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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Core driver for the generic pin config portions of the pin control subsystem
4 *
5 * Copyright (C) 2011 ST-Ericsson SA
6 * Written on behalf of Linaro for ST-Ericsson
7 *
8 * Author: Linus Walleij <linus.walleij@linaro.org>
9 */
10
11#define pr_fmt(fmt) "generic pinconfig core: " fmt
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/device.h>
17#include <linux/slab.h>
18#include <linux/debugfs.h>
19#include <linux/seq_file.h>
20#include <linux/pinctrl/pinctrl.h>
21#include <linux/pinctrl/pinconf.h>
22#include <linux/pinctrl/pinconf-generic.h>
23#include <linux/of.h>
24#include "core.h"
25#include "pinconf.h"
26#include "pinctrl-utils.h"
27
28#ifdef CONFIG_DEBUG_FS
29static const struct pin_config_item conf_items[] = {
30 PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
31 PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
32 PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
33 PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
34 PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
35 "input bias pull to pin specific state", NULL, false),
36 PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
37 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
38 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
39 PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
40 PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
41 PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH_UA, "output drive strength", "uA", true),
42 PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
43 PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
44 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
45 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
46 PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
47 PCONFDUMP(PIN_CONFIG_OUTPUT_ENABLE, "output enabled", NULL, false),
48 PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
49 PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
50 PCONFDUMP(PIN_CONFIG_SLEEP_HARDWARE_STATE, "sleep hardware state", NULL, false),
51 PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
52 PCONFDUMP(PIN_CONFIG_SKEW_DELAY, "skew delay", NULL, true),
53};
54
55static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
56 struct seq_file *s, const char *gname,
57 unsigned pin,
58 const struct pin_config_item *items,
59 int nitems, int *print_sep)
60{
61 int i;
62
63 for (i = 0; i < nitems; i++) {
64 unsigned long config;
65 int ret;
66
67 /* We want to check out this parameter */
68 config = pinconf_to_config_packed(items[i].param, 0);
69 if (gname)
70 ret = pin_config_group_get(dev_name(pctldev->dev),
71 gname, &config);
72 else
73 ret = pin_config_get_for_pin(pctldev, pin, &config);
74 /* These are legal errors */
75 if (ret == -EINVAL || ret == -ENOTSUPP)
76 continue;
77 if (ret) {
78 seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
79 continue;
80 }
81 /* comma between multiple configs */
82 if (*print_sep)
83 seq_puts(s, ", ");
84 *print_sep = 1;
85 seq_puts(s, items[i].display);
86 /* Print unit if available */
87 if (items[i].has_arg) {
88 seq_printf(s, " (%u",
89 pinconf_to_config_argument(config));
90 if (items[i].format)
91 seq_printf(s, " %s)", items[i].format);
92 else
93 seq_puts(s, ")");
94 }
95 }
96}
97
98/**
99 * pinconf_generic_dump_pins - Print information about pin or group of pins
100 * @pctldev: Pincontrol device
101 * @s: File to print to
102 * @gname: Group name specifying pins
103 * @pin: Pin number specyfying pin
104 *
105 * Print the pinconf configuration for the requested pin(s) to @s. Pins can be
106 * specified either by pin using @pin or by group using @gname. Only one needs
107 * to be specified the other can be NULL/0.
