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| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2024-08-14 21:22:07 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2024-08-26 16:15:22 +0300 |
| commit | bbec612963fde8f6e5f0ce98aad63169d8c64553 (patch) | |
| tree | 98a84255bab6c4faccb5d5c37dd853d83d08c27b | |
| parent | 45c03c65ea77bd1a28ed1791b61594f579ee01ab (diff) | |
| download | linux-bbec612963fde8f6e5f0ce98aad63169d8c64553.tar.xz | |
i2c: testunit: describe fwnode based instantiation
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>
| -rw-r--r-- | Documentation/i2c/slave-testunit-backend.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/i2c/slave-testunit-backend.rst b/Documentation/i2c/slave-testunit-backend.rst index d3ab5944877d..3743188ecfc7 100644 --- a/Documentation/i2c/slave-testunit-backend.rst +++ b/Documentation/i2c/slave-testunit-backend.rst @@ -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. |