linux-kernel - [PATCH v4 2/6] iio: backend: update iio_backend_oversampling_ratio

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Message-ID: <20250519140220.81489-3-pop.ioan-daniel@analog.com>
Date: Mon, 19 May 2025 17:02:10 +0300
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>,
        David
 Lechner <dlechner@...libre.com>,
        Nuno Sá
	<nuno.sa@...log.com>,
        Andy Shevchenko <andy@...nel.org>, Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Sergiu Cuciurean <sergiu.cuciurean@...log.com>,
        Dragos
 Bogdan <dragos.bogdan@...log.com>,
        Antoniu Miclaus
	<antoniu.miclaus@...log.com>,
        Olivier Moysan <olivier.moysan@...s.st.com>,
        Javier Carrasco <javier.carrasco.cruz@...il.com>,
        Matti Vaittinen
	<mazziesaccount@...il.com>,
        Tobias Sperling <tobias.sperling@...ting.com>,
        Alisa-Dariana Roman <alisadariana@...il.com>,
        Marcelo Schmitt
	<marcelo.schmitt@...log.com>,
        Herve Codina <herve.codina@...tlin.com>,
        Trevor
 Gamblin <tgamblin@...libre.com>,
        Thomas Bonnefille
	<thomas.bonnefille@...tlin.com>,
        Ioan Daniel <pop.ioan-daniel@...log.com>, <linux-iio@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v4 2/6] iio: backend: update iio_backend_oversampling_ratio_set

Add chan parameter to iio_backed_oversampling_ration_set() to allow
for contexts where the channel must be specified. Modify all
existing users.

Signed-off-by: Pop Ioan Daniel <pop.ioan-daniel@...log.com>
---
changes in v4:
 - pass 0 in the list of parameters instead of chan
 drivers/iio/adc/ad4851.c           | 4 ++--
 drivers/iio/industrialio-backend.c | 3 ++-
 include/linux/iio/backend.h        | 3 ++-
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/ad4851.c b/drivers/iio/adc/ad4851.c
index 12f90aa3a156..1f975858c496 100644
--- a/drivers/iio/adc/ad4851.c
+++ b/drivers/iio/adc/ad4851.c
@@ -319,8 +319,8 @@ static int ad4851_set_oversampling_ratio(struct iio_dev *indio_dev,
 		if (ret)
 			return ret;
 	}
-
-	ret = iio_backend_oversampling_ratio_set(st->back, osr);
+	/* Channel is ignored by the backend being used here */
+	ret = iio_backend_oversampling_ratio_set(st->back, 0, osr);
 	if (ret)
 		return ret;
 
diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
index c1eb9ef9db08..a4e3e54fecb1 100644
--- a/drivers/iio/industrialio-backend.c
+++ b/drivers/iio/industrialio-backend.c
@@ -720,9 +720,10 @@ EXPORT_SYMBOL_NS_GPL(iio_backend_data_size_set, "IIO_BACKEND");
  * 0 on success, negative error number on failure.
  */
 int iio_backend_oversampling_ratio_set(struct iio_backend *back,
+				       unsigned int chan,
 				       unsigned int ratio)
 {
-	return iio_backend_op_call(back, oversampling_ratio_set, ratio);
+	return iio_backend_op_call(back, oversampling_ratio_set, chan, ratio);
 }
 EXPORT_SYMBOL_NS_GPL(iio_backend_oversampling_ratio_set, "IIO_BACKEND");
 
diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
index e59d909cb659..dbf4e4a5f4b1 100644
--- a/include/linux/iio/backend.h
+++ b/include/linux/iio/backend.h
@@ -144,7 +144,7 @@ struct iio_backend_ops {
 				  enum iio_backend_interface_type *type);
 	int (*data_size_set)(struct iio_backend *back, unsigned int size);
 	int (*oversampling_ratio_set)(struct iio_backend *back,
-				      unsigned int ratio);
+				      unsigned int chan, unsigned int ratio);
 	int (*read_raw)(struct iio_backend *back,
 			struct iio_chan_spec const *chan, int *val, int *val2,
 			long mask);
@@ -209,6 +209,7 @@ int iio_backend_interface_type_get(struct iio_backend *back,
 				   enum iio_backend_interface_type *type);
 int iio_backend_data_size_set(struct iio_backend *back, unsigned int size);
 int iio_backend_oversampling_ratio_set(struct iio_backend *back,
+				       unsigned int chan,
 				       unsigned int ratio);
 int iio_backend_read_raw(struct iio_backend *back,
 			 struct iio_chan_spec const *chan, int *val, int *val2,
-- 
2.34.1