linux-kernel - Re: [RFC v2 02/11] drivers: Add hardware timestamp engine (HTE)

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Date:   Fri, 1 Oct 2021 16:53:31 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Dipen Patel <dipenp@...dia.com>, thierry.reding@...il.com,
        jonathanh@...dia.com, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-gpio@...r.kernel.org,
        linus.walleij@...aro.org, bgolaszewski@...libre.com,
        warthog618@...il.com, devicetree@...r.kernel.org,
        linux-doc@...r.kernel.org, robh+dt@...nel.org
Subject: Re: [RFC v2 02/11] drivers: Add hardware timestamp engine (HTE)

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