an8855-efuse.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 *  Airoha AN8855 Switch EFUSE Driver
 4 */
 5
 6#include <linux/mod_devicetable.h>
 7#include <linux/module.h>
 8#include <linux/nvmem-provider.h>
 9#include <linux/platform_device.h>
10#include <linux/regmap.h>
11
12#define AN8855_EFUSE_CELL		50
13
14#define AN8855_EFUSE_DATA0		0x1000a500
15#define   AN8855_EFUSE_R50O		GENMASK(30, 24)
16
17static int an8855_efuse_read(void *context, unsigned int offset,
18			     void *val, size_t bytes)
19{
20	struct regmap *regmap = context;
21
22	return regmap_bulk_read(regmap, AN8855_EFUSE_DATA0 + offset,
23				val, bytes / sizeof(u32));
24}
25
26static int an8855_efuse_probe(struct platform_device *pdev)
27{
28	struct nvmem_config an8855_nvmem_config = {
29		.name = "an8855-efuse",
30		.size = AN8855_EFUSE_CELL * sizeof(u32),
31		.stride = sizeof(u32),
32		.word_size = sizeof(u32),
33		.reg_read = an8855_efuse_read,
34	};
35	struct device *dev = &pdev->dev;
36	struct nvmem_device *nvmem;
37	struct regmap *regmap;
38
39	/* Assign NVMEM priv to MFD regmap */
40	regmap = dev_get_regmap(dev->parent, NULL);
41	if (!regmap)
42		return -ENOENT;
43
44	an8855_nvmem_config.priv = regmap;
45	an8855_nvmem_config.dev = dev;
46	nvmem = devm_nvmem_register(dev, &an8855_nvmem_config);
47
48	return PTR_ERR_OR_ZERO(nvmem);
49}
50
51static const struct of_device_id an8855_efuse_of_match[] = {
52	{ .compatible = "airoha,an8855-efuse", },
53	{ /* sentinel */ }
54};
55MODULE_DEVICE_TABLE(of, an8855_efuse_of_match);
56
57static struct platform_driver an8855_efuse_driver = {
58	.probe = an8855_efuse_probe,
59	.driver = {
60		.name = "an8855-efuse",
61		.of_match_table = an8855_efuse_of_match,
62	},
63};
64module_platform_driver(an8855_efuse_driver);
65
66MODULE_AUTHOR("Christian Marangi <ansuelsmth@gmail.com>");
67MODULE_DESCRIPTION("Driver for AN8855 Switch EFUSE");
68MODULE_LICENSE("GPL");