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Subject: Re: [RFC v2 02/11] drivers: Add hardware timestamp engine (HTE)
To:     Dipen Patel <dipenp@nvidia.com>, thierry.reding@gmail.com,
        jonathanh@nvidia.com, linux-kernel@vger.kernel.org,
        linux-tegra@vger.kernel.org, linux-gpio@vger.kernel.org,
        linus.walleij@linaro.org, bgolaszewski@baylibre.com,
        warthog618@gmail.com, devicetree@vger.kernel.org,
        linux-doc@vger.kernel.org, robh+dt@kernel.org
References: <20210930232617.6396-1-dipenp@nvidia.com>
 <20210930232617.6396-3-dipenp@nvidia.com>
From:   Randy Dunlap <rdunlap@infradead.org>
Message-ID: <010426c7-74ed-33fb-0c06-c42408cffc0e@infradead.org>
Date:   Fri, 1 Oct 2021 16:53:31 -0700
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On 9/30/21 4:26 PM, Dipen Patel wrote:
> diff --git a/drivers/hte/Kconfig b/drivers/hte/Kconfig
> new file mode 100644
> index 000000000000..6fdf243d281b
> --- /dev/null
> +++ b/drivers/hte/Kconfig
> @@ -0,0 +1,22 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +menuconfig HTE
> +	bool "Hardware Timestamping Engine (HTE) Support"
> +	help
> +	  Hardware Timestamping Engine (HTE) Support.
> +
> +	  Some devices provide hardware timestamping engine which can timestamp

	               provide a hardware

> +	  certain device lines/signals in realtime. This way to provide

	                                            This provides a

> +	  hardware assisted timestamp to generic signals like GPIOs, IRQs lines

	  hardware-assisted                              like GPIOs or IRQ lines.


> +	  comes with benefit for the applications like autonomous machines

	  It comes with a benefit for applications like

> +	  needing accurate timestamping event with less jitter.
> +
> +	  This framework provides a generic interface to such HTE devices
> +	  within the Linux kernel. It provides an API to register and
> +	  unregister a HTE provider chip, configurable sw buffer to

	                                               software

> +	  store the timestamps, push the timestamp from the HTE providers and
> +	  retrieve timestamps for the consumers. It also provides means for the
> +	  consumers to request signals it wishes to hardware timestamp and
> +	  release them if not required.
> +
> +	  If unsure, say no.


HTH.
-- 
~Randy