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, size: 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(ptr: dev->pins->p)) { |
34 | dev_dbg(dev, "no pinctrl handle\n" ); |
35 | ret = PTR_ERR(ptr: dev->pins->p); |
36 | goto cleanup_alloc; |
37 | } |
38 | |
39 | dev->pins->default_state = pinctrl_lookup_state(p: dev->pins->p, |
40 | PINCTRL_STATE_DEFAULT); |
41 | if (IS_ERR(ptr: 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(p: dev->pins->p, |
48 | PINCTRL_STATE_INIT); |
49 | if (IS_ERR(ptr: 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(p: dev->pins->p, |
54 | s: dev->pins->default_state); |
55 | } else { |
56 | ret = pinctrl_select_state(p: dev->pins->p, s: 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(p: dev->pins->p, |
71 | PINCTRL_STATE_SLEEP); |
72 | if (IS_ERR(ptr: 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(p: dev->pins->p, |
77 | PINCTRL_STATE_IDLE); |
78 | if (IS_ERR(ptr: 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(p: dev->pins->p); |
92 | cleanup_alloc: |
93 | devm_kfree(dev, p: 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 | } |
106 | |