108 */
109void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,
110 const char *gname, unsigned pin)
111{
112 const struct pinconf_ops *ops = pctldev->desc->confops;
113 int print_sep = 0;
114
115 if (!ops->is_generic)
116 return;
117
118 /* generic parameters */
119 pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
120 ARRAY_SIZE(conf_items), &print_sep);
121 /* driver-specific parameters */
122 if (pctldev->desc->num_custom_params &&
123 pctldev->desc->custom_conf_items)
124 pinconf_generic_dump_one(pctldev, s, gname, pin,
125 pctldev->desc->custom_conf_items,
126 pctldev->desc->num_custom_params,
127 &print_sep);
128}
129
130void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
131 struct seq_file *s, unsigned long config)
132{
133 int i;
134
135 for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
136 if (pinconf_to_config_param(config) != conf_items[i].param)
137 continue;
138 seq_printf(s, "%s: 0x%x", conf_items[i].display,
139 pinconf_to_config_argument(config));
140 }
141
142 if (!pctldev->desc->num_custom_params ||
143 !pctldev->desc->custom_conf_items)
144 return;
145
146 for (i = 0; i < pctldev->desc->num_custom_params; i++) {
147 if (pinconf_to_config_param(config) !=
148 pctldev->desc->custom_conf_items[i].param)
149 continue;
150 seq_printf(s, "%s: 0x%x",
151 pctldev->desc->custom_conf_items[i].display,
152 pinconf_to_config_argument(config));
153 }
154}
155EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
156#endif
157
158#ifdef CONFIG_OF
159static const struct pinconf_generic_params dt_params[] = {
160 { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
161 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
162 { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
163 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
164 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
165 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
166 { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
167 { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
168 { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
169 { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
170 { "drive-strength-microamp", PIN_CONFIG_DRIVE_STRENGTH_UA, 0 },
171 { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
172 { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
173 { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
174 { "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
175 { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
176 { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
177 { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
178 { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
179 { "output-disable", PIN_CONFIG_OUTPUT_ENABLE, 0 },
180 { "output-enable", PIN_CONFIG_OUTPUT_ENABLE, 1 },
181 { "output-high", PIN_CONFIG_OUTPUT, 1, },
182 { "output-low", PIN_CONFIG_OUTPUT, 0, },
183 { "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
184 { "sleep-hardware-state", PIN_CONFIG_SLEEP_HARDWARE_STATE, 0 },
185 { "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
186 { "skew-delay", PIN_CONFIG_SKEW_DELAY, 0 },
187};
188
189/**
190 * parse_dt_cfg() - Parse DT pinconf parameters
191 * @np: DT node
192 * @params: Array of describing generic parameters
193 * @count: Number of entries in @params
194 * @cfg: Array of parsed config options
195 * @ncfg: Number of entries in @cfg
196 *
197 * Parse the config options described in @params from @np and puts the result
198 * in @cfg. @cfg does not need to be empty, entries are added beginning at
199 * @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
200 * needs to have enough memory allocated to hold all possible entries.
201 */
202static void parse_dt_cfg(struct device_node *np,
203 const struct pinconf_generic_params *params,
204 unsigned int count, unsigned long *cfg,
205 unsigned int *ncfg)
206{
207 int i;
208
209 for (i = 0; i < count; i++) {
210 u32 val;
211 int ret;
212 const struct pinconf_generic_params *par = ¶ms[i];
213
214 ret = of_property_read_u32(np, par->property, &val);
215
216 /* property not found */
217 if (ret == -EINVAL)
218 continue;
219
220 /* use default value, when no value is specified */
221 if (ret)
222 val = par->default_value;
223
224 pr_debug("found %s with value %u\n", par->property, val);
225 cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
226 (*ncfg)++;
227 }
228}
229
230/**
231 * pinconf_generic_parse_dt_config()
232 * parse the config properties into generic pinconfig values.
233 * @np: node containing the pinconfig properties
234 * @pctldev: pincontrol device
235 * @configs: array with nconfigs entries containing the generic pinconf values
236 * must be freed when no longer necessary.
237 * @nconfigs: number of configurations
238 */
239int pinconf_generic_parse_dt_config(struct device_node *np,
240 struct pinctrl_dev *pctldev,
241 unsigned long **configs,
242 unsigned int *nconfigs)
243{
244 unsigned long *cfg;
245 unsigned int max_cfg, ncfg = 0;
246 int ret;
247
248 if (!np)
249 return -EINVAL;
250
251 /* allocate a temporary array big enough to hold one of each option */
252 max_cfg = ARRAY_SIZE(dt_params);
253 if (pctldev)
254 max_cfg += pctldev->desc->num_custom_params;
255 cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
256 if (!cfg)
257 return -ENOMEM;
258
259 parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
260 if (pctldev && pctldev->desc->num_custom_params &&
261 pctldev->desc->custom_params)
262 parse_dt_cfg(np, pctldev->desc->custom_params,
263 pctldev->desc->num_custom_params, cfg, &ncfg);
264
265 ret = 0;
266
267 /* no configs found at all */
268 if (ncfg == 0) {
269 *configs = NULL;
270 *nconfigs = 0;
271 goto out;
272 }
273
274 /*
275 * Now limit the number of configs to the real number of
276 * found properties.
