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SubjectRe: [RFC PATCH 3/3] dt-bindings: display: add Amlogic Meson DRM Bindings
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Hi Laurent,
On 11/28/2016 10:37 AM, Laurent Pinchart wrote:
> Hi Neil,
>
> On Monday 28 Nov 2016 10:23:43 Neil Armstrong wrote:
>> On 11/28/2016 09:33 AM, Laurent Pinchart wrote:
>>> On Friday 25 Nov 2016 17:03:11 Neil Armstrong wrote:
>>>> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
>>>> ---
>>>>
>>>> .../bindings/display/meson/meson-drm.txt | 134 +++++++++++++++
>>>> 1 file changed, 134 insertions(+)
>>>> create mode 100644
>>>>
>>>> Documentation/devicetree/bindings/display/meson/meson-drm.txt
>>>>
>>>> diff --git
>>>> a/Documentation/devicetree/bindings/display/meson/meson-drm.txt
>>>> b/Documentation/devicetree/bindings/display/meson/meson-drm.txt new file
>>>> mode 100644
>>>> index 0000000..89c1b5f
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/display/meson/meson-drm.txt

[...]

>>>> +
>>>> +VENC CBVS Output
>>>> +----------------------
>>>> +
>>>> +The VENC can output Composite/CVBS output via a decicated VDAC.
>>>> +
>>>> +Required properties:
>>>> + - compatible: value must be one of:
>>>> + - compatible: value should be different for each SoC family as :
>>> One of those two lines is redundant.
>>
>> Will fix.
>>
>>>> + - GXBB (S905) : "amlogic,meson-gxbb-venc-cvbs"
>>>> + - GXL (S905X, S905D) : "amlogic,meson-gxl-venc-cvbs"
>>>> + - GXM (S912) : "amlogic,meson-gxm-venc-cvbs"
>>>> + followed by the common "amlogic,meson-gx-venc-cvbs"
>>>> +
>>>
>>> No registers ? Are the encoders registers part of the VPU register space,
>>> intertwined in a way that they can't be specified separately here ?
>>
>> Exact, all the video registers on the Amlogic SoC are part of a long history
>> of fixup/enhance from very old SoCs, it's quite hard to distinguish a Venc
>> registers array since they are mixed with the multiple encoders
>> registers...
>
> In that case is there really a reason to model the encoders as separate nodes
> in DT ?

Here, it more the encoder-connector couple that is represented as a node, and
the CVBS output is optional.

>
>> The only separate registers are the VDAC and HDMI PHY, I may move them to
>> these separate nodes since they are part of the HHI register space.
>>
>> It is a problem if I move them in the next release ? Next release will
>> certainly have HDMI support, and will have these refactorings.
>
> Given that DT bindings are considered as a stable ABI, I'm afraid it's an
> issue.

OK, I will add the VDAC/HDMI PHY registers as part if these output nodes.

>
>>>> +- ports: A ports node with endpoint definitions as defined in
>>>> + Documentation/devicetree/bindings/media/video-interfaces.txt. The
>>>> + first port should be the input endpoints, connected ot the VPU node.
>>>> +
>>>> +Example:
>>>> +
>>>> +venc_cvbs: venc-cvbs {
>>>> + compatible = "amlogic,meson-gxbb-venc-cvbs";
>>>> + status = "okay";
>>>> +
>>>> + ports {
>>>> + #address-cells = <1>;
>>>> + #size-cells = <0>;
>>>> +
>>>> + enc_cvbs_in: port@0 {
>>>> + #address-cells = <1>;
>>>> + #size-cells = <0>;
>>>> + reg = <0>;
>>>> +
>>>> + venc_cvbs_in_vpu: endpoint@0 {
>>>> + reg = <0>;
>>>> + remote-endpoint = <&vpu_out_venc_cvbs>;
>>>> + };
>>>> + };
>>>> + };
>>>> +};
>>>> +
>>>> +vpu: vpu@d0100000 {
>>>> + compatible = "amlogic,meson-gxbb-vpu";
>>>> + reg = <0x0 0xd0100000 0x0 0x100000>,
>>>> + <0x0 0xc883c000 0x0 0x1000>,
>>>> + <0x0 0xc8838000 0x0 0x1000>;
>>>> + reg-names = "base", "hhi", "dmc";
>>>> + interrupts = <GIC_SPI 3 IRQ_TYPE_EDGE_RISING>;
>>>> +
>>>> + ports {
>>>> + #address-cells = <1>;
>>>> + #size-cells = <0>;
>>>> +
>>>> + vpu_out: port@1 {
>>>> + #address-cells = <1>;
>>>> + #size-cells = <0>;
>>>> + reg = <1>;
>>>> +
>>>> + vpu_out_venc_cvbs: endpoint@0 {
>>>> + reg = <0>;
>>>> + remote-endpoint = <&venc_cvbs_in_vpu>;
>>>> + };
>>>> + };
>>>> + };
>>>> +};
>>
>> Thanks for the review !
>

Neil

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