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Explore I2C

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Lee Lup Yuen 2023-10-19 10:24:46 +08:00
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@ -7883,13 +7883,11 @@ clk u5_dw_i2c_clk_apb already disabled
# Explore the I2C Controller for Star64 JH7110
TODO: Not linked in any section, appears when we search for "I2C": [I2C Register Description](https://doc-en.rvspace.org/JH7110/TRM/JH7110_TRM/register_descript_i2c.html)
TODO: Not linked in any section, appears when we search for "I2C": [I2C Register Description](https://doc-en.rvspace.org/JH7110/TRM/JH7110_TRM/register_descript_i2c.html) (Looks garbled)
JH7110 I2C is based on [DesignWare I2C](https://github.com/torvalds/linux/blob/master/drivers/i2c/busses/i2c-designware-core.h)
[DesignWare DW_apb_i2c Databook](https://github.com/lupyuen/nuttx-star64/blob/main/designware-apb-i2c.pdf)
See Page 252: "Figure 8-2: Flowchart for DW_apb_i2c Master"
From [DesignWare DW_apb_i2c Databook](https://github.com/lupyuen/nuttx-star64/blob/main/designware-apb-i2c.pdf) Page 252: "Figure 8-2: Flowchart for DW_apb_i2c Master"
```text
Write 0 to IC_ENABLE to disable DW_apb_i2c
@ -7954,6 +7952,24 @@ TODO: Test this with U-Boot
TODO: Read I2C Controller with U-Boot
From [DesignWare DW_apb_i2c Databook](https://github.com/lupyuen/nuttx-star64/blob/main/designware-apb-i2c.pdf) Page 154:
- IC_CON (Offset 0x00): I2C Control
- IC_ENABLE (Offset 0x6C): I2C Enable
- IC_STATUS (Offset 0x70): I2C Status register
- IC_COMP_VERSION (Offset 0xf8): Component Version ID
- IC_COMP_TYPE (Offset 0xfc): DesignWare Component Type Register
Reset Value: 0x44570140
- IC_DEVICE_ID (Offset 0xb8): I2C Device ID
Reset Value: IC_DEVICE_ID_VALUE
TODO: Read PMIC with U-Boot
# PineTab-V Factory Test Code