linux-kernel - Re: [PATCH v5 1/2] Add OV5647 device tree documentation

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Date:   Mon, 12 Dec 2016 11:39:31 +0000
From:   Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>
To:     Sakari Ailus <sakari.ailus@....fi>,
        Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>
CC:     <mchehab@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <robh+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <davem@...emloft.net>,
        <gregkh@...uxfoundation.org>, <geert+renesas@...der.be>,
        <akpm@...ux-foundation.org>, <linux@...ck-us.net>,
        <hverkuil@...all.nl>, <dheitmueller@...nellabs.com>,
        <slongerbeam@...il.com>, <lars@...afoo.de>,
        <robert.jarzmik@...e.fr>, <pavel@....cz>, <pali.rohar@...il.com>,
        <sakari.ailus@...ux.intel.com>, <mark.rutland@....com>,
        <CARLOS.PALMINHA@...opsys.com>
Subject: Re: [PATCH v5 1/2] Add OV5647 device tree documentation

Hi Sakari,

Thank you for the feedback.

On 12/7/2016 10:33 PM, Sakari Ailus wrote:
> Hi Ramiro,
> 
> Thank you for the patch.
> 
> On Mon, Dec 05, 2016 at 05:36:33PM +0000, Ramiro Oliveira wrote:
>> Add device tree documentation.
>>
>> Signed-off-by: Ramiro Oliveira <roliveir@...opsys.com>
>> ---
>>  .../devicetree/bindings/media/i2c/ov5647.txt          | 19 +++++++++++++++++++
>>  1 file changed, 19 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/media/i2c/ov5647.txt
>>
>> diff --git a/Documentation/devicetree/bindings/media/i2c/ov5647.txt b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
>> new file mode 100644
>> index 0000000..4c91b3b
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/i2c/ov5647.txt
>> @@ -0,0 +1,19 @@
>> +Omnivision OV5647 raw image sensor
>> +---------------------------------
>> +
>> +OV5647 is a raw image sensor with MIPI CSI-2 and CCP2 image data interfaces
>> +and CCI (I2C compatible) control bus.
>> +
>> +Required properties:
>> +
>> +- compatible	: "ovti,ov5647";
>> +- reg		: I2C slave address of the sensor;
>> +
>> +The common video interfaces bindings (see video-interfaces.txt) should be
>> +used to specify link to the image data receiver. The OV5647 device
>> +node should contain one 'port' child node with an 'endpoint' subnode.
>> +
>> +Following properties are valid for the endpoint node:
>> +
>> +- data-lanes : (optional) specifies MIPI CSI-2 data lanes as covered in
>> +  video-interfaces.txt.  The sensor supports only two data lanes.
> 
> Doesn't this sensor require a external clock, a reset GPIO and / or a
> regulator or a few? Do you need data-lanes, unless you can change the order
> or the number?

In the setup I'm using, I'm not aware of any reset GPIO or regulator. I do use a
external clock but it's fixed and not controlled by SW. Should I add a property
for this?

> 
> An example DT snippet wouldn't hurt.

Sure, I can add a example snippet.

>