[PATCH v4 03/10] iio: backend: add support for number of lanes

[Antoniu Miclaus <antoniu.miclaus@analog.com>]

Add iio backend support for number of lanes to be enabled.

Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
---
no changes in v4.
 drivers/iio/industrialio-backend.c | 17 +++++++++++++++++
 include/linux/iio/backend.h        |  3 +++
 2 files changed, 20 insertions(+)

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index b7cbbc7a8fcd..78a957d1fe92 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -810,6 +810,23 @@ int iio_backend_interface_data_align(struct iio_backend *back, u32 timeout)
 }
 EXPORT_SYMBOL_NS_GPL(iio_backend_interface_data_align, "IIO_BACKEND");
 
+/**
+ * iio_backend_num_lanes_set - Number of lanes enabled.
+ * @back: Backend device
+ * @num_lanes: Number of lanes.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_num_lanes_set(struct iio_backend *back, unsigned int num_lanes)
+{
+	if (!num_lanes)
+		return -EINVAL;
+
+	return iio_backend_op_call(back, num_lanes_set, num_lanes);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_num_lanes_set, "IIO_BACKEND");
+
 /**
  * iio_backend_ddr_enable - Enable interface DDR (Double Data Rate) mode
  * @back: Backend device
diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
index 452cb2838dad..1ffb200eb3ff 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -110,6 +110,7 @@ enum iio_backend_filter_type {
  * @debugfs_reg_access: Read or write register value of backend.
  * @filter_type_set: Set filter type.
  * @interface_data_align: Perform the data alignment process.
+ * @num_lanes_set: Set the number of lanes enabled.
  * @ddr_enable: Enable interface DDR (Double Data Rate) mode.
  * @ddr_disable: Disable interface DDR (Double Data Rate) mode.
  * @data_stream_enable: Enable data stream.
@@ -163,6 +164,7 @@ struct iio_backend_ops {
 	int (*filter_type_set)(struct iio_backend *back,
 			       enum iio_backend_filter_type type);
 	int (*interface_data_align)(struct iio_backend *back, u32 timeout);
+	int (*num_lanes_set)(struct iio_backend *back, unsigned int num_lanes);
 	int (*ddr_enable)(struct iio_backend *back);
 	int (*ddr_disable)(struct iio_backend *back);
 	int (*data_stream_enable)(struct iio_backend *back);
@@ -206,6 +208,7 @@ int devm_iio_backend_request_buffer(struct device *dev,
 int iio_backend_filter_type_set(struct iio_backend *back,
 				enum iio_backend_filter_type type);
 int iio_backend_interface_data_align(struct iio_backend *back, u32 timeout);
+int iio_backend_num_lanes_set(struct iio_backend *back, unsigned int num_lanes);
 int iio_backend_ddr_enable(struct iio_backend *back);
 int iio_backend_ddr_disable(struct iio_backend *back);
 int iio_backend_data_stream_enable(struct iio_backend *back);
-- 
2.49.0