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SubjectRe: [PATCH 1/2] dt-bindings: phy: Add Qualcomm Synopsys High-Speed USB PHY binding
Hi Rob,

On Mon, Nov 12, 2018 at 01:24:51PM -0600, Rob Herring wrote:
> On Thu, Nov 08, 2018 at 03:04:48PM +0800, Shawn Guo wrote:
> > From: Sriharsha Allenki <sallenki@codeaurora.org>
> >
> > It adds bindings for Synopsys 28nm femto phy controller that supports
> > LS/FS/HS usb connectivity on Qualcomm chipsets.
> >
> > Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>
> > Signed-off-by: Anu Ramanathan <anur@codeaurora.org>
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> > Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> > ---
> > .../phy/qcom,snps-28nm-usb-hs-phy.txt | 101 ++++++++++++++++++
> > 1 file changed, 101 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/phy/qcom,snps-28nm-usb-hs-phy.txt
> >
> > diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-28nm-usb-hs-phy.txt b/Documentation/devicetree/bindings/phy/qcom,snps-28nm-usb-hs-phy.txt
> > new file mode 100644
> > index 000000000000..75e7a09dd558
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/phy/qcom,snps-28nm-usb-hs-phy.txt
> > @@ -0,0 +1,101 @@
> > +Qualcomm Synopsys 28nm Femto phy controller
> > +===========================================
> > +
> > +Synopsys 28nm femto phy controller supports LS/FS/HS usb connectivity on
> > +Qualcomm chipsets.
> > +
> > +Required properties:
> > +
> > +- compatible:
> > + Value type: <string>
> > + Definition: Should contain "qcom,usb-snps-hsphy".
>
> SoC specific compatible?

Agreed. A SoC prefixed compatible would be more specific and scalable
for handling different programming model of the same IP. I will use
"qcom,qcs404-usb-hsphy" in v3.

>
> > +
> > +- reg:
> > + Value type: <prop-encoded-array>
> > + Definition: USB PHY base address and length of the register map.
> > +
> > +- #phy-cells:
> > + Value type: <u32>
> > + Definition: Should be 0.
> > +
> > +- clocks:
> > + Value type: <prop-encoded-array>
> > + Definition: See clock-bindings.txt section "consumers". List of
> > + three clock specifiers for reference, phy core and
> > + sleep clocks.
> > +
> > +- clock-names:
> > + Value type: <string>
> > + Definition: Names of the clocks in 1-1 correspondence with the "clocks"
> > + property. Must contain "ref", "phy" and "sleep".
> > +
> > +- resets:
> > + Value type: <prop-encoded-array>
> > + Definition: See reset.txt section "consumers". PHY reset specifiers
> > + for phy core and POR resets.
> > +
> > +- reset-names:
> > + Value type: <string>
> > + Definition: Names of the resets in 1-1 correspondence with the "resets"
> > + property. Must contain "phy" and "por".
> > +
> > +- vdd-supply:
> > + Value type: <phandle>
> > + Definition: phandle to the regulator VDD supply node.
> > +
> > +- vdda1p8-supply:
> > + Value type: <phandle>
> > + Definition: phandle to the regulator 1.8V supply node.
> > +
> > +- vdda3p3-supply:
> > + Value type: <phandle>
> > + Definition: phandle to the regulator 3.3V supply node.
> > +
> > +- qcom,vdd-voltage-level:
> > + Value type: <prop-array>
> > + Definition: This is a list of three integer values <no min max> where
> > + each value corresponding to voltage corner in uV.
> > +
> > +Optional properties:
> > +
> > +- extcon:
> > + Value type: <prop-encoded-array>
> > + Definition: Should contain the vbus extcon.
>
> Don't use extcon for new bindings. Use usb-connector binding.

Okay, I just did a bit of research and found that 'extcon' is becoming
a deprecated DT property recently and we should OF graph bindings to
specify the connector. Will do in v3.

>
> > +
> > +- qcom,init-seq:
> > + Value type: <u32 array>
> > + Definition: Should contain a sequence of <offset value delay> tuples to
> > + program 'value' into phy register at 'offset' with 'delay'
> > + in us afterwards.
>
> If we wanted this type of thing in DT, we'd have a generic binding (or
> forth).

Right now, this is a qualcomm usb phy specific bindings - first used in
qcom,usb-hs-phy.txt and I extended it a bit for my phy. As this is not
a so good hardware description, I'm a little hesitated to make it
generic for other platforms to use in general. What about we put off it
a little bit until we see more platforms need the same thing?

Shawn

> This should probably be split between SoC specific settings in
> the driver and board properties in DT.

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