2 # I2C subsystem configuration
8 bool "Enable Driver Model for I2C drivers"
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.
20 bool "Enable I2C compatibility layer"
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.
28 config I2C_CROS_EC_TUNNEL
29 tristate "Chrome OS EC tunnel I2C bus"
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.
38 config I2C_CROS_EC_LDO
39 bool "Provide access to LDOs on the Chrome OS EC"
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.
52 config I2C_SET_DEFAULT_BUS_NUM
53 bool "Set default I2C bus number"
56 Set default number of I2C bus to be accessed. This option provides
57 behaviour similar to old (i.e. pre DM) I2C bus driver.
59 config I2C_DEFAULT_BUS_NUMBER
60 hex "I2C default bus number"
61 depends on I2C_SET_DEFAULT_BUS_NUM
64 Number of default I2C bus to use
67 bool "Enable Driver Model for software emulated I2C bus driver"
68 depends on DM_I2C && DM_GPIO
70 Enable the i2c bus driver emulation by using the GPIOs. The bus GPIO
71 configuration is given by the device tree. Kernel-style device tree
72 bindings are supported.
73 Binding info: doc/device-tree-bindings/i2c/i2c-gpio.txt
76 bool "Atmel I2C driver"
77 depends on DM_I2C && ARCH_AT91
79 Add support for the Atmel I2C driver. A serious problem is that there
80 is no documented way to issue repeated START conditions for more than
81 two messages, as needed to support combined I2C messages. Use the
82 i2c-gpio driver unless your system can cope with this limitation.
83 Binding info: doc/device-tree-bindings/i2c/i2c-at91.txt
86 bool "Freescale I2C bus driver"
89 Add support for Freescale I2C busses as used on MPC8240, MPC8245, and
92 config SYS_I2C_CADENCE
93 tristate "Cadence I2C Controller"
94 depends on DM_I2C && (ARCH_ZYNQ || ARM64)
96 Say yes here to select Cadence I2C Host Controller. This controller is
97 e.g. used by Xilinx Zynq.
100 bool "Designware I2C Controller"
103 Say yes here to select the Designware I2C Host Controller. This
104 controller is used in various SoCs, e.g. the ST SPEAr, Altera
105 SoCFPGA, Synopsys ARC700 and some Intel x86 SoCs.
107 config SYS_I2C_DW_ENABLE_STATUS_UNSUPPORTED
108 bool "DW I2C Enable Status Register not supported"
109 depends on SYS_I2C_DW && (TARGET_SPEAR300 || TARGET_SPEAR310 || \
110 TARGET_SPEAR320 || TARGET_SPEAR600 || TARGET_X600)
113 Some versions of the Designware I2C controller do not support the
114 enable status register. This config option can be enabled in such
117 config SYS_I2C_ASPEED
118 bool "Aspeed I2C Controller"
119 depends on DM_I2C && ARCH_ASPEED
121 Say yes here to select Aspeed I2C Host Controller. The driver
122 supports AST2500 and AST2400 controllers, but is very limited.
123 Only single master mode is supported and only byte-by-byte
124 synchronous reads and writes are supported, no Pool Buffers or DMA.
127 bool "Intel I2C/SMBUS driver"
130 Add support for the Intel SMBUS driver. So far this driver is just
131 a stub which perhaps some basic init. There is no implementation of
132 the I2C API meaning that any I2C operations will immediately fail
135 config SYS_I2C_IMX_LPI2C
136 bool "NXP i.MX LPI2C driver"
138 Add support for the NXP i.MX LPI2C driver.
141 bool "Amlogic Meson I2C driver"
142 depends on DM_I2C && ARCH_MESON
144 Add support for the Amlogic Meson I2C driver.
147 bool "NXP i.MX I2C driver"
150 Add support for the NXP i.MX I2C driver. This supports upto for bus
151 channels and operating on standard mode upto 100 kbits/s and fast
152 mode upto 400 kbits/s.
154 config SYS_I2C_OMAP24XX
155 bool "TI OMAP2+ I2C driver"
156 depends on ARCH_OMAP2PLUS
158 Add support for the OMAP2+ I2C driver.
160 config SYS_I2C_ROCKCHIP
161 bool "Rockchip I2C driver"
164 Add support for the Rockchip I2C driver. This is used with various
165 Rockchip parts such as RK3126, RK3128, RK3036 and RK3288. All chips
166 have several I2C ports and all are provided, controled by the
169 config SYS_I2C_SANDBOX
170 bool "Sandbox I2C driver"
171 depends on SANDBOX && DM_I2C
173 Enable I2C support for sandbox. This is an emulation of a real I2C
174 bus. Devices can be attached to the bus using the device tree
175 which specifies the driver to use. See sandbox.dts as an example.
177 config SYS_I2C_S3C24X0
178 bool "Samsung I2C driver"
179 depends on ARCH_EXYNOS4 && DM_I2C
181 Support for Samsung I2C controller as Samsung SoCs.
183 config SYS_I2C_STM32F7
184 bool "STMicroelectronics STM32F7 I2C support"
185 depends on (STM32F7 || STM32H7) && DM_I2C
187 Enable this option to add support for STM32 I2C controller
188 introduced with STM32F7/H7 SoCs. This I2C controller supports :
189 _ Slave and master modes
190 _ Multimaster capability
191 _ Standard-mode (up to 100 kHz)
192 _ Fast-mode (up to 400 kHz)
193 _ Fast-mode Plus (up to 1 MHz)
194 _ 7-bit and 10-bit addressing mode
195 _ Multiple 7-bit slave addresses (2 addresses, 1 with configurable mask)
196 _ All 7-bit addresses acknowledge mode
198 _ Programmable setup and hold times
199 _ Easy to use event management
200 _ Optional clock stretching
203 config SYS_I2C_UNIPHIER
204 bool "UniPhier I2C driver"
205 depends on ARCH_UNIPHIER && DM_I2C
208 Support for UniPhier I2C controller driver. This I2C controller
209 is used on PH1-LD4, PH1-sLD8 or older UniPhier SoCs.
211 config SYS_I2C_UNIPHIER_F
212 bool "UniPhier FIFO-builtin I2C driver"
213 depends on ARCH_UNIPHIER && DM_I2C
216 Support for UniPhier FIFO-builtin I2C controller driver.
217 This I2C controller is used on PH1-Pro4 or newer UniPhier SoCs.
219 config SYS_I2C_MVTWSI
220 bool "Marvell I2C driver"
223 Support for Marvell I2C controllers as used on the orion5x and
224 kirkwood SoC families.
226 config TEGRA186_BPMP_I2C
227 bool "Enable Tegra186 BPMP-based I2C driver"
228 depends on TEGRA186_BPMP
230 Support for Tegra I2C controllers managed by the BPMP (Boot and
231 Power Management Processor). On Tegra186, some I2C controllers are
232 directly controlled by the main CPU, whereas others are controlled
233 by the BPMP, and can only be accessed by the main CPU via IPC
234 requests to the BPMP. This driver covers the latter case.
236 config SYS_I2C_BUS_MAX
238 depends on ARCH_KEYSTONE || ARCH_OMAP2PLUS || ARCH_SOCFPGA
240 default 3 if OMAP34XX || AM33XX || AM43XX || ARCH_KEYSTONE
241 default 4 if ARCH_SOCFPGA || OMAP44XX || TI814X
242 default 5 if OMAP54XX
244 Define the maximum number of available I2C buses.
246 source "drivers/i2c/muxes/Kconfig"