# # I2C subsystem configuration # menuconfig I2C bool "I2C support" default y help Note: This is a stand-in for an option to enable I2C support. In fact this simply enables building of the I2C directory for U-Boot. The actual I2C feature is enabled by DM_I2C (for driver model) and the #define CONFIG_SYS_I2C_LEGACY (for the legacy I2C stack). So at present there is no need to ever disable this option. Eventually it will: Enable support for the I2C (Inter-Integrated Circuit) bus in U-Boot. I2C works with a clock and data line which can be driven by a one or more masters or slaves. It is a fairly complex bus but is widely used as it only needs two lines for communication. Speeds of 400kbps are typical but up to 3.4Mbps is supported by some hardware. Enable this option to build the drivers in drivers/i2c as part of a U-Boot build. if I2C 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 plat. The interface is defined in include/i2c.h. config SPL_DM_I2C bool "Enable Driver Model for I2C drivers in SPL" depends on SPL_DM && DM_I2C default y 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. 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 I2C_SET_DEFAULT_BUS_NUM bool "Set default I2C bus number" depends on DM_I2C help Set default number of I2C bus to be accessed. This option provides behaviour similar to old (i.e. pre DM) I2C bus driver. config I2C_DEFAULT_BUS_NUMBER hex "I2C default bus number" depends on I2C_SET_DEFAULT_BUS_NUM default 0x0 help Number of default I2C bus to use 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 SPL_DM_I2C_GPIO bool "Enable Driver Model for software emulated I2C bus driver in SPL" depends on SPL_DM && DM_I2C_GPIO && SPL_DM_GPIO && SPL_GPIO default y 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_AT91 bool "Atmel I2C driver" depends on DM_I2C && ARCH_AT91 help Add support for the Atmel I2C driver. A serious problem is that there is no documented way to issue repeated START conditions for more than two messages, as needed to support combined I2C messages. Use the i2c-gpio driver unless your system can cope with this limitation. Binding info: doc/device-tree-bindings/i2c/i2c-at91.txt config SYS_I2C_IPROC bool "Broadcom I2C driver" depends on DM_I2C help Broadcom I2C driver. Add support for Broadcom I2C driver. Say yes here to to enable the Broadco I2C driver. config SYS_I2C_FSL bool "Freescale I2C bus driver" depends on DM_I2C help Add support for Freescale I2C busses as used on MPC8240, MPC8245, and MPC85xx processors. config SYS_I2C_CADENCE tristate "Cadence I2C Controller" depends on DM_I2C help Say yes here to select Cadence I2C Host Controller. This controller is e.g. used by Xilinx Zynq. config SYS_I2C_CA tristate "Cortina-Access I2C Controller" depends on DM_I2C && CORTINA_PLATFORM default n help Add support for the Cortina Access I2C host controller. Say yes here to select Cortina-Access I2C Host Controller. config SYS_I2C_DAVINCI bool "Davinci I2C Controller" depends on (ARCH_KEYSTONE || ARCH_DAVINCI) help Say yes here to add support for Davinci and Keystone I2C controller config SYS_I2C_DW bool "Designware I2C Controller" default n help Say yes here to select the Designware I2C Host Controller. This controller is used in various SoCs, e.g. the ST SPEAr, Altera SoCFPGA, Synopsys ARC700 and some Intel x86 SoCs. config SYS_I2C_ASPEED bool "Aspeed I2C Controller" depends on DM_I2C && ARCH_ASPEED help Say yes here to select Aspeed I2C Host Controller. The driver supports AST2500 and AST2400 controllers, but is very limited. Only single master mode is supported and only byte-by-byte synchronous reads and writes are supported, no Pool Buffers or DMA. 