linux-kernel - Re: [RFC PATCH v2 1/3] usb: dwc3: msm: Add device tree binding information

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Date:	Tue, 13 Aug 2013 10:32:08 +0300
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	balbi@...com
Cc:	Kumar Gala <galak@...eaurora.org>, rob.herring@...xeda.com,
	pawel.moll@....com, mark.rutland@....com, swarren@...dotorg.org,
	ian.campbell@...rix.com, rob@...dley.net,
	gregkh@...uxfoundation.org, grant.likely@...aro.org,
	idos@...eaurora.org, mgautam@...eaurora.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/3] usb: dwc3: msm: Add device tree binding
 information


Hi, 

On Mon, 2013-08-12 at 13:04 -0500, Felipe Balbi wrote: 
> On Fri, Aug 09, 2013 at 10:31:58AM -0500, Kumar Gala wrote:
> > 
> > On Aug 9, 2013, at 4:53 AM, Ivan T. Ivanov wrote:
> > 
> > > From: "Ivan T. Ivanov" <iivanov@...sol.com>
> > > 
> > > MSM USB3.0 core wrapper consist of USB3.0 IP (SNPS)
> > 
> > probably good to spell out Synopsys rather than SNPS
> 
> Synopsys (the company) has always used snps in their bindings though.
> 
> > > +Required properities :
> > > +- compatible : sould be "qcom,dwc3-hsphy";
> > > +- reg : offset and length of the register set in the memory map
> > > +- clocks : phandles to clock instances of the device tree nodes
> > > +- clock-names :
> > > +	"xo" : External reference clock 19 MHz
> > > +	"sleep_a_clk" : Sleep clock, used when USB3 core goes into low
> > > +	power mode (U3).
> > > +<supply-name>-supply : phandle to the regulator device tree node
> > > +Required "supply-name" are:
> > > +	"v1p8" : 1.8v supply for HSPHY
> > > +	"v3p3" : 3.3v supply for HSPHY
> > > +	"vbus" : vbus supply for host mode
> > > +	"vddcx" : vdd supply for HS-PHY digital circuit operation
> 
> I believe these regulators belong to the PHY, not DWC3. Please write a
> PHY driver.
> 

There is already usb phy drivers for these?? 

[PATCH v2 2/3] usb: phy: Add Qualcomm SS-USB and HS-USB drivers for DWC3 core

> > > +Required properities :
> > > +- compatible : sould be "qcom,dwc3-ssphy";
> > > +- reg : offset and length of the register set in the memory map
> > > +- clocks : phandles to clock instances of the device tree nodes
> > > +- clock-names :
> > > +	"xo" : External reference clock 19 MHz
> > > +	"ref_clk" : Reference clock - used in host mode.
> > > +<supply-name>-supply : phandle to the regulator device tree node
> > > +Required "supply-name" are:
> > > +	"v1p8" : 1.8v supply for SS-PHY
> > > +	"vddcx" : vdd supply for SS-PHY digital circuit operation
> 
> likewise, these regulators should be moved to the PHY driver.
> 
> > > +Required properties :
> > > +- compatible : should be "qcom,dwc3"
> > > +- 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 : phandles to clock instances of the device tree nodes
> > > +- clock-names :
> > > +	"core_clk" : Master/Core clock, have to be >= 125 MHz for SS
> > > +	operation and >= 60MHz for HS operation
> > > +	"iface_clk" : System bus AXI clock
> > > +	"sleep_clk" : Sleep clock, used when USB3 core goes into low
> > > +	power mode (U3).
> > > +	"utmi_clk" : Generated by HS-PHY. Used to clock the low power
> > > +	parts of thr HS Link layer.
> > > +
> > > +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.
> > 
> > Is tx-fifo-resize required for qcom,dwc3? if so we should call that
> > out in the binding.
> 
> AFAICT that's only needed for OMAP5 ES1.0. Unless Qualcomm also screwed
> up default TX FIFO sizes :-p

Or it is intentional? :-) Look at [1] dwc3@...00000

Ivan

[1] https://www.codeaurora.org/cgit/quic/la/kernel/msm/tree/arch/arm/boot/dts/apq8084.dtsi?h=msm-3.4

> 


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