linux-kernel - Re: [RFC 0/2] drm/dsi: DSI for devices with different control bus

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Message-ID: <55D40F2A.6000208@codeaurora.org>
Date:	Wed, 19 Aug 2015 10:37:54 +0530
From:	Archit Taneja <architt@...eaurora.org>
To:	dri-devel@...ts.freedesktop.org
CC:	linux-arm-msm@...r.kernel.org, treding@...dia.com,
	inki.dae@...sung.com, a.hajda@...sung.com,
	linux-kernel@...r.kernel.org, airlied@...ux.ie, daniel@...ll.ch,
	jani.nikula@...ux.intel.com
Subject: Re: [RFC 0/2] drm/dsi: DSI for devices with different control bus

Hi,

On 06/30/2015 10:54 AM, Archit Taneja wrote:
> We are currently restricted when it comes to supporting DSI on devices
> that have a non-DSI control bus. For example, DSI encoder chips are
> available in the market that are configured via i2c. Configuring their
> registers via DSI bus is either optional or not available at all.
>
> These devices still need to pass DSI parameters (data lanes, mode flags
> etc) to the DSI host they are connected to. We don't have a way to do
> that at the moment.
>
> The method presented in these patches is to provide an API to create a
> 'dummy' mipi_dsi_device. This device is populated with the desired DSI
> params, which are passed on to the host via mipi_dsi_attach().
>
> This method will require the device driver to get a phandle to the DSI
> host since there is no parent-child relation between the two.
>
> Is there a better way to do this? Please let me know!

Any comments on this?

Archit

>
> Archit Taneja (2):
>    drm/dsi: Create dummy DSI devices
>    drm/dsi: Get DSI host by DT device node
>
>   drivers/gpu/drm/drm_mipi_dsi.c | 108 ++++++++++++++++++++++++++++++++++++++++-
>   include/drm/drm_mipi_dsi.h     |   4 ++
>   2 files changed, 110 insertions(+), 2 deletions(-)
>

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