linux-kernel - Re: [PATCH 1/2] mux: add mux_control_get

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Date:   Fri, 8 Sep 2017 17:54:03 +0200
From:   Peter Rosin <peda@...ntia.se>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Stephen Boyd <stephen.boyd@...aro.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Mathias Nyman <mathias.nyman@...el.com>,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Sathyanarayanan Kuppuswamy Natarajan <sathyaosid@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 1/2] mux: add mux_control_get_optional() API

On 2017-09-08 17:45, Peter Rosin wrote:
> From: Stephen Boyd <stephen.boyd@...aro.org>
> 
> Sometimes drivers only use muxes under certain scenarios. For
> example, the chipidea usb controller may be connected to a usb
> switch on some platforms, and connected directly to a usb port on
> others. The driver won't know one way or the other though, so add
> a mux_control_get_optional() API that allows the driver to
> differentiate errors getting the mux from there not being a mux
> for the driver to use at all.
> ---
>  Documentation/driver-model/devres.txt |   1 +
>  drivers/mux/core.c                    | 104 +++++++++++++++++++++++++++-------
>  include/linux/mux/consumer.h          |   4 ++
>  3 files changed, 89 insertions(+), 20 deletions(-)
> 
> I haven't tested this patch, and hence I have not signed it and I also
> removed the sign-off from Stephen...

Huh, I definitely intended to mention that this patch is based on [1]
from Stephen, but that I've made changes according to the comments in
that thread (and more). And those changes are what made me remove the
sign-off from Stephen...

Sorry for the noise,
Peter

[1] https://lkml.org/lkml/2017/7/14/655