On Wed, Jan 16, 2019 at 02:20:21PM +0100, Miquel Raynal wrote:
> Hi Rob,
>
> Rob Herring <[email protected]> wrote on Tue, 15 Jan 2019 15:44:29 -0600:
>
> > On Fri, Jan 11, 2019 at 02:31:29PM +0100, Miquel Raynal wrote:
> > > Add bindings for Marvell Armada 3700 USB2 UTMI+ PHY.
> > >
> > > Signed-off-by: Miquel Raynal <[email protected]>
> > > ---
> > > .../bindings/phy/phy-mvebu-utmi.txt | 37 +++++++++++++++++++
> > > 1 file changed, 37 insertions(+)
> > > create mode 100644
> > > Documentation/devicetree/bindings/phy/phy-mvebu-utmi.txt
> > >
> > > diff --git a/Documentation/devicetree/bindings/phy/phy-mvebu-utmi.txt
> > > b/Documentation/devicetree/bindings/phy/phy-mvebu-utmi.txt
> > > new file mode 100644
> > > index 000000000000..4ade05ce5d51
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/phy/phy-mvebu-utmi.txt
> > > @@ -0,0 +1,37 @@
> > > +MVEBU A3700 UTMI PHY
> > > +--------------------
> > > +
> > > +USB2 UTMI+ PHY controllers can be found on the following Marvell MVEBU
> > > SoCs:
> > > +* Armada 3700
> > > +
> > > +On Armada 3700, there are two USB controllers, one is compatible with
> > > the USB2
> > > +and USB3 specifications and supports OTG. The other one is USB2
> > > compliant and
> > > +only supports host mode. Both of these controllers come with a UTMI PHY.
> > >
> >
> > This paragraph says the controllers are different, but are the PHYs
> > different?
>
> Yes they are. I will make it appear clearly in the v3.
>
> >
> > > +
> > > +Required Properties:
> > > +
> > > +- compatible: Should be one of:
> > > + * "marvell,a3700-utmi-host-phy" for the PHY connected to
> > > + the USB2 host-only controller.
> > > + * "marvell,a3700-utmi-otg-phy" for the PHY connected to
> > > + the USB3 and USB2 OTG capable controller.
> > > +- reg: PHY IP register range.
> > > +- marvell,usb-misc-reg: handle on the "USB miscellaneous registers"
> > > shared
> > > + region covering registers related to both the host
> > > + controller and the PHY.
> > > +- #phy-cells: Standard property (Documentation: phy-bindings.txt) Should
> > > be 0.
> > > +
> > > +
> > > +Example:
> > > +
> > > + usb2_utmi_host_phy: phy@5f000 {
> > > + compatible = "marvell,armada-3700-utmi-host-phy";
> > > + reg = <0x5f000 0x800>;
> > > + marvell,usb-misc-reg = <&usb2_syscon>;
> > > + #phy-cells = <0>;
> > > + };
> > > +
> > > + usb2_syscon: system-controller@5f800 {
> > > + compatible = "syscon", "simple-mfd";
> >
> > This is not valid because there's not a specific compatible string and
> > 'simple-mfd' implies there are child nodes.
>
> What do you suggest? Is compatible = "syscon"; enough?
No.
> This is just an
> area with a few registers that do not belong to any specific IP.
Must be some name for the registers in the datasheet?
> There
> are registers that are related to the control of the USB controller,
> and registers that are related to the PHY. It's quite challenging to
> find a meaningful specific compatible string. Is it mandatory to add
> one? If yes, would "marvell,armada-3700-usb-utmi-{host,otg}-misc" fit?
Yes, if there's not a name from the datasheet.
Rob
