mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 08:57:58 +00:00
abb0b01e7a
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>
127 lines
4.2 KiB
Text
127 lines
4.2 KiB
Text
#
|
|
# I2C subsystem configuration
|
|
#
|
|
|
|
menu "I2C support"
|
|
|
|
config DM_I2C
|
|
bool "Enable Driver Model for I2C drivers"
|
|
depends on DM
|
|
help
|
|
Enable driver model for I2C. The I2C uclass interface: probe, read,
|
|
write and speed, is implemented with the bus drivers operations,
|
|
which provide methods for bus setting and data transfer. Each chip
|
|
device (bus child) info is kept as parent platdata. The interface
|
|
is defined in include/i2c.h. When i2c bus driver supports the i2c
|
|
uclass, but the device drivers not, then DM_I2C_COMPAT config can
|
|
be used as compatibility layer.
|
|
|
|
config DM_I2C_COMPAT
|
|
bool "Enable I2C compatibility layer"
|
|
depends on DM
|
|
help
|
|
Enable old-style I2C functions for compatibility with existing code.
|
|
This option can be enabled as a temporary measure to avoid needing
|
|
to convert all code for a board in a single commit. It should not
|
|
be enabled for any board in an official release.
|
|
|
|
config I2C_CROS_EC_TUNNEL
|
|
tristate "Chrome OS EC tunnel I2C bus"
|
|
depends on CROS_EC
|
|
help
|
|
This provides an I2C bus that will tunnel i2c commands through to
|
|
the other side of the Chrome OS EC to the I2C bus connected there.
|
|
This will work whatever the interface used to talk to the EC (SPI,
|
|
I2C or LPC). Some Chromebooks use this when the hardware design
|
|
does not allow direct access to the main PMIC from the AP.
|
|
|
|
config I2C_CROS_EC_LDO
|
|
bool "Provide access to LDOs on the Chrome OS EC"
|
|
depends on CROS_EC
|
|
---help---
|
|
On many Chromebooks the main PMIC is inaccessible to the AP. This is
|
|
often dealt with by using an I2C pass-through interface provided by
|
|
the EC. On some unfortunate models (e.g. Spring) the pass-through
|
|
is not available, and an LDO message is available instead. This
|
|
option enables a driver which provides very basic access to those
|
|
regulators, via the EC. We implement this as an I2C bus which
|
|
emulates just the TPS65090 messages we know about. This is done to
|
|
avoid duplicating the logic in the TPS65090 regulator driver for
|
|
enabling/disabling an LDO.
|
|
|
|
config DM_I2C_GPIO
|
|
bool "Enable Driver Model for software emulated I2C bus driver"
|
|
depends on DM_I2C && DM_GPIO
|
|
help
|
|
Enable the i2c bus driver emulation by using the GPIOs. The bus GPIO
|
|
configuration is given by the device tree. Kernel-style device tree
|
|
bindings are supported.
|
|
Binding info: doc/device-tree-bindings/i2c/i2c-gpio.txt
|
|
|
|
config SYS_I2C_INTEL
|
|
bool "Intel I2C/SMBUS driver"
|
|
depends on DM_I2C
|
|
help
|
|
Add support for the Intel SMBUS driver. So far this driver is just
|
|
a stub which perhaps some basic init. There is no implementation of
|
|
the I2C API meaning that any I2C operations will immediately fail
|
|
for now.
|
|
|
|
config SYS_I2C_ROCKCHIP
|
|
bool "Rockchip I2C driver"
|
|
depends on DM_I2C
|
|
help
|
|
Add support for the Rockchip I2C driver. This is used with various
|
|
Rockchip parts such as RK3126, RK3128, RK3036 and RK3288. All chips
|
|
have several I2C ports and all are provided, controled by the
|
|
device tree.
|
|
|
|
config SYS_I2C_SANDBOX
|
|
bool "Sandbox I2C driver"
|
|
depends on SANDBOX && DM_I2C
|
|
help
|
|
Enable I2C support for sandbox. This is an emulation of a real I2C
|
|
bus. Devices can be attached to the bus using the device tree
|
|
which specifies the driver to use. As an example, see this device
|
|
tree fragment from sandbox.dts. It shows that the I2C bus has a
|
|
single EEPROM at address 0x2c (7-bit address) which is emulated by
|
|
the driver for "sandbox,i2c-eeprom", which is in
|
|
drivers/misc/i2c_eeprom_emul.c.
|
|
|
|
i2c@0 {
|
|
#address-cells = <1>;
|
|
#size-cells = <0>;
|
|
reg = <0>;
|
|
compatible = "sandbox,i2c";
|
|
clock-frequency = <400000>;
|
|
eeprom@2c {
|
|
reg = <0x2c>;
|
|
compatible = "i2c-eeprom";
|
|
emul {
|
|
compatible = "sandbox,i2c-eeprom";
|
|
sandbox,filename = "i2c.bin";
|
|
sandbox,size = <128>;
|
|
};
|
|
};
|
|
};
|
|
|
|
|
|
config SYS_I2C_UNIPHIER
|
|
bool "UniPhier I2C driver"
|
|
depends on ARCH_UNIPHIER && DM_I2C
|
|
default y
|
|
help
|
|
Support for UniPhier I2C controller driver. This I2C controller
|
|
is used on PH1-LD4, PH1-sLD8 or older UniPhier SoCs.
|
|
|
|
config SYS_I2C_UNIPHIER_F
|
|
bool "UniPhier FIFO-builtin I2C driver"
|
|
depends on ARCH_UNIPHIER && DM_I2C
|
|
default y
|
|
help
|
|
Support for UniPhier FIFO-builtin I2C controller driver.
|
|
This I2C controller is used on PH1-Pro4 or newer UniPhier SoCs.
|
|
|
|
source "drivers/i2c/muxes/Kconfig"
|
|
|
|
endmenu
|