[PATCH v4 14/15] iio: adc: xilinx-xadc: Add .setup_channels() to struct xadc_ops

[Dileep Kumar Nagavarapu <dileepkumar.nagavarapu@amd.com>]

Add .setup_channels() function pointer to struct xadc_ops to enable
different interfaces to have custom channel setup logic.

Export xadc_parse_dt() as it will be used by the I2C interface
support added later in this series. This avoids duplicating
the devicetree parsing logic across interface files.

Co-developed-by: Sai Krishna Potthuri <sai.krishna.potthuri@amd.com>
Signed-off-by: Sai Krishna Potthuri <sai.krishna.potthuri@amd.com>
Signed-off-by: Dileep Kumar Nagavarapu <dileepkumar.nagavarapu@amd.com>
---
 drivers/iio/adc/xilinx-xadc-core.c     | 6 ++++--
 drivers/iio/adc/xilinx-xadc-platform.c | 3 +++
 drivers/iio/adc/xilinx-xadc.h          | 2 ++
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index 878b4d9c7d73..2addb61cf5b1 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -658,7 +658,7 @@ static const struct iio_info xadc_info = {
 	.update_scan_mode = &xadc_update_scan_mode,
 };
 
-static int xadc_parse_dt(struct iio_dev *indio_dev, unsigned int *conf, int irq)
+int xadc_parse_dt(struct iio_dev *indio_dev, unsigned int *conf, int irq)
 {
 	struct device *dev = indio_dev->dev.parent;
 	struct xadc *xadc = iio_priv(indio_dev);
@@ -764,6 +764,7 @@ static int xadc_parse_dt(struct iio_dev *indio_dev, unsigned int *conf, int irq)
 
 	return 0;
 }
+EXPORT_SYMBOL_NS_GPL(xadc_parse_dt, "IIO_XADC");
 
 static const char *const xadc_type_names[] = {
 	[XADC_TYPE_S7] = "xadc",
@@ -793,9 +794,10 @@ EXPORT_SYMBOL_NS_GPL(xadc_device_setup, "IIO_XADC");
 int xadc_device_configure(struct iio_dev *indio_dev, int irq,
 			  unsigned int *conf0, unsigned int *bipolar_mask)
 {
+	struct xadc *xadc = iio_priv(indio_dev);
 	int ret;
 
-	ret = xadc_parse_dt(indio_dev, conf0, irq);
+	ret = xadc->ops->setup_channels(indio_dev, conf0, irq);
 	if (ret)
 		return ret;
 
diff --git a/drivers/iio/adc/xilinx-xadc-platform.c b/drivers/iio/adc/xilinx-xadc-platform.c
index b3fd86ead61d..72b127bd644e 100644
--- a/drivers/iio/adc/xilinx-xadc-platform.c
+++ b/drivers/iio/adc/xilinx-xadc-platform.c
@@ -386,6 +386,7 @@ static const struct xadc_ops xadc_zynq_ops = {
 	.get_dclk_rate = xadc_zynq_get_dclk_rate,
 	.interrupt_handler = xadc_zynq_interrupt_handler,
 	.update_alarm = xadc_zynq_update_alarm,
+	.setup_channels = xadc_parse_dt,
 	.type = XADC_TYPE_S7,
 	/* Temp in C = (val * 503.975) / 2**bits - 273.15 */
 	.temp_scale = 503975,
@@ -490,6 +491,7 @@ static const struct xadc_ops xadc_7s_axi_ops = {
 	.get_dclk_rate = xadc_axi_get_dclk,
 	.update_alarm = xadc_axi_update_alarm,
 	.interrupt_handler = xadc_axi_interrupt_handler,
+	.setup_channels = xadc_parse_dt,
 	.flags = XADC_FLAGS_BUFFERED | XADC_FLAGS_IRQ_OPTIONAL,
 	.type = XADC_TYPE_S7,
 	/* Temp in C = (val * 503.975) / 2**bits - 273.15 */
@@ -504,6 +506,7 @@ static const struct xadc_ops xadc_us_axi_ops = {
 	.get_dclk_rate = xadc_axi_get_dclk,
 	.update_alarm = xadc_axi_update_alarm,
 	.interrupt_handler = xadc_axi_interrupt_handler,
+	.setup_channels = xadc_parse_dt,
 	.flags = XADC_FLAGS_BUFFERED | XADC_FLAGS_IRQ_OPTIONAL,
 	.type = XADC_TYPE_US,
 	/**
diff --git a/drivers/iio/adc/xilinx-xadc.h b/drivers/iio/adc/xilinx-xadc.h
index 4793766687b4..66d333ad91ec 100644
--- a/drivers/iio/adc/xilinx-xadc.h
+++ b/drivers/iio/adc/xilinx-xadc.h
@@ -80,6 +80,7 @@ struct xadc_ops {
 	void (*update_alarm)(struct xadc *xadc, unsigned int alarm);
 	unsigned long (*get_dclk_rate)(struct xadc *xadc);
 	irqreturn_t (*interrupt_handler)(int irq, void *devid);
+	int (*setup_channels)(struct iio_dev *indio_dev, unsigned int *conf, int irq);
 
 	unsigned int flags;
 	enum xadc_type type;
@@ -191,6 +192,7 @@ static inline int xadc_write_adc_reg(struct xadc *xadc, unsigned int reg, u16 va
 void xadc_write_reg(struct xadc *xadc, unsigned int reg, u32 val);
 void xadc_read_reg(struct xadc *xadc, unsigned int reg, u32 *val);
 struct iio_dev *xadc_device_setup(struct device *dev, int size, const struct xadc_ops **ops);
+int xadc_parse_dt(struct iio_dev *indio_dev, unsigned int *conf, int irq);
 int xadc_device_configure(struct iio_dev *indio_dev,
 			  int irq, unsigned int *conf0, unsigned int *bipolar_mask);
 int xadc_read_samplerate(struct xadc *xadc);
-- 
2.34.1