1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  CLPS711X GPIO driver
4 *
5 *  Copyright (C) 2012,2013 Alexander Shiyan <shc_work@mail.ru>
6 */
7
8#include <linux/err.h>
9#include <linux/module.h>
10#include <linux/gpio/driver.h>
11#include <linux/platform_device.h>
12
13static int clps711x_gpio_probe(struct platform_device *pdev)
14{
15	struct device_node *np = pdev->dev.of_node;
16	void __iomem *dat, *dir;
17	struct gpio_chip *gc;
18	int err, id;
19
20	if (!np)
21		return -ENODEV;
22
23	id = of_alias_get_id(np, "gpio");
24	if ((id < 0) || (id > 4))
25		return -ENODEV;
26
27	gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL);
28	if (!gc)
29		return -ENOMEM;
30
31	dat = devm_platform_ioremap_resource(pdev, 0);
32	if (IS_ERR(dat))
33		return PTR_ERR(dat);
34
35	dir = devm_platform_ioremap_resource(pdev, 1);
36	if (IS_ERR(dir))
37		return PTR_ERR(dir);
38
39	switch (id) {
40	case 3:
41		/* PORTD is inverted logic for direction register */
42		err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
43				 NULL, dir, 0);
44		break;
45	default:
46		err = bgpio_init(gc, &pdev->dev, 1, dat, NULL, NULL,
47				 dir, NULL, 0);
48		break;
49	}
50
51	if (err)
52		return err;
53
54	switch (id) {
55	case 4:
56		/* PORTE is 3 lines only */
57		gc->ngpio = 3;
58		break;
59	default:
60		break;
61	}
62
63	gc->base = -1;
64	gc->owner = THIS_MODULE;
65	platform_set_drvdata(pdev, gc);
66
67	return devm_gpiochip_add_data(&pdev->dev, gc, NULL);
68}
69
70static const struct of_device_id clps711x_gpio_ids[] = {
71	{ .compatible = "cirrus,ep7209-gpio" },
72	{ }
73};
74MODULE_DEVICE_TABLE(of, clps711x_gpio_ids);
75
76static struct platform_driver clps711x_gpio_driver = {
77	.driver	= {
78		.name		= "clps711x-gpio",
79		.of_match_table	= clps711x_gpio_ids,
80	},
81	.probe	= clps711x_gpio_probe,
82};
83module_platform_driver(clps711x_gpio_driver);
84
85MODULE_LICENSE("GPL");
86MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
87MODULE_DESCRIPTION("CLPS711X GPIO driver");
88MODULE_ALIAS("platform:clps711x-gpio");
89