1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
12 #include <dm/device-internal.h>
15 #include <linux/err.h>
17 struct regmap *syscon_get_regmap(struct udevice *dev)
19 struct syscon_uc_info *priv;
21 if (device_get_uclass_id(dev) != UCLASS_SYSCON)
22 return ERR_PTR(-ENOEXEC);
23 priv = dev_get_uclass_priv(dev);
27 static int syscon_pre_probe(struct udevice *dev)
29 struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
32 * With OF_PLATDATA we really have no way of knowing the format of
33 * the device-specific platform data. So we assume that it starts with
34 * a 'reg' member, and this holds a single address and size. Drivers
35 * using OF_PLATDATA will need to ensure that this is true.
37 #if CONFIG_IS_ENABLED(OF_PLATDATA)
38 struct syscon_base_platdata *plat = dev_get_platdata(dev);
40 return regmap_init_mem_platdata(dev, plat->reg, ARRAY_SIZE(plat->reg),
43 return regmap_init_mem(dev, &priv->regmap);
47 int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp)
54 ret = uclass_get(UCLASS_SYSCON, &uc);
57 uclass_foreach_dev(dev, uc) {
58 if (dev->driver_data == driver_data) {
60 return device_probe(dev);
67 struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
69 struct syscon_uc_info *priv;
73 ret = syscon_get_by_driver_data(driver_data, &dev);
76 priv = dev_get_uclass_priv(dev);
81 void *syscon_get_first_range(ulong driver_data)
85 map = syscon_get_regmap_by_driver_data(driver_data);
88 return regmap_get_range(map, 0);
91 UCLASS_DRIVER(syscon) = {
94 .per_device_auto_alloc_size = sizeof(struct syscon_uc_info),
95 .pre_probe = syscon_pre_probe,
98 static const struct udevice_id generic_syscon_ids[] = {
99 { .compatible = "syscon" },
103 U_BOOT_DRIVER(generic_syscon) = {
106 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
107 .bind = dm_scan_fdt_dev,
109 .of_match = generic_syscon_ids,