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This is used on most Intel platforms. We don't have a driver for it yet, but add a stub to handle the init. For now this targets ivybridge so we may want to add a device tree binding and generalise it when other platforms are supported. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Heiko Schocher <hs@denx.de> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
128 lines
4.2 KiB
Plaintext
128 lines
4.2 KiB
Plaintext
#
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# I2C subsystem configuration
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#
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menu "I2C support"
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config DM_I2C
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bool "Enable Driver Model for I2C drivers"
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depends on DM
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help
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Enable driver model for I2C. The I2C uclass interface: probe, read,
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write and speed, is implemented with the bus drivers operations,
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which provide methods for bus setting and data transfer. Each chip
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device (bus child) info is kept as parent platdata. The interface
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is defined in include/i2c.h. When i2c bus driver supports the i2c
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uclass, but the device drivers not, then DM_I2C_COMPAT config can
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be used as compatibility layer.
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config DM_I2C_COMPAT
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bool "Enable I2C compatibility layer"
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depends on DM
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help
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Enable old-style I2C functions for compatibility with existing code.
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This option can be enabled as a temporary measure to avoid needing
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to convert all code for a board in a single commit. It should not
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be enabled for any board in an official release.
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config I2C_CROS_EC_TUNNEL
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tristate "Chrome OS EC tunnel I2C bus"
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depends on CROS_EC
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help
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This provides an I2C bus that will tunnel i2c commands through to
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the other side of the Chrome OS EC to the I2C bus connected there.
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This will work whatever the interface used to talk to the EC (SPI,
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I2C or LPC). Some Chromebooks use this when the hardware design
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does not allow direct access to the main PMIC from the AP.
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config I2C_CROS_EC_LDO
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bool "Provide access to LDOs on the Chrome OS EC"
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depends on CROS_EC
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---help---
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On many Chromebooks the main PMIC is inaccessible to the AP. This is
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often dealt with by using an I2C pass-through interface provided by
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the EC. On some unfortunate models (e.g. Spring) the pass-through
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is not available, and an LDO message is available instead. This
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option enables a driver which provides very basic access to those
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regulators, via the EC. We implement this as an I2C bus which
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emulates just the TPS65090 messages we know about. This is done to
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avoid duplicating the logic in the TPS65090 regulator driver for
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enabling/disabling an LDO.
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config DM_I2C_GPIO
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bool "Enable Driver Model for software emulated I2C bus driver"
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depends on DM_I2C && DM_GPIO
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help
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Enable the i2c bus driver emulation by using the GPIOs. The bus GPIO
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configuration is given by the device tree. Kernel-style device tree
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bindings are supported.
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Binding info: doc/device-tree-bindings/i2c/i2c-gpio.txt
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config SYS_I2C_INTEL
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bool "Intel I2C/SMBUS driver"
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depends on DM_I2C
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help
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Add support for the Intel SMBUS driver. So far this driver is just
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a stub which perhaps some basic init. There is no implementation of
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the I2C API meaning that any I2C operations will immediately fail
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for now.
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config SYS_I2C_ROCKCHIP
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bool "Rockchip I2C driver"
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depends on DM_I2C
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help
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Add support for the Rockchip I2C driver. This is used with various
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Rockchip parts such as RK3126, RK3128, RK3036 and RK3288. All chips
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have several I2C ports and all are provided, controled by the
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device tree.
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config SYS_I2C_SANDBOX
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bool "Sandbox I2C driver"
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depends on SANDBOX && DM_I2C
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help
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Enable I2C support for sandbox. This is an emulation of a real I2C
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bus. Devices can be attached to the bus using the device tree
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which specifies the driver to use. As an example, see this device
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tree fragment from sandbox.dts. It shows that the I2C bus has a
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single EEPROM at address 0x2c (7-bit address) which is emulated by
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the driver for "sandbox,i2c-eeprom", which is in
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drivers/misc/i2c_eeprom_emul.c.
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i2c@0 {
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0>;
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compatible = "sandbox,i2c";
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clock-frequency = <400000>;
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eeprom@2c {
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reg = <0x2c>;
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compatible = "i2c-eeprom";
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emul {
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compatible = "sandbox,i2c-eeprom";
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sandbox,filename = "i2c.bin";
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sandbox,size = <128>;
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};
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};
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};
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config SYS_I2C_UNIPHIER
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bool "UniPhier I2C driver"
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depends on ARCH_UNIPHIER && DM_I2C
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default y
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help
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Support for UniPhier I2C controller driver. This I2C controller
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is used on PH1-LD4, PH1-sLD8 or older UniPhier SoCs.
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config SYS_I2C_UNIPHIER_F
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bool "UniPhier FIFO-builtin I2C driver"
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depends on ARCH_UNIPHIER && DM_I2C
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default y
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help
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Support for UniPhier FIFO-builtin I2C controller driver.
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This I2C controller is used on PH1-Pro4 or newer UniPhier SoCs.
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source "drivers/i2c/muxes/Kconfig"
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endmenu
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