2 * Copyright (C) 2015 Masahiro Yamada <yamada.masahiro@socionext.com>
4 * SPDX-License-Identifier: GPL-2.0+
8 #include <linux/compat.h>
10 #include <dm/pinctrl.h>
12 DECLARE_GLOBAL_DATA_PTR;
15 * pinctrl_pin_name_to_selector() - return the pin selector for a pin
17 * @dev: pin controller device
18 * @pin: the pin name to look up
19 * @return: pin selector, or negative error code on failure
21 static int pinctrl_pin_name_to_selector(struct udevice *dev, const char *pin)
23 const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
24 unsigned npins, selector;
26 if (!ops->get_pins_count || !ops->get_pin_name) {
27 dev_dbg(dev, "get_pins_count or get_pin_name missing\n");
31 npins = ops->get_pins_count(dev);
33 /* See if this pctldev has this pin */
34 for (selector = 0; selector < npins; selector++) {
35 const char *pname = ops->get_pin_name(dev, selector);
37 if (!strcmp(pin, pname))
45 * pinctrl_group_name_to_selector() - return the group selector for a group
47 * @dev: pin controller device
48 * @group: the pin group name to look up
49 * @return: pin group selector, or negative error code on failure
51 static int pinctrl_group_name_to_selector(struct udevice *dev,
54 const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
55 unsigned ngroups, selector;
57 if (!ops->get_groups_count || !ops->get_group_name) {
58 dev_dbg(dev, "get_groups_count or get_group_name missing\n");
62 ngroups = ops->get_groups_count(dev);
64 /* See if this pctldev has this group */
65 for (selector = 0; selector < ngroups; selector++) {
66 const char *gname = ops->get_group_name(dev, selector);
68 if (!strcmp(group, gname))
75 #if CONFIG_IS_ENABLED(PINMUX)
77 * pinmux_func_name_to_selector() - return the function selector for a function
79 * @dev: pin controller device
80 * @function: the function name to look up
81 * @return: function selector, or negative error code on failure
83 static int pinmux_func_name_to_selector(struct udevice *dev,
86 const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
87 unsigned nfuncs, selector = 0;
89 if (!ops->get_functions_count || !ops->get_function_name) {
91 "get_functions_count or get_function_name missing\n");
95 nfuncs = ops->get_functions_count(dev);
97 /* See if this pctldev has this function */
98 for (selector = 0; selector < nfuncs; selector++) {
99 const char *fname = ops->get_function_name(dev, selector);
101 if (!strcmp(function, fname))
109 * pinmux_enable_setting() - enable pin-mux setting for a certain pin/group
111 * @dev: pin controller device
112 * @is_group: target of operation (true: pin group, false: pin)
113 * @selector: pin selector or group selector, depending on @is_group
114 * @func_selector: function selector
115 * @return: 0 on success, or negative error code on failure
117 static int pinmux_enable_setting(struct udevice *dev, bool is_group,
118 unsigned selector, unsigned func_selector)
120 const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
123 if (!ops->pinmux_group_set) {
124 dev_dbg(dev, "pinmux_group_set op missing\n");
128 return ops->pinmux_group_set(dev, selector, func_selector);
130 if (!ops->pinmux_set) {
131 dev_dbg(dev, "pinmux_set op missing\n");
134 return ops->pinmux_set(dev, selector, func_selector);
138 static int pinmux_func_name_to_selector(struct udevice *dev,
139 const char *function)
144 static int pinmux_enable_setting(struct udevice *dev, bool is_group,
145 unsigned selector, unsigned func_selector)
151 #if CONFIG_IS_ENABLED(PINCONF)
153 * pinconf_prop_name_to_param() - return parameter ID for a property name
155 * @dev: pin controller device
156 * @property: property name in DTS, such as "bias-pull-up", "slew-rate", etc.
