drivers/genpd/st/ste-ux500-pm-domain.c

   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);