linux-kernel - Re: [V2 1/4] drivers pps: add PPS generators support

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Message-ID: <b4854dab-b5e5-4e72-97ff-4d7cdb5723c1@infradead.org>
Date: Thu, 31 Oct 2024 10:08:40 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Rodolfo Giometti <giometti@...eenne.com>, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>, Greg KH <greg@...ah.com>,
 corbet@....net, Hall Christopher S <christopher.s.hall@...el.com>,
 Mohan Subramanian <subramanian.mohan@...el.com>, tglx@...utronix.de,
 Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Dong Eddie <eddie.dong@...el.com>, N Pandith <pandith.n@...el.com>,
 T R Thejesh Reddy <thejesh.reddy.t.r@...el.com>,
 Zage David <david.zage@...el.com>,
 Chinnadurai Srinivasan <srinivasan.chinnadurai@...el.com>
Subject: Re: [V2 1/4] drivers pps: add PPS generators support



On 10/31/24 9:35 AM, Rodolfo Giometti wrote:
> Sometimes one needs to be able not only to catch PPS signals but to
> produce them also. For example, running a distributed simulation,
> which requires computers' clock to be synchronized very tightly.
> 
> This patch adds PPS generators class in order to have a well-defined
> interface for these devices.
> 
> Signed-off-by: Rodolfo Giometti <giometti@...eenne.com>
> ---
>  .../userspace-api/ioctl/ioctl-number.rst      |   1 +
>  MAINTAINERS                                   |   1 +
>  drivers/pps/Makefile                          |   3 +-
>  drivers/pps/generators/Kconfig                |  13 +-
>  drivers/pps/generators/Makefile               |   3 +
>  drivers/pps/generators/pps_gen.c              | 344 ++++++++++++++++++
>  drivers/pps/generators/sysfs.c                |  75 ++++
>  include/linux/pps_gen_kernel.h                |  78 ++++
>  include/uapi/linux/pps_gen.h                  |  37 ++
>  9 files changed, 553 insertions(+), 2 deletions(-)
>  create mode 100644 drivers/pps/generators/pps_gen.c
>  create mode 100644 drivers/pps/generators/sysfs.c
>  create mode 100644 include/linux/pps_gen_kernel.h
>  create mode 100644 include/uapi/linux/pps_gen.h
> 

> diff --git a/drivers/pps/generators/Kconfig b/drivers/pps/generators/Kconfig
> index d615e640fcad..5edbfdb8bd92 100644
> --- a/drivers/pps/generators/Kconfig
> +++ b/drivers/pps/generators/Kconfig
> @@ -3,7 +3,16 @@
>  # PPS generators configuration
>  #
>  
> -comment "PPS generators support"
> +menuconfig PPS_GENERATOR
> +	tristate "PPS generators support"
> +	help
> +	  PPS generators are special hardware which are able to produce PPS
> +	  (Pulse Per Second) signals.
> +
> +	  To compile this driver as a module, choose M here: the module
> +	  will be called pps_gen_core.ko.

Drop the ".ko" suffix as you did for the dummy module and most of the kernel does.

> +
> +if PPS_GENERATOR
>  
>  config PPS_GENERATOR_PARPORT
>  	tristate "Parallel port PPS signal generator"
> @@ -12,3 +21,5 @@ config PPS_GENERATOR_PARPORT
>  	  If you say yes here you get support for a PPS signal generator which
>  	  utilizes STROBE pin of a parallel port to send PPS signals. It uses
>  	  parport abstraction layer and hrtimers to precisely control the signal.
> +
> +endif # PPS_GENERATOR


-- 
~Randy