linux-kernel - [PATCH v2 2/4] iio: adc: adi-axi-adc: add set decimation rate

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Message-ID: <20250508123107.3797042-3-pop.ioan-daniel@analog.com>
Date: Thu, 8 May 2025 15:30:55 +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>,
        Marcelo Schmitt <marcelo.schmitt@...log.com>,
        Alisa-Dariana Roman
	<alisadariana@...il.com>,
        Esteban Blanc <eblanc@...libre.com>,
        Ioan Daniel
	<pop.ioan-daniel@...log.com>, <linux-iio@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 2/4] iio: adc: adi-axi-adc: add set decimation rate

Add support for setting decimation rate.

Signed-off-by: Pop Ioan Daniel <pop.ioan-daniel@...log.com>
---
changes in v2:
 - update ADI_AXI_ADC_REG_CHAN_USR_CTRL_2 register in a per-channel register
 - rename ADI_AXI_ADC_DEC_RATE_MASK in
   ADI_AXI_ADC_CHAN_USR_CTRL_2_DEC_RATE_N_MASK
 - add channel index parameter to keep axi_adc_set_dec_rate generic
 - remove ad7405 chip-specific struct
 drivers/iio/adc/adi-axi-adc.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index 9e8c30230791..33eb8f337e0b 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -80,6 +80,9 @@
 #define ADI_AXI_ADC_REG_CHAN_CTRL_3(c)		(0x0418 + (c) * 0x40)
 #define   ADI_AXI_ADC_CHAN_PN_SEL_MASK		GENMASK(19, 16)
 
+#define ADI_AXI_ADC_REG_CHAN_USR_CTRL_2(c)	(0x0424 + (c) * 0x40)
+#define   ADI_AXI_ADC_CHAN_USR_CTRL_2_DEC_RATE_N_MASK		GENMASK(15, 0)
+
 /* IO Delays */
 #define ADI_AXI_ADC_REG_DELAY(l)		(0x0800 + (l) * 0x4)
 #define   AXI_ADC_DELAY_CTRL_MASK		GENMASK(4, 0)
@@ -242,6 +245,17 @@ static int axi_adc_test_pattern_set(struct iio_backend *back,
 	}
 }
 
+static int axi_adc_set_dec_rate(struct iio_backend *back, unsigned int chan,
+				unsigned int rate)
+{
+	struct adi_axi_adc_state *st = iio_backend_get_priv(back);
+
+	return regmap_update_bits(st->regmap,
+				  ADI_AXI_ADC_REG_CHAN_USR_CTRL_2(chan),
+				  ADI_AXI_ADC_CHAN_USR_CTRL_2_DEC_RATE_N_MASK,
+				  FIELD_PREP(ADI_AXI_ADC_CHAN_USR_CTRL_2_DEC_RATE_N_MASK, rate));
+}
+
 static int axi_adc_read_chan_status(struct adi_axi_adc_state *st, unsigned int chan,
 				    unsigned int *status)
 {
@@ -550,6 +564,7 @@ static const struct iio_backend_ops adi_axi_adc_ops = {
 	.test_pattern_set = axi_adc_test_pattern_set,
 	.chan_status = axi_adc_chan_status,
 	.interface_type_get = axi_adc_interface_type_get,
+	.oversampling_ratio_set = axi_adc_set_dec_rate,
 	.debugfs_reg_access = iio_backend_debugfs_ptr(axi_adc_reg_access),
 	.debugfs_print_chan_status = iio_backend_debugfs_ptr(axi_adc_debugfs_print_chan_status),
 };
-- 
2.34.1