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1// SPDX-License-Identifier: GPL-2.0-only2/*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 20static 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 perform26 * register context save/restore from their respective runtime PM27 * callbacks, to be able to enable PM domain gating/ungating.28 */29 return 0;30}31 32static 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 perform38 * register context save/restore from their respective runtime PM39 * callbacks, to be able to enable PM domain gating/ungating.40 */41 return 0;42}43 44static 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 50static struct generic_pm_domain *ux500_pm_domains[NR_DOMAINS] = {51 [DOMAIN_VAPE] = &ux500_pm_domain_vape,52};53 54static const struct of_device_id ux500_pm_domain_matches[] = {55 { .compatible = "stericsson,ux500-pm-domains", },56 { },57};58 59static 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 82static 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 90static int __init ux500_pm_domains_init(void)91{92 return platform_driver_register(&ux500_pm_domains_driver);93}94arch_initcall(ux500_pm_domains_init);95