linux-kernel - [PATCH 9/9] iio: adc: ad7173: add SPI offload support

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Message-Id: <20250620-iio-adc-ad7173-add-spi-offload-support-v1-9-0766f6297430@baylibre.com>
Date: Fri, 20 Jun 2025 17:20:15 -0500
From: David Lechner <dlechner@...libre.com>
To: Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, 
 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>, Mark Brown <broonie@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-spi@...r.kernel.org, 
 David Lechner <dlechner@...libre.com>
Subject: [PATCH 9/9] iio: adc: ad7173: add SPI offload support

Enable SPI offload support for the AD7173 ADC driver.

The scan_type used for SPI offload is assuming that we are using the
ad411x_ad717x HDL project [1] which always stores data words in 32-bits.

Link: https://analogdevicesinc.github.io/hdl/projects/ad411x_ad717x/index.html [1]
Signed-off-by: David Lechner <dlechner@...libre.com>
---
 drivers/iio/adc/ad7173.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
index 010339c2b7044da4b36dc894a38a145c2fcccd6a..580d4bf3366b193fa0f13d0a28886d390e1295b8 100644
--- a/drivers/iio/adc/ad7173.c
+++ b/drivers/iio/adc/ad7173.c
@@ -748,6 +748,7 @@ static const struct ad_sigma_delta_info ad7173_sigma_delta_info_4_slots = {
 	.set_mode = ad7173_set_mode,
 	.has_registers = true,
 	.has_named_irqs = true,
+	.supports_spi_offload = true,
 	.addr_shift = 0,
 	.read_mask = BIT(6),
 	.status_ch_mask = GENMASK(3, 0),
@@ -764,6 +765,7 @@ static const struct ad_sigma_delta_info ad7173_sigma_delta_info_8_slots = {
 	.set_mode = ad7173_set_mode,
 	.has_registers = true,
 	.has_named_irqs = true,
+	.supports_spi_offload = true,
 	.addr_shift = 0,
 	.read_mask = BIT(6),
 	.status_ch_mask = GENMASK(3, 0),
@@ -1585,6 +1587,11 @@ static int ad7173_fw_parse_channel_config(struct iio_dev *indio_dev)
 		if (st->info->data_reg_only_16bit)
 			chan_arr[chan_index].scan_type = ad4113_scan_type;
 
+		if (ad_sigma_delta_has_spi_offload(&st->sd)) {
+			chan_arr[chan_index].scan_type.storagebits = 32;
+			chan_arr[chan_index].scan_type.endianness = IIO_CPU;
+		}
+
 		chan_index++;
 	}
 
@@ -1675,6 +1682,12 @@ static int ad7173_fw_parse_channel_config(struct iio_dev *indio_dev)
 		if (st->info->data_reg_only_16bit)
 			chan_arr[chan_index].scan_type = ad4113_scan_type;
 
+		/* Assuming SPI offload is ad411x_ad717x HDL project. */
+		if (ad_sigma_delta_has_spi_offload(&st->sd)) {
+			chan_arr[chan_index].scan_type.storagebits = 32;
+			chan_arr[chan_index].scan_type.endianness = IIO_CPU;
+		}
+
 		chan_index++;
 	}
 	return 0;

-- 
2.43.0