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_IMX_LPI2C bool "NXP i.MX LPI2C driver" help Add support for the NXP i.MX LPI2C driver. config SYS_I2C_LPC32XX bool "LPC32XX I2C driver" depends on ARCH_LPC32XX help Enable support for the LPC32xx I2C driver. config SYS_I2C_MESON bool "Amlogic Meson I2C driver" depends on DM_I2C && ARCH_MESON help Add support for the I2C controller available in Amlogic Meson SoCs. The controller supports programmable bus speed including standard (100kbits/s) and fast (400kbit/s) speed and allows the software to define a flexible format of the bit streams. It has an internal buffer holding up to 8 bytes for transfers and supports both 7-bit and 10-bit addresses. config SYS_I2C_MXC bool "NXP MXC I2C driver" help Add support for the NXP I2C driver. This supports up to four bus channels and operating on standard mode up to 100 kbits/s and fast mode up to 400 kbits/s. # These settings are not used with DM_I2C, however SPL doesn't use # DM_I2C even if DM_I2C is enabled, and so might use these settings even # when main u-boot does not! if SYS_I2C_MXC && (!DM_I2C || SPL) config SYS_I2C_MXC_I2C1 bool "NXP MXC I2C1" help Add support for NXP MXC I2C Controller 1. Required for SoCs which have I2C MXC controller 1 eg LS1088A, LS2080A config SYS_I2C_MXC_I2C2 bool "NXP MXC I2C2" help Add support for NXP MXC I2C Controller 2. Required for SoCs which have I2C MXC controller 2 eg LS1088A, LS2080A config SYS_I2C_MXC_I2C3 bool "NXP MXC I2C3" help Add support for NXP MXC I2C Controller 3. Required for SoCs which have I2C MXC controller 3 eg LS1088A, LS2080A config SYS_I2C_MXC_I2C4 bool "NXP MXC I2C4" help Add support for NXP MXC I2C Controller 4. Required for SoCs which have I2C MXC controller 4 eg LS1088A, LS2080A config SYS_I2C_MXC_I2C5 bool "NXP MXC I2C5" help Add support for NXP MXC I2C Controller 5. Required for SoCs which have I2C MXC controller 5 eg LX2160A config SYS_I2C_MXC_I2C6 bool "NXP MXC I2C6" help Add support for NXP MXC I2C Controller 6. Required for SoCs which have I2C MXC controller 6 eg LX2160A config SYS_I2C_MXC_I2C7 bool "NXP MXC I2C7" help Add support for NXP MXC I2C Controller 7. Required for SoCs which have I2C MXC controller 7 eg LX2160A config SYS_I2C_MXC_I2C8 bool "NXP MXC I2C8" help Add support for NXP MXC I2C Controller 8. Required for SoCs which have I2C MXC controller 8 eg LX2160A endif if SYS_I2C_MXC_I2C1 config SYS_MXC_I2C1_SPEED int "I2C Channel 1 speed" default 40000000 if TARGET_LS2080A_EMU default 100000 help MXC I2C Channel 1 speed config SYS_MXC_I2C1_SLAVE int "I2C1 Slave" default 0 help MXC I2C1 Slave endif if SYS_I2C_MXC_I2C2 config SYS_MXC_I2C2_SPEED int "I2C Channel 2 speed" default 40000000 if TARGET_LS2080A_EMU default 100000 help MXC I2C Channel 2 speed config SYS_MXC_I2C2_SLAVE int "I2C2 Slave" default 0 help MXC I2C2 Slave endif if SYS_I2C_MXC_I2C3 config SYS_MXC_I2C3_SPEED int "I2C Channel 3 speed" default 100000 help MXC I2C Channel 3 speed config SYS_MXC_I2C3_SLAVE int "I2C3 Slave" default 0 help MXC I2C3 Slave endif if SYS_I2C_MXC_I2C4 config SYS_MXC_I2C4_SPEED int "I2C Channel 4 speed" default 100000 help MXC I2C Channel 4 speed config SYS_MXC_I2C4_SLAVE int "I2C4 Slave" default 0 help MXC I2C4 Slave endif if SYS_I2C_MXC_I2C5 config SYS_MXC_I2C5_SPEED int "I2C Channel 5 speed" default 100000 help MXC I2C Channel 5 speed config SYS_MXC_I2C5_SLAVE int "I2C5 Slave" default 0 help MXC I2C5 Slave endif if SYS_I2C_MXC_I2C6 config SYS_MXC_I2C6_SPEED int "I2C Channel 6 speed" default 100000 help MXC I2C Channel 6 speed config SYS_MXC_I2C6_SLAVE int "I2C6 Slave" default 0 help MXC I2C6 Slave endif if SYS_I2C_MXC_I2C7 config SYS_MXC_I2C7_SPEED int "I2C Channel 7 speed" default 100000 help MXC I2C Channel 7 speed config SYS_MXC_I2C7_SLAVE int "I2C7 Slave" default 0 help MXC I2C7 Slave endif if SYS_I2C_MXC_I2C8 config SYS_MXC_I2C8_SPEED int "I2C Channel 8 speed" default 100000 help MXC I2C Channel 8 speed config SYS_MXC_I2C8_SLAVE int "I2C8 Slave" default 0 help MXC I2C8 Slave endif config SYS_I2C_NEXELL bool "Nexell I2C driver" depends on DM_I2C help Add support for the Nexell I2C driver. This is used with various Nexell parts such as S5Pxx18 series SoCs. All chips have several I2C ports and all are provided, controlled by the device tree. config SYS_I2C_OCORES bool "ocores I2C driver" depends