linux-kernel - [PATCH 3/5] dac: bd79703: Add chip data

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Message-ID: <2cacb4bec5455fe1aa58a0b28d2d91b96a396d1a.1743576022.git.mazziesaccount@gmail.com>
Date: Wed, 2 Apr 2025 09:46:13 +0300
From: Matti Vaittinen <mazziesaccount@...il.com>
To: Matti Vaittinen <mazziesaccount@...il.com>,
	Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matti Vaittinen <mazziesaccount@...il.com>,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] dac: bd79703: Add chip data

Add a chip data structure which allows handling the different variants
(ROHM BD79700, BD79701) with different number of channels.

Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
---
 drivers/iio/dac/rohm-bd79703.c | 29 ++++++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/dac/rohm-bd79703.c b/drivers/iio/dac/rohm-bd79703.c
index 236aa98bf005..35e1b1134ec6 100644
--- a/drivers/iio/dac/rohm-bd79703.c
+++ b/drivers/iio/dac/rohm-bd79703.c
@@ -38,11 +38,19 @@ static const struct regmap_config bd79703_regmap_config = {
 	.cache_type = REGCACHE_RBTREE,
 };
 
+/* Dynamic driver private data */
 struct bd79703_data {
 	struct regmap *regmap;
 	int vfs;
 };
 
+/* Static, IC type specific data for different variants */
+struct bd7970x_chip_data {
+	const char *name;
+	const struct iio_chan_spec *channels;
+	int num_channels;
+};
+
 static int bd79703_read_raw(struct iio_dev *idev,
 			    struct iio_chan_spec const *chan, int *val,
 			    int *val2, long mask)
@@ -94,13 +102,24 @@ static const struct iio_chan_spec bd79703_channels[] = {
 	BD79703_CHAN(5),
 };
 
+static const struct bd7970x_chip_data bd79703_chip_data = {
+	.name = "bd79703",
+	.channels = bd79703_channels,
+	.num_channels = ARRAY_SIZE(bd79703_channels),
+};
+
 static int bd79703_probe(struct spi_device *spi)
 {
+	const struct bd7970x_chip_data *cd;
 	struct device *dev = &spi->dev;
 	struct bd79703_data *data;
 	struct iio_dev *idev;
 	int ret;
 
+	cd = spi_get_device_match_data(spi);
+	if (!cd)
+		return -ENODEV;
+
 	idev = devm_iio_device_alloc(dev, sizeof(*data));
 	if (!idev)
 		return -ENOMEM;
@@ -121,11 +140,11 @@ static int bd79703_probe(struct spi_device *spi)
 		return dev_err_probe(dev, ret, "Failed to get Vfs\n");
 
 	data->vfs = ret;
-	idev->channels = bd79703_channels;
-	idev->num_channels = ARRAY_SIZE(bd79703_channels);
+	idev->channels = cd->channels;
+	idev->num_channels = cd->num_channels;
 	idev->modes = INDIO_DIRECT_MODE;
 	idev->info = &bd79703_info;
-	idev->name = "bd79703";
+	idev->name = cd->name;
 
 	/* Initialize all to output zero */
 	ret = regmap_write(data->regmap, BD79703_REG_OUT_ALL, 0);
@@ -136,13 +155,13 @@ static int bd79703_probe(struct spi_device *spi)
 }
 
 static const struct spi_device_id bd79703_id[] = {
-	{ "bd79703", },
+	{ "bd79703", (kernel_ulong_t)&bd79703_chip_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(spi, bd79703_id);
 
 static const struct of_device_id bd79703_of_match[] = {
-	{ .compatible = "rohm,bd79703", },
+	{ .compatible = "rohm,bd79703", .data = &bd79703_chip_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, bd79703_of_match);
-- 
2.49.0


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