157 * @default_value: return default value in case no value is specified in DTS
158 * @return: return pamater ID, or negative error code on failure
160 static int pinconf_prop_name_to_param(struct udevice *dev,
161 const char *property, u32 *default_value)
163 const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
164 const struct pinconf_param *p, *end;
166 if (!ops->pinconf_num_params || !ops->pinconf_params) {
167 dev_dbg(dev, "pinconf_num_params or pinconf_params missing\n");
171 p = ops->pinconf_params;
172 end = p + ops->pinconf_num_params;
174 /* See if this pctldev supports this parameter */
175 for (; p < end; p++) {
176 if (!strcmp(property, p->property)) {
177 *default_value = p->default_value;
186 * pinconf_enable_setting() - apply pin configuration for a certain pin/group
188 * @dev: pin controller device
189 * @is_group: target of operation (true: pin group, false: pin)
190 * @selector: pin selector or group selector, depending on @is_group
191 * @param: configuration paramter
192 * @argument: argument taken by some configuration parameters
193 * @return: 0 on success, or negative error code on failure
195 static int pinconf_enable_setting(struct udevice *dev, bool is_group,
196 unsigned selector, unsigned param,
199 const struct pinctrl_ops *ops = pinctrl_get_ops(dev);
202 if (!ops->pinconf_group_set) {
203 dev_dbg(dev, "pinconf_group_set op missing\n");
207 return ops->pinconf_group_set(dev, selector, param,
210 if (!ops->pinconf_set) {
211 dev_dbg(dev, "pinconf_set op missing\n");
214 return ops->pinconf_set(dev, selector, param, argument);
218 static int pinconf_prop_name_to_param(struct udevice *dev,
219 const char *property, u32 *default_value)
224 static int pinconf_enable_setting(struct udevice *dev, bool is_group,
225 unsigned selector, unsigned param,
233 * pinctrl_generic_set_state_one() - set state for a certain pin/group
234 * Apply all pin multiplexing and pin configurations specified by @config
235 * for a given pin or pin group.
237 * @dev: pin controller device
238 * @config: pseudo device pointing to config node
239 * @is_group: target of operation (true: pin group, false: pin)
240 * @selector: pin selector or group selector, depending on @is_group
241 * @return: 0 on success, or negative error code on failure
243 static int pinctrl_generic_set_state_one(struct udevice *dev,
244 struct udevice *config,
245 bool is_group, unsigned selector)
247 const void *fdt = gd->fdt_blob;
248 int node_offset = config->of_offset;
249 const char *propname;
251 int prop_offset, len, func_selector, param, ret;
252 u32 arg, default_val;
254 for (prop_offset = fdt_first_property_offset(fdt, node_offset);
256 prop_offset = fdt_next_property_offset(fdt, prop_offset)) {
257 value = fdt_getprop_by_offset(fdt, prop_offset,
262 if (!strcmp(propname, "function")) {
263 func_selector = pinmux_func_name_to_selector(dev,
265 if (func_selector < 0)
266 return func_selector;
267 ret = pinmux_enable_setting(dev, is_group,
271 param = pinconf_prop_name_to_param(dev, propname,
274 continue; /* just skip unknown properties */
276 if (len >= sizeof(fdt32_t))
277 arg = fdt32_to_cpu(*(fdt32_t *)value);
281 ret = pinconf_enable_setting(dev, is_group,
282 selector, param, arg);
293 * pinctrl_generic_set_state_subnode() - apply all settings in config node
295 * @dev: pin controller device
296 * @config: pseudo device pointing to config node
297 * @return: 0 on success, or negative error code on failure
299 static int pinctrl_generic_set_state_subnode(struct udevice *dev,
300 struct udevice *config)
302 const void *fdt = gd->fdt_blob;
303 int node = config->of_offset;
304 const char *subnode_target_type = "pins";
305 bool is_group = false;
307 int strings_count, selector, i, ret;
309 strings_count = fdt_stringlist_count(fdt, node, subnode_target_type);
310 if (strings_count < 0) {
311 subnode_target_type = "groups";
313 strings_count = fdt_stringlist_count(fdt, node,
314 subnode_target_type);
315 if (strings_count < 0) {
316 /* skip this node; may contain config child nodes */
321 for (i = 0; i < strings_count; i++) {
322 name = fdt_stringlist_get(fdt, node, subnode_target_type, i,
328 selector = pinctrl_group_name_to_selector(dev, name);
330 selector = pinctrl_pin_name_to_selector(dev, name);
334 ret = pinctrl_generic_set_state_one(dev, config,
343 int pinctrl_generic_set_state(struct udevice *dev, struct udevice *config)
345 struct udevice *child;
348 ret = pinctrl_generic_set_state_subnode(dev, config);
352 for (device_find_first_child(config, &child);
354 device_find_next_child(&child)) {
355 ret = pinctrl_generic_set_state_subnode(dev, child);