Add device tree bindings for the ADA4250 driver. Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Reviewed-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20220223120112.8067-1-antoniu.miclaus@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>