linux-kernel - Re: [PATCH RFC 2/2] soc: Add a basic ACPI generic driver

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Date:   Tue, 28 Jan 2020 19:28:11 +0000
From:   John Garry <john.garry@...wei.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
CC:     Olof Johansson <olof@...om.net>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Jeremy Linton <jeremy.linton@....com>,
        "Arnd Bergmann" <arnd@...db.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Hanjun Guo <guohanjun@...wei.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: Re: [PATCH RFC 2/2] soc: Add a basic ACPI generic driver


>>>>
>>>> Signed-off-by: John Garry <john.garry@...wei.com>
>>>> ---
>>>>    drivers/soc/Makefile       |   1 +
>>>>    drivers/soc/acpi_generic.c | 102 +++++++++++++++++++++++++++++++++++++
>>>>    2 files changed, 103 insertions(+)
>>>>    create mode 100644 drivers/soc/acpi_generic.c
>>>>
>>>> diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
>>>> index 8b49d782a1ab..2a59a30a22cd 100644
>>>> --- a/drivers/soc/Makefile
>>>> +++ b/drivers/soc/Makefile
>>>> @@ -3,6 +3,7 @@
>>>>    # Makefile for the Linux Kernel SOC specific device drivers.
>>>>    #
>>>>
>>>> +obj-$(CONFIG_ACPI_PPTT)                += acpi_generic.o
>>>>    obj-$(CONFIG_ARCH_ACTIONS)     += actions/
>>>>    obj-$(CONFIG_SOC_ASPEED)       += aspeed/
>>>>    obj-$(CONFIG_ARCH_AT91)                += atmel/
>>>
>>> Based on everything I've seen so far, this should go under drivers/acpi instead.
>>
>> soc drivers seem to live in drivers/soc (non-arm32, anyway), so I
>> decided on this location. But drivers/acpi would also seem reasonable now.
> 

Hi Rafael,

> Any reasons for not putting it into drivers/acpi/pptt.c specifically?
> .

I don't think so.

One thing is that the code does a one-time scan of the PPTT to find all 
processor package nodes with ID structures to register the soc devices - 
so we would need some new call from from acpi_init() for that.

Thanks,
John