linux-kernel - Re: [RFC PATCH v1 00/20] Review Request: Add support for Intel PMC

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Message-ID: <f5f97c30-2b4e-2490-2197-1d5a108992d1@nvidia.com>
Date:   Mon, 11 Oct 2021 14:14:12 -0700
From:   Dipen Patel <dipenp@...dia.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        "D, Lakshmi Sowjanya" <lakshmi.sowjanya.d@...el.com>
CC:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Mark Gross <mgross@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "Saha, Tamal" <tamal.saha@...el.com>, <bala.senthil@...el.com>
Subject: Re: [RFC PATCH v1 00/20] Review Request: Add support for Intel PMC

Thanks Linus for referring. I will take a look.

@Sowjanya: I have recently sent out the RFC v2 of the HTE (https://patchwork.ozlabs.org/project/linux-tegra/list/?series=264896).

Please have a look and see if you can add TIO as one of the provider. That patch has necessary GPIOLIB and GPIO-CDEV changes

which can help userspace and in kernel driver retrieve GPIO realtime timestamps.


Best,

Dipen Patel

On 9/16/21 2:21 PM, Linus Walleij wrote:
> Hi Sowjanya,
>
> thanks for your patches!
>
> On Tue, Aug 24, 2021 at 6:48 PM <lakshmi.sowjanya.d@...el.com> wrote:
>
>> From: Lakshmi Sowjanya D <lakshmi.sowjanya.d@...el.com>
>>
>> Starting with Intel(R) Tiger Lake and Elkhart Lake platforms the PMC
>> hardware adds the Timed I/O hardware interface.
>>
>> The Timed I/O hardware implements some functionality similar to GPIO
>> with added timing logic that is driven by the Always Running Timer
>> (ART).
>>
>> The Timed I/O Hardware implement 3 basic functions:
>>   * Input Timestamping
>>   * Single Shot Timed Output
>>   * Periodic Timed Output
>>
>>  Please help to review the changes.
> This looks very similar to the usecase proposed for the HTE
> Hardware Timestamping Engine, proposed by Dipen Patel
> for the nVidia 194 and which is currently in RFC:
> https://lore.kernel.org/linux-gpio/20210625235532.19575-1-dipenp@nvidia.com/
>
> Please review this new subsystem and see if you can just
> make a slot-in driver using Dipen's patches instead.
>
> Dipen: please have a look at Sowjanya's patches to see
> if this hardware is similar to yours.
>
> Sometimes several vendors come up with similar hardware
> around the same time, because of industry trends, so I would
> not be surprised if these two hardwares address the very
> same usecase.
>
> Yours,
> Linus Walleij