1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2014 Linaro Ltd.
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Author: Ulf Hansson <ulf.hansson@linaro.org>
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Implements PM domains using the generic PM domain for ux500.
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun #include <linux/printk.h>
10*4882a593Smuzhiyun #include <linux/slab.h>
11*4882a593Smuzhiyun #include <linux/err.h>
12*4882a593Smuzhiyun #include <linux/of.h>
13*4882a593Smuzhiyun #include <linux/pm_domain.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #include <dt-bindings/arm/ux500_pm_domains.h>
16*4882a593Smuzhiyun #include "pm_domains.h"
17*4882a593Smuzhiyun
pd_power_off(struct generic_pm_domain * domain)18*4882a593Smuzhiyun static int pd_power_off(struct generic_pm_domain *domain)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun /*
21*4882a593Smuzhiyun * Handle the gating of the PM domain regulator here.
22*4882a593Smuzhiyun *
23*4882a593Smuzhiyun * Drivers/subsystems handling devices in the PM domain needs to perform
24*4882a593Smuzhiyun * register context save/restore from their respective runtime PM
25*4882a593Smuzhiyun * callbacks, to be able to enable PM domain gating/ungating.
26*4882a593Smuzhiyun */
27*4882a593Smuzhiyun return 0;
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
pd_power_on(struct generic_pm_domain * domain)30*4882a593Smuzhiyun static int pd_power_on(struct generic_pm_domain *domain)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun /*
33*4882a593Smuzhiyun * Handle the ungating of the PM domain regulator here.
34*4882a593Smuzhiyun *
35*4882a593Smuzhiyun * Drivers/subsystems handling devices in the PM domain needs to perform
36*4882a593Smuzhiyun * register context save/restore from their respective runtime PM
37*4882a593Smuzhiyun * callbacks, to be able to enable PM domain gating/ungating.
38*4882a593Smuzhiyun */
39*4882a593Smuzhiyun return 0;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun static struct generic_pm_domain ux500_pm_domain_vape = {
43*4882a593Smuzhiyun .name = "VAPE",
44*4882a593Smuzhiyun .power_off = pd_power_off,
45*4882a593Smuzhiyun .power_on = pd_power_on,
46*4882a593Smuzhiyun };
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun static struct generic_pm_domain *ux500_pm_domains[NR_DOMAINS] = {
49*4882a593Smuzhiyun [DOMAIN_VAPE] = &ux500_pm_domain_vape,
50*4882a593Smuzhiyun };
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun static const struct of_device_id ux500_pm_domain_matches[] __initconst = {
53*4882a593Smuzhiyun { .compatible = "stericsson,ux500-pm-domains", },
54*4882a593Smuzhiyun { },
55*4882a593Smuzhiyun };
56*4882a593Smuzhiyun
ux500_pm_domains_init(void)57*4882a593Smuzhiyun int __init ux500_pm_domains_init(void)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun struct device_node *np;
60*4882a593Smuzhiyun struct genpd_onecell_data *genpd_data;
61*4882a593Smuzhiyun int i;
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun np = of_find_matching_node(NULL, ux500_pm_domain_matches);
64*4882a593Smuzhiyun if (!np)
65*4882a593Smuzhiyun return -ENODEV;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun genpd_data = kzalloc(sizeof(*genpd_data), GFP_KERNEL);
68*4882a593Smuzhiyun if (!genpd_data)
69*4882a593Smuzhiyun return -ENOMEM;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun genpd_data->domains = ux500_pm_domains;
72*4882a593Smuzhiyun genpd_data->num_domains = ARRAY_SIZE(ux500_pm_domains);
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun for (i = 0; i < ARRAY_SIZE(ux500_pm_domains); ++i)
75*4882a593Smuzhiyun pm_genpd_init(ux500_pm_domains[i], NULL, false);
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun of_genpd_add_provider_onecell(np, genpd_data);
78*4882a593Smuzhiyun return 0;
79*4882a593Smuzhiyun }
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