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![Soren Brinkmann](/assets/img/avatar_default.png)
With the new 'groups' property, the DT parser can infer the map type from the fact whether 'pins' or 'groups' is used to specify the pin group to work on. To maintain backwards compatibitliy with current usage of the DT binding, this is only done when PIN_MAP_TYPE_INVALID is passed to the parsing function as type. Also, a new helper 'pinconf_generic_dt_node_to_map_all()' is introduced, which can be used by drivers as generic callback for dt_node_to_map() to leverage the new feature. Changes since v2: - rename dt_pin_specifier to subnode_target_type - add additional comment in header file explaining passing an invalid map type - mention map_all() helper in commit message Changes since RFC v2: - none Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Tested-by: Andreas Färber <afaerber@suse.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
359 lines
9.9 KiB
C
359 lines
9.9 KiB
C
/*
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* Core driver for the generic pin config portions of the pin control subsystem
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*
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* Copyright (C) 2011 ST-Ericsson SA
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* Written on behalf of Linaro for ST-Ericsson
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#define pr_fmt(fmt) "generic pinconfig core: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/pinctrl/pinconf.h>
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#include <linux/pinctrl/pinconf-generic.h>
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#include <linux/of.h>
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#include "core.h"
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#include "pinconf.h"
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#include "pinctrl-utils.h"
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#ifdef CONFIG_DEBUG_FS
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struct pin_config_item {
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const enum pin_config_param param;
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const char * const display;
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const char * const format;
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bool has_arg;
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};
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#define PCONFDUMP(a, b, c, d) { .param = a, .display = b, .format = c, \
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.has_arg = d }
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static const struct pin_config_item conf_items[] = {
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PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL, false),
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PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL, false),
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PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL, false),
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL, false),
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL, false),
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PCONFDUMP(PIN_CONFIG_BIAS_PULL_PIN_DEFAULT,
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"input bias pull to pin specific state", NULL, false),
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PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL, false),
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PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_DRAIN, "output drive open drain", NULL, false),
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PCONFDUMP(PIN_CONFIG_DRIVE_OPEN_SOURCE, "output drive open source", NULL, false),
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PCONFDUMP(PIN_CONFIG_DRIVE_STRENGTH, "output drive strength", "mA", true),
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PCONFDUMP(PIN_CONFIG_INPUT_ENABLE, "input enabled", NULL, false),
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PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT_ENABLE, "input schmitt enabled", NULL, false),
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PCONFDUMP(PIN_CONFIG_INPUT_SCHMITT, "input schmitt trigger", NULL, false),
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PCONFDUMP(PIN_CONFIG_INPUT_DEBOUNCE, "input debounce", "usec", true),
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PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
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PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
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PCONFDUMP(PIN_CONFIG_LOW_POWER_MODE, "pin low power", "mode", true),
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PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
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};
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void pinconf_generic_dump_pin(struct pinctrl_dev *pctldev,
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struct seq_file *s, unsigned pin)
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{
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const struct pinconf_ops *ops = pctldev->desc->confops;
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int i;
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if (!ops->is_generic)
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return;
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for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
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unsigned long config;
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int ret;
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/* We want to check out this parameter */
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config = pinconf_to_config_packed(conf_items[i].param, 0);
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ret = pin_config_get_for_pin(pctldev, pin, &config);
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/* These are legal errors */
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if (ret == -EINVAL || ret == -ENOTSUPP)
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continue;
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if (ret) {
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seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
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continue;
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}
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/* Space between multiple configs */
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seq_puts(s, " ");
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seq_puts(s, conf_items[i].display);
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/* Print unit if available */
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if (conf_items[i].has_arg) {
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seq_printf(s, " (%u",
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pinconf_to_config_argument(config));
