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3282570990
Now that the SPDX tag is in all driver core files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Johannes Berg <johannes@sipsolutions.net> Cc: "Luis R. Rodriguez" <mcgrof@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
106 lines
2.7 KiB
C
106 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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#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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