LXR linux/arch/arm/mach-ux500/pm

   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
  18static 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
  30static 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
  42static 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
  48static struct generic_pm_domain *ux500_pm_domains[NR_DOMAINS] = {
  49        [DOMAIN_VAPE] = &ux500_pm_domain_vape,
  50};
  51
  52static const struct of_device_id ux500_pm_domain_matches[] __initconst = {
  53        { .compatible = "stericsson,ux500-pm-domains", },
  54        { },
  55};
  56
  57int __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