277 */
278 *configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
279 if (!*configs) {
280 ret = -ENOMEM;
281 goto out;
282 }
283
284 *nconfigs = ncfg;
285
286out:
287 kfree(cfg);
288 return ret;
289}
290EXPORT_SYMBOL_GPL(pinconf_generic_parse_dt_config);
291
292int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
293 struct device_node *np, struct pinctrl_map **map,
294 unsigned *reserved_maps, unsigned *num_maps,
295 enum pinctrl_map_type type)
296{
297 int ret;
298 const char *function;
299 struct device *dev = pctldev->dev;
300 unsigned long *configs = NULL;
301 unsigned num_configs = 0;
302 unsigned reserve, strings_count;
303 struct property *prop;
304 const char *group;
305 const char *subnode_target_type = "pins";
306
307 ret = of_property_count_strings(np, "pins");
308 if (ret < 0) {
309 ret = of_property_count_strings(np, "groups");
310 if (ret < 0)
311 /* skip this node; may contain config child nodes */
312 return 0;
313 if (type == PIN_MAP_TYPE_INVALID)
314 type = PIN_MAP_TYPE_CONFIGS_GROUP;
315 subnode_target_type = "groups";
316 } else {
317 if (type == PIN_MAP_TYPE_INVALID)
318 type = PIN_MAP_TYPE_CONFIGS_PIN;
319 }
320 strings_count = ret;
321
322 ret = of_property_read_string(np, "function", &function);
323 if (ret < 0) {
324 /* EINVAL=missing, which is fine since it's optional */
325 if (ret != -EINVAL)
326 dev_err(dev, "%pOF: could not parse property function\n",
327 np);
328 function = NULL;
329 }
330
331 ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
332 &num_configs);
333 if (ret < 0) {
334 dev_err(dev, "%pOF: could not parse node property\n", np);
335 return ret;
336 }
337
338 reserve = 0;
339 if (function != NULL)
340 reserve++;
341 if (num_configs)
342 reserve++;
343
344 reserve *= strings_count;
345
346 ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
347 num_maps, reserve);
348 if (ret < 0)
349 goto exit;
350
351 of_property_for_each_string(np, subnode_target_type, prop, group) {
352 if (function) {
353 ret = pinctrl_utils_add_map_mux(pctldev, map,
354 reserved_maps, num_maps, group,
355 function);
356 if (ret < 0)
357 goto exit;
358 }
359
360 if (num_configs) {
361 ret = pinctrl_utils_add_map_configs(pctldev, map,
362 reserved_maps, num_maps, group, configs,
363 num_configs, type);
364 if (ret < 0)
365 goto exit;
366 }
367 }
368 ret = 0;
369
370exit:
371 kfree(configs);
372 return ret;
373}
374EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
375
376int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
377 struct device_node *np_config, struct pinctrl_map **map,
378 unsigned *num_maps, enum pinctrl_map_type type)
379{
380 unsigned reserved_maps;
381 struct device_node *np;
382 int ret;
383
384 reserved_maps = 0;
385 *map = NULL;
386 *num_maps = 0;
387
388 ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
389 &reserved_maps, num_maps, type);
390 if (ret < 0)
391 goto exit;
392
393 for_each_available_child_of_node(np_config, np) {
394 ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
395 &reserved_maps, num_maps, type);
396 if (ret < 0)
397 goto exit;
398 }
399 return 0;
400
401exit:
402 pinctrl_utils_free_map(pctldev, *map, *num_maps);
403 return ret;
404}
405EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
406
407void pinconf_generic_dt_free_map(struct pinctrl_dev *pctldev,
408 struct pinctrl_map *map,
409 unsigned num_maps)
410{
411 pinctrl_utils_free_map(pctldev, map, num_maps);
412}
413EXPORT_SYMBOL_GPL(pinconf_generic_dt_free_map);
