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989d42e85d
It's good to have SPDX identifiers in all files to make it easier to audit the kernel tree for correct licenses. Update the driver core files files with the correct SPDX license identifier based on the license text in the file itself. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This work is based on a script and data from Thomas Gleixner, Philippe Ombredanne, and Kate Stewart. Cc: Johannes Berg <johannes@sipsolutions.net> Cc: "Luis R. Rodriguez" <mcgrof@kernel.org> Cc: William Breathitt Gray <vilhelm.gray@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver core interface to the pinctrl subsystem.
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*
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* Copyright (C) 2012 ST-Ericsson SA
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* Written on behalf of Linaro for ST-Ericsson
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* Based on bits of regulator core, gpio core and clk core
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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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#include <linux/device.h>
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#include <linux/pinctrl/devinfo.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/slab.h>
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/**
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* pinctrl_bind_pins() - called by the device core before probe
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* @dev: the device that is just about to probe
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*/
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int pinctrl_bind_pins(struct device *dev)
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{
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int ret;
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if (dev->of_node_reused)
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return 0;
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dev->pins = devm_kzalloc(dev, sizeof(*(dev->pins)), GFP_KERNEL);
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if (!dev->pins)
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return -ENOMEM;
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dev->pins->p = devm_pinctrl_get(dev);
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if (IS_ERR(dev->pins->p)) {
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dev_dbg(dev, "no pinctrl handle\n");
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ret = PTR_ERR(dev->pins->p);
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goto cleanup_alloc;
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}
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dev->pins->default_state = pinctrl_lookup_state(dev->pins->p,
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PINCTRL_STATE_DEFAULT);
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if (IS_ERR(dev->pins->default_state)) {
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dev_dbg(dev, "no default pinctrl state\n");
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ret = 0;
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goto cleanup_get;
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}
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dev->pins->init_state = pinctrl_lookup_state(dev->pins->p,
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PINCTRL_STATE_INIT);
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if (IS_ERR(dev->pins->init_state)) {
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/* Not supplying this state is perfectly legal */
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dev_dbg(dev, "no init pinctrl state\n");
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ret = pinctrl_select_state(dev->pins->p,
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dev->pins->default_state);
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} else {
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ret = pinctrl_select_state(dev->pins->p, dev->pins->init_state);
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}
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if (ret) {
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dev_dbg(dev, "failed to activate initial pinctrl state\n");
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goto cleanup_get;
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}
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#ifdef CONFIG_PM
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/*
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* If power management is enabled, we also look for the optional
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* sleep and idle pin states, with semantics as defined in
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* <linux/pinctrl/pinctrl-state.h>
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*/
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dev->pins->sleep_state = pinctrl_lookup_state(dev->pins->p,
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PINCTRL_STATE_SLEEP);
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if (IS_ERR(dev->pins->sleep_state))
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/* Not supplying this state is perfectly legal */
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dev_dbg(dev, "no sleep pinctrl state\n");
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dev->pins->idle_state = pinctrl_lookup_state(dev->pins->p,
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PINCTRL_STATE_IDLE);
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if (IS_ERR(dev->pins->idle_state))
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/* Not supplying this state is perfectly legal */
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dev_dbg(dev, "no idle pinctrl state\n");
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#endif
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return 0;
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/*
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* If no pinctrl handle or default state was found for this device,
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* let's explicitly free the pin container in the device, there is
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* no point in keeping it around.
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*/
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cleanup_get:
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devm_pinctrl_put(dev->pins->p);
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cleanup_alloc:
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devm_kfree(dev, dev->pins);
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dev->pins = NULL;
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/* Return deferrals */
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if (ret == -EPROBE_DEFER)
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return ret;
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/* Return serious errors */
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if (ret == -EINVAL)
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return ret;
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/* We ignore errors like -ENOENT meaning no pinctrl state */
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return 0;
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}
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