2 * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
4 * SPDX-License-Identifier: GPL-2.0+
10 #include <linux/list.h>
11 #include <dm/device.h>
13 #include <dm/pinctrl.h>
14 #include <dm/uclass.h>
16 DECLARE_GLOBAL_DATA_PTR;
18 int pinctrl_decode_pin_config(const void *blob, int node)
22 if (fdtdec_get_bool(blob, node, "bias-pull-up"))
23 flags |= 1 << PIN_CONFIG_BIAS_PULL_UP;
24 else if (fdtdec_get_bool(blob, node, "bias-pull-down"))
25 flags |= 1 << PIN_CONFIG_BIAS_PULL_DOWN;
30 #if CONFIG_IS_ENABLED(PINCTRL_FULL)
32 * pinctrl_config_one() - apply pinctrl settings for a single node
34 * @config: pin configuration node
35 * @return: 0 on success, or negative error code on failure
37 static int pinctrl_config_one(struct udevice *config)
39 struct udevice *pctldev;
40 const struct pinctrl_ops *ops;
44 pctldev = dev_get_parent(pctldev);
46 dev_err(config, "could not find pctldev\n");
49 if (pctldev->uclass->uc_drv->id == UCLASS_PINCTRL)
53 ops = pinctrl_get_ops(pctldev);
54 return ops->set_state(pctldev, config);
58 * pinctrl_select_state_full() - full implementation of pinctrl_select_state
60 * @dev: peripheral device
61 * @statename: state name, like "default"
62 * @return: 0 on success, or negative error code on failure
64 static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
66 const void *fdt = gd->fdt_blob;
67 int node = dev->of_offset;
68 char propname[32]; /* long enough */
72 struct udevice *config;
73 int state, size, i, ret;
75 state = fdt_find_string(fdt, node, "pinctrl-names", statename);
79 * If statename is not found in "pinctrl-names",
80 * assume statename is just the integer state ID.
82 state = simple_strtoul(statename, &end, 10);
87 snprintf(propname, sizeof(propname), "pinctrl-%d", state);
88 list = fdt_getprop(fdt, node, propname, &size);
92 size /= sizeof(*list);
93 for (i = 0; i < size; i++) {
94 phandle = fdt32_to_cpu(*list++);
96 config_node = fdt_node_offset_by_phandle(fdt, phandle);
97 if (config_node < 0) {
98 dev_err(dev, "prop %s index %d invalid phandle\n",
102 ret = uclass_get_device_by_of_offset(UCLASS_PINCONFIG,
103 config_node, &config);
107 ret = pinctrl_config_one(config);
116 * pinconfig_post-bind() - post binding for PINCONFIG uclass
117 * Recursively bind its children as pinconfig devices.
119 * @dev: pinconfig device
120 * @return: 0 on success, or negative error code on failure
122 static int pinconfig_post_bind(struct udevice *dev)
124 const void *fdt = gd->fdt_blob;
125 int offset = dev->of_offset;
126 bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC);
130 for (offset = fdt_first_subnode(fdt, offset);
132 offset = fdt_next_subnode(fdt, offset)) {
133 if (pre_reloc_only &&
134 !fdt_getprop(fdt, offset, "u-boot,dm-pre-reloc", NULL))
137 * If this node has "compatible" property, this is not
138 * a pin configuration node, but a normal device. skip.
140 fdt_get_property(fdt, offset, "compatible", &ret);
144 if (ret != -FDT_ERR_NOTFOUND)
147 name = fdt_get_name(fdt, offset, NULL);
150 ret = device_bind_driver_to_node(dev, "pinconfig", name,
159 UCLASS_DRIVER(pinconfig) = {
160 .id = UCLASS_PINCONFIG,
161 .post_bind = pinconfig_post_bind,
165 U_BOOT_DRIVER(pinconfig_generic) = {
167 .id = UCLASS_PINCONFIG,
171 static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
176 static int pinconfig_post_bind(struct udevice *dev)
183 * pinctrl_select_state_simple() - simple implementation of pinctrl_select_state
185 * @dev: peripheral device
186 * @return: 0 on success, or negative error code on failure
188 static int pinctrl_select_state_simple(struct udevice *dev)
190 struct udevice *pctldev;
191 struct pinctrl_ops *ops;
195 * For simplicity, assume the first device of PINCTRL uclass
196 * is the correct one. This is most likely OK as there is
197 * usually only one pinctrl device on the system.
199 ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev);
203 ops = pinctrl_get_ops(pctldev);
204 if (!ops->set_state_simple) {
205 dev_dbg(dev, "set_state_simple op missing\n");
209 return ops->set_state_simple(pctldev, dev);
212 int pinctrl_select_state(struct udevice *dev, const char *statename)
215 * Try full-implemented pinctrl first.
216 * If it fails or is not implemented, try simple one.
218 if (pinctrl_select_state_full(dev, statename))
219 return pinctrl_select_state_simple(dev);
224 int pinctrl_request(struct udevice *dev, int func, int flags)
226 struct pinctrl_ops *ops = pinctrl_get_ops(dev);
231 return ops->request(dev, func, flags);
234 int pinctrl_request_noflags(struct udevice *dev, int func)
236 return pinctrl_request(dev, func, 0);
239 int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph)
241 struct pinctrl_ops *ops = pinctrl_get_ops(dev);
243 if (!ops->get_periph_id)
246 return ops->get_periph_id(dev, periph);
250 * pinconfig_post-bind() - post binding for PINCTRL uclass
251 * Recursively bind child nodes as pinconfig devices in case of full pinctrl.
253 * @dev: pinctrl device
254 * @return: 0 on success, or negative error code on failure
256 static int pinctrl_post_bind(struct udevice *dev)
258 const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
261 dev_dbg(dev, "ops is not set. Do not bind.\n");
266 * If set_state callback is set, we assume this pinctrl driver is the
267 * full implementation. In this case, its child nodes should be bound
268 * so that peripheral devices can easily search in parent devices
269 * during later DT-parsing.
272 return pinconfig_post_bind(dev);
277 UCLASS_DRIVER(pinctrl) = {
278 .id = UCLASS_PINCTRL,
279 .post_bind = pinctrl_post_bind,