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