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

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Message-ID: <20181219154040.k424xkzz3xap6462@flea>
Date:   Wed, 19 Dec 2018 16:40:40 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     sakari.ailus@....fi
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

On Mon, Dec 17, 2018 at 10:20:39PM +0200, sakari.ailus@....fi wrote:
> 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.

Ah, right, I get it now, thanks!
Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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