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if (conf_items[i].format)
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seq_printf(s, " %s)", conf_items[i].format);
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else
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seq_puts(s, ")");
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}
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}
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}
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void pinconf_generic_dump_group(struct pinctrl_dev *pctldev,
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struct seq_file *s, const char *gname)
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{
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const struct pinconf_ops *ops = pctldev->desc->confops;
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int i;
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if (!ops->is_generic)
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return;
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for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
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unsigned long config;
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int ret;
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/* We want to check out this parameter */
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config = pinconf_to_config_packed(conf_items[i].param, 0);
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ret = pin_config_group_get(dev_name(pctldev->dev), gname,
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&config);
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/* These are legal errors */
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if (ret == -EINVAL || ret == -ENOTSUPP)
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continue;
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if (ret) {
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seq_printf(s, "ERROR READING CONFIG SETTING %d ", i);
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continue;
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}
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/* Space between multiple configs */
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seq_puts(s, " ");
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seq_puts(s, conf_items[i].display);
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/* Print unit if available */
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if (conf_items[i].has_arg) {
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seq_printf(s, " (%u",
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pinconf_to_config_argument(config));
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if (conf_items[i].format)
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seq_printf(s, " %s)", conf_items[i].format);
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else
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seq_puts(s, ")");
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}
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}
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}
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void pinconf_generic_dump_config(struct pinctrl_dev *pctldev,
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struct seq_file *s, unsigned long config)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(conf_items); i++) {
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if (pinconf_to_config_param(config) != conf_items[i].param)
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continue;
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seq_printf(s, "%s: 0x%x", conf_items[i].display,
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pinconf_to_config_argument(config));
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}
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}
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EXPORT_SYMBOL_GPL(pinconf_generic_dump_config);
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#endif
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#ifdef CONFIG_OF
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struct pinconf_generic_dt_params {
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const char * const property;
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enum pin_config_param param;
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u32 default_value;
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};
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static const struct pinconf_generic_dt_params dt_params[] = {
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{ "bias-disable", PIN_CONFIG_BIAS_DISABLE, 0 },
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{ "bias-high-impedance", PIN_CONFIG_BIAS_HIGH_IMPEDANCE, 0 },
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{ "bias-bus-hold", PIN_CONFIG_BIAS_BUS_HOLD, 0 },
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{ "bias-pull-up", PIN_CONFIG_BIAS_PULL_UP, 1 },
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{ "bias-pull-down", PIN_CONFIG_BIAS_PULL_DOWN, 1 },
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{ "bias-pull-pin-default", PIN_CONFIG_BIAS_PULL_PIN_DEFAULT, 1 },
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{ "drive-push-pull", PIN_CONFIG_DRIVE_PUSH_PULL, 0 },
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{ "drive-open-drain", PIN_CONFIG_DRIVE_OPEN_DRAIN, 0 },
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{ "drive-open-source", PIN_CONFIG_DRIVE_OPEN_SOURCE, 0 },
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{ "drive-strength", PIN_CONFIG_DRIVE_STRENGTH, 0 },
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{ "input-enable", PIN_CONFIG_INPUT_ENABLE, 1 },
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{ "input-disable", PIN_CONFIG_INPUT_ENABLE, 0 },
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{ "input-schmitt-enable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 1 },
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{ "input-schmitt-disable", PIN_CONFIG_INPUT_SCHMITT_ENABLE, 0 },
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{ "input-debounce", PIN_CONFIG_INPUT_DEBOUNCE, 0 },
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{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
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{ "low-power-enable", PIN_CONFIG_LOW_POWER_MODE, 1 },
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{ "low-power-disable", PIN_CONFIG_LOW_POWER_MODE, 0 },
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{ "output-low", PIN_CONFIG_OUTPUT, 0, },
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{ "output-high", PIN_CONFIG_OUTPUT, 1, },
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{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0},
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};
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/**
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* pinconf_generic_parse_dt_config()
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* parse the config properties into generic pinconfig values.
