iio: adc: meson-saradc: add support for Meson S4

Add support for the SARADC found on the Amlogic Meson S4 SoC.
According to the documentation and current testing, it is fully
compatible with the G12A parameter set, so we reuse
`meson_sar_adc_g12a_data` for this new compatible string.

Although the device tree fallback mechanism could handle the match,
a dedicated entry is added to ensure the userspace ABI correctly
reports the specific part name ("meson-s4-saradc"). This allows
userspace to accurately identify the exact device and maintains
consistency across different firmware types where automatic fallback
parsing might be problematic.

Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Nick Xie <nick@khadas.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
index ed91edf0e391acadb12f6b380b463439a4654ada..23991a3612bdc6b3ff8880e123e464b9a6a9bb5b 100644 (file)
--- a/drivers/iio/adc/meson_saradc.c
+++ b/drivers/iio/adc/meson_saradc.c
@@ -1314,6 +1314,11 @@ static const struct meson_sar_adc_data meson_sar_adc_g12a_data = {
        .name = "meson-g12a-saradc",
 };
 
+static const struct meson_sar_adc_data meson_sar_adc_s4_data = {
+       .param = &meson_sar_adc_g12a_param,
+       .name = "meson-s4-saradc",
+};
+
 static const struct of_device_id meson_sar_adc_of_match[] = {
        {
                .compatible = "amlogic,meson8-saradc",
@@ -1342,6 +1347,9 @@ static const struct of_device_id meson_sar_adc_of_match[] = {
        }, {
                .compatible = "amlogic,meson-g12a-saradc",
                .data = &meson_sar_adc_g12a_data,
+       }, {
+               .compatible = "amlogic,meson-s4-saradc",
+               .data = &meson_sar_adc_s4_data,
        },
        { }
 };