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i2c: testunit: describe fwnode based instantiation

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The testunit can also be instantiated via firmware nodes. Give a
devicetree node as an example.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
This commit is contained in:
Wolfram Sang 2024-08-14 20:22:07 +02:00
parent 45c03c65ea
commit bbec612963
1 changed files with 12 additions and 0 deletions
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Documentation/i2c/slave-testunit-backend.rst
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@ -20,6 +20,18 @@ Instantiating the device is regular. Example for bus 0, address 0x30::
# echo "slave-testunit 0x1030" > /sys/bus/i2c/devices/i2c-0/new_device
Or using firmware nodes. Here is a devicetree example (note this is only a
debug device, so there are no official DT bindings)::
&i2c0 {
...
testunit@30 {
compatible = "slave-testunit";
reg = <(0x30 | I2C_OWN_SLAVE_ADDRESS)>;
};
};
After that, you will have the device listening. Reading will return a single
byte. Its value is 0 if the testunit is idle, otherwise the command number of
the currently running command.