on DM_I2C help Add support for ocores I2C controller. For details see https://opencores.org/projects/i2c config SYS_I2C_OMAP24XX bool "TI OMAP2+ I2C driver" depends on ARCH_OMAP2PLUS || ARCH_K3 help Add support for the OMAP2+ I2C driver. if SYS_I2C_OMAP24XX config SYS_OMAP24_I2C_SLAVE int "I2C Slave addr channel 0" default 1 help OMAP24xx I2C Slave address channel 0 config SYS_OMAP24_I2C_SPEED int "I2C Slave channel 0 speed" default 100000 help OMAP24xx Slave speed channel 0 endif config SYS_I2C_RCAR_I2C bool "Renesas RCar I2C driver" depends on (RCAR_GEN3 || RCAR_GEN2) && DM_I2C help Support for Renesas RCar I2C controller. config SYS_I2C_RCAR_IIC bool "Renesas RCar Gen3 IIC driver" depends on (RCAR_GEN3 || RCAR_GEN2) && DM_I2C help Support for Renesas RCar Gen3 IIC controller. 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, controlled 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. See sandbox.dts as an example. config SYS_I2C_OCTEON bool "Octeon II/III/TX/TX2 I2C driver" depends on (ARCH_OCTEON || ARCH_OCTEONTX || ARCH_OCTEONTX2) && DM_I2C default y help Add support for the Marvell Octeon I2C driver. This is used with various Octeon parts such as Octeon II/III and OcteonTX/TX2. All chips have several I2C ports and all are provided, controlled by the device tree. config SYS_I2C_S3C24X0 bool "Samsung I2C driver" depends on (ARCH_EXYNOS4 || ARCH_EXYNOS5) && DM_I2C help Support for Samsung I2C controller as Samsung SoCs. config SYS_I2C_STM32F7 bool "STMicroelectronics STM32F7 I2C support" depends on (STM32F7 || STM32H7 || ARCH_STM32MP) && DM_I2C help Enable this option to add support for STM32 I2C controller introduced with STM32F7/H7 SoCs. This I2C controller supports : _ Slave and master modes _ Multimaster capability _ Standard-mode (up to 100 kHz) _ Fast-mode (up to 400 kHz) _ Fast-mode Plus (up to 1 MHz) _ 7-bit and 10-bit addressing mode _ Multiple 7-bit slave addresses (2 addresses, 1 with configurable mask) _ All 7-bit addresses acknowledge mode _ General call _ Programmable setup and hold times _ Easy to use event management _ Optional clock stretching _ Software reset config SYS_I2C_SYNQUACER bool "Socionext SynQuacer I2C controller" depends on ARCH_SYNQUACER && DM_I2C help Support for Socionext Synquacer I2C controller. This I2C controller will be used for RTC and LS-connector on DeveloperBox. config SYS_I2C_TEGRA bool "NVIDIA Tegra internal I2C controller" depends on ARCH_TEGRA help Support for NVIDIA I2C controller available in Tegra SoCs. 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. config SYS_I2C_VERSATILE bool "Arm Ltd Versatile I2C bus driver" depends on DM_I2C && TARGET_VEXPRESS64_JUNO help Add support for the Arm Ltd Versatile Express I2C driver. The I2C host controller is present in the development boards manufactured by Arm Ltd. config SYS_I2C_MVTWSI bool "Marvell I2C driver" depends on DM_I2C help Support for Marvell I2C controllers as used on the orion5x and kirkwood SoC families. config TEGRA186_BPMP_I2C bool "Enable Tegra186 BPMP-based I2C driver" depends on TEGRA186_BPMP help Support for Tegra I2C controllers managed by the BPMP (Boot and Power Management Processor). On Tegra186, some I2C controllers are directly controlled by the main CPU, whereas others are controlled by the BPMP, and can only be accessed by the main CPU via IPC requests to the BPMP. This driver covers the latter case. config SYS_I2C_BUS_MAX int "Max I2C busses" depends on ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_SOCFPGA default 2 if TI816X default 3 if OMAP34XX || AM33XX || AM43XX || ARCH_KEYSTONE default 4 if ARCH_SOCFPGA || OMAP44XX || TI814X default 5 if OMAP54XX help Define the maximum number of available I2C buses. config SYS_I2C_XILINX_XIIC bool "Xilinx AXI I2C driver" depends on DM_I2C help Support for Xilinx AXI I2C controller. config SYS_I2C_IHS bool "gdsys IHS I2C driver" depends on DM_I2C help Support for gdsys IHS I2C driver on FPGA bus. source "drivers/i2c/muxes/Kconfig" endif