linux-kernel - Re: [PATCH 1/1] net: fec: ptp: avoid register access when ipg clock is disabled

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Date:   Thu, 25 Feb 2021 15:05:32 +0100
From:   Heiko Thiery <heiko.thiery@...il.com>
To:     Richard Cochran <richardcochran@...il.com>
Cc:     Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
        Fugang Duan <fugang.duan@....com>
Subject: Re: [PATCH 1/1] net: fec: ptp: avoid register access when ipg clock
 is disabled

Hi Richard,

Am Do., 25. Feb. 2021 um 14:49 Uhr schrieb Heiko Thiery
<heiko.thiery@...il.com>:
>
> Hi Richard,
>
> Am Di., 23. Feb. 2021 um 17:11 Uhr schrieb Richard Cochran
> <richardcochran@...il.com>:
> >
> > On Tue, Feb 23, 2021 at 04:04:16PM +0100, Heiko Thiery wrote:
> > > It is not only the PHC clock that stops. Rather, it is the entire
> > > ethernet building block in the SOC that is disabled, including the
> > > PHC.
> >
> > Sure, but why does the driver do that?
>
> That is a good question. I tried to understand the clock
> infrastructure of the imx8 but it looks quite complicated. I cannot
> find the point where all the stuff is disabled.

But the explanation why it is currently disabled that way can be found
in the commit 91c0d987a9788dcc5fe26baafd73bf9242b68900.

-- 
Heiko