diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/i2c/i2c-efm32.txt | 4 | ||||
| -rw-r--r-- | Documentation/i2c/busses/i2c-i801 | 1 | ||||
| -rw-r--r-- | Documentation/i2c/i2c-stub | 23 |
3 files changed, 20 insertions, 8 deletions
diff --git a/Documentation/devicetree/bindings/i2c/i2c-efm32.txt b/Documentation/devicetree/bindings/i2c/i2c-efm32.txt index fc15ac519437..50b25c3da186 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-efm32.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-efm32.txt @@ -10,7 +10,7 @@ Required properties : Recommended properties : - clock-frequency : maximal I2C bus clock frequency in Hz. - - efm32,location : Decides the location of the USART I/O pins. + - energymicro,location : Decides the location of the USART I/O pins. Allowed range : [0 .. 6] Example: @@ -23,7 +23,7 @@ Example: clocks = <&cmu clk_HFPERCLKI2C0>; clock-frequency = <100000>; status = "ok"; - efm32,location = <3>; + energymicro,location = <3>; eeprom@50 { compatible = "microchip,24c02"; diff --git a/Documentation/i2c/busses/i2c-i801 b/Documentation/i2c/busses/i2c-i801 index adf5e33e8312..e9c803ea306d 100644 --- a/Documentation/i2c/busses/i2c-i801 +++ b/Documentation/i2c/busses/i2c-i801 @@ -25,6 +25,7 @@ Supported adapters: * Intel Avoton (SOC) * Intel Wellsburg (PCH) * Intel Coleto Creek (PCH) + * Intel Wildcat Point (PCH) * Intel Wildcat Point-LP (PCH) * Intel BayTrail (SOC) Datasheets: Publicly available at the Intel website diff --git a/Documentation/i2c/i2c-stub b/Documentation/i2c/i2c-stub index fa4b669c166b..a16924fbd289 100644 --- a/Documentation/i2c/i2c-stub +++ b/Documentation/i2c/i2c-stub @@ -2,9 +2,9 @@ MODULE: i2c-stub DESCRIPTION: -This module is a very simple fake I2C/SMBus driver. It implements five +This module is a very simple fake I2C/SMBus driver. It implements six types of SMBus commands: write quick, (r/w) byte, (r/w) byte data, (r/w) -word data, and (r/w) I2C block data. +word data, (r/w) I2C block data, and (r/w) SMBus block data. You need to provide chip addresses as a module parameter when loading this driver, which will then only react to SMBus commands to these addresses. @@ -19,6 +19,14 @@ A pointer register with auto-increment is implemented for all byte operations. This allows for continuous byte reads like those supported by EEPROMs, among others. +SMBus block command support is disabled by default, and must be enabled +explicitly by setting the respective bits (0x03000000) in the functionality +module parameter. + +SMBus block commands must be written to configure an SMBus command for +SMBus block operations. Writes can be partial. Block read commands always +return the number of bytes selected with the largest write so far. + The typical use-case is like this: 1. load this module 2. use i2cset (from the i2c-tools project) to pre-load some data @@ -39,15 +47,18 @@ unsigned long functionality: value 0x1f0000 would only enable the quick, byte and byte data commands. +u8 bank_reg[10] +u8 bank_mask[10] +u8 bank_start[10] +u8 bank_end[10]: + Optional bank settings. They tell which bits in which register + select the active bank, as well as the range of banked registers. + CAVEATS: If your target driver polls some byte or word waiting for it to change, the stub could lock it up. Use i2cset to unlock it. -If the hardware for your driver has banked registers (e.g. Winbond sensors -chips) this module will not work well - although it could be extended to -support that pretty easily. - If you spam it hard enough, printk can be lossy. This module really wants something like relayfs. |