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/of_irq.h>
15 #include <linux/i2c.h>
16
17 #ifdef CONFIG_I2C_BOARDINFO
18 /* The below is from fsl_soc.c. It's copied because since there are no
19 * official bus bindings at this time it doesn't make sense to share across
20 * the platforms, even though they happen to be common.
21 */
22 struct i2c_driver_device {
23 char *of_device;
24 char *i2c_type;
25 };
26
27 static struct i2c_driver_device i2c_devices[] __initdata = {
28 {"dallas,ds1338", "ds1338"},
29 };
30
find_i2c_driver(struct device_node * node,struct i2c_board_info * info)31 static int __init find_i2c_driver(struct device_node *node,
32 struct i2c_board_info *info)
33 {
34 int i;
35
36 for (i = 0; i < ARRAY_SIZE(i2c_devices); i++) {
37 if (!of_device_is_compatible(node, i2c_devices[i].of_device))
38 continue;
39 if (strscpy(info->type, i2c_devices[i].i2c_type, I2C_NAME_SIZE) < 0)
40 return -ENOMEM;
41 return 0;
42 }
43 return -ENODEV;
44 }
45
pasemi_register_i2c_devices(void)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