[RFC PATCH 5/8] cpuidle: Factor-out power domain related code from PSCI domain driver
From: Anup Patel
Date: Sun Feb 21 2021 - 04:42:26 EST
The generic power domain related code in PSCI domain driver is largely
independent of PSCI and can be shared with RISC-V SBI domain driver
hence we factor-out this code into dt_idle_genpd.c and dt_idle_genpd.h.
Signed-off-by: Anup Patel <anup.patel@xxxxxxx>
---
drivers/cpuidle/Kconfig | 4 +
drivers/cpuidle/Kconfig.arm | 1 +
drivers/cpuidle/Makefile | 1 +
drivers/cpuidle/cpuidle-psci-domain.c | 244 +-----------------
drivers/cpuidle/cpuidle-psci.h | 15 +-
...{cpuidle-psci-domain.c => dt_idle_genpd.c} | 165 ++++--------
drivers/cpuidle/dt_idle_genpd.h | 42 +++
7 files changed, 121 insertions(+), 351 deletions(-)
copy drivers/cpuidle/{cpuidle-psci-domain.c => dt_idle_genpd.c} (52%)
create mode 100644 drivers/cpuidle/dt_idle_genpd.h
diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig
index c0aeedd66f02..f1afe7ab6b54 100644
--- a/drivers/cpuidle/Kconfig
+++ b/drivers/cpuidle/Kconfig
@@ -47,6 +47,10 @@ config CPU_IDLE_GOV_HALTPOLL
config DT_IDLE_STATES
bool
+config DT_IDLE_GENPD
+ depends on PM_GENERIC_DOMAINS_OF
+ bool
+
menu "ARM CPU Idle Drivers"
depends on ARM || ARM64
source "drivers/cpuidle/Kconfig.arm"
diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
index 0844fadc4be8..1007435ae298 100644
--- a/drivers/cpuidle/Kconfig.arm
+++ b/drivers/cpuidle/Kconfig.arm
@@ -27,6 +27,7 @@ config ARM_PSCI_CPUIDLE_DOMAIN
bool "PSCI CPU idle Domain"
depends on ARM_PSCI_CPUIDLE
depends on PM_GENERIC_DOMAINS_OF
+ select DT_IDLE_GENPD
default y
help
Select this to enable the PSCI based CPUidle driver to use PM domains,
diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
index 26bbc5e74123..11a26cef279f 100644
--- a/drivers/cpuidle/Makefile
+++ b/drivers/cpuidle/Makefile
@@ -6,6 +6,7 @@
obj-y += cpuidle.o driver.o governor.o sysfs.o governors/
obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o
obj-$(CONFIG_DT_IDLE_STATES) += dt_idle_states.o
+obj-$(CONFIG_DT_IDLE_GENPD) += dt_idle_genpd.o
obj-$(CONFIG_ARCH_HAS_CPU_RELAX) += poll_state.o
obj-$(CONFIG_HALTPOLL_CPUIDLE) += cpuidle-haltpoll.o
diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c
index ff2c3f8e4668..b0621d890ab7 100644
--- a/drivers/cpuidle/cpuidle-psci-domain.c
+++ b/drivers/cpuidle/cpuidle-psci-domain.c
@@ -16,17 +16,9 @@
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/psci.h>
-#include <linux/slab.h>
-#include <linux/string.h>
#include "cpuidle-psci.h"
-struct psci_pd_provider {
- struct list_head link;
- struct device_node *node;
-};
-
-static LIST_HEAD(psci_pd_providers);
static bool psci_pd_allow_domain_state;
static int psci_pd_power_off(struct generic_pm_domain *pd)
@@ -47,178 +39,6 @@ static int psci_pd_power_off(struct generic_pm_domain *pd)
return 0;
}
-static int psci_pd_parse_state_nodes(struct genpd_power_state *states,
- int state_count)
-{
- int i, ret;
- u32 psci_state, *psci_state_buf;
-
- for (i = 0; i < state_count; i++) {
- ret = psci_dt_parse_state_node(to_of_node(states[i].fwnode),
- &psci_state);
- if (ret)
- goto free_state;
-
- psci_state_buf = kmalloc(sizeof(u32), GFP_KERNEL);
- if (!psci_state_buf) {
- ret = -ENOMEM;
- goto free_state;
- }
- *psci_state_buf = psci_state;
- states[i].data = psci_state_buf;
- }
-
- return 0;
-
-free_state:
- i--;
- for (; i >= 0; i--)
- kfree(states[i].data);
- return ret;
-}
-
-static int psci_pd_parse_states(struct device_node *np,
