linux-kernel - [PATCH 2/5] iio: adc: adi-axi-adc: add set decimation rate

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Message-ID: <20250324090813.2775011-3-pop.ioan-daniel@analog.com>
Date: Mon, 24 Mar 2025 11:07:57 +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>,
        Marcelo Schmitt
	<marcelo.schmitt@...log.com>,
        Herve Codina <herve.codina@...tlin.com>,
        "Ramona Alexandra Nechita" <ramona.nechita@...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 2/5] iio: adc: adi-axi-adc: add set decimation rate

Add support for setting decimation rate.

Add separate compatible string for the custom AD7405 IP and implement
the necessary changes.

Signed-off-by: Pop Ioan Daniel <pop.ioan-daniel@...log.com>
---
 drivers/iio/adc/adi-axi-adc.c | 43 ++++++++++++++++++++++++++++++++++-
 1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index 766406f45396..0ed609e294ba 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -70,6 +70,9 @@
 #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	0x0424
+#define   ADI_AXI_ADC_DEC_RATE_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)
@@ -232,6 +235,16 @@ static int axi_adc_test_pattern_set(struct iio_backend *back,
 	}
 }
 
+static int axi_adc_set_dec_rate(struct iio_backend *back,
+				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),
+					      ADI_AXI_ADC_DEC_RATE_MASK,
+					      FIELD_PREP(ADI_AXI_ADC_DEC_RATE_MASK, rate));
+}
+
 static int axi_adc_read_chan_status(struct adi_axi_adc_state *st, unsigned int chan,
 				    unsigned int *status)
 {
@@ -465,6 +478,28 @@ static const struct iio_backend_info adi_axi_adc_generic = {
 	.ops = &adi_axi_adc_ops,
 };
 
+static const struct iio_backend_ops adi_ad7405_ops = {
+	.enable = axi_adc_enable,
+	.disable = axi_adc_disable,
+	.data_format_set = axi_adc_data_format_set,
+	.chan_enable = axi_adc_chan_enable,
+	.chan_disable = axi_adc_chan_disable,
+	.request_buffer = axi_adc_request_buffer,
+	.free_buffer = axi_adc_free_buffer,
+	.data_sample_trigger = axi_adc_data_sample_trigger,
+	.iodelay_set = axi_adc_iodelays_set,
+	.test_pattern_set = axi_adc_test_pattern_set,
+	.set_dec_rate = axi_adc_set_dec_rate,
+	.chan_status = axi_adc_chan_status,
+	.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),
+};
+
+static const struct iio_backend_info axi_ad7405 = {
+	.name = "axi-ad7405",
+	.ops = &adi_ad7405_ops,
+};
+
 static int adi_axi_adc_probe(struct platform_device *pdev)
 {
 	struct adi_axi_adc_state *st;
@@ -522,7 +557,7 @@ static int adi_axi_adc_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	ret = devm_iio_backend_register(&pdev->dev, &adi_axi_adc_generic, st);
+	ret = devm_iio_backend_register(&pdev->dev, st->info->backend_info, st);
 	if (ret)
 		return dev_err_probe(&pdev->dev, ret,
 				     "failed to register iio backend\n");
@@ -575,10 +610,16 @@ static const struct axi_adc_info adc_ad7606 = {
 	.has_child_nodes = true,
 };
 
+static const struct axi_adc_info adi_axi_ad7405 = {
+	.version = ADI_AXI_PCORE_VER(10, 0, 'a'),
+	.backend_info = &axi_ad7405,
+};
+
 /* Match table for of_platform binding */
 static const struct of_device_id adi_axi_adc_of_match[] = {
 	{ .compatible = "adi,axi-adc-10.0.a", .data = &adc_generic },
 	{ .compatible = "adi,axi-ad7606x", .data = &adc_ad7606 },
+	{ .compatible = "adi,axi-ad7405", .data = &adi_axi_ad7405},
 	{ /* end of list */ }
 };
 MODULE_DEVICE_TABLE(of, adi_axi_adc_of_match);
-- 
2.34.1