1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
7 #include <linux/libfdt.h>
9 #include <linux/list.h>
12 #include <dm/pinctrl.h>
14 #include <dm/of_access.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 char propname[32]; /* long enough */
69 struct udevice *config;
70 int state, size, i, ret;
72 state = dev_read_stringlist_search(dev, "pinctrl-names", statename);
76 * If statename is not found in "pinctrl-names",
77 * assume statename is just the integer state ID.
79 state = simple_strtoul(statename, &end, 10);
84 snprintf(propname, sizeof(propname), "pinctrl-%d", state);
85 list = dev_read_prop(dev, propname, &size);
89 size /= sizeof(*list);
90 for (i = 0; i < size; i++) {
91 phandle = fdt32_to_cpu(*list++);
92 ret = uclass_get_device_by_phandle_id(UCLASS_PINCONFIG, phandle,
97 ret = pinctrl_config_one(config);
106 * pinconfig_post_bind() - post binding for PINCONFIG uclass
107 * Recursively bind its children as pinconfig devices.
109 * @dev: pinconfig device
110 * @return: 0 on success, or negative error code on failure
112 static int pinconfig_post_bind(struct udevice *dev)
114 bool pre_reloc_only = !(gd->flags & GD_FLG_RELOC);
119 dev_for_each_subnode(node, dev) {
120 if (pre_reloc_only &&
121 !ofnode_pre_reloc(node))
124 * If this node has "compatible" property, this is not
125 * a pin configuration node, but a normal device. skip.
127 ofnode_get_property(node, "compatible", &ret);
130 /* If this node has "gpio-controller" property, skip */
131 if (ofnode_read_bool(node, "gpio-controller"))
134 if (ret != -FDT_ERR_NOTFOUND)
137 name = ofnode_get_name(node);
140 ret = device_bind_driver_to_node(dev, "pinconfig", name,
149 UCLASS_DRIVER(pinconfig) = {
150 .id = UCLASS_PINCONFIG,
151 .post_bind = pinconfig_post_bind,
155 U_BOOT_DRIVER(pinconfig_generic) = {
157 .id = UCLASS_PINCONFIG,
161 static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
166 static int pinconfig_post_bind(struct udevice *dev)
173 * pinctrl_select_state_simple() - simple implementation of pinctrl_select_state
175 * @dev: peripheral device
176 * @return: 0 on success, or negative error code on failure
178 static int pinctrl_select_state_simple(struct udevice *dev)
180 struct udevice *pctldev;
181 struct pinctrl_ops *ops;
185 * For most system, there is only one pincontroller device. But in
186 * case of multiple pincontroller devices, probe the one with sequence
187 * number 0 (defined by alias) to avoid race condition.
189 ret = uclass_get_device_by_seq(UCLASS_PINCTRL, 0, &pctldev);
191 /* if not found, get the first one */
192 ret = uclass_get_device(UCLASS_PINCTRL, 0, &pctldev);
196 ops = pinctrl_get_ops(pctldev);
197 if (!ops->set_state_simple) {
198 dev_dbg(dev, "set_state_simple op missing\n");
202 return ops->set_state_simple(pctldev, dev);
205 int pinctrl_select_state(struct udevice *dev, const char *statename)
208 * Some device which is logical like mmc.blk, do not have
211 if (!ofnode_valid(dev->node))
214 * Try full-implemented pinctrl first.
215 * If it fails or is not implemented, try simple one.
217 if (pinctrl_select_state_full(dev, statename))
218 return pinctrl_select_state_simple(dev);
223 int pinctrl_request(struct udevice *dev, int func, int flags)
225 struct pinctrl_ops *ops = pinctrl_get_ops(dev);
230 return ops->request(dev, func, flags);
233 int pinctrl_request_noflags(struct udevice *dev, int func)
235 return pinctrl_request(dev, func, 0);
238 int pinctrl_get_periph_id(struct udevice *dev, struct udevice *periph)
240 struct pinctrl_ops *ops = pinctrl_get_ops(dev);
242 if (!ops->get_periph_id)
245 return ops->get_periph_id(dev, periph);
248 int pinctrl_get_gpio_mux(struct udevice *dev, int banknum, int index)
250 struct pinctrl_ops *ops = pinctrl_get_ops(dev);
252 if (!ops->get_gpio_mux)
255 return ops->get_gpio_mux(dev, banknum, index);
258 int pinctrl_get_pins_count(struct udevice *dev)
260 struct pinctrl_ops *ops = pinctrl_get_ops(dev);
262 if (!ops->get_pins_count)
265 return ops->get_pins_count(dev);
268 int pinctrl_get_pin_name(struct udevice *dev, int selector, char *buf,
271 struct pinctrl_ops *ops = pinctrl_get_ops(dev);
273 if (!ops->get_pin_name)
276 snprintf(buf, size, ops->get_pin_name(dev, selector));
281 int pinctrl_get_pin_muxing(struct udevice *dev, int selector, char *buf,
284 struct pinctrl_ops *ops = pinctrl_get_ops(dev);
286 if (!ops->get_pin_muxing)
289 return ops->get_pin_muxing(dev, selector, buf, size);
293 * pinconfig_post_bind() - post binding for PINCTRL uclass
294 * Recursively bind child nodes as pinconfig devices in case of full pinctrl.
296 * @dev: pinctrl device
297 * @return: 0 on success, or negative error code on failure
299 static int pinctrl_post_bind(struct udevice *dev)
301 const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
304 dev_dbg(dev, "ops is not set. Do not bind.\n");
309 * If set_state callback is set, we assume this pinctrl driver is the
310 * full implementation. In this case, its child nodes should be bound
311 * so that peripheral devices can easily search in parent devices
312 * during later DT-parsing.
315 return pinconfig_post_bind(dev);
320 UCLASS_DRIVER(pinctrl) = {
321 .id = UCLASS_PINCTRL,
322 .post_bind = pinctrl_post_bind,
323 .flags = DM_UC_FLAG_SEQ_ALIAS,