linux-kernel - Re: [PATCH v4 0/9] phy: Add configuration interface for MIPI D-PHY devices

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Message-ID: <20190109122824.vcxpcmiunball5rq@valkosipuli.retiisi.org.uk>
Date:   Wed, 9 Jan 2019 14:28:24 +0200
From:   Sakari Ailus <sakari.ailus@....fi>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     Kishon Vijay Abraham I <kishon@...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 v4 0/9] phy: Add configuration interface for MIPI D-PHY
 devices

On Wed, Jan 09, 2019 at 10:33:17AM +0100, 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.
> 
> Let me know what you think,
> Maxime
> 
> Changes from v3
>   - Rebased on 5.0-rc1
>   - Added the fixes suggested by Sakari

Thanks!

For patches 1--3:

Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>

-- 
Sakari Ailus