linux-kernel - Re: [PATCH v2 0/9] phy: Add configuration interface for MIPI D-PHY devices

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Date:   Fri, 7 Dec 2018 10:09:35 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     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 v2 0/9] phy: Add configuration interface for MIPI D-PHY
 devices

On Fri, Dec 07, 2018 at 10:30:55AM +0530, Kishon Vijay Abraham I wrote:
> Maxime,
> 
> On 06/11/18 8:24 PM, Maxime Ripard wrote:
> > Hi,
> > 
> > Here is a set of patches to allow the phy framework consumers to test and
> > apply runtime configurations.
> > 
> > This is needed to support more phy classes that require tuning based on
> > parameters depending on the current use case of the device, in addition to
> > the power state management already provided by the current functions.
> > 
> > A first test bed for that API are the MIPI D-PHY devices. There's a number
> > of solutions that have been used so far to support these phy, most of the
> > time being an ad-hoc driver in the consumer.
> > 
> > That approach has a big shortcoming though, which is that this is quite
> > difficult to deal with consumers integrated with multiple variants of phy,
> > of multiple consumers integrated with the same phy.
> > 
> > The latter case can be found in the Cadence DSI bridge, and the CSI
> > transceiver and receivers. All of them are integrated with the same phy, or
> > can be integrated with different phy, depending on the implementation.
> > 
> > I've looked at all the MIPI DSI drivers I could find, and gathered all the
> > parameters I could find. The interface should be complete, and most of the
> > drivers can be converted in the future. The current set converts two of
> > them: the above mentionned Cadence DSI driver so that the v4l2 drivers can
> > use them, and the Allwinner MIPI-DSI driver.
> 
> Are you planning to send one more revision of this series after fixing the
> comments?

I'll send a new version today.

Thanks!
Maxime

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

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