@@ -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
new file mode 100644
@@ -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 *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;
+}
new file mode 100644
@@ -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 *psci_dt_attach_cpu(int cpu);
+#else
+static inline struct device *psci_dt_attach_cpu(int cpu) { return NULL; }
+#endif
+
+#endif /* __CPUIDLE_PSCI_H */
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> --- Changes in v4: - Drop check for OSI support in psci_dt_attach_cpu(). --- drivers/cpuidle/Makefile | 4 +++- drivers/cpuidle/cpuidle-psci-domain.c | 31 +++++++++++++++++++++++++++ drivers/cpuidle/cpuidle-psci.h | 12 +++++++++++ 3 files changed, 46 insertions(+), 1 deletion(-) create mode 100644 drivers/cpuidle/cpuidle-psci-domain.c create mode 100644 drivers/cpuidle/cpuidle-psci.h -- 2.17.1