linux-kernel - Re: [PATCH 04/12] i2c: mux: populate the new *

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Date:   Mon, 15 Apr 2019 14:04:41 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Peter Rosin <peda@...ntia.se>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Stefan Lengfeld <contact@...fanchrist.eu>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH 04/12] i2c: mux: populate the new *_atomic callbacks


> I guess the question is if it is allowed to have .master_xfer_atomic
> but not .master_xfer (and similarly for .smbus_xfer{,_atomic})? Maybe
> that decision should be made explicit? And perhaps enforced?

xfer_atomic callbacks are optional. One xfer callback is mandatory. I
did a check for falling back to master_xfer_atomic if there is no
suitable smbus_xfer_atomic. I will think about the vice-versa case you
mentioned. Yet, this is indeed a super corner case, so I prefer to fix
this incrementally.

> I don't care deeply about the above though, so feel free to do
> something about it, or
> 
> Reviewed-by: Peter Rosin <peda@...ntia.se>

Thanks for the review!


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