414
415#endif
1/*
2 * Core driver for the generic pin config portions of the pin control subsystem
3 *
4 * Copyright (C) 2011 ST-Ericsson SA
5 * Written on behalf of Linaro for ST-Ericsson
6 *
7 * Author: Linus Walleij <linus.walleij@linaro.org>
8 *
9 * License terms: GNU General Public License (GPL) version 2
10 */
11
12#define pr_fmt(fmt) "generic pinconfig core: " fmt
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/init.h>
17#include <linux/device.h>
18#include <linux/slab.h>
19#include <linux/debugfs.h>
20#include <linux/seq_file.h>
21#include <linux/pinctrl/pinctrl.h>
22#include <linux/pinctrl/pinconf.h>
23#include <linux/pinctrl/pinconf-generic.h>
24#include <linux/of.h>
25#include "core.h"
26#include "pinconf.h"
27#include "pinctrl-utils.h"
28
29#ifdef CONFIG_DEBUG_FS
30static const struct pin_config_item conf_items[] = {
31 PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
32 PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
33 PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
34 PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
35 PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
36 "input bias pull to pin specific state", NULL, false),
37 PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
38 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
39 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
40 PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
41 PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
42 PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
43 PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
44 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
45 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
46 PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
47 PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
48 PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
49 PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
50};
51
52static void pinconf_generic_dump_one(struct pinctrl_dev *pctldev,
53 struct seq_file *s, const char *gname,
54 unsigned pin,
55 const struct pin_config_item *items,
56 int nitems)
57{
58 int i;
59
60 for (i = 0; i < nitems; i++) {
61 unsigned long config;
62 int ret;
63
64 /* We want to check out this parameter */
65 config = pinconf_to_config_packed(items[i].param, 0);
66 if (gname)
67 ret = pin_config_group_get(dev_name(pctldev->dev),
68 gname, &config);
69 else
70 ret = pin_config_get_for_pin(pctldev, pin, &config);
71 /* These are legal errors */
72 if (ret == -EINVAL || ret == -ENOTSUPP)
73 continue;
74 if (ret) {
75 seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
76 continue;
77 }
78 /* Space between multiple configs */
79 seq_puts(s, " ");
80 seq_puts(s, items[i].display);
81 /* Print unit if available */
82 if (items[i].has_arg) {
83 seq_printf(s, " (%u",
84 pinconf_to_config_argument(config));
85 if (items[i].format)
86 seq_printf(s, " %s)", items[i].format);
87 else
88 seq_puts(s, ")");
89 }
90 }
91}
92
93/**
94 * pinconf_generic_dump_pins - Print information about pin or group of pins
95 * @pctldev: Pincontrol device
96 * @s: File to print to
97 * @gname: Group name specifying pins
98 * @pin: Pin number specyfying pin
99 *
100 * Print the pinconf configuration for the requested pin(s) to @s. Pins can be
101 * specified either by pin using @pin or by group using @gname. Only one needs
102 * to be specified the other can be NULL/0.