- struct genpd_power_state **states, int *state_count)
-{
- int ret;
-
- /* Parse the domain idle states. */
- ret = of_genpd_parse_idle_states(np, states, state_count);
- if (ret)
- return ret;
-
- /* Fill out the PSCI specifics for each found state. */
- ret = psci_pd_parse_state_nodes(*states, *state_count);
- if (ret)
- kfree(*states);
-
- return ret;
-}
-
-static void psci_pd_free_states(struct genpd_power_state *states,
- unsigned int state_count)
-{
- int i;
-
- for (i = 0; i < state_count; i++)
- kfree(states[i].data);
- kfree(states);
-}
-
-static int psci_pd_init(struct device_node *np, bool use_osi)
-{
- struct generic_pm_domain *pd;
- struct psci_pd_provider *pd_provider;
- struct dev_power_governor *pd_gov;
- struct genpd_power_state *states = NULL;
- int ret = -ENOMEM, state_count = 0;
-
- pd = kzalloc(sizeof(*pd), GFP_KERNEL);
- if (!pd)
- goto out;
-
- pd_provider = kzalloc(sizeof(*pd_provider), GFP_KERNEL);
- if (!pd_provider)
- goto free_pd;
-
- pd->name = kasprintf(GFP_KERNEL, "%pOF", np);
- if (!pd->name)
- goto free_pd_prov;
-
- /*
- * Parse the domain idle states and let genpd manage the state selection
- * for those being compatible with "domain-idle-state".
- */
- ret = psci_pd_parse_states(np, &states, &state_count);
- if (ret)
- goto free_name;
-
- pd->free_states = psci_pd_free_states;
- pd->name = kbasename(pd->name);
- pd->states = states;
- pd->state_count = state_count;
- pd->flags |= GENPD_FLAG_IRQ_SAFE | GENPD_FLAG_CPU_DOMAIN;
-
- /* Allow power off when OSI has been successfully enabled. */
- if (use_osi)
- pd->power_off = psci_pd_power_off;
- else
- pd->flags |= GENPD_FLAG_ALWAYS_ON;
-
- /* Use governor for CPU PM domains if it has some states to manage. */
- pd_gov = state_count > 0 ? &pm_domain_cpu_gov : NULL;
-
- ret = pm_genpd_init(pd, pd_gov, false);
- if (ret) {
- psci_pd_free_states(states, state_count);
- goto free_name;
- }
-
- ret = of_genpd_add_provider_simple(np, pd);
- if (ret)
- goto remove_pd;
-
- pd_provider->node = of_node_get(np);
- list_add(&pd_provider->link, &psci_pd_providers);
-
- pr_debug("init PM domain %s\n", pd->name);
- return 0;
-
-remove_pd:
- pm_genpd_remove(pd);
-free_name:
- kfree(pd->name);
-free_pd_prov:
- kfree(pd_provider);
-free_pd:
- kfree(pd);
-out:
- pr_err("failed to init PM domain ret=%d %pOF\n", ret, np);
- return ret;
-}
-
-static void psci_pd_remove(void)
-{
- struct psci_pd_provider *pd_provider, *it;
- struct generic_pm_domain *genpd;
-
- list_for_each_entry_safe(pd_provider, it, &psci_pd_providers, link) {
- of_genpd_del_provider(pd_provider->node);
-
- genpd = of_genpd_remove_last(pd_provider->node);
- if (!IS_ERR(genpd))
- kfree(genpd);
-
- of_node_put(pd_provider->node);
- list_del(&pd_provider->link);
- kfree(pd_provider);
- }
-}
-
-static int psci_pd_init_topology(struct device_node *np)
-{
- struct device_node *node;
- struct of_phandle_args child, parent;
- int ret;
-
- for_each_child_of_node(np, node) {
- if (of_parse_phandle_with_args(node, "power-domains",
- "#power-domain-cells", 0, &parent))
- continue;
-
- child.np = node;
- child.args_count = 0;
- ret = of_genpd_add_subdomain(&parent, &child);
- of_node_put(parent.np);
- if (ret) {
- of_node_put(node);
- return ret;
- }
- }
-
- return 0;
-}
-
static bool psci_pd_try_set_osi_mode(void)
{
int ret;
@@ -244,6 +64,10 @@ static void psci_cpuidle_domain_sync_state(struct device *dev)
psci_pd_allow_domain_state = true;
}
