Re: [PATCH v8 1/2] dt-bindings: PCI: meson: add DT bindings for Amlogic Meson PCIe controller

[Martin Blumenstingl]

Hi Rob, Hi Hanjie,

(sorry for being late with my question)

On Tue, Dec 18, 2018 at 9:05 AM Hanjie Lin <hanjie.lin@xxxxxxxxxxx> wrote:
[...]
> +- reg-names: Must be
> +       - "elbi"        External local bus interface registers
> +       - "cfg"         Meson specific registers
> +       - "phy"         Meson PCIE PHY registers
I have learned that there are two PHY register designs:
- AXG only has a PCIe PHY
- G12A has a PHY which supports PCIe and USB 3.0. The PCIe part of
this PHY design is compatible with AXG, but this design also supports
a USB 3.0 port (it's an exclusive choice: either PCIe *or* USB 3.0)

The PCIe controller itself is identical on both, AXG and G12A.
This patch adds support for the AXG PCIe controller and PHY within one
device-tree node.

For G12A I propose to add a separate "phys" property with a phandle to
the "combo" PCIe and USB3.0 PHY - this can be part of a separate patch
though.
I would like to know whether it's OK that for AXG the PCIe PHY is
described in the same device-tree node as the PCIe controller (in
other words: we're not using a "phys" property here)?


Kind Regards
Martin