linux-kernel - Re: [PATCH v3 03/10] phy: Add MIPI D-PHY configuration options

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Message-ID: <20181217202039.zhsxozdw7dlc3xdj@valkosipuli.retiisi.org.uk>
Date:   Mon, 17 Dec 2018 22:20:39 +0200
From:   sakari.ailus@....fi
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-media@...r.kernel.org,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Chen-Yu Tsai <wens@...e.org>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        Krzysztof Witos <kwitos@...ence.com>,
        Rafal Ciepiela <rafalc@...ence.com>
Subject: Re: [PATCH v3 03/10] phy: Add MIPI D-PHY configuration options

Hi Maxime,

On Mon, Dec 17, 2018 at 04:49:21PM +0100, Maxime Ripard wrote:
> Hi Sakari,
> 
> Thanks for your feedback.
> 
> On Thu, Dec 13, 2018 at 10:49:28PM +0200, sakari.ailus@....fi wrote:
> > > +	/**
> > > +	 * @lanes:
> > > +	 *
> > > +	 * Number of active data lanes used for the transmissions.
> > 
> > Could you add that these are the first "lanes" number of lanes from what
> > are available?
> 
> I'm not quite sure I understood this part though, what did you mean?

A number of lanes are routed between the two devices on hardware, and this
field is specifying how many of them are in use. In order for the bus to
function, both ends need to be in agreement on which of these lanes are
actually being used. The current practice I've seen without exceptions is
that these are the first n lanes.

-- 
Regards,

Sakari Ailus