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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108// SPDX-License-Identifier: GPL-2.0/* * 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> */
#include <linux/device.h>#include <linux/pinctrl/devinfo.h>#include <linux/pinctrl/consumer.h>#include <linux/slab.h>
#include "base.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(dev)) 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;}