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From: Hans Verkuil <hverkuil@xs4all.nl>
To: Samuel Bobrowicz <sam@elite-embedded.com>,
	linux-media@vger.kernel.org,
	Steve Longerbeam <slongerbeam@gmail.com>
Subject: Re: OV5640 with 12MHz xclk
Date: Mon, 16 Apr 2018 14:26:28 +0200	[thread overview]
Message-ID: <4d87c28b-4adb-86d6-986b-e1ffdceb3138@xs4all.nl> (raw)
In-Reply-To: <CAFwsNOEF0rK+SeHQ618Rnuj2ZWaGZG2WY4keWmavqG_agSi+dw@mail.gmail.com>

On 04/16/2018 03:39 AM, Samuel Bobrowicz wrote:
> Can anyone verify if the OV5640 driver works with input clocks other
> than the typical 24MHz? The driver suggests anything from 6MHz-24MHz
> is acceptable, but I am running into issues while bringing up a module
> that uses a 12MHz oscillator. I'd expect that different xclk's would
> necessitate different register settings for the various resolutions
> (PLL settings, PCLK width, etc.), however the driver does not seem to
> modify nearly enough based on the frequency of xclk.
> 
> Sam
> 

I'm pretty sure it has never been tested with 12 MHz. The i.MX SabreLite
seems to use 22 MHz, and I can't tell from the code what the SabreSD uses
(probably 22 or 24 MHz). Steve will probably know.

Regards,

	Hans

  reply	other threads:[~2018-04-16 12:26 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-16  1:39 OV5640 with 12MHz xclk Samuel Bobrowicz
2018-04-16 12:26 ` Hans Verkuil [this message]
2018-04-16 18:44   ` Steve Longerbeam
2018-04-16 23:03     ` Samuel Bobrowicz
2018-04-16 13:04 ` Philipp Zabel

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