[PATCH 3/7] dt-bindings: media: Document STM32MP25 VENC video encoder

[Hugues FRUCHET]

Hi Adam,

Thanks for review,

On 10/5/23 01:41, Adam Ford wrote:
> On Wed, Oct 4, 2023 at 4:16 AM Hugues Fruchet
> <hugues.fruchet at foss.st.com> wrote:
>>
>> Add STM32MP25 VENC video encoder bindings.
>>
>> Signed-off-by: Hugues Fruchet <hugues.fruchet at foss.st.com>
>> ---
>>   .../bindings/media/st,stm32mp25-venc.yaml     | 56 +++++++++++++++++++
>>   1 file changed, 56 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/media/st,stm32mp25-venc.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/media/st,stm32mp25-venc.yaml b/Documentation/devicetree/bindings/media/st,stm32mp25-venc.yaml
>> new file mode 100644
>> index 000000000000..c69e0a34f675
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/media/st,stm32mp25-venc.yaml
>> @@ -0,0 +1,56 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/media/st,stm32mp25-venc.yaml#
> 
> Can this dt-binding be made more generic, like something like
> hantro-h1 or VC8000NanoE?
> 
> I think there will be more boards that may incorporate the Hantro-H1
> or a VC8000 in the future, because I don't think this IP is unique to
> the STM32MP25.

This is already the case, check variants in hantro_drv.c.
Several SoCs are sharing this IP but each IP slightly differs because of
supported resolution, codec, preprocessing features, ...
There are also some differences on how clock, interrupt, reset are 
hardware mapped: shared or not by decoder and encoder for ex.

> 
> adam
> 
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: STMicroelectronics STM32MP25 VENC video encoder
>> +
>> +maintainers:
>> +  - Hugues Fruchet <hugues.fruchet at foss.st.com>
>> +
>> +description:
>> +  The STMicroelectronics STM32MP25 SOCs embeds a VENC video hardware encoder
>> +  peripheral based on Verisilicon VC8000NanoE IP (former Hantro H1).
>> +
>> +properties:
>> +  compatible:
>> +    const: st,stm32mp25-venc
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  interrupt-names:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 1
>> +
>> +  clock-names:
>> +    maxItems: 1
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - interrupts
>> +  - interrupt-names
>> +  - clocks
>> +  - clock-names
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>> +    venc: venc at 580e0000 {
>> +        compatible = "st,stm32mp25-venc";
>> +        reg = <0x580e0000 0x800>;
>> +        interrupts = <GIC_SPI 167 IRQ_TYPE_LEVEL_HIGH>;
>> +        interrupt-names = "venc";
> 
> 
> Is the interrupt-names needed if there is only one?
> 

Not really, could be dropped.

>> +        clocks = <&ck_icn_p_venc>;
>> +        clock-names = "venc-clk";
> 
> Same thing for the clock.  if there is only one clock, doe they need names?
> 
Not really, could be dropped.

> adam
>> +    };
>> --
>> 2.25.1
>>

BR,
Hugues.