linux-kernel - Re: [PATCH] ARM: at91/dt: ov2640: add hsync/vsync-active property

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Date:	Mon, 21 Sep 2015 09:19:48 +0800
From:	Josh Wu <josh.wu@...el.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@....linux.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	<linux-kernel@...r.kernel.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	<devicetree@...r.kernel.org>, "Rob Herring" <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH] ARM: at91/dt: ov2640: add hsync/vsync-active property

Hi, Nicolas

On 9/18/2015 10:09 PM, Nicolas Ferre wrote:
> Le 18/09/2015 13:28, Josh Wu a écrit :
>> On at91sam9x5ek/at91sam9m10g45ek/sama5d3xek boards, we use the parallel
>> connection for ov2640. So we must set the hsync/vsync property (1 means
>> active high).
>> Otherwise, the connection would be seen as BT.656 or BT.1120.
>>
>> Signed-off-by: Josh Wu <josh.wu@...el.com>
> Hi Josh,
>
> Does this patch apply because of the new enhancement that you had
> proposed in "media: atmel-isi: parse the DT parameters for
> vsync/hsync/pixclock polarity" or does it apply even before?
> Is it a fix that applies to older kernels?
It's is a fix, according to the dt binding of video interface.
So it should be applied before:

"media: atmel-isi: parse the DT parameters for
vsync/hsync/pixclock polarity".


it has no impact in older kernel as the driver doesn't parse that 
property yet.

>
> So, should I wait for the enhancements to enter media git tree or can I
> take them anyway?

yes, you can take it without waiting for the media tree. Thanks.

Best Regards,
Josh Wu

>
> Bye,
>
>> ---
>>
>>   arch/arm/boot/dts/at91sam9m10g45ek.dts | 2 ++
>>   arch/arm/boot/dts/at91sam9x5ek.dtsi    | 2 ++
>>   arch/arm/boot/dts/sama5d3xmb.dtsi      | 2 ++
>>   3 files changed, 6 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/at91sam9m10g45ek.dts b/arch/arm/boot/dts/at91sam9m10g45ek.dts
>> index d1ae60a..9d16ef8 100644
>> --- a/arch/arm/boot/dts/at91sam9m10g45ek.dts
>> +++ b/arch/arm/boot/dts/at91sam9m10g45ek.dts
>> @@ -198,6 +198,8 @@
>>   					isi_0: endpoint {
>>   						remote-endpoint = <&ov2640_0>;
>>   						bus-width = <8>;
>> +						vsync-active = <1>;
>> +						hsync-active = <1>;
>>   					};
>>   				};
>>   			};
>> diff --git a/arch/arm/boot/dts/at91sam9x5ek.dtsi b/arch/arm/boot/dts/at91sam9x5ek.dtsi
>> index d237c46..479f200 100644
>> --- a/arch/arm/boot/dts/at91sam9x5ek.dtsi
>> +++ b/arch/arm/boot/dts/at91sam9x5ek.dtsi
>> @@ -66,6 +66,8 @@
>>   					isi_0: endpoint@0 {
>>   						remote-endpoint = <&ov2640_0>;
>>   						bus-width = <8>;
>> +						vsync-active = <1>;
>> +						hsync-active = <1>;
>>   					};
>>   				};
>>   			};
>> diff --git a/arch/arm/boot/dts/sama5d3xmb.dtsi b/arch/arm/boot/dts/sama5d3xmb.dtsi
>> index 83bee7a..8901042 100644
>> --- a/arch/arm/boot/dts/sama5d3xmb.dtsi
>> +++ b/arch/arm/boot/dts/sama5d3xmb.dtsi
>> @@ -87,6 +87,8 @@
>>   					isi_0: endpoint {
>>   						remote-endpoint = <&ov2640_0>;
>>   						bus-width = <8>;
>> +						vsync-active = <1>;
>> +						hsync-active = <1>;
>>   					};
>>   				};
>>   			};
>>
>

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