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* @np: node containing the pinconfig properties
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* @configs: array with nconfigs entries containing the generic pinconf values
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* @nconfigs: umber of configurations
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*/
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int pinconf_generic_parse_dt_config(struct device_node *np,
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unsigned long **configs,
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unsigned int *nconfigs)
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{
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unsigned long *cfg;
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unsigned int ncfg = 0;
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int ret;
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int i;
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u32 val;
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if (!np)
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return -EINVAL;
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/* allocate a temporary array big enough to hold one of each option */
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cfg = kzalloc(sizeof(*cfg) * ARRAY_SIZE(dt_params), GFP_KERNEL);
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if (!cfg)
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return -ENOMEM;
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for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
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const struct pinconf_generic_dt_params *par = &dt_params[i];
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ret = of_property_read_u32(np, par->property, &val);
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/* property not found */
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if (ret == -EINVAL)
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continue;
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/* use default value, when no value is specified */
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if (ret)
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val = par->default_value;
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pr_debug("found %s with value %u\n", par->property, val);
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cfg[ncfg] = pinconf_to_config_packed(par->param, val);
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ncfg++;
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}
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ret = 0;
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/* no configs found at all */
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if (ncfg == 0) {
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*configs = NULL;
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*nconfigs = 0;
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goto out;
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}
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/*
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* Now limit the number of configs to the real number of
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* found properties.
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*/
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*configs = kmemdup(cfg, ncfg * sizeof(unsigned long), GFP_KERNEL);
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if (!*configs) {
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ret = -ENOMEM;
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goto out;
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}
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*nconfigs = ncfg;
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out:
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kfree(cfg);
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return ret;
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}
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int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
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struct device_node *np, struct pinctrl_map **map,
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unsigned *reserved_maps, unsigned *num_maps,
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enum pinctrl_map_type type)
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{
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int ret;
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const char *function;
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struct device *dev = pctldev->dev;
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unsigned long *configs = NULL;
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unsigned num_configs = 0;
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unsigned reserve;
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struct property *prop;
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const char *group;
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const char *subnode_target_type = "pins";
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ret = of_property_read_string(np, "function", &function);
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if (ret < 0) {
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/* EINVAL=missing, which is fine since it's optional */
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if (ret != -EINVAL)
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dev_err(dev, "could not parse property function\n");
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function = NULL;
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}
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ret = pinconf_generic_parse_dt_config(np, &configs, &num_configs);
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if (ret < 0) {
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dev_err(dev, "could not parse node property\n");
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return ret;
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}
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reserve = 0;
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if (function != NULL)
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reserve++;
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if (num_configs)
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reserve++;
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ret = of_property_count_strings(np, "pins");
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if (ret < 0) {
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ret = of_property_count_strings(np, "groups");
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if (ret < 0) {
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dev_err(dev, "could not parse property pins/groups\n");
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goto exit;
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}
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if (type == PIN_MAP_TYPE_INVALID)
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type = PIN_MAP_TYPE_CONFIGS_GROUP;
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subnode_target_type = "groups";
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} else {
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if (type == PIN_MAP_TYPE_INVALID)
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type = PIN_MAP_TYPE_CONFIGS_PIN;
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}
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reserve *= ret;
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ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps,
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num_maps, reserve);
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if (ret < 0)
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goto exit;
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of_property_for_each_string(np, subnode_target_type, prop, group) {
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if (function) {
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ret = pinctrl_utils_add_map_mux(pctldev, map,
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reserved_maps, num_maps, group,
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function);
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if (ret < 0)
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goto exit;
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}
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if (num_configs) {
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ret = pinctrl_utils_add_map_configs(pctldev, map,
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reserved_maps, num_maps, group, configs,
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num_configs, type);
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if (ret < 0)
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goto exit;
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}
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}
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ret = 0;
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exit:
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kfree(configs);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pinconf_generic_dt_subnode_to_map);
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int pinconf_generic_dt_node_to_map(struct pinctrl_dev *pctldev,
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struct device_node *np_config, struct pinctrl_map **map,
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unsigned *num_maps, enum pinctrl_map_type type)
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{
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unsigned reserved_maps;
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struct device_node *np;
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int ret;
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reserved_maps = 0;
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*map = NULL;
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*num_maps = 0;
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for_each_child_of_node(np_config, np) {
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ret = pinconf_generic_dt_subnode_to_map(pctldev, np, map,
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&reserved_maps, num_maps, type);
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if (ret < 0) {
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pinctrl_utils_dt_free_map(pctldev, *map, *num_maps);
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return ret;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(pinconf_generic_dt_node_to_map);
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#endif
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