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author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-10 19:58:25 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-10 19:58:25 (GMT) |
commit | d55fc37856244c929965c190c8e9dcb49e2c07aa (patch) | |
tree | ccb348340a6f0aac546b06487ea6a1d1d35490f6 /Documentation/acpi/i2c-muxes.txt | |
parent | 42d4ebb42a17754d2e8344dc1aa486119671d0eb (diff) | |
parent | 75ecc64ef5a1f310fc80f732ad8cfb7e1bdc59d5 (diff) | |
download | linux-d55fc37856244c929965c190c8e9dcb49e2c07aa.tar.xz |
Merge branch 'i2c/for-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c updates from Wolfram Sang:
- New drivers: UniPhier (with and without FIFO)
- some drivers got some bigger rework: ismt, designware, img-scb (rcar
had to be reverted because issues were showing up just lately)
- ACPI: reworked the device scanning and added support for muxes
... and quite a lot of driver bugfixes and cleanups this time. All
files touched outside of the i2c realm have proper acks.
* 'i2c/for-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (70 commits)
i2c: rcar: Revert the latest refactoring series
i2c: pnx: remove superfluous assignment
MAINTAINERS: i2c: drop i2c-pnx maintainer
MAINTAINERS: i2c: mark also subdirectories as maintained
i2c: cadence: enable driver for ARM64
i2c: i801: Document Intel DNV and Broxton
i2c: at91: manage unexpected RXRDY flag when starting a transfer
i2c: pnx: Use setup_timer instead of open coding it
i2c: add ACPI support for I2C mux ports
acpi: add acpi_preset_companion() stub
i2c: pxa: Add support for pxa910/988 & new configuration features
i2c: au1550: Convert to devm_kzalloc and devm_ioremap_resource
i2c-dev: Fix I2C_SLAVE ioctl comment
i2c-dev: Fix typo in ioctl name reference
i2c: sirf: tune the divider to make i2c bus freq more accurate
i2c: imx: Use -ENXIO as error in the NACK case
i2c: i801: Add support for Intel Broxton
i2c: i801: Add support for Intel DNV
i2c: mediatek: add i2c resume support
i2c: imx: implement bus recovery
...
Diffstat (limited to 'Documentation/acpi/i2c-muxes.txt')
-rw-r--r-- | Documentation/acpi/i2c-muxes.txt | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/Documentation/acpi/i2c-muxes.txt b/Documentation/acpi/i2c-muxes.txt new file mode 100644 index 0000000..9fcc4f0 --- /dev/null +++ b/Documentation/acpi/i2c-muxes.txt @@ -0,0 +1,58 @@ +ACPI I2C Muxes +-------------- + +Describing an I2C device hierarchy that includes I2C muxes requires an ACPI +Device () scope per mux channel. + +Consider this topology: + ++------+ +------+ +| SMB1 |-->| MUX0 |--CH00--> i2c client A (0x50) +| | | 0x70 |--CH01--> i2c client B (0x50) ++------+ +------+ + +which corresponds to the following ASL: + +Device (SMB1) +{ + Name (_HID, ...) + Device (MUX0) + { + Name (_HID, ...) + Name (_CRS, ResourceTemplate () { + I2cSerialBus (0x70, ControllerInitiated, I2C_SPEED, + AddressingMode7Bit, "^SMB1", 0x00, + ResourceConsumer,,) + } + + Device (CH00) + { + Name (_ADR, 0) + + Device (CLIA) + { + Name (_HID, ...) + Name (_CRS, ResourceTemplate () { + I2cSerialBus (0x50, ControllerInitiated, I2C_SPEED, + AddressingMode7Bit, "^CH00", 0x00, + ResourceConsumer,,) + } + } + } + + Device (CH01) + { + Name (_ADR, 1) + + Device (CLIB) + { + Name (_HID, ...) + Name (_CRS, ResourceTemplate () { + I2cSerialBus (0x50, ControllerInitiated, I2C_SPEED, + AddressingMode7Bit, "^CH01", 0x00, + ResourceConsumer,,) + } + } + } + } +} |