netdev - Re: [RFC PATCH v2 0/3] Create common DPLL/clock configuration API

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Date:   Fri, 30 Sep 2022 10:33:57 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     Vadim Fedorenko <vfedorenko@...ek.ru>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Vadim Fedorenko <vadfed@...com>, Aya Levin <ayal@...dia.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org
Subject: Re: [RFC PATCH v2 0/3] Create common DPLL/clock configuration API

Fri, Sep 30, 2022 at 02:44:25AM CEST, vfedorenko@...ek.ru wrote:
>On 29.09.2022 12:40, Jiri Pirko wrote:
>> Sun, Jun 26, 2022 at 09:24:41PM CEST, vfedorenko@...ek.ru wrote:
>> > From: Vadim Fedorenko <vadfed@...com>
>> > 
>> > Implement common API for clock/DPLL configuration and status reporting.
>> > The API utilises netlink interface as transport for commands and event
>> > notifications. This API aim to extend current pin configuration and
>> > make it flexible and easy to cover special configurations.
>> 
>> Do you have the userspace part somewhere?
>> It is very nice to add example outputs of user cmdline of such tool to
>> the patch description/cover letter.
>
>Sorry, but we don't have any user-space part for now. It's still WIP and
>there are too many changes in the protocol to implement anything useful on

What protocol?


>top of it. Once we will get to a kind of "stable" proto, I will implement a
>library to use it.
>
>> 
>> Also, did you consider usage of sysfs? Why it isn't a better fit than
>> netlink?
>
>We already have sysfs implemented in the ptp_ocp driver. But it looks like
>more hardware is going to be available soon with almost the same functions,
>so it would be great to have common protocol to configure such devices.

Sure, but more hw does not mean you can't use sysfs. Take netdev as an
example. The sysfs exposed for it is implemented net/core/net-sysfs.c
and is exposed for all netdev instances, no matter what the
driver/hardware is.


>> 
>> Regarding the naming, is "dpll" the correct one. Forgive me for being a
>> syncE greenie, but isn't dpll just one algo to achieve syntonous
>> clocks? Perhaps "dco" as for "Digitally Controlled Oscillator" would be
>> somewhat better fit?
>> 
>
>We will discuss the naming too, thanks!
>
>> 
>> > 
>> > v1 -> v2:
>> > * implement returning supported input/output types
>> > * ptp_ocp: follow suggestions from Jonathan
>> > * add linux-clk mailing list
>> > v0 -> v1:
>> > * fix code style and errors
>> > * add linux-arm mailing list
>> > 
>> > 
>> > Vadim Fedorenko (3):
>> >   dpll: Add DPLL framework base functions
>> >   dpll: add netlink events
>> >   ptp_ocp: implement DPLL ops
>> > 
>> > MAINTAINERS                 |   8 +
>> > drivers/Kconfig             |   2 +
>> > drivers/Makefile            |   1 +
>> > drivers/dpll/Kconfig        |   7 +
>> > drivers/dpll/Makefile       |   7 +
>> > drivers/dpll/dpll_core.c    | 161 ++++++++++
>> > drivers/dpll/dpll_core.h    |  40 +++
>> > drivers/dpll/dpll_netlink.c | 595 ++++++++++++++++++++++++++++++++++++
>> > drivers/dpll/dpll_netlink.h |  14 +
>> > drivers/ptp/Kconfig         |   1 +
>> > drivers/ptp/ptp_ocp.c       | 169 +++++++---
>> > include/linux/dpll.h        |  29 ++
>> > include/uapi/linux/dpll.h   |  81 +++++
>> > 13 files changed, 1079 insertions(+), 36 deletions(-)
>> > create mode 100644 drivers/dpll/Kconfig
>> > create mode 100644 drivers/dpll/Makefile
>> > create mode 100644 drivers/dpll/dpll_core.c
>> > create mode 100644 drivers/dpll/dpll_core.h
>> > create mode 100644 drivers/dpll/dpll_netlink.c
>> > create mode 100644 drivers/dpll/dpll_netlink.h
>> > create mode 100644 include/linux/dpll.h
>> > create mode 100644 include/uapi/linux/dpll.h
>> > 
>> > -- 
>> > 2.27.0
>> > 
>