linux-kernel - Re: [RFC 2/2] usb: dwc3: Add Qualcomm DWC3 glue layer driver

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Message-ID: <1375796793.2027.20.camel@iivanov-dev.int.mm-sol.com>
Date:	Tue, 06 Aug 2013 16:46:33 +0300
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Pawel Moll <pawel.moll@....com>
Cc:	"balbi@...com" <balbi@...com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Mark Rutland <Mark.Rutland@....com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [RFC 2/2] usb: dwc3: Add Qualcomm DWC3 glue layer driver

On Tue, 2013-08-06 at 13:21 +0100, Pawel Moll wrote:
> On Tue, 2013-08-06 at 12:53 +0100, Ivan T. Ivanov wrote:
> > From: "Ivan T. Ivanov" <iivanov@...sol.com>
> > 
> > Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
> 
> The same comment as for the RFC 1/2 here...

Will fix this.

> 
> >  .../devicetree/bindings/usb/msm-ssusb.txt          |   39 +++++
> >  drivers/usb/dwc3/Kconfig                           |    8 +
> >  drivers/usb/dwc3/Makefile                          |    1 +
> >  drivers/usb/dwc3/dwc3-msm.c                        |  175 ++++++++++++++++++++
> >  4 files changed, 223 insertions(+)
> >  create mode 100644 drivers/usb/dwc3/dwc3-msm.c
> > 
> > diff --git a/Documentation/devicetree/bindings/usb/msm-ssusb.txt b/Documentation/devicetree/bindings/usb/msm-ssusb.txt
> > index 550b496..313ae0d 100644
> > --- a/Documentation/devicetree/bindings/usb/msm-ssusb.txt
> > +++ b/Documentation/devicetree/bindings/usb/msm-ssusb.txt
> > @@ -22,6 +22,23 @@ Required "supply-name" examples are:
> >  	"v1p8" : 1.8v supply for SS-PHY
> >  	"vddcx" : vdd supply for SS-PHY digital circuit operation
> >  
> > +Required properties :
> > +- compatible : should be "qcom,dwc-usb3-msm"
> > +- reg : offset and length of the register set in the memory map
> > +	offset and length of the TCSR register for routing USB
> > +	signals to either picoPHY0 or picoPHY1.
> > +- clocks = <&usb30_master_cxc>, <&sys_noc_usb3_axi_cxc>, <&usb30_sleep_cxc>, <&usb30_mock_utmi_cxc>;
> > +- clock-names = "core_clk", "iface_clk", "sleep_clk", "utmi_clk";
> > +
> > +Optional properties :
> > +- gdsc-supply : phandle to the globally distributed switch controller
> > +  regulator node to the USB controller.
> > +
> > +Sub nodes:
> > +- Sub node for "DWC3- USB3 controller".
> > +  This sub node is required property for device node. The properties of this subnode
> > +  are specified in dwc3.txt.
> 
> Ah, this answers one of my questions - DWC3 comes from Synopsys.

Yes, sorry.

> 
> >  Example device nodes:
> >  
> >  	dwc3_usb2: phy@...f8800 {
> > @@ -47,3 +64,25 @@ Example device nodes:
> >  		vddcx-supply = <&supply>;
> >  		v1p8-supply = <&supply>;
> >  	};
> > +
> > +	usb@...ab000 {
> > +		compatible = "qcom,dwc-usb3-msm";
> > +		#address-cells = <1>;
> > +		#size-cells = <1>;
> > +		reg = <0xfd4ab000 0x4>;
> > +
> > +		clocks = <&usb30_master_cxc>, <&sys_noc_usb3_axi_cxc>, <&usb30_sleep_cxc>, <&usb30_mock_utmi_cxc>;
> > +		clock-names = "core_clk", "iface_clk", "sleep_clk", "utmi_clk";
> > +
> > +		gdsc-supply = <&supply>;
> > +		ranges;
> > +
> > +		dwc3@...00000 {
> > +			compatible = "snps,dwc3";
> 
> Note that the Documentation/devicetree/bindings/usb/dwc3.txt is
> mentioning "synopsys,dwc3" (which is clearly in opposition to the
> vendor-prefixes.txt file) and this compatible value is used in the
> drivers/usb/dwc3/core.c and omap5.dtsi. Unless it has been already fixed
> recently, could you take care of that?

Yes, it is fixed already. Patch is in linux-next 
"usb: dwc3: core: switch to snps,dwc3"

> 
> > +			reg = <0xf9200000 0xcd00>;
> > +			interrupts = <0 131 0>;
> > +			interrupt-names = "irq";
> > +			usb-phy = <&dwc3_usb2>, <&dwc3_usb3>;
> > +			tx-fifo-resize;
> > +		};
> > +	};
> 
> And now I'm really confused... Maybe it's just lack of documentation...
> 
> How does the "qcom,dwc-usb3-msm" relate to "qcom,dwc-usb3"?

Not sure from where you get this "qcom,dwc-usb3", but now I think
that "qcom,dwc-usb3" should be enough for compatible.  

Thanks, 
Ivan

> 
> Paweł


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