arch/powerpc/platforms/pasemi/misc.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2007 PA Semi, Inc
 *
 * Parts based on arch/powerpc/sysdev/fsl_soc.c:
 *
 * 2006 (c) MontaVista Software, Inc.
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/of.h>
#include <linux/i2c.h>

#ifdef CONFIG_I2C_BOARDINFO
/* The below is from fsl_soc.c.  It's copied because since there are no
 * official bus bindings at this time it doesn't make sense to share across
 * the platforms, even though they happen to be common.
 */
struct i2c_driver_device {
	char    *of_device;
	char    *i2c_type;
};

static struct i2c_driver_device i2c_devices[] __initdata = {
	{"dallas,ds1338",  "ds1338"},
};

static int __init find_i2c_driver(struct device_node *node,
				     struct i2c_board_info *info)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(i2c_devices); i++) {
		if (!of_device_is_compatible(node, i2c_devices[i].of_device))
			continue;
		if (strlcpy(info->type, i2c_devices[i].i2c_type,
			    I2C_NAME_SIZE) >= I2C_NAME_SIZE)
			return -ENOMEM;
		return 0;
	}
	return -ENODEV;
}

static int __init pasemi_register_i2c_devices(void)
{
	struct pci_dev *pdev;
	struct device_node *adap_node;
	struct device_node *node;

	pdev = NULL;
	while ((pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa003, pdev))) {
		adap_node = pci_device_to_OF_node(pdev);

		if (!adap_node)
			continue;

		for_each_child_of_node(adap_node, node) {
			struct i2c_board_info info = {};
			const u32 *addr;
			int len;

			addr = of_get_property(node, "reg", &len);
			if (!addr || len < sizeof(int) ||
			    *addr > (1 << 10) - 1) {
				pr_warn("pasemi_register_i2c_devices: invalid i2c device entry\n");
				continue;
			}

			info.irq = irq_of_parse_and_map(node, 0);
			if (!info.irq)
				info.irq = -1;

			if (find_i2c_driver(node, &info) < 0)
				continue;

			info.addr = *addr;

			i2c_register_board_info(PCI_FUNC(pdev->devfn), &info,
						1);
		}
	}
	return 0;
}
device_initcall(pasemi_register_i2c_devices);
#endif