2 * Core driver for the generic pin config portions of the pin control subsystem
4 * Copyright (C) 2011 ST-Ericsson SA
5 * Written on behalf of Linaro for ST-Ericsson
7 * Author: Linus Walleij <linus.walleij@linaro.org>
9 * License terms: GNU General Public License (GPL) version 2
12 #define pr_fmt(fmt) "generic pinconfig core: " fmt
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>
27 #include "pinctrl-utils.h"
29 #ifdef CONFIG_DEBUG_FS
31 struct pin_config_item {
32 const enum pin_config_param param;
33 const char * const display;
34 const char * const format;
38 #define PCONFDUMP(a, b, c, d) { .param = a, .display = b, .format = c, \
41 static const struct pin_config_item conf_items[] = {
42 PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
43 PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
44 PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
45 PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
46 PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
47 PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
48 "input bias pull to pin specific state", NULL, false),
49 PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
50 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
51 PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
52 PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
53 PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
54 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
55 PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
56 PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
57 PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
58 PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
59 PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
60 PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
63 void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
64 struct seq_file *s, unsigned pin)
66 const struct pinconf_ops *ops = pctldev->desc->confops;
72 for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
76 /* We want to check out this parameter */
77 config = pinconf_to_config_packed(conf_items[i].param, 0);
78 ret = pin_config_get_for_pin(pctldev, pin, &config);
79 /* These are legal errors */
80 if (ret == -EINVAL || ret == -ENOTSUPP)
83 seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
86 /* Space between multiple configs */
88 seq_puts(s, conf_items[i].display);
89 /* Print unit if available */
90 if (conf_items[i].has_arg) {
92 pinconf_to_config_argument(config));
93 if (conf_items[i].format)
94 seq_printf(s, " %s)", conf_items[i].format);
101 void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
102 struct seq_file *s, const char *gname)
104 const struct pinconf_ops *ops = pctldev->desc->confops;
107 if (!ops->is_generic)
110 for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
111 unsigned long config;
114 /* We want to check out this parameter */
115 config = pinconf_to_config_packed(conf_items[i].param, 0);
116 ret = pin_config_group_get(dev_name(pctldev->dev), gname,
118 /* These are legal errors */
119 if (ret == -EINVAL || ret == -ENOTSUPP)
122 seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
125 /* Space between multiple configs */
127 seq_puts(s, conf_items[i].display);
128 /* Print unit if available */
129 if (conf_items[i].has_arg) {
130 seq_printf(s, " (%u",
131 pinconf_to_config_argument(config));
132 if (conf_items[i].format)
133 seq_printf(s, " %s)", conf_items[i].format);
140 void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
141 struct seq_file *s, unsigned long config)
145 for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
146 if (pinconf_to_config_param(config) != conf_items[i].param)
148 seq_printf(s, "%s: 0x%x", conf_items[i].display,
149 pinconf_to_config_argument(config));
152 EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
156 struct pinconf_generic_dt_params {
157 const char * const property;
158 enum pin_config_param param;
162 static const struct pinconf_generic_dt_params dt_params[] = {
163 { "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
164 { "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
165 { "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
166 { "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
167 { "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
168 { "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
169 { "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
170 { "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
171 { "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
172 { "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
173 { "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
174 { "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
175 { "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
176 { "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
177 { "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
178 { "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
179 { "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
180 { "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
181 { "output-low", PIN_CONFIG_OUTPUT, 0, },
182 { "output-high", PIN_CONFIG_OUTPUT, 1, },
183 { "slew-rate", PIN_CONFIG_SLEW_RATE, 0},
187 * pinconf_generic_parse_dt_config()
188 * parse the config properties into generic pinconfig values.
189 * @np: node containing the pinconfig properties
190 * @configs: array with nconfigs entries containing the generic pinconf values
191 * @nconfigs: umber of configurations
193 int pinconf_generic_parse_dt_config(struct device_node *np,
194 unsigned long **configs,
195 unsigned int *nconfigs)
198 unsigned int ncfg = 0;
206 /* allocate a temporary array big enough to hold one of each option */
207 cfg = kzalloc(sizeof(*cfg) * ARRAY_SIZE(dt_params), GFP_KERNEL);
211 for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
212 const struct pinconf_generic_dt_params *par = &dt_params[i];
213 ret = of_property_read_u32(np, par->property, &val);
215 /* property not found */
219 /* use default value, when no value is specified */
221 val = par->default_value;
223 pr_debug("found %s with value %u\n", par->property, val);
224 cfg[ncfg] = pinconf_to_config_packed(par->param, val);
230 /* no configs found at all */
238 * Now limit the number of configs to the real number of
241 *configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
254 int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
255 struct device_node *np, struct pinctrl_map **map,
256 unsigned *reserved_maps, unsigned *num_maps,
257 enum pinctrl_map_type type)
260 const char *function;
261 struct device *dev = pctldev->dev;
262 unsigned long *configs = NULL;
263 unsigned num_configs = 0;
265 struct property *prop;
268 ret = of_property_read_string(np, "function", &function);
270 /* EINVAL=missing, which is fine since it's optional */
272 dev_err(dev, "could not parse property function\n");
276 ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
278 dev_err(dev, "could not parse node property\n");
283 if (function != NULL)
287 ret = of_property_count_strings(np, "pins");
289 dev_err(dev, "could not parse property pins\n");
294 ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
299 of_property_for_each_string(np, "pins", prop, group) {
301 ret = pinctrl_utils_add_map_mux(pctldev, map,
302 reserved_maps, num_maps, group,
309 ret = pinctrl_utils_add_map_configs(pctldev, map,
310 reserved_maps, num_maps, group, configs,
322 EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
324 int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
325 struct device_node *np_config, struct pinctrl_map **map,
326 unsigned *num_maps, enum pinctrl_map_type type)
328 unsigned reserved_maps;
329 struct device_node *np;
336 for_each_child_of_node(np_config, np) {
337 ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
338 &reserved_maps, num_maps, type);
340 pinctrl_utils_dt_free_map(pctldev, *map, *num_maps);
346 EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);