Unverified Commit 3fcd3d2f authored by David Lechner's avatar David Lechner Committed by Mark Brown
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spi: offload trigger: add ADI Util Sigma-Delta SPI driver 



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: default avatarDavid 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: default avatarMark Brown <broonie@kernel.org>
parent e47a324d

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

























drivers/spi/Kconfig



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−0






























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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
































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
























drivers/spi/spi-offload-trigger-adi-util-sigma-delta.c
0 → 100644



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// 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");