Re: [PATCH v3] arm: dts: AM43x: Add usb DT nodes for AM4372

[George Cherian]

Hi Benoit ,

Thanks for your review.

On 8/14/2013 8:04 PM, Benoit Cousson wrote:
> + Roger
>
> Hi George,
>
> Yes, I had some comment about the "ti'type" in Roger's series that 
> will be applicable here as well.


> On 14/08/2013 16:16, George Cherian wrote:
> > +Benoit
> >   If you dont have any comments, can you take this for 3.12?
> >
> > Regards
> > -George
> >
> > On 7/10/2013 1:44 PM, George Cherian wrote:
> >
> > > This patch adds
> > >     - HS USB nodes
> > >     - phy nodes
> > >     - usb control module nodes.
> > >
> > > Signed-off-by: George Cherian <george.cherian@xxxxxx>
> > > ---
> > >
> > > changes from v2
> > > change synopsis to snps
> > > use simple node names
> > > add both USB and PHY instances
> > > add usbctrl node
> > >
> > > changes from v1
> > > renamed synopsis to snps
> > > removed flag tx-fifo-resize
> > >
> > >   arch/arm/boot/dts/am4372.dtsi | 58
> > > +++++++++++++++++++++++++++++++++++++++++++
> > >   1 file changed, 58 insertions(+)
> > >
> > > diff --git a/arch/arm/boot/dts/am4372.dtsi
> > > b/arch/arm/boot/dts/am4372.dtsi
> > > index ddc1df7..37f196f 100644
> > > --- a/arch/arm/boot/dts/am4372.dtsi
> > > +++ b/arch/arm/boot/dts/am4372.dtsi
> > > @@ -64,5 +64,63 @@
> > >               compatible = "ti,am4372-counter32k","ti,omap-counter32k";
> > >               reg = <0x44e86000 0x40>;
> > >           };
> > > +
> > > +        phy1: usbphy1 {
> > > +            compatible = "ti,am4372-usb2";
>
> That's not a very good name for a phy? It looks like a usb module.
>
> The bindings specify only ti,omap-usb2 or ti,omap-usb3 for USB2 or USB3.
> I guess it should be one of them and potentially the binding should be 
> updated with ti,omap-usb2-phy and ti,omap-usb3-phy names while we can 
> still do it.
>
> > > +            #phy-cells = <0>;
> > > +            id = <0>;
> > > +            status = "disabled";
> > > +        };
> > > +
> > > +        phy2: usbphy2 {
>
> Why do you need a different node name here? It should be a generic 
> name to identify the function, so usbphy or usb-phy seems good enough.

There are 2 instances of usb controllers and these instances for those 2 
phys, which essentially dont have any reg property. So I named it as 
usbphy1 and usbphy2.
> > > +            compatible = "ti,am4372-usb2";
> > > +            #phy-cells = <0>;
> > > +            id = <1>;
> > > +            status = "disabled";
> > > +        };
> > > +
> > > +        usbctrl: omap-control-usb@44e10620 {
> > > +            compatible = "ti,omap-control-usb";
> > > +            reg = <0x44e10620 0x10>;
> > > +            reg-names = "control_dev_conf";
> > > +            ti,type = <3>;
> > > +            status = "disabled";
> > > +        };
> > > +
> > > +        usb1: am4372_dwc3@48380000 {
> > > +            status = "disabled";
> > > +            compatible = "ti,am4372-dwc3";
> > > +            reg = <0x48380000 0x200>;
> > > +            interrupts = <GIC_SPI 172 IRQ_TYPE_LEVEL_HIGH>;
> > > +            #address-cells = <1>;
> > > +            #size-cells = <1>;
> > > +            utmi-mode = <1>;
> > > +            ranges;
>
> A blank line here will be nice.

okay
> > > +            dwc3@48390000 {
> > > +                compatible = "snps,dwc3";
> > > +                reg = <0x48390000 0xd000>;
> > > +                interrupts = <GIC_SPI  168 IRQ_TYPE_LEVEL_HIGH>;
> > > +                phys = <&phy1>;
> > > +                phy-names = "am4372-usb1";
>
> What is the purpose of the phy-names? Is it relevant to add the SoC 
> name in something that usually, at least for the clocks and IRQs, is 
> IP specific?
>
> The current documentation does not explain it and does not support 
> phys property either.
>
>   synopsys DWC3 CORE
>
>   DWC3- USB3 CONTROLLER
>
>   Required properties:
>    - compatible: must be "synopsys,dwc3"
>    - reg : Address and length of the register set for the device
>    - interrupts: Interrupts used by the dwc3 controller.
>    - usb-phy : array of phandle for the PHY device
>
> Is there some binding update ongoing for 3.12?

The phy part, especially was added with the generic phy framework in 
mind. The generic phy framework uses phys and phy-names instead of usb-phy.
Also all synopsys  references for compatible are being replaced with snps.

> > > +            };
> > > +        };
> > > +
> > > +        usb2: am4372_dwc3@483c0000 {
> > > +            status = "disabled";
> > > +            compatible = "ti,am4372-dwc3";
> > > +            reg = <0x483c0000 0x200>;
> > > +            interrupts = <GIC_SPI 178 IRQ_TYPE_LEVEL_HIGH>;
> > > +            #address-cells = <1>;
> > > +            #size-cells = <1>;
> > > +            utmi-mode = <1>;
> > > +            ranges;
>
> A blank line here will be nice.

okay
> > > +            dwc3@483d0000 {
> > > +                compatible = "snps,dwc3";
> > > +                reg = <0x483d0000 0xd000>;
> > > +                interrupts = <GIC_SPI  174 IRQ_TYPE_LEVEL_HIGH>;
> > > +                phys = <&phy2>;
> > > +                phy-names = "am4372-usb2";
> > > +            };
> > > +        };
> > >       };
> > >   };
>
> Regards,
> Benoit


--
-George

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