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    SubjectRe: [PATCH v8 05/21] ACPI / sleep: Introduce sleep_arm.c
    Date
    On Monday, February 02, 2015 08:45:33 PM Hanjun Guo wrote:
    > From: Graeme Gregory <graeme.gregory@linaro.org>
    >
    > ACPI 5.1 does not currently support S states for ARM64 hardware but
    > ACPI code will call acpi_target_system_state() for device power
    > managment, so introduce sleep_arm.c to allow other drivers to function
    > until S states are defined.
    >
    > CC: Rafael J. Wysocki <rjw@rjwysocki.net>
    > Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
    > Tested-by: Yijing Wang <wangyijing@huawei.com>
    > Tested-by: Mark Langsdorf <mlangsdo@redhat.com>
    > Tested-by: Jon Masters <jcm@redhat.com>
    > Tested-by: Timur Tabi <timur@codeaurora.org>
    > Signed-off-by: Graeme Gregory <graeme.gregory@linaro.org>
    > Signed-off-by: Tomasz Nowicki <tomasz.nowicki@linaro.org>
    > Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
    > ---
    > drivers/acpi/Makefile | 4 ++++
    > drivers/acpi/sleep_arm.c | 28 ++++++++++++++++++++++++++++
    > 2 files changed, 32 insertions(+)
    > create mode 100644 drivers/acpi/sleep_arm.c
    >
    > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
    > index f74317c..bcec54e 100644
    > --- a/drivers/acpi/Makefile
    > +++ b/drivers/acpi/Makefile
    > @@ -23,7 +23,11 @@ acpi-y += nvs.o
    >
    > # Power management related files
    > acpi-y += wakeup.o
    > +ifeq ($(ARCH), arm64)
    > +acpi-y += sleep_arm.o
    > +else # X86, IA64
    > acpi-y += sleep.o
    > +endif
    > acpi-y += device_pm.o
    > acpi-$(CONFIG_ACPI_SLEEP) += proc.o
    >
    > diff --git a/drivers/acpi/sleep_arm.c b/drivers/acpi/sleep_arm.c
    > new file mode 100644
    > index 0000000..54578ef
    > --- /dev/null
    > +++ b/drivers/acpi/sleep_arm.c
    > @@ -0,0 +1,28 @@
    > +/*
    > + * ARM64 Specific Sleep Functionality
    > + *
    > + * Copyright (C) 2013-2014, Linaro Ltd.
    > + * Author: Graeme Gregory <graeme.gregory@linaro.org>
    > + *
    > + * This program is free software; you can redistribute it and/or modify
    > + * it under the terms of the GNU General Public License version 2 as
    > + * published by the Free Software Foundation.
    > + */
    > +
    > +#include <linux/acpi.h>
    > +
    > +/*
    > + * Currently the ACPI 5.1 standard does not define S states in a
    > + * manner which is usable for ARM64. These two stubs are sufficient
    > + * that system initialises and device PM works.
    > + */
    > +u32 acpi_target_system_state(void)
    > +{
    > + return ACPI_STATE_S0;
    > +}
    > +EXPORT_SYMBOL_GPL(acpi_target_system_state);
    > +
    > +int __init acpi_sleep_init(void)
    > +{
    > + return -ENOSYS;
    > +}
    >

    Why does this need to be in drivers/acpi/ ?

    --
    I speak only for myself.
    Rafael J. Wysocki, Intel Open Source Technology Center.


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