1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2016, NVIDIA CORPORATION.
6 #define LOG_CATEGORY UCLASS_POWER_DOMAIN
12 #include <power-domain.h>
13 #include <power-domain-uclass.h>
14 #include <dm/device-internal.h>
16 static inline struct power_domain_ops *power_domain_dev_ops(struct udevice *dev)
18 return (struct power_domain_ops *)dev->driver->ops;
21 static int power_domain_of_xlate_default(struct power_domain *power_domain,
22 struct ofnode_phandle_args *args)
24 debug("%s(power_domain=%p)\n", __func__, power_domain);
26 if (args->args_count != 1) {
27 debug("Invalid args_count: %d\n", args->args_count);
31 power_domain->id = args->args[0];
36 int power_domain_get_by_index(struct udevice *dev,
37 struct power_domain *power_domain, int index)
39 struct ofnode_phandle_args args;
41 struct udevice *dev_power_domain;
42 struct power_domain_ops *ops;
44 debug("%s(dev=%p, power_domain=%p)\n", __func__, dev, power_domain);
46 ret = dev_read_phandle_with_args(dev, "power-domains",
47 "#power-domain-cells", 0, index,
50 debug("%s: dev_read_phandle_with_args failed: %d\n",
55 ret = uclass_get_device_by_ofnode(UCLASS_POWER_DOMAIN, args.node,
58 debug("%s: uclass_get_device_by_ofnode failed: %d\n",
62 ops = power_domain_dev_ops(dev_power_domain);
64 power_domain->dev = dev_power_domain;
66 ret = ops->of_xlate(power_domain, &args);
68 ret = power_domain_of_xlate_default(power_domain, &args);
70 debug("of_xlate() failed: %d\n", ret);
74 ret = ops->request(power_domain);
76 debug("ops->request() failed: %d\n", ret);
83 int power_domain_get(struct udevice *dev, struct power_domain *power_domain)
85 return power_domain_get_by_index(dev, power_domain, 0);
88 int power_domain_free(struct power_domain *power_domain)
90 struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev);
92 debug("%s(power_domain=%p)\n", __func__, power_domain);
94 return ops->rfree(power_domain);
97 int power_domain_on(struct power_domain *power_domain)
99 struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev);
101 debug("%s(power_domain=%p)\n", __func__, power_domain);
103 return ops->on(power_domain);
106 int power_domain_off(struct power_domain *power_domain)
108 struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev);
110 debug("%s(power_domain=%p)\n", __func__, power_domain);
112 return ops->off(power_domain);
115 #if CONFIG_IS_ENABLED(OF_REAL)
116 static int dev_power_domain_ctrl(struct udevice *dev, bool on)
118 struct power_domain pd;
119 int i, count, ret = 0;
121 count = dev_count_phandle_with_args(dev, "power-domains",
122 "#power-domain-cells", 0);
123 for (i = 0; i < count; i++) {
124 ret = power_domain_get_by_index(dev, &pd, i);
128 ret = power_domain_on(&pd);
130 ret = power_domain_off(&pd);
134 * For platforms with parent and child power-domain devices
135 * we may not run device_remove() on the power-domain parent
136 * because it will result in removing its children and switching
137 * off their power-domain parent. So we will get here again and
138 * again and will be stuck in an endless loop.
140 if (count > 0 && !on && dev_get_parent(dev) == pd.dev &&
141 device_get_uclass_id(dev) == UCLASS_POWER_DOMAIN)
145 * power_domain_get() bound the device, thus
146 * we must remove it again to prevent unbinding
147 * active devices (which would result in unbind
150 if (count > 0 && !on)
151 device_remove(pd.dev, DM_REMOVE_NORMAL);
156 int dev_power_domain_on(struct udevice *dev)
158 return dev_power_domain_ctrl(dev, true);
161 int dev_power_domain_off(struct udevice *dev)
163 return dev_power_domain_ctrl(dev, false);
167 UCLASS_DRIVER(power_domain) = {
168 .id = UCLASS_POWER_DOMAIN,
169 .name = "power_domain",