[PATCH] iio: adc: rzg2l_adc: Add support for RZ/G2UL ADC

[Biju Das <biju.das.jz@xxxxxxxxxxxxxx>]

ADC found on RZ/G2UL SoC is almost identical to RZ/G2L SoC, but RZ/G2UL
has 2 analog input channels compared to 8 channels on RZ/G2L. Therefore,
added a new compatible to handle this difference.

Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
---
 drivers/iio/adc/rzg2l_adc.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/adc/rzg2l_adc.c b/drivers/iio/adc/rzg2l_adc.c
index 7585144b9715..703b08254c9f 100644
--- a/drivers/iio/adc/rzg2l_adc.c
+++ b/drivers/iio/adc/rzg2l_adc.c
@@ -16,6 +16,7 @@
 #include <linux/io.h>
 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
+#include <linux/of_device.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/reset.h>
@@ -61,6 +62,8 @@
 #define RZG2L_ADC_CHN_MASK		0x7
 #define RZG2L_ADC_TIMEOUT		usecs_to_jiffies(1 * 4)
 
+#define RZG2UL_ADC_MAX_CHANNELS		2
+
 struct rzg2l_adc_data {
 	const struct iio_chan_spec *channels;
 	u8 num_channels;
@@ -76,6 +79,7 @@ struct rzg2l_adc {
 	const struct rzg2l_adc_data *data;
 	struct mutex lock;
 	u16 last_val[RZG2L_ADC_MAX_CHANNELS];
+	u8 max_channels;
 };
 
 static const char * const rzg2l_adc_channel_name[] = {
@@ -260,7 +264,9 @@ static int rzg2l_adc_read_label(struct iio_dev *iio_dev,
 				const struct iio_chan_spec *chan,
 				char *label)
 {
-	if (chan->channel >= RZG2L_ADC_MAX_CHANNELS)
+	struct rzg2l_adc *adc = iio_priv(iio_dev);
+
+	if (chan->channel >= adc->max_channels)
 		return -EINVAL;
 
 	return sysfs_emit(label, "%s\n", rzg2l_adc_channel_name[chan->channel]);
@@ -290,7 +296,7 @@ static irqreturn_t rzg2l_adc_isr(int irq, void *dev_id)
 	if (!intst)
 		return IRQ_NONE;
 
-	for_each_set_bit(ch, &intst, RZG2L_ADC_MAX_CHANNELS)
+	for_each_set_bit(ch, &intst, adc->max_channels)
 		adc->last_val[ch] = rzg2l_adc_readl(adc, RZG2L_ADCR(ch)) & RZG2L_ADCR_AD_MASK;
 
 	/* clear the channel interrupt */
@@ -321,7 +327,7 @@ static int rzg2l_adc_parse_properties(struct platform_device *pdev, struct rzg2l
 		return -ENODEV;
 	}
 
-	if (num_channels > RZG2L_ADC_MAX_CHANNELS) {
+	if (num_channels > adc->max_channels) {
 		dev_err(&pdev->dev, "num of channel children out of range\n");
 		return -EINVAL;
 	}
@@ -337,7 +343,7 @@ static int rzg2l_adc_parse_properties(struct platform_device *pdev, struct rzg2l
 		if (ret)
 			return ret;
 
-		if (channel >= RZG2L_ADC_MAX_CHANNELS)
+		if (channel >= adc->max_channels)
 			return -EINVAL;
 
 		chan_array[i].type = IIO_VOLTAGE;
@@ -437,6 +443,7 @@ static int rzg2l_adc_probe(struct platform_device *pdev)
 
 	adc = iio_priv(indio_dev);
 
+	adc->max_channels = (uintptr_t)of_device_get_match_data(dev);
 	ret = rzg2l_adc_parse_properties(pdev, adc);
 	if (ret)
 		return ret;
@@ -540,7 +547,8 @@ static int rzg2l_adc_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id rzg2l_adc_match[] = {
-	{ .compatible = "renesas,rzg2l-adc",},
+	{ .compatible = "renesas,r9a07g043-adc", .data = (void *)RZG2UL_ADC_MAX_CHANNELS },
+	{ .compatible = "renesas,rzg2l-adc", .data = (void *)RZG2L_ADC_MAX_CHANNELS },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, rzg2l_adc_match);
-- 
2.25.1