+static struct dt_idle_genpd_ops psci_genpd_ops = {
+ .parse_state_node = psci_dt_parse_state_node,
+};
+
static const struct of_device_id psci_of_match[] = {
{ .compatible = "arm,psci-1.0" },
{}
@@ -252,48 +76,25 @@ static const struct of_device_id psci_of_match[] = {
static int psci_cpuidle_domain_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
- struct device_node *node;
bool use_osi;
- int ret = 0, pd_count = 0;
+ int ret = 0;
if (!np)
return -ENODEV;
/* If OSI mode is supported, let's try to enable it. */
use_osi = psci_pd_try_set_osi_mode();
+ if (use_osi)
+ psci_genpd_ops.power_off = psci_pd_power_off;
- /*
- * Parse child nodes for the "#power-domain-cells" property and
- * initialize a genpd/genpd-of-provider pair when it's found.
- */
- for_each_child_of_node(np, node) {
- if (!of_find_property(node, "#power-domain-cells", NULL))
- continue;
-
- ret = psci_pd_init(node, use_osi);
- if (ret)
- goto put_node;
-
- pd_count++;
- }
-
- /* Bail out if not using the hierarchical CPU topology. */
- if (!pd_count)
- goto no_pd;
-
- /* Link genpd masters/subdomains to model the CPU topology. */
- ret = psci_pd_init_topology(np);
+ /* Generic power domain probing based on DT node. */
+ ret = dt_idle_genpd_probe(&psci_genpd_ops, np);
if (ret)
- goto remove_pd;
+ goto no_pd;
pr_info("Initialized CPU PM domain topology\n");
return 0;
-put_node:
- of_node_put(node);
-remove_pd:
- psci_pd_remove();
- pr_err("failed to create CPU PM domains ret=%d\n", ret);
no_pd:
if (use_osi)
psci_set_osi_mode(false);
@@ -314,28 +115,3 @@ static int __init psci_idle_init_domains(void)
return platform_driver_register(&psci_cpuidle_domain_driver);
}
subsys_initcall(psci_idle_init_domains);
-
-struct device *psci_dt_attach_cpu(int cpu)
-{
- struct device *dev;
-
- dev = dev_pm_domain_attach_by_name(get_cpu_device(cpu), "psci");
- if (IS_ERR_OR_NULL(dev))
- return dev;
-
- pm_runtime_irq_safe(dev);
- if (cpu_online(cpu))
- pm_runtime_get_sync(dev);
-
- dev_pm_syscore_device(dev, true);
-
- return dev;
-}
-
-void psci_dt_detach_cpu(struct device *dev)
-{
- if (IS_ERR_OR_NULL(dev))
- return;
-
- dev_pm_domain_detach(dev, false);
-}
diff --git a/drivers/cpuidle/cpuidle-psci.h b/drivers/cpuidle/cpuidle-psci.h
index d8e925e84c27..70de1e3c00af 100644
--- a/drivers/cpuidle/cpuidle-psci.h
+++ b/drivers/cpuidle/cpuidle-psci.h
@@ -10,8 +10,19 @@ void psci_set_domain_state(u32 state);
int psci_dt_parse_state_node(struct device_node *np, u32 *state);
#ifdef CONFIG_ARM_PSCI_CPUIDLE_DOMAIN
-struct device *psci_dt_attach_cpu(int cpu);
-void psci_dt_detach_cpu(struct device *dev);
+
+#include "dt_idle_genpd.h"
+
+static inline struct device *psci_dt_attach_cpu(int cpu)
+{
+ return dt_idle_genpd_attach_cpu(cpu, "psci");
+}
+
+static inline void psci_dt_detach_cpu(struct device *dev)
+{
+ dt_idle_genpd_detach_cpu(dev);
+}
+
#else
static inline struct device *psci_dt_attach_cpu(int cpu) { return NULL; }
static inline void psci_dt_detach_cpu(struct device *dev) { }
diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/dt_idle_genpd.c
similarity index 52%
copy from drivers/cpuidle/cpuidle-psci-domain.c
copy to drivers/cpuidle/dt_idle_genpd.c
index ff2c3f8e4668..805c4c81d60f 100644
--- a/drivers/cpuidle/cpuidle-psci-domain.c
+++ b/drivers/cpuidle/dt_idle_genpd.c
@@ -1,71 +1,52 @@
-// SPDX-License-Identifier: GPL-2.0
+// SPDX-License-Identifier: GPL-2.0-only
/*
- * PM domains for CPUs via genpd - managed by cpuidle-psci.
