linux-kernel - [PATCH 1/5] IIO: Ingenic JZ47xx: Add xlate cb to retrieve correct channel idx

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Message-Id: <20200105001639.142061-1-contact@artur-rojek.eu>
Date:   Sun,  5 Jan 2020 01:16:35 +0100
From:   Artur Rojek <contact@...ur-rojek.eu>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Paul Cercueil <paul@...pouillou.net>
Cc:     linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Artur Rojek <contact@...ur-rojek.eu>
Subject: [PATCH 1/5] IIO: Ingenic JZ47xx: Add xlate cb to retrieve correct channel idx

Provide an of_xlate callback in order to retrieve the correct channel
specifier index from the IIO channels array.

Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>
Tested-by: Paul Cercueil <paul@...pouillou.net>
---
 drivers/iio/adc/ingenic-adc.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/iio/adc/ingenic-adc.c b/drivers/iio/adc/ingenic-adc.c
index 39c0a609fc94..7a24bc1dabe1 100644
--- a/drivers/iio/adc/ingenic-adc.c
+++ b/drivers/iio/adc/ingenic-adc.c
@@ -383,6 +383,21 @@ static int ingenic_adc_read_raw(struct iio_dev *iio_dev,
 	}
 }
 
+static int ingenic_adc_of_xlate(struct iio_dev *iio_dev,
+				const struct of_phandle_args *iiospec)
+{
+	int i;
+
+	if (!iiospec->args_count)
+		return -EINVAL;
+
+	for (i = 0; i < iio_dev->num_channels; ++i)
+		if (iio_dev->channels[i].channel == iiospec->args[0])
+			return i;
+
+	return -EINVAL;
+}
+
 static void ingenic_adc_clk_cleanup(void *data)
 {
 	clk_unprepare(data);
@@ -392,6 +407,7 @@ static const struct iio_info ingenic_adc_info = {
 	.write_raw = ingenic_adc_write_raw,
 	.read_raw = ingenic_adc_read_raw,
 	.read_avail = ingenic_adc_read_avail,
+	.of_xlate = ingenic_adc_of_xlate,
 };
 
 static const struct iio_chan_spec ingenic_channels[] = {
-- 
2.24.1