-1 also operate at 400kHz, according
to the datasheet.

So lower the I2C speeds on two TCPC buses to 400kHz.

BRANCH=none
BUG=b:78142256
TEST=Use console to enable TPCP power and check I2C communication:
> gpioset EN_USB_C0_TCPC_PWR 1
> gpioset USB_C0_PD_RST_R_L 1
> i2cscan 1
Scanning 1 tcpc0......................................
0x4a...
0x50........................
0x80...............................................................
> i2cxfer r 1 0x50 0x00
0xaa [170]

Change-Id: I665136d738de50db8beeed338e3102fb5ca6fc84
Signed-off-by: Wai-Hong Tam <waihong@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1015763
Reviewed-by: Alexandru M Stan <amstan@chromium.org>
This commit is contained in:
Wai-Hong Tam
2018-04-17 09:57:11 -07:00
committed by chrome-bot
parent 8f1657aa39
commit b21f335c40
1 changed files with 2 additions and 2 deletions
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4
board/cheza/board.c
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@@ -35,8 +35,8 @@ const struct adc_t adc_channels[] = {};
/* I2C port map */
const struct i2c_port_t i2c_ports[] = {
{"power", I2C_PORT_POWER, 400, GPIO_I2C0_SCL, GPIO_I2C0_SDA},
{"tcpc0", I2C_PORT_TCPC0, 1000, GPIO_I2C1_SCL, GPIO_I2C1_SDA},
{"tcpc1", I2C_PORT_TCPC1, 1000, GPIO_I2C2_SCL, GPIO_I2C2_SDA},
{"tcpc0", I2C_PORT_TCPC0, 400, GPIO_I2C1_SCL, GPIO_I2C1_SDA},
{"tcpc1", I2C_PORT_TCPC1, 400, GPIO_I2C2_SCL, GPIO_I2C2_SDA},
{"eeprom", I2C_PORT_EEPROM, 400, GPIO_I2C5_SCL, GPIO_I2C5_SDA},
{"sensor", I2C_PORT_SENSOR, 400, GPIO_I2C7_SCL, GPIO_I2C7_SDA},
};