linux-kernel - Re: [PATCH v3 1/2] media: dt-bindings: media: xilinx: Add Xilinx MIPI CSI-2 Rx Subsystem

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Message-ID: <1f698576-89b2-e264-387e-6db4c5a4713a@lucaceresoli.net>
Date:   Mon, 11 Mar 2019 13:08:06 +0100
From:   Luca Ceresoli <luca@...aceresoli.net>
To:     Vishal Sagar <vsagar@...inx.com>,
        Vishal Sagar <vishal.sagar@...inx.com>,
        Hyun Kwon <hyunk@...inx.com>,
        "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        Michal Simek <michals@...inx.com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "sakari.ailus@...ux.intel.com" <sakari.ailus@...ux.intel.com>,
        "hans.verkuil@...co.com" <hans.verkuil@...co.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dinesh Kumar <dineshk@...inx.com>,
        Sandip Kothari <sandipk@...inx.com>
Subject: Re: [PATCH v3 1/2] media: dt-bindings: media: xilinx: Add Xilinx MIPI
 CSI-2 Rx Subsystem

Hi Vishal,

On 08/03/19 20:04, Vishal Sagar wrote:
>>> +Optional properties:
>>> +--------------------
>>> +- xlnx,vfb: This is present when Video Format Bridge is enabled.
>>> +  Without this property the driver won't be loaded as IP won't be able to
>> generate
>>> +  media bus format compliant stream output.
>>> +- xlnx,en-csi-v2-0: Present if CSI v2 is enabled in IP configuration.
>>> +- xlnx,en-vcx: When present, there are maximum 16 virtual channels, else
>>> +  only 4. This is present only if xlnx,en-csi-v2-0 is present.
>>> +- xlnx,en-active-lanes: Enable Active lanes configuration in Protocol
>>> +  Configuration Register.
>>
>> This doesn't seem very clear to me. According to my understanding of the
>> IP and driver, I'd rather rephrase as:
>>
>> - xlnx,en-active-lanes: present if the number of active lanes can be
>>   reconfigured at runtime in the Protocol Configuration Register.
>>   If present, the V4L2_CID_XILINX_MIPICSISS_ACT_LANES is added.
>>   Otherwise all lanes are always active.
>>
> 
> Your description is better. I will update with this in next version.

Ok, thanks. But I just noticed an error in my own words...
"V4L2_CID_XILINX_MIPICSISS_ACT_LANES is added" ->
"V4L2_CID_XILINX_MIPICSISS_ACT_LANES control is added".

-- 
Luca