1# 2# I2C subsystem configuration 3# 4 5menu "I2C support" 6 7config DM_I2C 8 bool "Enable Driver Model for I2C drivers" 9 depends on DM 10 help 11 Enable driver model for I2C. The I2C uclass interface: probe, read, 12 write and speed, is implemented with the bus drivers operations, 13 which provide methods for bus setting and data transfer. Each chip 14 device (bus child) info is kept as parent platdata. The interface 15 is defined in include/i2c.h. When i2c bus driver supports the i2c 16 uclass, but the device drivers not, then DM_I2C_COMPAT config can 17 be used as compatibility layer. 18 19config DM_I2C_COMPAT 20 bool "Enable I2C compatibility layer" 21 depends on DM 22 help 23 Enable old-style I2C functions for compatibility with existing code. 24 This option can be enabled as a temporary measure to avoid needing 25 to convert all code for a board in a single commit. It should not 26 be enabled for any board in an official release. 27 28config I2C_CROS_EC_TUNNEL 29 tristate "Chrome OS EC tunnel I2C bus" 30 depends on CROS_EC 31 help 32 This provides an I2C bus that will tunnel i2c commands through to 33 the other side of the Chrome OS EC to the I2C bus connected there. 34 This will work whatever the interface used to talk to the EC (SPI, 35 I2C or LPC). Some Chromebooks use this when the hardware design 36 does not allow direct access to the main PMIC from the AP. 37 38config I2C_CROS_EC_LDO 39 bool "Provide access to LDOs on the Chrome OS EC" 40 depends on CROS_EC 41 ---help--- 42 On many Chromebooks the main PMIC is inaccessible to the AP. This is 43 often dealt with by using an I2C pass-through interface provided by 44 the EC. On some unfortunate models (e.g. Spring) the pass-through 45 is not available, and an LDO message is available instead. This 46 option enables a driver which provides very basic access to those 47 regulators, via the EC. We implement this as an I2C bus which 48 emulates just the TPS65090 messages we know about. This is done to 49 avoid duplicating the logic in the TPS65090 regulator driver for 50 enabling/disabling an LDO. 51 52config DM_I2C_GPIO 53 bool "Enable Driver Model for software emulated I2C bus driver" 54 depends on DM_I2C && DM_GPIO 55 help 56 Enable the i2c bus driver emulation by using the GPIOs. The bus GPIO 57 configuration is given by the device tree. Kernel-style device tree 58 bindings are supported. 59 Binding info: doc/device-tree-bindings/i2c/i2c-gpio.txt 60 61config SYS_I2C_AT91 62 bool "Atmel I2C driver" 63 depends on DM_I2C && ARCH_AT91 64 help 65 Add support for the Atmel I2C driver. A serious problem is that there 66 is no documented way to issue repeated START conditions for more than 67 two messages, as needed to support combined I2C messages. Use the 68 i2c-gpio driver unless your system can cope with this limitation. 69 Binding info: doc/device-tree-bindings/i2c/i2c-at91.txt 70 71config SYS_I2C_FSL 72 bool "Freescale I2C bus driver" 73 depends on DM_I2C 74 help 75 Add support for Freescale I2C busses as used on MPC8240, MPC8245, and 76 MPC85xx processors. 77 78config SYS_I2C_CADENCE 79 tristate "Cadence I2C Controller" 80 depends on DM_I2C && (ARCH_ZYNQ || ARM64) 81 help 82 Say yes here to select Cadence I2C Host Controller. This controller is 83 e.g. used by Xilinx Zynq. 84 85config SYS_I2C_DW 86 bool "Designware I2C Controller" 87 default n 88 help 89 Say yes here to select the Designware I2C Host Controller. This 90 controller is used in various SoCs, e.g. the ST SPEAr, Altera 91 SoCFPGA, Synopsys ARC700 and some Intel x86 SoCs. 92 93config SYS_I2C_DW_ENABLE_STATUS_UNSUPPORTED 94 bool "DW I2C Enable Status Register not supported" 95 depends on SYS_I2C_DW && (TARGET_SPEAR300 || TARGET_SPEAR310 || \ 96 TARGET_SPEAR320 || TARGET_SPEAR600 || TARGET_X600) 97 default y 98 help 99 Some versions of the Designware I2C controller do not support the 100 enable status register. This config option can be enabled in such 101 cases. 102 103config SYS_I2C_INTEL 104 bool "Intel I2C/SMBUS driver" 105 depends on DM_I2C 106 help 107 Add support for the Intel SMBUS driver. So far this driver is just 108 a stub which perhaps some basic init. There is no implementation of 109 the I2C API meaning that any I2C operations will immediately fail 110 for now. 111 112config SYS_I2C_ROCKCHIP 113 bool "Rockchip I2C driver" 114 depends on DM_I2C 115 help 116 Add support for the Rockchip I2C driver. This is used with various 117 Rockchip parts such as RK3126, RK3128, RK3036 and RK3288. All chips 118 have several I2C ports and all are provided, controled by the 119 device tree. 120 121config SYS_I2C_SANDBOX 122 bool "Sandbox I2C driver" 123 depends on SANDBOX && DM_I2C 124 help 125 Enable I2C support for sandbox. This is an emulation of a real I2C 126 bus. Devices can be attached to the bus using the device tree 127 which specifies the driver to use. As an example, see this device 128 tree fragment from sandbox.dts. It shows that the I2C bus has a 129 single EEPROM at address 0x2c (7-bit address) which is emulated by 130 the driver for "sandbox,i2c-eeprom", which is in 131 drivers/misc/i2c_eeprom_emul.c. 132 133 i2c@0 { 134 #address-cells = <1>; 135 #size-cells = <0>; 136 reg = <0>; 137 compatible = "sandbox,i2c"; 138 clock-frequency = <400000>; 139 eeprom@2c { 140 reg = <0x2c>; 141 compatible = "i2c-eeprom"; 142 emul { 143 compatible = "sandbox,i2c-eeprom"; 144 sandbox,filename = "i2c.bin"; 145 sandbox,size = <128>; 146 }; 147 }; 148 }; 149 150 151config SYS_I2C_UNIPHIER 152 bool "UniPhier I2C driver" 153 depends on ARCH_UNIPHIER && DM_I2C 154 default y 155 help 156 Support for UniPhier I2C controller driver. This I2C controller 157 is used on PH1-LD4, PH1-sLD8 or older UniPhier SoCs. 158 159config SYS_I2C_UNIPHIER_F 160 bool "UniPhier FIFO-builtin I2C driver" 161 depends on ARCH_UNIPHIER && DM_I2C 162 default y 163 help 164 Support for UniPhier FIFO-builtin I2C controller driver. 165 This I2C controller is used on PH1-Pro4 or newer UniPhier SoCs. 166 167config SYS_I2C_MVTWSI 168 bool "Marvell I2C driver" 169 depends on DM_I2C 170 help 171 Support for Marvell I2C controllers as used on the orion5x and 172 kirkwood SoC families. 173 174config TEGRA186_BPMP_I2C 175 bool "Enable Tegra186 BPMP-based I2C driver" 176 depends on TEGRA186_BPMP 177 help 178 Support for Tegra I2C controllers managed by the BPMP (Boot and 179 Power Management Processor). On Tegra186, some I2C controllers are 180 directly controlled by the main CPU, whereas others are controlled 181 by the BPMP, and can only be accessed by the main CPU via IPC 182 requests to the BPMP. This driver covers the latter case. 183 184source "drivers/i2c/muxes/Kconfig" 185 186endmenu 187