+ * PM domains for CPUs via genpd.
*
* Copyright (C) 2019 Linaro Ltd.
* Author: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
*
+ * Copyright (c) 2021 Western Digital Corporation or its affiliates.
*/
-#define pr_fmt(fmt) "CPUidle PSCI: " fmt
+#define pr_fmt(fmt) "dt-idle-genpd: " fmt
#include <linux/cpu.h>
#include <linux/device.h>
#include <linux/kernel.h>
-#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
-#include <linux/psci.h>
#include <linux/slab.h>
#include <linux/string.h>
-#include "cpuidle-psci.h"
+#include "dt_idle_genpd.h"
-struct psci_pd_provider {
+struct dt_pd_provider {
struct list_head link;
struct device_node *node;
};
-static LIST_HEAD(psci_pd_providers);
-static bool psci_pd_allow_domain_state;
+static LIST_HEAD(dt_pd_providers);
-static int psci_pd_power_off(struct generic_pm_domain *pd)
-{
- struct genpd_power_state *state = &pd->states[pd->state_idx];
- u32 *pd_state;
-
- if (!state->data)
- return 0;
-
- if (!psci_pd_allow_domain_state)
- return -EBUSY;
-
- /* OSI mode is enabled, set the corresponding domain state. */
- pd_state = state->data;
- psci_set_domain_state(*pd_state);
-
- return 0;
-}
-
-static int psci_pd_parse_state_nodes(struct genpd_power_state *states,
- int state_count)
+static int dt_pd_parse_state_nodes(const struct dt_idle_genpd_ops *ops,
+ struct genpd_power_state *states,
+ int state_count)
{
int i, ret;
- u32 psci_state, *psci_state_buf;
+ u32 state, *state_buf;
for (i = 0; i < state_count; i++) {
- ret = psci_dt_parse_state_node(to_of_node(states[i].fwnode),
- &psci_state);
+ ret = ops->parse_state_node(to_of_node(states[i].fwnode),
+ &state);
if (ret)
goto free_state;
- psci_state_buf = kmalloc(sizeof(u32), GFP_KERNEL);
- if (!psci_state_buf) {
+ state_buf = kmalloc(sizeof(u32), GFP_KERNEL);
+ if (!state_buf) {
ret = -ENOMEM;
goto free_state;
}
- *psci_state_buf = psci_state;
- states[i].data = psci_state_buf;
+ *state_buf = state;
+ states[i].data = state_buf;
}
return 0;
@@ -77,8 +58,10 @@ static int psci_pd_parse_state_nodes(struct genpd_power_state *states,
return ret;
}
-static int psci_pd_parse_states(struct device_node *np,
- struct genpd_power_state **states, int *state_count)
+static int dt_pd_parse_states(const struct dt_idle_genpd_ops *ops,
+ struct device_node *np,
+ struct genpd_power_state **states,
+ int *state_count)
{
int ret;
@@ -87,15 +70,15 @@ static int psci_pd_parse_states(struct device_node *np,
if (ret)
return ret;
- /* Fill out the PSCI specifics for each found state. */
- ret = psci_pd_parse_state_nodes(*states, *state_count);
+ /* Fill out the dt specifics for each found state. */
+ ret = dt_pd_parse_state_nodes(ops, *states, *state_count);
if (ret)
kfree(*states);
return ret;
}
-static void psci_pd_free_states(struct genpd_power_state *states,
+static void dt_pd_free_states(struct genpd_power_state *states,
unsigned int state_count)
{
int i;
@@ -105,10 +88,11 @@ static void psci_pd_free_states(struct genpd_power_state *states,
kfree(states);
}
-static int psci_pd_init(struct device_node *np, bool use_osi)
+static int dt_pd_init(const struct dt_idle_genpd_ops *ops,
+ struct device_node *np)
{
struct generic_pm_domain *pd;
- struct psci_pd_provider *pd_provider;
+ struct dt_pd_provider *pd_provider;
struct dev_power_governor *pd_gov;
struct genpd_power_state *states = NULL;
int ret = -ENOMEM, state_count = 0;
@@ -129,19 +113,19 @@ static int psci_pd_init(struct device_node *np, bool use_osi)
* Parse the domain idle states and let genpd manage the state selection
* for those being compatible with "domain-idle-state".
