linux-kernel - [RFC PATCH v1 1/2] hwmon: (iio_hwmon) optionally force iio channel type

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Message-Id: <20210516044315.116290-2-liambeguin@gmail.com>
Date:   Sun, 16 May 2021 00:43:14 -0400
From:   Liam Beguin <liambeguin@...il.com>
To:     liambeguin@...il.com, jdelvare@...e.com, linux@...ck-us.net,
        jic23@...nel.org, lars@...afoo.de, pmeerw@...erw.net
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        robh+dt@...nel.org
Subject: [RFC PATCH v1 1/2] hwmon: (iio_hwmon) optionally force iio channel type

Add a devicetree binding to optionally force a different IIO channel
type.

This is useful in cases where ADC channels are connected to a circuit
that represent another unit such as a temperature or a current.

`channel-types` was chosen instead of `io-channel-types` as this is not
part of the iio consumer bindings.

Signed-off-by: Liam Beguin <liambeguin@...il.com>
---
 drivers/hwmon/iio_hwmon.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwmon/iio_hwmon.c b/drivers/hwmon/iio_hwmon.c
index 580a7d125b88..365ea2359b22 100644
--- a/drivers/hwmon/iio_hwmon.c
+++ b/drivers/hwmon/iio_hwmon.c
@@ -109,6 +109,8 @@ static int iio_hwmon_probe(struct platform_device *pdev)
 		if (ret < 0)
 			return ret;
 
+		of_property_read_u32_index(dev->of_node, "channel-types",
+					   i, &type);
 		switch (type) {
 		case IIO_VOLTAGE:
 			n = in_i++;
-- 
2.30.1.489.g328c10930387