spi-offload-trigger-adi-util-sigma-delta.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (C) 2025 Analog Devices Inc.
 4 * Copyright (C) 2025 BayLibre, SAS
 5 */
 6
 7#include <linux/clk.h>
 8#include <linux/dev_printk.h>
 9#include <linux/err.h>
10#include <linux/mod_devicetable.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/property.h>
14#include <linux/spi/offload/provider.h>
15#include <linux/spi/offload/types.h>
16#include <linux/types.h>
17
18static bool adi_util_sigma_delta_match(struct spi_offload_trigger *trigger,
19				       enum spi_offload_trigger_type type,
20				       u64 *args, u32 nargs)
21{
22	return type == SPI_OFFLOAD_TRIGGER_DATA_READY && nargs == 0;
23}
24
25static const struct spi_offload_trigger_ops adi_util_sigma_delta_ops = {
26	.match = adi_util_sigma_delta_match,
27};
28
29static int adi_util_sigma_delta_probe(struct platform_device *pdev)
30{
31	struct device *dev = &pdev->dev;
32	struct spi_offload_trigger_info info = {
33		.fwnode = dev_fwnode(dev),
34		.ops = &adi_util_sigma_delta_ops,
35	};
36	struct clk *clk;
37
38	clk = devm_clk_get_enabled(dev, NULL);
39	if (IS_ERR(clk))
40		return dev_err_probe(dev, PTR_ERR(clk), "Failed to get clock\n");
41
42	return devm_spi_offload_trigger_register(dev, &info);
43}
44
45static const struct of_device_id adi_util_sigma_delta_of_match_table[] = {
46	{ .compatible = "adi,util-sigma-delta-spi", },
47	{ }
48};
49MODULE_DEVICE_TABLE(of, adi_util_sigma_delta_of_match_table);
50
51static struct platform_driver adi_util_sigma_delta_driver = {
52	.probe  = adi_util_sigma_delta_probe,
53	.driver = {
54		.name = "adi-util-sigma-delta-spi",
55		.of_match_table = adi_util_sigma_delta_of_match_table,
56	},
57};
58module_platform_driver(adi_util_sigma_delta_driver);
59
60MODULE_AUTHOR("David Lechner <dlechner@baylibre.com>");
61MODULE_DESCRIPTION("ADI Sigma-Delta SPI offload trigger utility driver");
62MODULE_LICENSE("GPL");