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/printk.h>
10 #include <linux/slab.h>
11 #include <linux/err.h>
12 #include <linux/of.h>
13 #include <linux/pm_domain.h>
14
15 #include <dt-bindings/arm/ux500_pm_domains.h>
16 #include "pm_domains.h"
17
pd_power_off(struct generic_pm_domain * domain)18 static int pd_power_off(struct generic_pm_domain *domain)
19 {
20 /*
21 * Handle the gating of the PM domain regulator here.
22 *
23 * Drivers/subsystems handling devices in the PM domain needs to perform
24 * register context save/restore from their respective runtime PM
25 * callbacks, to be able to enable PM domain gating/ungating.
26 */
27 return 0;
28 }
29
pd_power_on(struct generic_pm_domain * domain)30 static int pd_power_on(struct generic_pm_domain *domain)
31 {
32 /*
33 * Handle the ungating of the PM domain regulator here.
34 *
35 * Drivers/subsystems handling devices in the PM domain needs to perform
36 * register context save/restore from their respective runtime PM
37 * callbacks, to be able to enable PM domain gating/ungating.
38 */
39 return 0;
40 }
41
42 static struct generic_pm_domain ux500_pm_domain_vape = {
43 .name = "VAPE",
44 .power_off = pd_power_off,
45 .power_on = pd_power_on,
46 };
47
48 static struct generic_pm_domain *ux500_pm_domains[NR_DOMAINS] = {
49 [DOMAIN_VAPE] = &ux500_pm_domain_vape,
50 };
51
52 static const struct of_device_id ux500_pm_domain_matches[] __initconst = {
53 { .compatible = "stericsson,ux500-pm-domains", },
54 { },
55 };
56
ux500_pm_domains_init(void)57 int __init ux500_pm_domains_init(void)
58 {
59 struct device_node *np;
60 struct genpd_onecell_data *genpd_data;
61 int i;
62
63 np = of_find_matching_node(NULL, ux500_pm_domain_matches);
64 if (!np)
65 return -ENODEV;
66
67 genpd_data = kzalloc(sizeof(*genpd_data), GFP_KERNEL);
68 if (!genpd_data)
69 return -ENOMEM;
70
71 genpd_data->domains = ux500_pm_domains;
72 genpd_data->num_domains = ARRAY_SIZE(ux500_pm_domains);
73
74 for (i = 0; i < ARRAY_SIZE(ux500_pm_domains); ++i)
75 pm_genpd_init(ux500_pm_domains[i], NULL, false);
76
77 of_genpd_add_provider_onecell(np, genpd_data);
78 return 0;
79 }
80