/* * 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 <linus.walleij@linaro.org> * * 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; 	if (dev->of_node_reused)		return 0; 	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,					PINCTRL_STATE_DEFAULT);	if (IS_ERR(dev->pins->default_state)) {		dev_dbg(dev, "no default pinctrl state\n");		ret = 0;		goto cleanup_get;	} 	dev->pins->init_state = pinctrl_lookup_state(dev->pins->p,					PINCTRL_STATE_INIT);	if (IS_ERR(dev->pins->init_state)) {		/* Not supplying this state is perfectly legal */		dev_dbg(dev, "no init pinctrl state\n"); 		ret = pinctrl_select_state(dev->pins->p,					   dev->pins->default_state);	} else {		ret = pinctrl_select_state(dev->pins->p, dev->pins->init_state);	} 	if (ret) {		dev_dbg(dev, "failed to activate initial 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,					PINCTRL_STATE_SLEEP);	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,					PINCTRL_STATE_IDLE);	if (IS_ERR(dev->pins->idle_state))		/* Not supplying this state is perfectly legal */		dev_dbg(dev, "no idle pinctrl state\n");#endif 	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.	 */cleanup_get:	devm_pinctrl_put(dev->pins->p);cleanup_alloc:	devm_kfree(dev, dev->pins);	dev->pins = NULL; 	/* Return deferrals */	if (ret == -EPROBE_DEFER)		return ret;	/* Return serious errors */	if (ret == -EINVAL)		return ret;	/* We ignore errors like -ENOENT meaning no pinctrl state */ 	return 0;}