[PATCH 1/3] dt-bindings: iio: adc: mediatek,mt6359-auxadc: add mt6397 PMIC AUXADC

[Ryan Brue]

The MediaTek mt6397 PMIC includes a 10-bit AUXADC used for battery voltage
and battery temperature measurements. It is not register compatible with
mt6359: a conversion is requested by writing a channel number to a select
field and pulsing an edge triggered start bit rather than by setting the
channel's bit in a request register, and the results live elsewhere.
It therefore gets its own compatible rather than a fallback.

Add the binding and the header naming the channels a consumer puts in
io-channels. The battery channel is named for the input it measures,
ISENSE, which is what mt6323-auxadc calls the same input.

Assisted-by: LLM
Signed-off-by: Ryan Brue <ryanbrue.dev at gmail.com>
---
 .../devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml      | 1 +
 include/dt-bindings/iio/adc/mediatek,mt6397-auxadc.h             | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml b/Documentation/devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml
index c2f7387e4bfc..2847bd5d5bc4 100644
--- a/Documentation/devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml
+++ b/Documentation/devicetree/bindings/iio/adc/mediatek,mt6359-auxadc.yaml
@@ -26,6 +26,7 @@ properties:
           - mediatek,mt6359-auxadc
           - mediatek,mt6363-auxadc
           - mediatek,mt6373-auxadc
+          - mediatek,mt6397-auxadc
       - items:
           - enum:
               - mediatek,mt6365-auxadc
diff --git a/include/dt-bindings/iio/adc/mediatek,mt6397-auxadc.h b/include/dt-bindings/iio/adc/mediatek,mt6397-auxadc.h
new file mode 100644
index 000000000000..b696c1cb5ebe
--- /dev/null
+++ b/include/dt-bindings/iio/adc/mediatek,mt6397-auxadc.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
+
+#ifndef _DT_BINDINGS_MEDIATEK_MT6397_AUXADC_H
+#define _DT_BINDINGS_MEDIATEK_MT6397_AUXADC_H
+
+#define MT6397_AUXADC_ISENSE		0
+#define MT6397_AUXADC_BAT_TEMP		1
+
+#endif

-- 
2.55.0