iio: adc: ad7192: Convert from of specific to fwnode property handling

Enables use of with other firmwware types.
Removes a case of device tree specific handlers that might get copied
into new drivers.

Cc: Alisa-Dariana Roman <alisa.roman@analog.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240218172731.1023367-6-jic23@kernel.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/adc/ad7192.c

@@ -17,7 +17,9 @@
 #include <linux/err.h>
 #include <linux/sched.h>
 #include <linux/delay.h>
-#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/property.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
@@ -364,19 +366,19 @@ static inline bool ad7192_valid_external_frequency(u32 freq)
 		freq <= AD7192_EXT_FREQ_MHZ_MAX);
 }
 
-static int ad7192_of_clock_select(struct ad7192_state *st)
+static int ad7192_clock_select(struct ad7192_state *st)
 {
-	struct device_node *np = st->sd.spi->dev.of_node;
+	struct device *dev = &st->sd.spi->dev;
 	unsigned int clock_sel;
 
 	clock_sel = AD7192_CLK_INT;
 
 	/* use internal clock */
 	if (!st->mclk) {
-		if (of_property_read_bool(np, "adi,int-clock-output-enable"))
+		if (device_property_read_bool(dev, "adi,int-clock-output-enable"))
 			clock_sel = AD7192_CLK_INT_CO;
 	} else {
-		if (of_property_read_bool(np, "adi,clock-xtal"))
+		if (device_property_read_bool(dev, "adi,clock-xtal"))
 			clock_sel = AD7192_CLK_EXT_MCLK1_2;
 		else
 			clock_sel = AD7192_CLK_EXT_MCLK2;
@@ -385,7 +387,7 @@ static int ad7192_of_clock_select(struct ad7192_state *st)
 	return clock_sel;
 }
 
-static int ad7192_setup(struct iio_dev *indio_dev, struct device_node *np)
+static int ad7192_setup(struct iio_dev *indio_dev, struct device *dev)
 {
 	struct ad7192_state *st = iio_priv(indio_dev);
 	bool rej60_en, refin2_en;
@@ -407,7 +409,7 @@ static int ad7192_setup(struct iio_dev *indio_dev, struct device_node *np)
 	id = FIELD_GET(AD7192_ID_MASK, id);
 
 	if (id != st->chip_info->chip_id)
-		dev_warn(&st->sd.spi->dev, "device ID query failed (0x%X != 0x%X)\n",
+		dev_warn(dev, "device ID query failed (0x%X != 0x%X)\n",
 			 id, st->chip_info->chip_id);
 
 	st->mode = FIELD_PREP(AD7192_MODE_SEL_MASK, AD7192_MODE_IDLE) |
@@ -416,30 +418,30 @@ static int ad7192_setup(struct iio_dev *indio_dev, struct device_node *np)
 
 	st->conf = FIELD_PREP(AD7192_CONF_GAIN_MASK, 0);
 
-	rej60_en = of_property_read_bool(np, "adi,rejection-60-Hz-enable");
+	rej60_en = device_property_read_bool(dev, "adi,rejection-60-Hz-enable");
 	if (rej60_en)
 		st->mode |= AD7192_MODE_REJ60;
 
-	refin2_en = of_property_read_bool(np, "adi,refin2-pins-enable");
+	refin2_en = device_property_read_bool(dev, "adi,refin2-pins-enable");
 	if (refin2_en && st->chip_info->chip_id != CHIPID_AD7195)
 		st->conf |= AD7192_CONF_REFSEL;
 
 	st->conf &= ~AD7192_CONF_CHOP;
 
-	buf_en = of_property_read_bool(np, "adi,buffer-enable");
+	buf_en = device_property_read_bool(dev, "adi,buffer-enable");
 	if (buf_en)
 		st->conf |= AD7192_CONF_BUF;
 
-	bipolar = of_property_read_bool(np, "bipolar");
+	bipolar = device_property_read_bool(dev, "bipolar");
 	if (!bipolar)
 		st->conf |= AD7192_CONF_UNIPOLAR;
 
-	burnout_curr_en = of_property_read_bool(np,
-						"adi,burnout-currents-enable");
+	burnout_curr_en = device_property_read_bool(dev,
+						    "adi,burnout-currents-enable");
 	if (burnout_curr_en && buf_en) {
 		st->conf |= AD7192_CONF_BURN;
 	} else if (burnout_curr_en) {
-		dev_warn(&st->sd.spi->dev,
+		dev_warn(dev,
 			 "Can't enable burnout currents: see CHOP or buffer\n");
 	}
 
@@ -1117,9 +1119,7 @@ static int ad7192_probe(struct spi_device *spi)
 	}
 	st->int_vref_mv = ret / 1000;
 
-	st->chip_info = of_device_get_match_data(&spi->dev);
-	if (!st->chip_info)
-		st->chip_info = (void *)spi_get_device_id(spi)->driver_data;
+	st->chip_info = spi_get_device_match_data(spi);
 	indio_dev->name = st->chip_info->name;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->channels = st->chip_info->channels;
@@ -1140,7 +1140,7 @@ static int ad7192_probe(struct spi_device *spi)
 	if (IS_ERR(st->mclk))
 		return PTR_ERR(st->mclk);
 
-	st->clock_sel = ad7192_of_clock_select(st);
+	st->clock_sel = ad7192_clock_select(st);
 
 	if (st->clock_sel == AD7192_CLK_EXT_MCLK1_2 ||
 	    st->clock_sel == AD7192_CLK_EXT_MCLK2) {
@@ -1152,7 +1152,7 @@ static int ad7192_probe(struct spi_device *spi)
 		}
 	}
 
-	ret = ad7192_setup(indio_dev, spi->dev.of_node);
+	ret = ad7192_setup(indio_dev, &spi->dev);
 	if (ret)
 		return ret;