Sony CXD5602 User Manual page 217

3.7.3.3 Clock Supply Start and Stop
3.7.3.3.1 Clock Supply Start
The following describes the method to start clock supply to the I2C2.
1. Clock supply start of the AHB/APB Bus Bridge.
SYSIOP_SUB_CKEN.COM_BRG = 1'b1
SYSIOP_SUB_CKEN.AHB_BRG_COMIF = 1'b1
2. Clock supply start (internal circuit initialization).
SYSIOP_SUB_CKEN.I2CM_SUB = 1'b1
Reads the address 0x041AA000 of I2C2 (dummy read to wait for completion of preceding setting)
3. Clock stop
SYSIOP_SUB_CKEN.I2CM_SUB = 1'b0
Reads the address 0x041AA000 of I2C2 (dummy read to wait for completion of preceding setting)
4. Reset release
SWRESET_BUS.XRST_I2CM_SUB = 1'b1
5. Clock supply start
SYSIOP_SUB_CKEN.I2CM_SUB = 1'b1
3.7.3.3.2 Clock Supply Stop
The following describes the method to stop the clock supply to the I2C2.
1. Clock stop
SYSIOP_SUB_CKEN.I2CM_SUB = 1'b0
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CXD5602 User Manual