blob: 5fb74b43848e21369670b4503fdee13b0d4f255e [file] [log] [blame]
* Driver core interface to the pinctrl subsystem.
* Copyright (C) 2012 ST-Ericsson SA
* Written on behalf of Linaro for ST-Ericsson
* Based on bits of regulator core, gpio core and clk core
* Author: Linus Walleij <>
* License terms: GNU General Public License (GPL) version 2
#include <linux/device.h>
#include <linux/pinctrl/devinfo.h>
#include <linux/pinctrl/consumer.h>
#include <linux/slab.h>
* pinctrl_bind_pins() - called by the device core before probe
* @dev: the device that is just about to probe
int pinctrl_bind_pins(struct device *dev)
int ret;
dev->pins = devm_kzalloc(dev, sizeof(*(dev->pins)), GFP_KERNEL);
if (!dev->pins)
return -ENOMEM;
dev->pins->p = devm_pinctrl_get(dev);
if (IS_ERR(dev->pins->p)) {
dev_dbg(dev, "no pinctrl handle\n");
ret = PTR_ERR(dev->pins->p);
goto cleanup_alloc;
dev->pins->default_state = pinctrl_lookup_state(dev->pins->p,
if (IS_ERR(dev->pins->default_state)) {
dev_dbg(dev, "no default pinctrl state\n");
ret = 0;
goto cleanup_get;
ret = pinctrl_select_state(dev->pins->p, dev->pins->default_state);
if (ret) {
dev_dbg(dev, "failed to activate default pinctrl state\n");
goto cleanup_get;
#ifdef CONFIG_PM
* If power management is enabled, we also look for the optional
* sleep and idle pin states, with semantics as defined in
* <linux/pinctrl/pinctrl-state.h>
dev->pins->sleep_state = pinctrl_lookup_state(dev->pins->p,
if (IS_ERR(dev->pins->sleep_state))
/* Not supplying this state is perfectly legal */
dev_dbg(dev, "no sleep pinctrl state\n");
dev->pins->idle_state = pinctrl_lookup_state(dev->pins->p,
if (IS_ERR(dev->pins->idle_state))
/* Not supplying this state is perfectly legal */
dev_dbg(dev, "no idle pinctrl state\n");
return 0;
* If no pinctrl handle or default state was found for this device,
* let's explicitly free the pin container in the device, there is
* no point in keeping it around.
devm_kfree(dev, dev->pins);
dev->pins = NULL;
/* Only return deferrals */
if (ret != -EPROBE_DEFER)
ret = 0;
return ret;