linux-kernel - [PATCH 1/5] iio: backend: add support for decimation ratio set

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Message-ID: <20250324090813.2775011-2-pop.ioan-daniel@analog.com>
Date: Mon, 24 Mar 2025 11:07:56 +0200
From: Pop Ioan Daniel <pop.ioan-daniel@...log.com>
To: Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich
	<Michael.Hennerich@...log.com>,
        Jonathan Cameron <jic23@...nel.org>, Rob
 Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor
 Dooley <conor+dt@...nel.org>, Nuno Sa <nuno.sa@...log.com>,
        Olivier Moysan
	<olivier.moysan@...s.st.com>,
        David Lechner <dlechner@...libre.com>,
        Javier
 Carrasco <javier.carrasco.cruz@...il.com>,
        Andy Shevchenko
	<andriy.shevchenko@...ux.intel.com>,
        Guillaume Stols <gstols@...libre.com>,
        Trevor Gamblin <tgamblin@...libre.com>,
        Dumitru Ceclan
	<mitrutzceclan@...il.com>,
        Matteo Martelli <matteomartelli3@...il.com>,
        João Paulo Gonçalves <joao.goncalves@...adex.com>,
        Alisa-Dariana Roman <alisadariana@...il.com>,
        Thomas Bonnefille
	<thomas.bonnefille@...tlin.com>,
        Herve Codina <herve.codina@...tlin.com>,
        Marcelo Schmitt <marcelo.schmitt@...log.com>,
        Dragos Bogdan
	<dragos.bogdan@...log.com>, <linux-iio@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: Pop Ioan Daniel <pop.ioan-daniel@...log.com>
Subject: [PATCH 1/5] iio: backend: add support for decimation ratio set

Add backend support for setting the decimation ratio used.

Signed-off-by: Pop Ioan Daniel <pop.ioan-daniel@...log.com>
---
 drivers/iio/industrialio-backend.c | 18 ++++++++++++++++++
 include/linux/iio/backend.h        |  3 +++
 2 files changed, 21 insertions(+)

diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index 363281272035..f4db6514944a 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -417,6 +417,24 @@ int iio_backend_test_pattern_set(struct iio_backend *back,
 }
 EXPORT_SYMBOL_NS_GPL(iio_backend_test_pattern_set, "IIO_BACKEND");
 
+/**
+ * iio_backend_set_dec_rate - set decimation ratio
+ * @back: Backend device
+ * @rate: Rate in decimal
+
+ * Return:
+ * 0 on success, negative error number on failure.
+ */
+
+int iio_backend_set_dec_rate(struct iio_backend *back, unsigned int rate)
+{
+	if (!rate)
+		return -EINVAL;
+
+	return iio_backend_op_call(back, set_dec_rate, rate);
+}
+EXPORT_SYMBOL_NS_GPL(iio_backend_set_dec_rate, "IIO_BACKEND");
+
 /**
  * iio_backend_chan_status - Get the channel status
  * @back: Backend device
diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
index 10be00f3b120..e73d7d265a16 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -80,6 +80,7 @@ enum iio_backend_sample_trigger {
  * @data_source_set: Configure the data source for a specific channel.
  * @set_sample_rate: Configure the sampling rate for a specific channel.
  * @test_pattern_set: Configure a test pattern.
+ * @set_dec_rate: Set decimation ratio
  * @chan_status: Get the channel status.
  * @iodelay_set: Set digital I/O delay.
  * @data_sample_trigger: Control when to sample data.
@@ -111,6 +112,7 @@ struct iio_backend_ops {
 	int (*test_pattern_set)(struct iio_backend *back,
 				unsigned int chan,
 				enum iio_backend_test_pattern pattern);
+	int (*set_dec_rate)(struct iio_backend *back, unsigned int rate);
 	int (*chan_status)(struct iio_backend *back, unsigned int chan,
 			   bool *error);
 	int (*iodelay_set)(struct iio_backend *back, unsigned int chan,
@@ -167,6 +169,7 @@ int iio_backend_set_sampling_freq(struct iio_backend *back, unsigned int chan,
 int iio_backend_test_pattern_set(struct iio_backend *back,
 				 unsigned int chan,
 				 enum iio_backend_test_pattern pattern);
+int iio_backend_set_dec_rate(struct iio_backend *back, unsigned int rate);
 int iio_backend_chan_status(struct iio_backend *back, unsigned int chan,
 			    bool *error);
 int iio_backend_iodelay_set(struct iio_backend *back, unsigned int lane,
-- 
2.34.1