ite,enhance-i2c
Vendor: ITE Tech. Inc.
Note
An implementation of a driver matching this compatible is available in drivers/i2c/i2c_ite_enhance.c.
Description
These nodes are “i2c” bus nodes.
ITE enhance I2C
Properties
Node specific properties
Properties not inherited from the base binding file.
Name |
Type |
Details |
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This option is used to configure the I2C speed prescaler for
the SCL low period. When set to >= 1, it will increase the
low period of the SCL clock and so reduce the signal frequency.
The resulting SCL cycle time is given by the following formula:
SCL cycle = 2 * (psr + prescale_tweak + 2) *
SMBus clock cycle
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This option is used to configure the data hold time of the I2C.
The unit is number of SMB clock cycles. The time calculation
is (data-hold-time / smb_clk) seconds.
Default value: Legal values: |
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This option is used when the I2C target is enabled. It is
necessary to prevent the target port from being configured
with I2C host related initialization.
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This option is used when the I2C target is enabled and it can
support PIO mode for I2C target transfer.
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Ordinal identifying the port 0 = SMB_CHANNEL_A, 1 = SMB_CHANNEL_B, 2 = SMB_CHANNEL_C, 3 = I2C_CHANNEL_D, 4 = I2C_CHANNEL_E, 5 = I2C_CHANNEL_F,
This property is required. Legal values: |
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The default setting is as described below
0 = I2C_CHA_LOCATE: Channel A is located at SMCLK0/SMDAT0
1 = I2C_CHB_LOCATE: Channel B is located at SMCLK1/SMDAT1
2 = I2C_CHC_LOCATE: Channel C is located at SMCLK2/SMDAT2
3 = I2C_CHD_LOCATE: Channel D is located at SMCLK3/SMDAT3
4 = I2C_CHE_LOCATE: Channel E is located at SMCLK4/SMDAT4
5 = I2C_CHF_LOCATE: Channel F is located at SMCLK5/SMDAT5
The following is an example of the 'channel-switch-sel' property
being swapped between node &i2c0 and &i2c2 in the application:
Note: The property of 'port-num' cannot be changed in the
application.
Channel C is located at SMCLK0/SMDAT0:
&i2c0 {
channel-switch-sel = <I2C_CHC_LOCATE>;
pinctrl-0 = <&i2c2_clk_gpf6_default
&i2c2_data_gpf7_default>;
pinctrl-names = "default";
scl-gpios = <&gpiof 6 0>;
sda-gpios = <&gpiof 7 0>;
};
Channel A is located at SMCLK2/SMDAT2:
&i2c2 {
channel-switch-sel = <I2C_CHA_LOCATE>;
pinctrl-0 = <&i2c0_clk_gpb3_default
&i2c0_data_gpb4_default>;
pinctrl-names = "default";
scl-gpios = <&gpiob 3 0>;
sda-gpios = <&gpiob 4 0>;
};
If the property of 'channel-switch-sel' is changed, the pinctrl
setting and recovery pin in &i2c0 and &i2c2 nodes must also be
modified accordingly.
This property is required. Legal values: |
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The SCL pin for the selected port.
This property is required. |
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The SDA pin for the selected port.
This property is required. |
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The clock gate offsets combine the register offset from
ECPM_BASE and the mask within that register into one value.
This property is required. |
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Maximum time allowed for an I2C transfer.
Default value: |
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Pin configuration/s for the first state. Content is specific to the
selected pin controller driver implementation.
This property is required. |
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Names for the provided states. The number of names needs to match the
number of states.
This property is required. |
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This property is enabled when selecting the push-pull GPIO output
type to drive the I2C recovery. The default is open-drain.
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Initial clock frequency in Hz
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Size of the submission queue for blocking requests
Default value: |
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Size of the completion queue for blocking requests
Default value: |
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Pin configuration/s for the second state. See pinctrl-0.
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Pin configuration/s for the third state. See pinctrl-0.
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Pin configuration/s for the fourth state. See pinctrl-0.
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Pin configuration/s for the fifth state. See pinctrl-0.
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Deprecated node specific properties
Deprecated properties not inherited from the base binding file.
(None)
Base properties
Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “ite,enhance-i2c” compatible.
Name |
Type |
Details |
|---|---|---|
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register space
This property is required. See Important properties for more information. |
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interrupts for device
This property is required. See Important properties for more information. |
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number of address cells in reg property
This property is required. Constant value: |
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number of size cells in reg property
This property is required. |
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indicates the operational status of a device
Legal values: See Important properties for more information. |
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compatible strings
This property is required. See Important properties for more information. |
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name of each register space
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extended interrupt specifier for device
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name of each interrupt
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phandle to interrupt controller node
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Human readable string describing the device (used as device_get_binding() argument)
See Important properties for more information. This property is deprecated. |
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Clock gate information
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name of each clock
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DMA channels specifiers
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Provided names of DMA channel specifiers
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IO channels specifiers
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Provided names of IO channel specifiers
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mailbox / IPM channels specifiers
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Provided names of mailbox / IPM channel specifiers
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Power domain specifiers
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Provided names of power domain specifiers
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Number of cells in power-domains property
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Do not initialize device automatically on boot. Device should be manually
initialized using device_init().
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Property to identify that a device can be used as wake up source.
When this property is provided a specific flag is set into the
device that tells the system that the device is capable of
wake up the system.
Wake up capable devices are disabled (interruptions will not wake up
the system) by default but they can be enabled at runtime if necessary.
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Automatically configure the device for runtime power management after the
init function runs.
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List of power states that will disable this device power.
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