Commit | Line | Data |
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989d42e8 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ab78029e LW |
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> | |
ab78029e LW |
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 | ||
ed032c1b JH |
25 | if (dev->of_node_reused) |
26 | return 0; | |
27 | ||
ab78029e LW |
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 | ||
ef0eebc0 DA |
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 | ||
ab78029e | 59 | if (ret) { |
ef0eebc0 | 60 | dev_dbg(dev, "failed to activate initial pinctrl state\n"); |
ab78029e LW |
61 | goto cleanup_get; |
62 | } | |
63 | ||
14005ee2 LW |
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 | ||
ab78029e LW |
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 | ||
eb4ec68a D |
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 */ | |
ab78029e | 103 | |
eb4ec68a | 104 | return 0; |
ab78029e | 105 | } |