linux-kernel - [PATCH 03/14] iio: backend: add support for self sync

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Message-ID: <20250220135429.8615-4-antoniu.miclaus@analog.com>
Date: Thu, 20 Feb 2025 15:54:13 +0200
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: <jic23@...nel.org>, <robh@...nel.org>, <conor+dt@...nel.org>,
        <linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: Antoniu Miclaus <antoniu.miclaus@...log.com>
Subject: [PATCH 03/14] iio: backend: add support for self sync

Add iio backend support for self sync enable/disable.
When disabled data capture synchronization is done
through CNV signal, otherwise through bit-slip.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
 drivers/iio/industrialio-backend.c | 30 ++++++++++++++++++++++++++++++
 include/linux/iio/backend.h        |  6 ++++++
 2 files changed, 36 insertions(+)

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index b01db8a65b1c..a81780f569e3 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -830,6 +830,36 @@ int iio_backend_bitslip_disable(struct iio_backend *back)
 }
 EXPORT_SYMBOL_NS_GPL(iio_backend_bitslip_disable, "IIO_BACKEND");
 
+/**
+ * iio_backend_self_sync_enable - Enable the self sync data capture.
+ * @back: Backend device
+ *
+ * Data capture synchronization is done through bit-slip.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_self_sync_enable(struct iio_backend *back)
+{
+	return iio_backend_op_call(back, self_sync_enable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_self_sync_enable, "IIO_BACKEND");
+
+/**
+ * iio_backend_self_sync_disable - Disable the self sync data capture.
+ * @back: Backend device
+ *
+ * Data capture synchronization is done through CNV signal.
+ *
+ * RETURNS:
+ * 0 on success, negative error number on failure.
+ */
+int iio_backend_self_sync_disable(struct iio_backend *back)
+{
+	return iio_backend_op_call(back, self_sync_disable);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_self_sync_disable, "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 c7b4631b524c..8e663c838974 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -104,6 +104,8 @@ enum iio_backend_interface_type {
  * @filter_disable: Disable filter.
  * @bitslip_enable: Enable sync process.
  * @bitslip_disable: Disable sync process.
+ * @self_sync_enable: Enable the self sync data capture.
+ * @self_sync_disable: Disable the self sync data capture.
  * @ddr_enable: Enable interface DDR (Double Data Rate) mode.
  * @ddr_disable: Disable interface DDR (Double Data Rate) mode.
  * @data_stream_enable: Enable data stream.
@@ -158,6 +160,8 @@ struct iio_backend_ops {
 	int (*filter_disable)(struct iio_backend *back);
 	int (*bitslip_enable)(struct iio_backend *back);
 	int (*bitslip_disable)(struct iio_backend *back);
+	int (*self_sync_enable)(struct iio_backend *back);
+	int (*self_sync_disable)(struct iio_backend *back);
 	int (*ddr_enable)(struct iio_backend *back);
 	int (*ddr_disable)(struct iio_backend *back);
 	int (*data_stream_enable)(struct iio_backend *back);
@@ -202,6 +206,8 @@ int iio_backend_filter_enable(struct iio_backend *back);
 int iio_backend_filter_disable(struct iio_backend *back);
 int iio_backend_bitslip_enable(struct iio_backend *back);
 int iio_backend_bitslip_disable(struct iio_backend *back);
+int iio_backend_self_sync_enable(struct iio_backend *back);
+int iio_backend_self_sync_disable(struct iio_backend *back);
 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);
-- 
2.48.1