linux-kernel - Re: [PATCH v2 2/2] media:st-mipid02: MIPID02 CSI-2 to PARALLEL bridge driver

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Message-ID: <20190326113437.bpebmfs7mipsg24y@paasikivi.fi.intel.com>
Date:   Tue, 26 Mar 2019 13:34:37 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Mickael GUENE <mickael.guene@...com>
Cc:     "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        Hugues FRUCHET <hugues.fruchet@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Matt Ranostay <matt.ranostay@...sulko.com>,
        Akinobu Mita <akinobu.mita@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Ben Kao <ben.kao@...el.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Todor Tomov <todor.tomov@...aro.org>,
        Rui Miguel Silva <rui.silva@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Ricardo Ribalda Delgado <ricardo@...alda.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Tianshu Qiu <tian.shu.qiu@...el.com>,
        Bingbu Cao <bingbu.cao@...el.com>
Subject: Re: [PATCH v2 2/2] media:st-mipid02: MIPID02 CSI-2 to PARALLEL
 bridge driver

Hi Mickael,

On Mon, Mar 25, 2019 at 12:22:17PM +0000, Mickael GUENE wrote:
...
> >> +	/* register it for later use */
> >> +	bridge->rx = ep;
> >> +	bridge->rx.link_frequencies = ep.nr_of_link_frequencies == 1 ?
> >> +		&bridge->link_frequency : NULL;
> > 
> > I think you need to simply ignore the link frequencies here. The
> > transmitting device can tell the frequency based on its configuration
> > (based on the link frequencies). You seem to have implemented that already.
> > 
>  Idea of this was to allow some support for sensor that doesn't implement
> V4L2_CID_PIXEL_RATE. Do you think it's useless ?

Sensor drivers need to be amended with support for that control.

-- 
Sakari Ailus
sakari.ailus@...ux.intel.com