iio: stmpe-adc: use of_device_id for OF matching

The of_device_id was added to allow module autoloading, but it should be
also used to allow driver matching via Devicetree.

This also fixes W=1 warning:
  drivers/iio/adc/stmpe-adc.c:357:34: error: ‘stmpe_adc_ids’ defined but not used [-Werror=unused-const-variable=]

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220501103447.111392-1-krzysztof.kozlowski@linaro.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/stmpe-adc.c b/drivers/iio/adc/stmpe-adc.c
index 83e0ac4..000e5cf 100644 (file)
--- a/drivers/iio/adc/stmpe-adc.c
+++ b/drivers/iio/adc/stmpe-adc.c
@@ -345,21 +345,22 @@ static int __maybe_unused stmpe_adc_resume(struct device *dev)
 
 static SIMPLE_DEV_PM_OPS(stmpe_adc_pm_ops, NULL, stmpe_adc_resume);
 
+static const struct of_device_id stmpe_adc_ids[] = {
+       { .compatible = "st,stmpe-adc", },
+       { },
+};
+MODULE_DEVICE_TABLE(of, stmpe_adc_ids);
+
 static struct platform_driver stmpe_adc_driver = {
        .probe          = stmpe_adc_probe,
        .driver         = {
                .name   = "stmpe-adc",
                .pm     = &stmpe_adc_pm_ops,
+               .of_match_table = stmpe_adc_ids,
        },
 };
 module_platform_driver(stmpe_adc_driver);
 
-static const struct of_device_id stmpe_adc_ids[] = {
-       { .compatible = "st,stmpe-adc", },
-       { },
-};
-MODULE_DEVICE_TABLE(of, stmpe_adc_ids);
-
 MODULE_AUTHOR("Stefan Agner <stefan.agner@toradex.com>");
 MODULE_DESCRIPTION("STMPEXXX ADC driver");
 MODULE_LICENSE("GPL v2");