dt-bindings: hwmon: add missing tmp421 binding

Add basic description of the tmp421 driver DT bindings.

Signed-off-by: Krzysztof Adamski <krzysztof.adamski@nokia.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/84ac871e30a406a1613d140a084b4f3390753099.1634206677.git.krzysztof.adamski@nokia.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
1 file changed