arch/powerpc/platforms/pasemi/misc.c

   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