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 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 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 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
);