1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2014 Linaro Ltd.
4  *
5  * Author: Ulf Hansson <ulf.hansson@linaro.org>
6  *
7  * Implements PM domains using the generic PM domain for ux500.
8  */
9 #include <linux/device.h>
10 #include <linux/kernel.h>
11 #include <linux/platform_device.h>
12 #include <linux/printk.h>
13 #include <linux/slab.h>
14 #include <linux/err.h>
15 #include <linux/of.h>
16 #include <linux/pm_domain.h>
17 
18 #include <dt-bindings/arm/ux500_pm_domains.h>
19 
20 static int pd_power_off(struct generic_pm_domain *domain)
21 {
22 	/*
23 	 * Handle the gating of the PM domain regulator here.
24 	 *
25 	 * Drivers/subsystems handling devices in the PM domain needs to perform
26 	 * register context save/restore from their respective runtime PM
27 	 * callbacks, to be able to enable PM domain gating/ungating.
28 	 */
29 	return 0;
30 }
31 
32 static int pd_power_on(struct generic_pm_domain *domain)
33 {
34 	/*
35 	 * Handle the ungating of the PM domain regulator here.
36 	 *
37 	 * Drivers/subsystems handling devices in the PM domain needs to perform
38 	 * register context save/restore from their respective runtime PM
39 	 * callbacks, to be able to enable PM domain gating/ungating.
40 	 */
41 	return 0;
42 }
43 
44 static struct generic_pm_domain ux500_pm_domain_vape = {
45 	.name = "VAPE",
46 	.power_off = pd_power_off,
47 	.power_on = pd_power_on,
48 };
49 
50 static struct generic_pm_domain *ux500_pm_domains[NR_DOMAINS] = {
51 	[DOMAIN_VAPE] = &ux500_pm_domain_vape,
52 };
53 
54 static const struct of_device_id ux500_pm_domain_matches[] = {
55 	{ .compatible = "stericsson,ux500-pm-domains", },
56 	{ },
57 };
58 
59 static int ux500_pm_domains_probe(struct platform_device *pdev)
60 {
61 	struct device_node *np = pdev->dev.of_node;
62 	struct genpd_onecell_data *genpd_data;
63 	int i;
64 
65 	if (!np)
66 		return -ENODEV;
67 
68 	genpd_data = kzalloc(sizeof(*genpd_data), GFP_KERNEL);
69 	if (!genpd_data)
70 		return -ENOMEM;
71 
72 	genpd_data->domains = ux500_pm_domains;
73 	genpd_data->num_domains = ARRAY_SIZE(ux500_pm_domains);
74 
75 	for (i = 0; i < ARRAY_SIZE(ux500_pm_domains); ++i)
76 		pm_genpd_init(ux500_pm_domains[i], NULL, false);
77 
78 	of_genpd_add_provider_onecell(np, genpd_data);
79 	return 0;
80 }
81 
82 static struct platform_driver ux500_pm_domains_driver = {
83 	.probe  = ux500_pm_domains_probe,
84 	.driver = {
85 		.name = "ux500_pm_domains",
86 		.of_match_table = ux500_pm_domain_matches,
87 	},
88 };
89 
90 static int __init ux500_pm_domains_init(void)
91 {
92 	return platform_driver_register(&ux500_pm_domains_driver);
93 }
94 arch_initcall(ux500_pm_domains_init);
95