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From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Tue, 24 Jul 2018 17:46:09 +0200
Message-ID: <CAMuHMdXJ_FGXXwNx8h0ZfskJGRWES1xLuTQpD59Vw1Smp6FTRg@mail.gmail.com>
Subject: Re: [PATCH v6 00/10] Add the I3C subsystem
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Boris Brezillon <boris.brezillon@bootlin.com>,
        Peter Rosin <peda@axentia.se>,
        Wolfram Sang <wsa@the-dreams.de>,
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Hi Arnd,

On Tue, Jul 24, 2018 at 5:40 PM Arnd Bergmann <arnd@arndb.de> wrote:
> On Tue, Jul 24, 2018 at 5:15 PM, Geert Uytterhoeven
> <geert@linux-m68k.org> wrote:
> > On Tue, Jul 24, 2018 at 5:05 PM Arnd Bergmann <arnd@arndb.de> wrote:
>
> >> That's not the case I was describing here, I was thinking of what
> >> Wolfram described with the Renesas SoC that has two i2c masters
> >> multiplexed through the pinmux layer. I would assume that we
> >> can still do the same thing in i3c by shutting down the current
> >> master without a handover, and reprobing everything from scratch.
> >
> > The major disadvantage of reprobing is that it may cause visual disturbances
> > when i2c slaves are involved with e.g. the display pipeline (think HDMI encoders
> > etc.).
>
> Do you mean we should reuse the device pointer and association with
> the driver even when we switch out the i3c master using the pinmux?
>
> Or do you mean we need to be prepared for driving a single
> slave through multiple masters over the lifetime of that device,
> but using the i3c master handover protocol?
> In the second case, how do we decide which master to use
> for accessing a device for a given request?

I'll have to defer to Wolfram. He's the i2c and muxing expert.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds