1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2007 PA Semi, Inc
4  *
5  * Parts based on arch/powerpc/sysdev/fsl_soc.c:
6  *
7  * 2006 (c) MontaVista Software, Inc.
8  */
9 
10 #include <linux/errno.h>
11 #include <linux/kernel.h>
12 #include <linux/pci.h>
13 #include <linux/of.h>
14 #include <linux/i2c.h>
15 
16 #ifdef CONFIG_I2C_BOARDINFO
17 /* The below is from fsl_soc.c.  It's copied because since there are no
18  * official bus bindings at this time it doesn't make sense to share across
19  * the platforms, even though they happen to be common.
20  */
21 struct i2c_driver_device {
22 	char    *of_device;
23 	char    *i2c_type;
24 };
25 
26 static struct i2c_driver_device i2c_devices[] __initdata = {
27 	{"dallas,ds1338",  "ds1338"},
28 };
29 
30 static int __init find_i2c_driver(struct device_node *node,
31 				     struct i2c_board_info *info)
32 {
33 	int i;
34 
35 	for (i = 0; i < ARRAY_SIZE(i2c_devices); i++) {
36 		if (!of_device_is_compatible(node, i2c_devices[i].of_device))
37 			continue;
38 		if (strlcpy(info->type, i2c_devices[i].i2c_type,
39 			    I2C_NAME_SIZE) >= I2C_NAME_SIZE)
40 			return -ENOMEM;
41 		return 0;
42 	}
43 	return -ENODEV;
44 }
45 
46 static int __init pasemi_register_i2c_devices(void)
47 {
48 	struct pci_dev *pdev;
49 	struct device_node *adap_node;
50 	struct device_node *node;
51 
52 	pdev = NULL;
53 	while ((pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa003, pdev))) {
54 		adap_node = pci_device_to_OF_node(pdev);
55 
56 		if (!adap_node)
57 			continue;
58 
59 		for_each_child_of_node(adap_node, node) {
60 			struct i2c_board_info info = {};
61 			const u32 *addr;
62 			int len;
63 
64 			addr = of_get_property(node, "reg", &len);
65 			if (!addr || len < sizeof(int) ||
66 			    *addr > (1 << 10) - 1) {
67 				pr_warn("pasemi_register_i2c_devices: invalid i2c device entry\n");
68 				continue;
69 			}
70 
71 			info.irq = irq_of_parse_and_map(node, 0);
72 			if (!info.irq)
73 				info.irq = -1;
74 
75 			if (find_i2c_driver(node, &info) < 0)
76 				continue;
77 
78 			info.addr = *addr;
79 
80 			i2c_register_board_info(PCI_FUNC(pdev->devfn), &info,
81 						1);
82 		}
83 	}
84 	return 0;
85 }
86 device_initcall(pasemi_register_i2c_devices);
87 #endif
88