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I2C

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Lee Lup Yuen 2023-10-28 17:09:54 +08:00
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@ -7901,10 +7901,10 @@ clk u5_dw_i2c_clk_apb already disabled
# Explore the I2C Controller for Star64 JH7110 # 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) (Looks garbled)
JH7110 I2C is based on [DesignWare I2C](https://github.com/torvalds/linux/blob/master/drivers/i2c/busses/i2c-designware-core.h) JH7110 I2C is based on [DesignWare I2C](https://github.com/torvalds/linux/blob/master/drivers/i2c/busses/i2c-designware-core.h)
_How do we send data over JH7110 I2C?_
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" 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 ```text
@ -7966,9 +7966,7 @@ Which is implemented by this NuttX Driver:
- Bit Bang Version: [cxd56_i2c_bitbang.c](https://github.com/apache/nuttx/blob/master/arch/arm/src/cxd56xx/cxd56_i2c_bitbang.c) and [cxd56_i2c_bitbang.h](https://github.com/apache/nuttx/blob/master/arch/arm/src/cxd56xx/cxd56_i2c_bitbang.h) - Bit Bang Version: [cxd56_i2c_bitbang.c](https://github.com/apache/nuttx/blob/master/arch/arm/src/cxd56xx/cxd56_i2c_bitbang.c) and [cxd56_i2c_bitbang.h](https://github.com/apache/nuttx/blob/master/arch/arm/src/cxd56xx/cxd56_i2c_bitbang.h)
TODO: Test this with U-Boot Let's test this with U-Boot! We read the I2C Registers 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: From [DesignWare DW_apb_i2c Databook](https://github.com/lupyuen/nuttx-star64/blob/main/designware-apb-i2c.pdf) Page 154:
@ -8018,7 +8016,7 @@ From [DesignWare DW_apb_i2c Databook](https://github.com/lupyuen/nuttx-star64/bl
Actual Value: 0 Actual Value: 0
The above Actual Values were retrieved from U-Boot... The above Actual Values were retrieved from I2C Port 0 via U-Boot...
```bash ```bash
## Omitted: Power Up the I2C Controller ## Omitted: Power Up the I2C Controller
@ -8045,7 +8043,9 @@ $ md 0x10030000 0x40
TODO: Read PMIC with U-Boot TODO: Read PMIC with U-Boot
TODO: Which I2C ports are in use? _Which I2C ports are in use?_
Let's dump the I2C Registers for I2C Ports 1 to 6...
```bash ```bash
## Omitted: Power Up the I2C Controller ## Omitted: Power Up the I2C Controller
@ -8165,17 +8165,17 @@ $ md 0x12060000 0x40
120600f0: 00000000 001f1fee 3230302a 44570140 ........*002@.WD 120600f0: 00000000 001f1fee 3230302a 44570140 ........*002@.WD
``` ```
TODO: I2C Port 5 has I2C Target Address 0x50. Probably in use I2C Port 5 has I2C Target Address 0x50. Probably in use.
TODO: What are the I2C Controller Registers? TODO: What are the I2C Controller Registers?
TODO: What is I2C Target Address 0x50? TODO: What is I2C Target Address 0x50? It's not AXP15060 PMIC, which has I2C Address 0x36 [(Page 7)](https://files.pine64.org/doc/datasheet/star64/AXP15060%20datasheet%20V0.1.pdf)
Not AXP15060 PMIC, which has I2C Address 0x36 [(Page 7)](https://files.pine64.org/doc/datasheet/star64/AXP15060%20datasheet%20V0.1.pdf)
TODO: Check the U-Boot Device Tree TODO: Check the U-Boot Device Tree
TODO: [OpenSBI PMIC Driver](https://github.com/starfive-tech/opensbi/blob/JH7110_VisionFive2_devel/platform/generic/starfive/jh7110.c) TODO: Read the PMIC over I2C with U-Boot. Refer to [OpenSBI PMIC Driver](https://github.com/starfive-tech/opensbi/blob/JH7110_VisionFive2_devel/platform/generic/starfive/jh7110.c)
FYI: When we search the JH7110 Docs for "I2C", this garbled page appears, not linked in any section: [I2C Register Description](https://doc-en.rvspace.org/JH7110/TRM/JH7110_TRM/register_descript_i2c.html)
# Call OpenSBI from NuttX # Call OpenSBI from NuttX