How to reset I2C

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi.

I want to reset I2C1.
But I2C1 reset register writing was generating serror(system error).
I2C1 reset register(CLK_RST_CONTROLLER_RST_DEV_I2C1_0) reading was ok.
Referring to uboot source code, It seems to be reset indirectly through bpmp.
How can I set directly reset register ?

2

hello HYLEE,

there’s 3rdparty i2c tools for you to access the register.
please have a try.
thanks

3

Thank you for reply.

I am porting new rtos.
So, I can’t use 3rdparty i2c tools.
I want to configurate clock and reset registers on system booting state.

How can I set directly reset clock and reset registers?

4

hello HYLEE,

please try to set register directly via kernel functions,
please refer to below, thanks

sources/kernel/kernel-4.4/drivers/i2c/i2c-core.c

/**
 * i2c_smbus_write_byte - SMBus "send byte" protocol
 * @client: Handle to slave device
 * @value: Byte to be sent
 *
 * This executes the SMBus "send byte" protocol, returning negative errno
 * else zero on success.
*/
 s32 i2c_smbus_write_byte(const struct i2c_client *client, u8 value)
 {
         return i2c_smbus_xfer(client->adapter, client->addr, client->flags,
                               I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
 }