Subject: [PATCH v3 2/4] iio: adc: meson-saradc: add support for Meson S4

From: Nick Xie <[email-masked]>
Date: Wed, 25 Mar 2026 15:06:16 +0800

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 <[email-masked]>
Signed-off-by: Nick Xie <[email-masked]>
---
 drivers/iio/adc/meson_saradc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
index 47cd350498a0d..3ac48b7842c4f 100644
--- a/drivers/iio/adc/meson_saradc.c
+++ b/drivers/iio/adc/meson_saradc.c
@@ -1313,6 +1313,11 @@ 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",
@@ -1341,6 +1346,9 @@ 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,
 	},
 	{ }
 };
-- 
2.34.1