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From: Dipen Patel <dipenp@nvidia.com>
To: Linus Walleij <linus.walleij@linaro.org>,
	"D, Lakshmi Sowjanya" <lakshmi.sowjanya.d@intel.com>
Cc: "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Mark Gross <mgross@linux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	"Saha, Tamal" <tamal.saha@intel.com>, <bala.senthil@intel.com>
Subject: Re: [RFC PATCH v1 00/20] Review Request: Add support for Intel PMC
Date: Mon, 11 Oct 2021 14:14:12 -0700	[thread overview]
Message-ID: <f5f97c30-2b4e-2490-2197-1d5a108992d1@nvidia.com> (raw)
In-Reply-To: <CACRpkdZEp0FZOefBPP_sR4g6rKzeKQhpdL-XHYO+CRt5MfTrYg@mail.gmail.com>

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@intel.com> wrote:
>
>> From: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.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

      reply	other threads:[~2021-10-11 21:14 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24 16:47 lakshmi.sowjanya.d
2021-08-24 16:47 ` [RFC PATCH v1 01/20] gpio: Add basic GPIO driver for Intel PMC Timed I/O device lakshmi.sowjanya.d
2021-08-24 16:47 ` [RFC PATCH v1 02/20] gpio: Add GPIO polling interface to GPIO lib lakshmi.sowjanya.d
2021-09-22 10:03   ` Bartosz Golaszewski
2021-10-07  2:14     ` Kent Gibson
2021-08-24 16:47 ` [RFC PATCH v1 03/20] arch: x86: Add ART support function to tsc code lakshmi.sowjanya.d
2021-08-24 16:47 ` [RFC PATCH v1 04/20] gpio: Add input code to Intel PMC Timed I/O Driver lakshmi.sowjanya.d
2021-08-24 16:47 ` [RFC PATCH v1 05/20] tools: gpio: Add additional polling support to gpio-event-mon lakshmi.sowjanya.d
2021-08-24 16:47 ` [RFC PATCH v1 06/20] gpio: Add set_input and polling interface to GPIO lib code lakshmi.sowjanya.d
2021-08-24 16:47 ` [RFC PATCH v1 07/20] gpio: Add output event generation method to GPIOLIB and PMC Driver lakshmi.sowjanya.d
2021-09-16 21:42   ` Linus Walleij
2021-09-17  7:27     ` Uwe Kleine-König
2021-09-19 19:38       ` Linus Walleij
2021-09-19 21:21         ` Clemens Gruber
2021-09-20  7:14           ` Uwe Kleine-König
2021-08-24 16:47 ` [RFC PATCH v1 08/20] kernel: time: Add system time to system counter translation lakshmi.sowjanya.d
2021-09-16 21:48   ` Linus Walleij
2021-08-24 16:47 ` [RFC PATCH v1 09/20] arch: x86: Add TSC to ART translation lakshmi.sowjanya.d
2021-08-24 16:47 ` [RFC PATCH v1 10/20] tools: gpio: Add GPIO output generation user application lakshmi.sowjanya.d
2021-09-16 21:52   ` Linus Walleij
2021-08-24 16:47 ` [RFC PATCH v1 11/20] gpio: Add event count interface to gpiolib lakshmi.sowjanya.d
2021-09-22  9:53   ` Bartosz Golaszewski
2021-08-24 16:47 ` [RFC PATCH v1 12/20] gpio: Add event count to Intel(R) PMC Timed I/O driver lakshmi.sowjanya.d
2021-08-24 16:47 ` [RFC PATCH v1 13/20] tools: gpio: Add event count capability to event monitor application lakshmi.sowjanya.d
2021-09-16 21:57   ` Linus Walleij
2021-08-24 16:47 ` [RFC PATCH v1 14/20] arch/x86: Add ART nanosecond to ART conversion lakshmi.sowjanya.d
2021-08-24 16:47 ` [RFC PATCH v1 15/20] pwm: Add capability for PWM Driver managed state lakshmi.sowjanya.d
2021-09-16 22:00   ` Linus Walleij
2021-08-24 16:47 ` [RFC PATCH v1 16/20] gpio: Add PWM capabilities to Intel(R) PMC TIO driver lakshmi.sowjanya.d
2021-08-24 16:47 ` [RFC PATCH v1 17/20] pwm: Add second alignment to the core PWM interface lakshmi.sowjanya.d
2021-08-24 16:47 ` [RFC PATCH v1 18/20] gpio: Add PWM alignment support to the Intel(R) PMC Timed I/O driver lakshmi.sowjanya.d
2021-08-24 16:48 ` [RFC PATCH v1 19/20] gpio: Add GPIO monitor line to Intel(R) Timed I/O Driver lakshmi.sowjanya.d
2021-08-24 16:48 ` [RFC PATCH v1 20/20] tools: gpio: Add PWM monitor application lakshmi.sowjanya.d
2021-09-16 21:21 ` [RFC PATCH v1 00/20] Review Request: Add support for Intel PMC Linus Walleij
2021-10-11 21:14   ` Dipen Patel [this message]

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