1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
13 #include <dm/device-internal.h>
14 #include <dm/device_compat.h>
17 #include <linux/err.h>
21 * This API requires the given device has alerady been bound to syscon driver.
23 * compatible = "syscon", "simple-mfd";
25 * compatible = "simple-mfd", "syscon";
26 * does not. The behavior is different from Linux.
28 struct regmap *syscon_get_regmap(struct udevice *dev)
30 struct syscon_uc_info *priv;
32 if (device_get_uclass_id(dev) != UCLASS_SYSCON)
33 return ERR_PTR(-ENOEXEC);
34 priv = dev_get_uclass_priv(dev);
38 static int syscon_pre_probe(struct udevice *dev)
40 struct syscon_uc_info *priv = dev_get_uclass_priv(dev);
42 /* Special case for PCI devices, which don't have a regmap */
43 if (device_get_uclass_id(dev->parent) == UCLASS_PCI)
47 * With OF_PLATDATA we really have no way of knowing the format of
48 * the device-specific platform data. So we assume that it starts with
49 * a 'reg' member, and this holds a single address and size. Drivers
50 * using OF_PLATDATA will need to ensure that this is true.
52 #if CONFIG_IS_ENABLED(OF_PLATDATA)
53 struct syscon_base_platdata *plat = dev_get_platdata(dev);
55 return regmap_init_mem_platdata(dev, plat->reg, ARRAY_SIZE(plat->reg),
58 return regmap_init_mem(dev_ofnode(dev), &priv->regmap);
62 static int syscon_probe_by_ofnode(ofnode node, struct udevice **devp)
64 struct udevice *dev, *parent;
67 /* found node with "syscon" compatible, not bounded to SYSCON UCLASS */
68 if (!ofnode_device_is_compatible(node, "syscon")) {
69 dev_dbg(dev, "invalid compatible for syscon device\n");
73 /* bound to driver with same ofnode or to root if not found */
74 if (device_find_global_by_ofnode(node, &parent))
77 /* force bound to syscon class */
78 ret = device_bind_driver_to_node(parent, "syscon",
79 ofnode_get_name(node),
82 dev_dbg(dev, "unable to bound syscon device\n");
85 ret = device_probe(dev);
87 dev_dbg(dev, "unable to probe syscon device\n");
95 struct regmap *syscon_regmap_lookup_by_phandle(struct udevice *dev,
98 struct udevice *syscon;
104 err = uclass_get_device_by_phandle(UCLASS_SYSCON, dev,
107 /* found node with "syscon" compatible, not bounded to SYSCON */
108 err = ofnode_read_u32(dev_ofnode(dev), name, &phandle);
112 node = ofnode_get_by_phandle(phandle);
113 if (!ofnode_valid(node)) {
114 dev_dbg(dev, "unable to find syscon device\n");
115 return ERR_PTR(-EINVAL);
117 err = syscon_probe_by_ofnode(node, &syscon);
119 return ERR_PTR(-ENODEV);
122 r = syscon_get_regmap(syscon);
124 dev_dbg(dev, "unable to find regmap\n");
125 return ERR_PTR(-ENODEV);
131 int syscon_get_by_driver_data(ulong driver_data, struct udevice **devp)
137 ret = uclass_first_device_drvdata(UCLASS_SYSCON, driver_data, devp);
139 return log_msg_ret("find", ret);
144 struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
146 struct syscon_uc_info *priv;
150 ret = syscon_get_by_driver_data(driver_data, &dev);
153 priv = dev_get_uclass_priv(dev);
158 void *syscon_get_first_range(ulong driver_data)
162 map = syscon_get_regmap_by_driver_data(driver_data);
165 return regmap_get_range(map, 0);
168 UCLASS_DRIVER(syscon) = {
171 .per_device_auto_alloc_size = sizeof(struct syscon_uc_info),
172 .pre_probe = syscon_pre_probe,
175 static const struct udevice_id generic_syscon_ids[] = {
176 { .compatible = "syscon" },
180 U_BOOT_DRIVER(generic_syscon) = {
183 #if !CONFIG_IS_ENABLED(OF_PLATDATA)
184 .bind = dm_scan_fdt_dev,
186 .of_match = generic_syscon_ids,
190 * Linux-compatible syscon-to-regmap
191 * The syscon node can be bound to another driver, but still works
192 * as a syscon provider.
194 struct regmap *syscon_node_to_regmap(ofnode node)
199 if (uclass_get_device_by_ofnode(UCLASS_SYSCON, node, &dev))
200 if (syscon_probe_by_ofnode(node, &dev))
201 return ERR_PTR(-ENODEV);
203 r = syscon_get_regmap(dev);
205 dev_dbg(dev, "unable to find regmap\n");
206 return ERR_PTR(-ENODEV);