Re: [RFC PATCHv2 8/9] ARM: dts: keystone-k2g: add DSS node

[Tomi Valkeinen <tomi.valkeinen@ti.com>]

On 19/06/18 09:19, Tony Lindgren wrote:
> * Tomi Valkeinen <tomi.valkeinen@ti.com> [180618 13:26]:
>> Add DSS node to k2g.dtsi.
>>
>> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
>> Cc: devicetree@vger.kernel.org
>> ---
>>  arch/arm/boot/dts/keystone-k2g.dtsi | 21 +++++++++++++++++++++
>>  1 file changed, 21 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/keystone-k2g.dtsi b/arch/arm/boot/dts/keystone-k2g.dtsi
>> index da78c0034427..d761fe7d46e7 100644
>> --- a/arch/arm/boot/dts/keystone-k2g.dtsi
>> +++ b/arch/arm/boot/dts/keystone-k2g.dtsi
>> @@ -609,5 +609,26 @@
>>  			reg = <0x21010000 0x200>;
>>  			interrupts = <GIC_SPI 123 IRQ_TYPE_EDGE_RISING>;
>>  		};
>> +
>> +		dss: dss@02540000 {
>> +			compatible = "ti,k2g-dss";
>> +
>> +			reg = <0x02540000 0x400>,
>> +			      <0x02550000 0x1000>,
>> +			      <0x02557000 0x1000>,
>> +			      <0x0255a800 0x100>,
>> +			      <0x0255ac00 0x100>;
>> +
>> +			reg-names = "cfg", "common", "vid1", "ovr1", "vp1";
> 
> Can you please check to make sure these are not multiple
> separate devices?
> 
> If they are, flushing posted write to one device will not flush
> anything to the other devices. And that can lead to very hard
> to track down mysterious bugs.

I don't see anything hinting that they would be separate devices, and it
wouldn't really make sense to me either. They're integral parts of the
DISPC. I can see a single port for register access, and a single port
for the pixel data DMA.

 Tomi

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