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); 95