dm: core: Introduce dev_read_alias_highest_id()
[oweals/u-boot.git] / drivers / pwm / sandbox_pwm.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2015 Google, Inc
4  * Written by Simon Glass <sjg@chromium.org>
5  */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <errno.h>
10 #include <pwm.h>
11 #include <asm/test.h>
12
13 enum {
14         NUM_CHANNELS    = 3,
15 };
16
17 /**
18  * struct sandbox_pwm_chan - a sandbox PWM channel
19  *
20  * @period_ns: Period of the PWM in nanoseconds
21  * @duty_ns: Current duty cycle of the PWM in nanoseconds
22  * @enable: true if the PWM is enabled
23  * @polarity: true if the PWM polarity is active high
24  */
25 struct sandbox_pwm_chan {
26         uint period_ns;
27         uint duty_ns;
28         bool enable;
29         bool polarity;
30 };
31
32 struct sandbox_pwm_priv {
33         struct sandbox_pwm_chan chan[NUM_CHANNELS];
34 };
35
36 int sandbox_pwm_get_config(struct udevice *dev, uint channel, uint *period_nsp,
37                            uint *duty_nsp, bool *enablep, bool *polarityp)
38 {
39         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
40         struct sandbox_pwm_chan *chan;
41
42         if (channel >= NUM_CHANNELS)
43                 return -ENOSPC;
44         chan = &priv->chan[channel];
45         *period_nsp = chan->period_ns;
46         *duty_nsp = chan->duty_ns;
47         *enablep = chan->enable;
48         *polarityp = chan->polarity;
49
50         return 0;
51 }
52
53 static int sandbox_pwm_set_config(struct udevice *dev, uint channel,
54                                   uint period_ns, uint duty_ns)
55 {
56         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
57         struct sandbox_pwm_chan *chan;
58
59         if (channel >= NUM_CHANNELS)
60                 return -ENOSPC;
61         chan = &priv->chan[channel];
62         chan->period_ns = period_ns;
63         chan->duty_ns = duty_ns;
64
65         return 0;
66 }
67
68 static int sandbox_pwm_set_enable(struct udevice *dev, uint channel,
69                                   bool enable)
70 {
71         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
72         struct sandbox_pwm_chan *chan;
73
74         if (channel >= NUM_CHANNELS)
75                 return -ENOSPC;
76         chan = &priv->chan[channel];
77         chan->enable = enable;
78
79         return 0;
80 }
81
82 static int sandbox_pwm_set_invert(struct udevice *dev, uint channel,
83                                   bool polarity)
84 {
85         struct sandbox_pwm_priv *priv = dev_get_priv(dev);
86         struct sandbox_pwm_chan *chan;
87
88         if (channel >= NUM_CHANNELS)
89                 return -ENOSPC;
90         chan = &priv->chan[channel];
91         chan->polarity = polarity;
92
93         return 0;
94 }
95
96 static const struct pwm_ops sandbox_pwm_ops = {
97         .set_config     = sandbox_pwm_set_config,
98         .set_enable     = sandbox_pwm_set_enable,
99         .set_invert     = sandbox_pwm_set_invert,
100 };
101
102 static const struct udevice_id sandbox_pwm_ids[] = {
103         { .compatible = "sandbox,pwm" },
104         { }
105 };
106
107 U_BOOT_DRIVER(warm_pwm_sandbox) = {
108         .name           = "pwm_sandbox",
109         .id             = UCLASS_PWM,
110         .of_match       = sandbox_pwm_ids,
111         .ops            = &sandbox_pwm_ops,
112         .priv_auto_alloc_size   = sizeof(struct sandbox_pwm_priv),
113 };