103 */
104void pinconf_generic_dump_pins(struct pinctrl_dev *pctldev, struct seq_file *s,
105 const char *gname, unsigned pin)
106{
107 const struct pinconf_ops *ops = pctldev->desc->confops;
108
109 if (!ops->is_generic)
110 return;
111
112 /* generic parameters */
113 pinconf_generic_dump_one(pctldev, s, gname, pin, conf_items,
114 ARRAY_SIZE(conf_items));
115 /* driver-specific parameters */
116 if (pctldev->desc->num_custom_params &&
117 pctldev->desc->custom_conf_items)
118 pinconf_generic_dump_one(pctldev, s, gname, pin,
119 pctldev->desc->custom_conf_items,
120 pctldev->desc->num_custom_params);
121}
122
123void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
124 struct seq_file *s, unsigned long config)
125{
126 int i;
127
128 for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
129 if (pinconf_to_config_param(config) != conf_items[i].param)
130 continue;
131 seq_printf(s, "%s: 0x%x", conf_items[i].display,
132 pinconf_to_config_argument(config));
133 }
134
135 if (!pctldev->desc->num_custom_params ||
136 !pctldev->desc->custom_conf_items)
137 return;
138
139 for (i = 0; i < pctldev->desc->num_custom_params; i++) {
140 if (pinconf_to_config_param(config) !=
141 pctldev->desc->custom_conf_items[i].param)
142 continue;
143 seq_printf(s, "%s: 0x%x",
144 pctldev->desc->custom_conf_items[i].display,
145 pinconf_to_config_argument(config));
146 }
147}
148EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
149#endif
150
151#ifdef CONFIG_OF
152static const struct pinconf_generic_params dt_params[] = {
153 { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
154 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
155 { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
156 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
157 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
158 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
159 { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
160 { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
161 { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
162 { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
163 { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
164 { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
165 { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
166 { "input-schmitt", PIN_CONFIG_INPUT_SCHMITT, 0 },
167 { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
168 { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
169 { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
170 { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
171 { "output-high", PIN_CONFIG_OUTPUT, 1, },
172 { "output-low", PIN_CONFIG_OUTPUT, 0, },
173 { "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
174 { "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
175};
176
177/**
178 * parse_dt_cfg() - Parse DT pinconf parameters
179 * @np: DT node
180 * @params: Array of describing generic parameters
181 * @count: Number of entries in @params
182 * @cfg: Array of parsed config options
183 * @ncfg: Number of entries in @cfg
184 *
185 * Parse the config options described in @params from @np and puts the result
186 * in @cfg. @cfg does not need to be empty, entries are added beggining at
187 * @ncfg. @ncfg is updated to reflect the number of entries after parsing. @cfg
188 * needs to have enough memory allocated to hold all possible entries.
189 */
190static void parse_dt_cfg(struct device_node *np,
191 const struct pinconf_generic_params *params,
192 unsigned int count, unsigned long *cfg,
193 unsigned int *ncfg)
194{
195 int i;
196
197 for (i = 0; i < count; i++) {
198 u32 val;
199 int ret;
200 const struct pinconf_generic_params *par = ¶ms[i];
201
202 ret = of_property_read_u32(np, par->property, &val);
203
204 /* property not found */
205 if (ret == -EINVAL)
206 continue;
207
208 /* use default value, when no value is specified */
209 if (ret)
210 val = par->default_value;
211
212 pr_debug("found %s with value %u\n", par->property, val);
213 cfg[*ncfg] = pinconf_to_config_packed(par->param, val);
214 (*ncfg)++;
215 }
216}
217
218/**
219 * pinconf_generic_parse_dt_config()
220 * parse the config properties into generic pinconfig values.
221 * @np: node containing the pinconfig properties
222 * @configs: array with nconfigs entries containing the generic pinconf values
223 * must be freed when no longer necessary.
224 * @nconfigs: umber of configurations
225 */
226int pinconf_generic_parse_dt_config(struct device_node *np,
227 struct pinctrl_dev *pctldev,
228 unsigned long **configs,
229 unsigned int *nconfigs)
230{
231 unsigned long *cfg;
232 unsigned int max_cfg, ncfg = 0;
233 int ret;
234
235 if (!np)
236 return -EINVAL;
237
238 /* allocate a temporary array big enough to hold one of each option */
239 max_cfg = ARRAY_SIZE(dt_params);
240 if (pctldev)
241 max_cfg += pctldev->desc->num_custom_params;
242 cfg = kcalloc(max_cfg, sizeof(*cfg), GFP_KERNEL);
243 if (!cfg)
244 return -ENOMEM;
245
246 parse_dt_cfg(np, dt_params, ARRAY_SIZE(dt_params), cfg, &ncfg);
247 if (pctldev && pctldev->desc->num_custom_params &&
248 pctldev->desc->custom_params)
249 parse_dt_cfg(np, pctldev->desc->custom_params,
250 pctldev->desc->num_custom_params, cfg, &ncfg);
251
252 ret = 0;
253
254 /* no configs found at all */
255 if (ncfg == 0) {
256 *configs = NULL;
257 *nconfigs = 0;
258 goto out;
259 }
260
261 /*
262 * Now limit the number of configs to the real number of
263 * found properties.
