Merge tag 'fscrypt-for-linus' of git://git.kernel.org/pub/scm/fs/fscrypt/fscrypt
[linux-2.6-microblaze.git] / drivers / base / pinctrl.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Driver core interface to the pinctrl subsystem.
4  *
5  * Copyright (C) 2012 ST-Ericsson SA
6  * Written on behalf of Linaro for ST-Ericsson
7  * Based on bits of regulator core, gpio core and clk core
8  *
9  * Author: Linus Walleij <linus.walleij@linaro.org>
10  */
11
12 #include <linux/device.h>
13 #include <linux/pinctrl/devinfo.h>
14 #include <linux/pinctrl/consumer.h>
15 #include <linux/slab.h>
16
17 /**
18  * pinctrl_bind_pins() - called by the device core before probe
19  * @dev: the device that is just about to probe
20  */
21 int pinctrl_bind_pins(struct device *dev)
22 {
23         int ret;
24
25         if (dev->of_node_reused)
26                 return 0;
27
28         dev->pins = devm_kzalloc(dev, sizeof(*(dev->pins)), GFP_KERNEL);
29         if (!dev->pins)
30                 return -ENOMEM;
31
32         dev->pins->p = devm_pinctrl_get(dev);
33         if (IS_ERR(dev->pins->p)) {
34                 dev_dbg(dev, "no pinctrl handle\n");
35                 ret = PTR_ERR(dev->pins->p);
36                 goto cleanup_alloc;
37         }
38
39         dev->pins->default_state = pinctrl_lookup_state(dev->pins->p,
40                                         PINCTRL_STATE_DEFAULT);
41         if (IS_ERR(dev->pins->default_state)) {
42                 dev_dbg(dev, "no default pinctrl state\n");
43                 ret = 0;
44                 goto cleanup_get;
45         }
46
47         dev->pins->init_state = pinctrl_lookup_state(dev->pins->p,
48                                         PINCTRL_STATE_INIT);
49         if (IS_ERR(dev->pins->init_state)) {
50                 /* Not supplying this state is perfectly legal */
51                 dev_dbg(dev, "no init pinctrl state\n");
52
53                 ret = pinctrl_select_state(dev->pins->p,
54                                            dev->pins->default_state);
55         } else {
56                 ret = pinctrl_select_state(dev->pins->p, dev->pins->init_state);
57         }
58
59         if (ret) {
60                 dev_dbg(dev, "failed to activate initial pinctrl state\n");
61                 goto cleanup_get;
62         }
63
64 #ifdef CONFIG_PM
65         /*
66          * If power management is enabled, we also look for the optional
67          * sleep and idle pin states, with semantics as defined in
68          * <linux/pinctrl/pinctrl-state.h>
69          */
70         dev->pins->sleep_state = pinctrl_lookup_state(dev->pins->p,
71                                         PINCTRL_STATE_SLEEP);
72         if (IS_ERR(dev->pins->sleep_state))
73                 /* Not supplying this state is perfectly legal */
74                 dev_dbg(dev, "no sleep pinctrl state\n");
75
76         dev->pins->idle_state = pinctrl_lookup_state(dev->pins->p,
77                                         PINCTRL_STATE_IDLE);
78         if (IS_ERR(dev->pins->idle_state))
79                 /* Not supplying this state is perfectly legal */
80                 dev_dbg(dev, "no idle pinctrl state\n");
81 #endif
82
83         return 0;
84
85         /*
86          * If no pinctrl handle or default state was found for this device,
87          * let's explicitly free the pin container in the device, there is
88          * no point in keeping it around.
89          */
90 cleanup_get:
91         devm_pinctrl_put(dev->pins->p);
92 cleanup_alloc:
93         devm_kfree(dev, dev->pins);
94         dev->pins = NULL;
95
96         /* Return deferrals */
97         if (ret == -EPROBE_DEFER)
98                 return ret;
99         /* Return serious errors */
100         if (ret == -EINVAL)
101                 return ret;
102         /* We ignore errors like -ENOENT meaning no pinctrl state */
103
104         return 0;
105 }