linux-kernel - [PATCH 3/7] iio: adc: adi-axi-adc: add interface type

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Message-ID: <20240923101206.3753-4-antoniu.miclaus@analog.com>
Date: Mon, 23 Sep 2024 13:10:20 +0300
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        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>,
        Uwe Kleine-König
	<ukleinek@...nel.org>,
        Andy Shevchenko <andy@...nel.org>,
        David Lechner
	<dlechner@...libre.com>,
        Marcelo Schmitt <marcelo.schmitt@...log.com>,
        Antoniu Miclaus <antoniu.miclaus@...log.com>,
        Dumitru Ceclan
	<mitrutzceclan@...il.com>,
        AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>,
        Alisa-Dariana Roman
	<alisadariana@...il.com>,
        Ivan Mikhaylov <fr0st61te@...il.com>,
        "Marius
 Cristea" <marius.cristea@...rochip.com>,
        João Paulo Gonçalves <joao.goncalves@...adex.com>,
        Sergiu Cuciurean <sergiu.cuciurean@...log.com>,
        Dragos Bogdan
	<dragos.bogdan@...log.com>, <linux-iio@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-pwm@...r.kernel.org>
Subject: [PATCH 3/7] iio: adc: adi-axi-adc: add interface type

Add support for getting the interface (CMOS or LVDS) used by the AXI ADC
ip.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
 drivers/iio/adc/adi-axi-adc.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
index 21ce7564e83d..ff48f26e02a3 100644
--- a/drivers/iio/adc/adi-axi-adc.c
+++ b/drivers/iio/adc/adi-axi-adc.c
@@ -39,6 +39,9 @@
 #define   ADI_AXI_REG_RSTN_MMCM_RSTN		BIT(1)
 #define   ADI_AXI_REG_RSTN_RSTN			BIT(0)
 
+#define ADI_AXI_ADC_REG_CONFIG			0x000c
+#define   ADI_AXI_ADC_REG_CONFIG_CMOS_OR_LVDS_N	BIT(7)
+
 #define ADI_AXI_ADC_REG_CTRL			0x0044
 #define    ADI_AXI_ADC_CTRL_DDR_EDGESEL_MASK	BIT(1)
 
@@ -249,6 +252,25 @@ static int axi_adc_chan_disable(struct iio_backend *back, unsigned int chan)
 				 ADI_AXI_REG_CHAN_CTRL_ENABLE);
 }
 
+static int axi_adc_interface_type_get(struct iio_backend *back,
+				      enum iio_backend_interface_type *type)
+{
+	struct adi_axi_adc_state *st = iio_backend_get_priv(back);
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(st->regmap, ADI_AXI_ADC_REG_CONFIG, &val);
+	if (ret)
+		return ret;
+
+	if (val & ADI_AXI_ADC_REG_CONFIG_CMOS_OR_LVDS_N)
+		*type = IIO_BACKEND_INTERFACE_CMOS;
+	else
+		*type = IIO_BACKEND_INTERFACE_LVDS;
+
+	return 0;
+}
+
 static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,
 						 struct iio_dev *indio_dev)
 {
@@ -285,6 +307,7 @@ static const struct iio_backend_ops adi_axi_adc_generic = {
 	.iodelay_set = axi_adc_iodelays_set,
 	.test_pattern_set = axi_adc_test_pattern_set,
 	.chan_status = axi_adc_chan_status,
+	.interface_type_get = axi_adc_interface_type_get,
 };
 
 static int adi_axi_adc_probe(struct platform_device *pdev)
-- 
2.46.0