264 */
265 *configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
266 if (!*configs) {
267 ret = -ENOMEM;
268 goto out;
269 }
270
271 *nconfigs = ncfg;
272
273out:
274 kfree(cfg);
275 return ret;
276}
277
278int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
279 struct device_node *np, struct pinctrl_map **map,
280 unsigned *reserved_maps, unsigned *num_maps,
281 enum pinctrl_map_type type)
282{
283 int ret;
284 const char *function;
285 struct device *dev = pctldev->dev;
286 unsigned long *configs = NULL;
287 unsigned num_configs = 0;
288 unsigned reserve, strings_count;
289 struct property *prop;
290 const char *group;
291 const char *subnode_target_type = "pins";
292
293 ret = of_property_count_strings(np, "pins");
294 if (ret < 0) {
295 ret = of_property_count_strings(np, "groups");
296 if (ret < 0)
297 /* skip this node; may contain config child nodes */
298 return 0;
299 if (type == PIN_MAP_TYPE_INVALID)
300 type = PIN_MAP_TYPE_CONFIGS_GROUP;
301 subnode_target_type = "groups";
302 } else {
303 if (type == PIN_MAP_TYPE_INVALID)
304 type = PIN_MAP_TYPE_CONFIGS_PIN;
305 }
306 strings_count = ret;
307
308 ret = of_property_read_string(np, "function", &function);
309 if (ret < 0) {
310 /* EINVAL=missing, which is fine since it's optional */
311 if (ret != -EINVAL)
312 dev_err(dev, "%s: could not parse property function\n",
313 of_node_full_name(np));
314 function = NULL;
315 }
316
317 ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
318 &num_configs);
319 if (ret < 0) {
320 dev_err(dev, "%s: could not parse node property\n",
321 of_node_full_name(np));
322 return ret;
323 }
324
325 reserve = 0;
326 if (function != NULL)
327 reserve++;
328 if (num_configs)
329 reserve++;
330
331 reserve *= strings_count;
332
333 ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
334 num_maps, reserve);
335 if (ret < 0)
336 goto exit;
337
338 of_property_for_each_string(np, subnode_target_type, prop, group) {
339 if (function) {
340 ret = pinctrl_utils_add_map_mux(pctldev, map,
341 reserved_maps, num_maps, group,
342 function);
343 if (ret < 0)
344 goto exit;
345 }
346
347 if (num_configs) {
348 ret = pinctrl_utils_add_map_configs(pctldev, map,
349 reserved_maps, num_maps, group, configs,
350 num_configs, type);
351 if (ret < 0)
352 goto exit;
353 }
354 }
355 ret = 0;
356
357exit:
358 kfree(configs);
359 return ret;
360}
361EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
362
363int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
364 struct device_node *np_config, struct pinctrl_map **map,
365 unsigned *num_maps, enum pinctrl_map_type type)
366{
367 unsigned reserved_maps;
368 struct device_node *np;
369 int ret;
370
371 reserved_maps = 0;
372 *map = NULL;
373 *num_maps = 0;
374
375 ret = pinconf_generic_dt_subnode_to_map(pctldev, np_config, map,
376 &reserved_maps, num_maps, type);
377 if (ret < 0)
378 goto exit;
379
380 for_each_child_of_node(np_config, np) {
381 ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
382 &reserved_maps, num_maps, type);
383 if (ret < 0)
384 goto exit;
385 }
386 return 0;
387
388exit:
389 pinctrl_utils_dt_free_map(pctldev, *map, *num_maps);
390 return ret;
391}
392EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
393
394#endif