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authorUlf Hansson <ulf.hansson@linaro.org>2019-10-28 16:32:23 +0100
committerUlf Hansson <ulf.hansson@linaro.org>2020-01-02 16:50:24 +0100
commita5e0454cf3920f1e5ec1fae71783e576ea9b1318 (patch)
tree858c2fe0d61148394421ae5f47599e71d32035a7
parentf08cfbfa4fb1b5cf15d9f3d3f8ef2280236f4a12 (diff)
cpuidle: psci: Add a helper to attach a CPU to its PM domain
Introduce a PSCI DT helper function, psci_dt_attach_cpu(), which takes a CPU number as an in-parameter and tries to attach the CPU's struct device to its corresponding PM domain. Let's makes use of dev_pm_domain_attach_by_name(), as it allows us to specify "psci" as the "name" of the PM domain to attach to. Additionally, let's also prepare the attached device to be power managed via runtime PM. Note that, the implementation of the new helper function is in a new separate c-file, which may seems a bit too much at this point. However, subsequent changes that implements the remaining part of the PM domain support for cpuidle-psci, helps to justify this split. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Rafael J. Wysocki <rafael@kernel.org>
-rw-r--r--drivers/cpuidle/Makefile4
-rw-r--r--drivers/cpuidle/cpuidle-psci-domain.c31
-rw-r--r--drivers/cpuidle/cpuidle-psci.h12
3 files changed, 46 insertions, 1 deletions
diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
index ee70d5cc5b99..cc8c769d7fa9 100644
--- a/drivers/cpuidle/Makefile
+++ b/drivers/cpuidle/Makefile
@@ -21,7 +21,9 @@ obj-$(CONFIG_ARM_U8500_CPUIDLE) += cpuidle-ux500.o
obj-$(CONFIG_ARM_AT91_CPUIDLE) += cpuidle-at91.o
obj-$(CONFIG_ARM_EXYNOS_CPUIDLE) += cpuidle-exynos.o
obj-$(CONFIG_ARM_CPUIDLE) += cpuidle-arm.o
-obj-$(CONFIG_ARM_PSCI_CPUIDLE) += cpuidle-psci.o
+obj-$(CONFIG_ARM_PSCI_CPUIDLE) += cpuidle_psci.o
+cpuidle_psci-y := cpuidle-psci.o
+cpuidle_psci-$(CONFIG_PM_GENERIC_DOMAINS_OF) += cpuidle-psci-domain.o
###############################################################################
# MIPS drivers
diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c
new file mode 100644
index 000000000000..87f881c21af1
--- /dev/null
+++ b/drivers/cpuidle/cpuidle-psci-domain.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PM domains for CPUs via genpd - managed by cpuidle-psci.
+ *
+ * Copyright (C) 2019 Linaro Ltd.
+ * Author: Ulf Hansson <ulf.hansson@linaro.org>
+ *
+ */
+
+#include <linux/cpu.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
+
+#include "cpuidle-psci.h"
+
+struct device __init *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);
+
+ return dev;
+}
diff --git a/drivers/cpuidle/cpuidle-psci.h b/drivers/cpuidle/cpuidle-psci.h
new file mode 100644
index 000000000000..8609482cf490
--- /dev/null
+++ b/drivers/cpuidle/cpuidle-psci.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __CPUIDLE_PSCI_H
+#define __CPUIDLE_PSCI_H
+
+#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
+struct device __init *psci_dt_attach_cpu(int cpu);
+#else
+static inline struct device __init *psci_dt_attach_cpu(int cpu) { return NULL; }
+#endif
+
+#endif /* __CPUIDLE_PSCI_H */