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spi: offload trigger: add ADI Util Sigma-Delta SPI driver

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Add a new driver for the ADI Util Sigma-Delta SPI FPGA IP core.

This is used to trigger a SPI offload based on a RDY signal from an ADC
while masking out other signals on the same line.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20250627-iio-adc-ad7173-add-spi-offload-support-v2-9-f49c55599113@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
David Lechner 2025-06-27 18:40:05 -05:00 • committed by Mark Brown
parent e47a324d6f
commit 3fcd3d2fe4
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GPG key ID: 24D68B725D5487D0
4 changed files with 66 additions and 1 deletions
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2
MAINTAINERS
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@ -23413,7 +23413,7 @@ F: include/linux/mtd/spi-nor.h
SPI OFFLOAD
R: David Lechner <dlechner@baylibre.com>
F: drivers/spi/spi-offload-trigger-pwm.c
F: drivers/spi/spi-offload-trigger-*.c
F: drivers/spi/spi-offload.c
F: include/linux/spi/offload/
K: spi_offload

5
drivers/spi/Kconfig
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@ -1355,6 +1355,11 @@ if SPI_OFFLOAD
comment "SPI Offload triggers"
config SPI_OFFLOAD_TRIGGER_ADI_UTIL_SD
tristate "SPI offload trigger using ADI sigma-delta utility"
help
SPI offload trigger from ADI sigma-delta utility FPGA IP block.
config SPI_OFFLOAD_TRIGGER_PWM
tristate "SPI offload trigger using PWM"
depends on PWM

1
drivers/spi/Makefile
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@ -170,3 +170,4 @@ obj-$(CONFIG_SPI_SLAVE_SYSTEM_CONTROL) += spi-slave-system-control.o
# SPI offload triggers
obj-$(CONFIG_SPI_OFFLOAD_TRIGGER_PWM) += spi-offload-trigger-pwm.o
obj-$(CONFIG_SPI_OFFLOAD_TRIGGER_ADI_UTIL_SD) += spi-offload-trigger-adi-util-sigma-delta.o

59
drivers/spi/spi-offload-trigger-adi-util-sigma-delta.c Normal file
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@ -0,0 +1,59 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2025 Analog Devices Inc.
* Copyright (C) 2025 BayLibre, SAS
*/
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/spi/offload/provider.h>
static bool adi_util_sigma_delta_match(struct spi_offload_trigger *trigger,
enum spi_offload_trigger_type type,
u64 *args, u32 nargs)
{
return type == SPI_OFFLOAD_TRIGGER_DATA_READY && nargs == 0;
}
static const struct spi_offload_trigger_ops adi_util_sigma_delta_ops = {
.match = adi_util_sigma_delta_match,
};
static int adi_util_sigma_delta_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct spi_offload_trigger_info info = {
.fwnode = dev_fwnode(dev),
.ops = &adi_util_sigma_delta_ops,
};
struct clk *clk;
clk = devm_clk_get_enabled(dev, NULL);
if (IS_ERR(clk))
return dev_err_probe(dev, PTR_ERR(clk), "Failed to get clock\n");
return devm_spi_offload_trigger_register(dev, &info);
}
static const struct of_device_id adi_util_sigma_delta_of_match_table[] = {
{ .compatible = "adi,util-sigma-delta-spi", },
{ }
};
MODULE_DEVICE_TABLE(of, adi_util_sigma_delta_of_match_table);
static struct platform_driver adi_util_sigma_delta_driver = {
.probe = adi_util_sigma_delta_probe,
.driver = {
.name = "adi-util-sigma-delta-spi",
.of_match_table = adi_util_sigma_delta_of_match_table,
},
};
module_platform_driver(adi_util_sigma_delta_driver);
MODULE_AUTHOR("David Lechner <dlechner@baylibre.com>");
MODULE_DESCRIPTION("ADI Sigma-Delta SPI offload trigger utility driver");
MODULE_LICENSE("GPL");