linux-kernel - Re: [PATCH RFC 1/2] ACPI/PPTT: Add acpi_pptt_get_package

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Date:   Wed, 29 Jan 2020 11:03:27 +0000
From:   John Garry <john.garry@...wei.com>
To:     Sudeep Holla <sudeep.holla@....com>
CC:     <rjw@...ysocki.net>, <lenb@...nel.org>, <jeremy.linton@....com>,
        <arnd@...db.de>, <olof@...om.net>, <linux-kernel@...r.kernel.org>,
        <linux-acpi@...r.kernel.org>, <guohanjun@...wei.com>,
        <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        wanghuiqiang <wanghuiqiang@...wei.com>
Subject: Re: [PATCH RFC 1/2] ACPI/PPTT: Add acpi_pptt_get_package_info() API

On 28/01/2020 14:54, Sudeep Holla wrote:
>>>> https://lore.kernel.org/linux-arm-kernel/1579876505-113251-6-git-send-email-john.garry@huawei.com/
>>>>
>>> Ah, there's already quite a lot of dependency built for this feature:(
>> Not really. It's only an RFC ATM, and my requirement is a sysfs file to read
>> the SoC id(s) (under ACPI FW). So I would still expect to be able to support
>> this from the SMCCC extension method.
>>

Hi Sudeep,

> As mentioned above, yes the driver would remain almost same for SMCCC
> SOC_ID support too. The main point was: do we need to add support to
> PPTT Type 2 entry when we know there is proposal to deprecate it. I
> would at-least wait to see progress on that until I would add this to
> the kernel.

Not having support in the kernel for a feature which may be officially 
deprecated, i.e public knowledge, in future (maybe 1 year) seems harsh. 
Especially when there is no final released alternative.

So do you know if other OSes use it?

Thanks
John