drivers: i2c: Add I2C driver of it51xxx

[GTLin08]

Implement the functions of I2C host and target.
I2CM: supports nine hosts and each one able located at I2C interface 0-12.
supports two 32 bytes dedicated FIFO mode for read and write.

I2CS: supports three targets and each one able located at I2C interface 0-8.
supports 16 bytes dedicated FIFO mode that only supports write or read mode and the maximum buffer size is 256 bytes.
support non-FIFO write to shared FIFO read mode. The maximum shared FIFO size for read is 256 bytes.

The APIs test include: i2c_write(), i2c_read(), i2c_burst_read(), i2c_burst_write(), i2c_write_read()

[GTLin08]

Rebased.

[Copilot]

Pull Request Overview

This PR adds a new I2C driver for the it51xxx SoC, implementing both host and target functionality with dedicated FIFO modes and expanded channel support.

• Introduces additional hardware configuration in soc.c to disable debug hardware target detection.
• Adds SMBus register definitions in chip_chipregs.h and updates related DTS bindings and header files for channel and interface configuration.
• Updates board configuration to enable I2C support.

Reviewed Changes

Copilot reviewed 7 out of 15 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
soc/ite/ec/it51xxx/soc.c	Adds debug disable commands for hardware target detection.
soc/ite/ec/it51xxx/chip_chipregs.h	Defines SMBus interface registers with new register offsets.
include/zephyr/dt-bindings/i2c/it51xxx-i2c.h	Introduces new DT bindings constants for I2C interfaces.
include/zephyr/dt-bindings/i2c/i2c.h	Adds additional SMBus channel definitions.
dts/bindings/i2c/ite,it51xxx-i2c.yaml	Provides detailed configuration examples for the new driver.
boards/ite/it515xx_evb/it515xx_evb.yaml	Updates the board configuration to include I2C support.

Files not reviewed (8)

• boards/ite/it515xx_evb/it515xx_evb.dts: Language not supported
• drivers/i2c/CMakeLists.txt: Language not supported
• drivers/i2c/Kconfig: Language not supported
• drivers/i2c/Kconfig.it51xxx: Language not supported
• dts/riscv/ite/it51xxx-pinctrl-map.dtsi: Language not supported
• dts/riscv/ite/it51xxx.dtsi: Language not supported
• tests/drivers/i2c/i2c_target_api/boards/it515xx_evb.conf: Language not supported
• tests/drivers/i2c/i2c_target_api/boards/it515xx_evb.overlay: Language not supported

[Copilot]

Consider adding parentheses around the arithmetic expression to ensure proper evaluation (e.g., ((IT51XXX_SMB_BASE) + 0x0a)). This change applies to all similar macro definitions.

Suggested change

	#define SMB_SADFPCTL IT51XXX_SMB_BASE + 0x0a
	#define SMB_SBDFPCTL IT51XXX_SMB_BASE + 0x2a
	#define SMB_SCDFPCTL IT51XXX_SMB_BASE + 0x4a
	#define SMB_SADFPCTL (IT51XXX_SMB_BASE + 0x0a)
	#define SMB_SBDFPCTL (IT51XXX_SMB_BASE + 0x2a)
	#define SMB_SCDFPCTL (IT51XXX_SMB_BASE + 0x4a)

[kartben]

This is rule 20.7 of the coding guidelines and should be addressed

[GTLin08]

Done.

[Copilot]

There is a spelling mistake: 'Swich' should be corrected to 'Switch'.

Suggested change

	1 = SMB_SWITCH_INTERFACE0: Swich to interface0 SMCLK0/SMDAT0
	2 = SMB_SWITCH_INTERFACE1: Swich to interface1 SMCLK1/SMDAT1
	3 = SMB_SWITCH_INTERFACE2: Swich to interface2 SMCLK2/SMDAT2
	4 = SMB_SWITCH_INTERFACE3: Swich to interface3 SMCLK3/SMDAT3
	5 = SMB_SWITCH_INTERFACE4: Swich to interface4 SMCLK4/SMDAT4
	6 = SMB_SWITCH_INTERFACE5: Swich to interface5 SMCLK5/SMDAT5
	7 = SMB_SWITCH_INTERFACE6: Swich to interface6 SMCLK6/SMDAT6
	8 = SMB_SWITCH_INTERFACE7: Swich to interface7 SMCLK7/SMDAT7
	9 = SMB_SWITCH_INTERFACE8: Swich to interface8 SMCLK8/SMDAT8
	10 = SMB_SWITCH_INTERFACE9: Swich to interface9 SMCLK9/SMDAT9
	11 = SMB_SWITCH_INTERFACE10: Swich to interface10 SMCLK10/SMDAT10
	12 = SMB_SWITCH_INTERFACE11: Swich to interface11 SMCLK11/SMDAT11
	13 = SMB_SWITCH_INTERFACE12: Swich to interface12 SMCLK12/SMDAT12
	1 = SMB_SWITCH_INTERFACE0: Switch to interface0 SMCLK0/SMDAT0
	2 = SMB_SWITCH_INTERFACE1: Switch to interface1 SMCLK1/SMDAT1
	3 = SMB_SWITCH_INTERFACE2: Switch to interface2 SMCLK2/SMDAT2
	4 = SMB_SWITCH_INTERFACE3: Switch to interface3 SMCLK3/SMDAT3
	5 = SMB_SWITCH_INTERFACE4: Switch to interface4 SMCLK4/SMDAT4
	6 = SMB_SWITCH_INTERFACE5: Switch to interface5 SMCLK5/SMDAT5
	7 = SMB_SWITCH_INTERFACE6: Switch to interface6 SMCLK6/SMDAT6
	8 = SMB_SWITCH_INTERFACE7: Switch to interface7 SMCLK7/SMDAT7
	9 = SMB_SWITCH_INTERFACE8: Switch to interface8 SMCLK8/SMDAT8
	10 = SMB_SWITCH_INTERFACE9: Switch to interface9 SMCLK9/SMDAT9
	11 = SMB_SWITCH_INTERFACE10: Switch to interface10 SMCLK10/SMDAT10
	12 = SMB_SWITCH_INTERFACE11: Switch to interface11 SMCLK11/SMDAT11
	13 = SMB_SWITCH_INTERFACE12: Switch to interface12 SMCLK12/SMDAT12

[GTLin08]

Done.

[kartben]

Coding guidelines issue pointed out by Copilot should be addressed. Thanks!

[GTLin08]

Hi @teburd, @Dino-Li, @kartben,
I’ve made changes based on Copilot’s requests. Please revisit the updated PR. Thanks!

feedback addressed - thx!

[GTLin08]

Hi @Dino-Li ,

Rebased and fixed the issue as described below:

While working with I2C3, we discovered an issue in the previous PR where the reg property was incorrectly defined as

i2c3: i2c@f04178 {
     reg = <0x00f04178 0x0028>;
}

This should be:

i2c3: i2c@f04178 {
     reg = <0x00f04178 0x0028
            0 1>;
}

I've corrected this in the latest update.

[GTLin08]

Hi @teburd ,

Any comments would be greatly appreciated.

[teburd]

lgtm, reapproving