Linux CAN drivers development
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From: Pavel Pisa <pisa@cmp.felk.cvut.cz>
To: "Marc Kleine-Budde" <mkl@pengutronix.de>
Cc: Matej Vasilevski <matej.vasilevski@seznam.cz>,
	Ondrej Ille <ondrej.ille@gmail.com>,
	Wolfgang Grandegger <wg@grandegger.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Rob Herring <robh+dt@kernel.org>,
	linux-can@vger.kernel.org
Subject: Re: [PATCH v5 2/4] can: ctucanfd: add HW timestamps to RX and error CAN frames
Date: Mon, 24 Oct 2022 13:42:29 +0200	[thread overview]
Message-ID: <202210241342.29170.pisa@cmp.felk.cvut.cz> (raw)
In-Reply-To: <20221017121122.kt6adqz4dtqc2sy5@pengutronix.de>

Hello Marc,

On Monday 17 of October 2022 14:11:22 Marc Kleine-Budde wrote:
> On 16.10.2022 23:54:48, Pavel Pisa wrote:
> [...]
>
> > I hope/expect that it is not problem to call clk_prepare_enable twice
> > on same reference when the clocks are the same. As I read the code the
> > state is counted. If it is a problem then some if has to be put there
> > when the core and timestamp clock are the same.
>
> The clock prepare and enable are counting. If you call then twice, you
> have to call disable and unprepare twice, too, to shut it down. This is
> widely used in the kernel, e.g. if the same clock is passed to several
> IP cores.

Thanks for confirmation of my understanding.

As to move formward, is the referenced Matej Vasilevski's
series acceptable by you or do you see some problems still?

I have ACKed this patch, I consider it as functional
for mainline and good base for our further testing
and development.

Should I ACK others as well or Reviewed-by: Rob Herring
is enough for deice tree?

The last one is exactly reaction to your comment and the
documentation is evident.

Best wishes,

                Pavel
-- 
                Pavel Pisa
    phone:      +420 603531357
    e-mail:     pisa@cmp.felk.cvut.cz
    Department of Control Engineering FEE CVUT
    Karlovo namesti 13, 121 35, Prague 2
    university: http://control.fel.cvut.cz/
    personal:   http://cmp.felk.cvut.cz/~pisa
    projects:   https://www.openhub.net/accounts/ppisa
    CAN related:http://canbus.pages.fel.cvut.cz/
    RISC-V education: https://comparch.edu.cvut.cz/
    Open Technologies Research Education and Exchange Services
    https://gitlab.fel.cvut.cz/otrees/org/-/wikis/home


  reply	other threads:[~2022-10-24 21:33 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-12  6:25 [PATCH v5 0/4] can: ctucanfd: hardware rx timestamps reporting Matej Vasilevski
2022-10-12  6:25 ` [PATCH v5 1/4] dt-bindings: can: ctucanfd: add another clock for HW timestamping Matej Vasilevski
2022-10-12 16:21   ` Rob Herring
2022-10-12  6:25 ` [PATCH v5 2/4] can: ctucanfd: add HW timestamps to RX and error CAN frames Matej Vasilevski
2022-10-16 21:54   ` Pavel Pisa
2022-10-17 12:11     ` Marc Kleine-Budde
2022-10-24 11:42       ` Pavel Pisa [this message]
2022-10-24 20:02   ` Marc Kleine-Budde
2022-10-25 22:22     ` Matej Vasilevski
2022-10-26  7:15       ` Marc Kleine-Budde
2022-10-25  8:18   ` Marc Kleine-Budde
2022-10-25  9:25   ` Marc Kleine-Budde
2022-10-12  6:25 ` [PATCH v5 3/4] doc: ctucanfd: RX frames timestamping for platform devices Matej Vasilevski
2022-10-12  6:25 ` [PATCH v5 4/4] can: ctucanfd: remove __maybe_unused from suspend/resume callbacks Matej Vasilevski

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