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Diffstat (limited to 'Documentation/w1/masters/omap-hdq')
| -rw-r--r-- | Documentation/w1/masters/omap-hdq | 52 |
1 files changed, 0 insertions, 52 deletions
diff --git a/Documentation/w1/masters/omap-hdq b/Documentation/w1/masters/omap-hdq deleted file mode 100644 index 234522709a5f..000000000000 --- a/Documentation/w1/masters/omap-hdq +++ /dev/null @@ -1,52 +0,0 @@ -Kernel driver for omap HDQ/1-wire module. -======================================== - -Supported chips: -================ - HDQ/1-wire controller on the TI OMAP 2430/3430 platforms. - -A useful link about HDQ basics: -=============================== -http://focus.ti.com/lit/an/slua408a/slua408a.pdf - -Description: -============ -The HDQ/1-Wire module of TI OMAP2430/3430 platforms implement the hardware -protocol of the master functions of the Benchmark HDQ and the Dallas -Semiconductor 1-Wire protocols. These protocols use a single wire for -communication between the master (HDQ/1-Wire controller) and the slave -(HDQ/1-Wire external compliant device). - -A typical application of the HDQ/1-Wire module is the communication with battery -monitor (gas gauge) integrated circuits. - -The controller supports operation in both HDQ and 1-wire mode. The essential -difference between the HDQ and 1-wire mode is how the slave device responds to -initialization pulse.In HDQ mode, the firmware does not require the host to -create an initialization pulse to the slave.However, the slave can be reset by -using an initialization pulse (also referred to as a break pulse).The slave -does not respond with a presence pulse as it does in the 1-Wire protocol. - -Remarks: -======== -The driver (drivers/w1/masters/omap_hdq.c) supports the HDQ mode of the -controller. In this mode, as we can not read the ID which obeys the W1 -spec(family:id:crc), a module parameter can be passed to the driver which will -be used to calculate the CRC and pass back an appropriate slave ID to the W1 -core. - -By default the master driver and the BQ slave i/f -driver(drivers/w1/slaves/w1_bq27000.c) sets the ID to 1. -Please note to load both the modules with a different ID if required, but note -that the ID used should be same for both master and slave driver loading. - -e.g: -insmod omap_hdq.ko W1_ID=2 -inamod w1_bq27000.ko F_ID=2 - -The driver also supports 1-wire mode. In this mode, there is no need to -pass slave ID as parameter. The driver will auto-detect slaves connected -to the bus using SEARCH_ROM procedure. 1-wire mode can be selected by -setting "ti,mode" property to "1w" in DT (see -Documentation/devicetree/bindings/w1/omap-hdq.txt for more details). -By default driver is in HDQ mode. |