linux-kernel - [PATCH v8 6/8] iio: adc: adi-axi-adc: add oversampling

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Message-ID: <20241213164445.23195-6-antoniu.miclaus@analog.com>
Date: Fri, 13 Dec 2024 18:44:43 +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>, <linux-pwm@...r.kernel.org>
CC: Antoniu Miclaus <antoniu.miclaus@...log.com>
Subject: [PATCH v8 6/8] iio: adc: adi-axi-adc: add oversampling

Add support for enabling/disabling oversampling.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
changes in v8:
 - use oversampling ratio set.
 drivers/iio/adc/adi-axi-adc.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index 9a3968769512..24d530789e4c 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -46,6 +46,7 @@
 #define    ADI_AXI_ADC_CTRL_DDR_EDGESEL_MASK	BIT(1)
 
 #define ADI_AXI_ADC_REG_CNTRL_3			0x004c
+#define   AD485X_CNTRL_3_CUSTOM_CTRL_OS_EN_MSK	BIT(2)
 #define   AD485X_CNTRL_3_CUSTOM_CTRL_PACKET_FORMAT_MSK	GENMASK(1, 0)
 #define   AD485X_PACKET_FORMAT_20BIT		0x0
 #define   AD485X_PACKET_FORMAT_24BIT		0x1
@@ -357,6 +358,23 @@ static int axi_adc_data_size_set(struct iio_backend *back, unsigned int size)
 				  FIELD_PREP(AD485X_CNTRL_3_CUSTOM_CTRL_PACKET_FORMAT_MSK, val));
 }
 
+static int axi_adc_oversampling_ratio_set(struct iio_backend *back,
+					  unsigned int ratio)
+{
+	struct adi_axi_adc_state *st = iio_backend_get_priv(back);
+
+	switch (ratio) {
+	case 0:
+		return -EINVAL;
+	case 1:
+		return regmap_clear_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
+					 AD485X_CNTRL_3_CUSTOM_CTRL_OS_EN_MSK);
+	default:
+		return regmap_set_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
+				       AD485X_CNTRL_3_CUSTOM_CTRL_OS_EN_MSK);
+	}
+}
+
 static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,
 						 struct iio_dev *indio_dev)
 {
@@ -406,6 +424,7 @@ static const struct iio_backend_ops adi_axi_adc_ops = {
 	.chan_status = axi_adc_chan_status,
 	.interface_type_get = axi_adc_interface_type_get,
 	.data_size_set = axi_adc_data_size_set,
+	.oversampling_ratio_set = axi_adc_oversampling_ratio_set,
 	.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),
 };
-- 
2.47.1