Re: [PATCH v3 2/6] dt-bindings: display: Add Synopsys DW MIPI DSI DRM bridge driver

Hello,


On 09-06-2017 05:11, Archit Taneja wrote:

Hi Philippe, Rob,

On 06/08/2017 09:10 PM, Rob Herring wrote:

quoted

Seems strange there's not also a pixel or bit clock? Or this
gets driven
from the phy?

Since you mention phy here, I wanted to share a concern with
the bindings.
These bindings don't have a separate PHY DT node. The PHY is
assumed as a
part of the IP when integrated by a SoC. There are already
rockchip and
hisil DSI bindings that use this IP but don't define a PHY node.

It's a similar situation with the DW-HDMI bindings.

For example, when the DW HDMI is integrated in rockchip or
renesas SoC, the
bindings "rockchip,rk3288-dw-hdmi" or "renesas,r8a7795-dw-hdmi"
are used,
and they don't have a separate PHY DT node.

I wasn't sure whether this is the right way to proceed or not
for such IPs.
Some advice would help us here.

Thanks,
Archit

I just want to add that read/writes from/to phy are done using
the controller (in HDMI and in MIPI DSI Host), so the only way to
have a phy driver is that if some custom callbacks are provided
or if the memory region is shared.

Anyway, I agree with Archit in the sense that phy + controller
are highly tied. Also, these two "pieces" are SoC specific and
sometimes very different between SoC's because they can be
customized so I think a different compatible string suits well here.

Best regards,
Jose Miguel Abreu
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