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8600b697cd
Pull i2c updates from Wolfram Sang: - the first series of making i2c_device_id optional instead of mandatory (in favor of alternatives like of_device_id). This involves adding a new probe callback (probe_new) which removes some peculiarities I2C had for a long time now. The new probe is matching the other subsystems now and the old one will be removed once all users are converted. It is expected to take a while but there is ongoing interest in that. - SMBus Host Notify introduced 4.9 got refactored. They are now using interrupts instead of the alert callback which solves multiple issues. - new drivers for iMX LowPower I2C, Mellanox CPLD and its I2C mux - significant refactoring for bcm2835 driver - the usual set of driver updates and improvements * 'i2c/for-4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (46 commits) i2c: fsl-lpi2c: read lpi2c fifo size in probe() i2c: octeon: thunderx: Remove double-check after interrupt i2c: octeon: thunderx: TWSI software reset in recovery i2c: cadence: Allow Cadence I2C to be selected for Cadence Xtensa CPUs i2c: sh_mobile: Add per-Generation fallback bindings i2c: rcar: Add per-Generation fallback bindings i2c: imx-lpi2c: add low power i2c bus driver dt-bindings: i2c: imx-lpi2c: add devicetree bindings i2c: designware-pcidrv: Add 10bit address feature to medfield/merrifield i2c: pxa: Add support for the I2C units found in Armada 3700 i2c: pxa: Add definition of fast and high speed modes via the regs layout dt-bindings: i2c: pxa: Update the documentation for the Armada 3700 i2c: qup: support SMBus block read i2c: qup: add ACPI support i2c: designware: Consolidate default functionality bits i2c: i2c-mux-gpio: update mux with gpiod_set_array_value_cansleep i2c: mux: pca954x: Add ACPI support for pca954x i2c: use an IRQ to report Host Notify events, not alert i2c: i801: remove SMBNTFDDAT reads as they always seem to return 0 i2c: i801: use the BIT() macro for FEATURES_* also ...
149 lines
4.4 KiB
Text
149 lines
4.4 KiB
Text
#
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# I2C subsystem configuration
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#
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menu "I2C support"
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config I2C
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tristate "I2C support"
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select RT_MUTEXES
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select IRQ_DOMAIN
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---help---
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I2C (pronounce: I-squared-C) is a slow serial bus protocol used in
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many micro controller applications and developed by Philips. SMBus,
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or System Management Bus is a subset of the I2C protocol. More
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information is contained in the directory <file:Documentation/i2c/>,
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especially in the file called "summary" there.
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Both I2C and SMBus are supported here. You will need this for
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hardware sensors support, and also for Video For Linux support.
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If you want I2C support, you should say Y here and also to the
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specific driver for your bus adapter(s) below.
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This I2C support can also be built as a module. If so, the module
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will be called i2c-core.
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config ACPI_I2C_OPREGION
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bool "ACPI I2C Operation region support"
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depends on I2C=y && ACPI
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default y
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help
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Say Y here if you want to enable ACPI I2C operation region support.
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Operation Regions allow firmware (BIOS) code to access I2C slave devices,
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such as smart batteries through an I2C host controller driver.
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if I2C
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config I2C_BOARDINFO
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bool
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default y
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config I2C_COMPAT
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bool "Enable compatibility bits for old user-space"
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default y
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help
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Say Y here if you intend to run lm-sensors 3.1.1 or older, or any
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other user-space package which expects i2c adapters to be class
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devices. If you don't know, say Y.
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config I2C_CHARDEV
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tristate "I2C device interface"
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help
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Say Y here to use i2c-* device files, usually found in the /dev
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directory on your system. They make it possible to have user-space
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programs use the I2C bus. Information on how to do this is
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contained in the file <file:Documentation/i2c/dev-interface>.
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This support is also available as a module. If so, the module
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will be called i2c-dev.
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config I2C_MUX
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tristate "I2C bus multiplexing support"
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help
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Say Y here if you want the I2C core to support the ability to
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handle multiplexed I2C bus topologies, by presenting each
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multiplexed segment as a I2C adapter.
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This support is also available as a module. If so, the module
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will be called i2c-mux.
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source drivers/i2c/muxes/Kconfig
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config I2C_HELPER_AUTO
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bool "Autoselect pertinent helper modules"
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default y
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help
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Some I2C bus drivers require so-called "I2C algorithm" modules
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to work. These are basically software-only abstractions of generic
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I2C interfaces. This option will autoselect them so that you don't
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have to care.
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Unselect this only if you need to enable additional helper
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modules, for example for use with external I2C bus drivers.
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In doubt, say Y.
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config I2C_SMBUS
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tristate "SMBus-specific protocols" if !I2C_HELPER_AUTO
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help
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Say Y here if you want support for SMBus extensions to the I2C
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specification. At the moment, two extensions are supported:
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the SMBus Alert protocol and the SMBus Host Notify protocol.
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This support is also available as a module. If so, the module
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will be called i2c-smbus.
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source drivers/i2c/algos/Kconfig
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source drivers/i2c/busses/Kconfig
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config I2C_STUB
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tristate "I2C/SMBus Test Stub"
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depends on m
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default 'n'
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help
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This module may be useful to developers of SMBus client drivers,
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especially for certain kinds of sensor chips.
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If you do build this module, be sure to read the notes and warnings
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in <file:Documentation/i2c/i2c-stub>.
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If you don't know what to do here, definitely say N.
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config I2C_SLAVE
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bool "I2C slave support"
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if I2C_SLAVE
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config I2C_SLAVE_EEPROM
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tristate "I2C eeprom slave driver"
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endif
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config I2C_DEBUG_CORE
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bool "I2C Core debugging messages"
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help
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Say Y here if you want the I2C core to produce a bunch of debug
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messages to the system log. Select this if you are having a
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problem with I2C support and want to see more of what is going on.
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config I2C_DEBUG_ALGO
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bool "I2C Algorithm debugging messages"
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help
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Say Y here if you want the I2C algorithm drivers to produce a bunch
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of debug messages to the system log. Select this if you are having
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a problem with I2C support and want to see more of what is going
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on.
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config I2C_DEBUG_BUS
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bool "I2C Bus debugging messages"
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depends on HAS_IOMEM
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help
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Say Y here if you want the I2C bus drivers to produce a bunch of
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debug messages to the system log. Select this if you are having
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a problem with I2C support and want to see more of what is going
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on.
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endif # I2C
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endmenu
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