*/
- ret = psci_pd_parse_states(np, &states, &state_count);
+ ret = dt_pd_parse_states(ops, np, &states, &state_count);
if (ret)
goto free_name;
- pd->free_states = psci_pd_free_states;
+ pd->free_states = dt_pd_free_states;
pd->name = kbasename(pd->name);
pd->states = states;
pd->state_count = state_count;
pd->flags |= GENPD_FLAG_IRQ_SAFE | GENPD_FLAG_CPU_DOMAIN;
- /* Allow power off when OSI has been successfully enabled. */
- if (use_osi)
- pd->power_off = psci_pd_power_off;
+ /* Allow power off when available. */
+ if (ops->power_off)
+ pd->power_off = ops->power_off;
else
pd->flags |= GENPD_FLAG_ALWAYS_ON;
@@ -150,7 +134,7 @@ static int psci_pd_init(struct device_node *np, bool use_osi)
ret = pm_genpd_init(pd, pd_gov, false);
if (ret) {
- psci_pd_free_states(states, state_count);
+ dt_pd_free_states(states, state_count);
goto free_name;
}
@@ -159,7 +143,7 @@ static int psci_pd_init(struct device_node *np, bool use_osi)
goto remove_pd;
pd_provider->node = of_node_get(np);
- list_add(&pd_provider->link, &psci_pd_providers);
+ list_add(&pd_provider->link, &dt_pd_providers);
pr_debug("init PM domain %s\n", pd->name);
return 0;
@@ -177,12 +161,12 @@ static int psci_pd_init(struct device_node *np, bool use_osi)
return ret;
}
-static void psci_pd_remove(void)
+static void dt_pd_remove(void)
{
- struct psci_pd_provider *pd_provider, *it;
+ struct dt_pd_provider *pd_provider, *it;
struct generic_pm_domain *genpd;
- list_for_each_entry_safe(pd_provider, it, &psci_pd_providers, link) {
+ list_for_each_entry_safe(pd_provider, it, &dt_pd_providers, link) {
of_genpd_del_provider(pd_provider->node);
genpd = of_genpd_remove_last(pd_provider->node);
@@ -195,7 +179,7 @@ static void psci_pd_remove(void)
}
}
-static int psci_pd_init_topology(struct device_node *np)
+static int dt_pd_init_topology(struct device_node *np)
{
struct device_node *node;
struct of_phandle_args child, parent;
@@ -219,49 +203,15 @@ static int psci_pd_init_topology(struct device_node *np)
return 0;
}
-static bool psci_pd_try_set_osi_mode(void)
-{
- int ret;
-
- if (!psci_has_osi_support())
- return false;
-
- ret = psci_set_osi_mode(true);
- if (ret) {
- pr_warn("failed to enable OSI mode: %d\n", ret);
- return false;
- }
-
- return true;
-}
-
-static void psci_cpuidle_domain_sync_state(struct device *dev)
+int dt_idle_genpd_probe(const struct dt_idle_genpd_ops *ops,
+ struct device_node *np)
{
- /*
- * All devices have now been attached/probed to the PM domain topology,
- * hence it's fine to allow domain states to be picked.
- */
- psci_pd_allow_domain_state = true;
-}
-
-static const struct of_device_id psci_of_match[] = {
- { .compatible = "arm,psci-1.0" },
- {}
-};
-
-static int psci_cpuidle_domain_probe(struct platform_device *pdev)
-{
- struct device_node *np = pdev->dev.of_node;
struct device_node *node;
- bool use_osi;
int ret = 0, pd_count = 0;
- if (!np)
+ if (!np || !ops || !ops->parse_state_node)
return -ENODEV;
- /* If OSI mode is supported, let's try to enable it. */
- use_osi = psci_pd_try_set_osi_mode();
-
/*
* Parse child nodes for the "#power-domain-cells" property and
* initialize a genpd/genpd-of-provider pair when it's found.
@@ -270,7 +220,7 @@ static int psci_cpuidle_domain_probe(struct platform_device *pdev)
if (!of_find_property(node, "#power-domain-cells", NULL))
continue;
- ret = psci_pd_init(node, use_osi);
+ ret = dt_pd_init(ops, node);
if (ret)
goto put_node;
@@ -282,44 +232,27 @@ static int psci_cpuidle_domain_probe(struct platform_device *pdev)
goto no_pd;
/* Link genpd masters/subdomains to model the CPU topology. */
- ret = psci_pd_init_topology(np);
+ ret = dt_pd_init_topology(np);
if (ret)
goto remove_pd;
- pr_info("Initialized CPU PM domain topology\n");
return 0;
put_node:
of_node_put(node);
remove_pd:
- psci_pd_remove();
+ dt_pd_remove();
pr_err("failed to create CPU PM domains ret=%d\n", ret);
no_pd:
- if (use_osi)
- psci_set_osi_mode(false);
return ret;
}
+EXPORT_SYMBOL_GPL(dt_idle_genpd_probe);
-static struct platform_driver psci_cpuidle_domain_driver = {
- .probe = psci_cpuidle_domain_probe,
- .driver = {
- .name = "psci-cpuidle-domain",
- .of_match_table = psci_of_match,
- .sync_state = psci_cpuidle_domain_sync_state,
- },
-};
-
-static int __init psci_idle_init_domains(void)
-{
- return platform_driver_register(&psci_cpuidle_domain_driver);
-}
-subsys_initcall(psci_idle_init_domains);
-
-struct device *psci_dt_attach_cpu(int cpu)
+struct device *dt_idle_genpd_attach_cpu(int cpu, const char *name)
{
struct device *dev;
- dev = dev_pm_domain_attach_by_name(get_cpu_device(cpu), "psci");
+ dev = dev_pm_domain_attach_by_name(get_cpu_device(cpu), name);
if (IS_ERR_OR_NULL(dev))
return dev;
@@ -331,11 +264,13 @@ struct device *psci_dt_attach_cpu(int cpu)
return dev;
}
+EXPORT_SYMBOL_GPL(dt_idle_genpd_attach_cpu);
-void psci_dt_detach_cpu(struct device *dev)
+void dt_idle_genpd_detach_cpu(struct device *dev)
{
if (IS_ERR_OR_NULL(dev))
return;
dev_pm_domain_detach(dev, false);
}
+EXPORT_SYMBOL_GPL(dt_idle_genpd_detach_cpu);
diff --git a/drivers/cpuidle/dt_idle_genpd.h b/drivers/cpuidle/dt_idle_genpd.h
new file mode 100644
index 000000000000..a3d3d2e85871
--- /dev/null
+++ b/drivers/cpuidle/dt_idle_genpd.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __DT_IDLE_GENPD
+#define __DT_IDLE_GENPD
+
+struct device_node;
+struct generic_pm_domain;
+
+struct dt_idle_genpd_ops {
+ int (*parse_state_node)(struct device_node *np, u32 *state);
+ int (*power_off)(struct generic_pm_domain *pd);
+};
+
+#ifdef CONFIG_DT_IDLE_GENPD
+
+int dt_idle_genpd_probe(const struct dt_idle_genpd_ops *ops,
+ struct device_node *np);
+
+struct device *dt_idle_genpd_attach_cpu(int cpu, const char *name);
+
+void dt_idle_genpd_detach_cpu(struct device *dev);
+
+#else
+
+int dt_idle_genpd_probe(const struct dt_idle_genpd_ops *ops,
+ struct device_node *np)
+{
+ return 0;
+}
+
+static inline struct device *dt_idle_genpd_attach_cpu(int cpu,
+ const char *name)
+{
+ return NULL;
+}
+
+static inline void dt_idle_genpd_detach_cpu(struct device *dev)
+{
+}
+
+#endif
+
+#endif
--
2.25.1