Re: [PATCH v5 5/5] usb: dwc3: rockchip: add devicetree bindings documentation

[William Wu]

Dear Heiko,

On 06/30/2016 08:15 PM, Heiko Stuebner wrote:
> Hi William,
>
> Am Donnerstag, 30. Juni 2016, 19:16:40 schrieb William Wu:
> > This patch adds the devicetree documentation required for Rockchip
> > USB3.0 core wrapper consisting of USB3.0 IP from Synopsys.
> >
> > It supports DRD mode, and could operate in device mode (SS, HS, FS)
> > and host mode (SS, HS, FS, LS).
> >
> > Signed-off-by: William Wu <william.wu@xxxxxxxxxxxxxx>
> > ---
> > Changes in v5:
> > - rename clock-names, and remove unnecessary clocks (Heiko)
> >
> > Changes in v4:
> > - modify commit log, and add phy documentation location (Sergei)
> >
> > Changes in v3:
> > - add dwc3 address (balbi)
> >
> > Changes in v2:
> > - add rockchip,dwc3.txt to Documentation/devicetree/bindings/ (balbi,
> > Brian)
> >
> >   .../devicetree/bindings/usb/rockchip,dwc3.txt      | 40
> > ++++++++++++++++++++++ 1 file changed, 40 insertions(+)
> >   create mode 100644
> > Documentation/devicetree/bindings/usb/rockchip,dwc3.txt
> >
> > diff --git a/Documentation/devicetree/bindings/usb/rockchip,dwc3.txt
> > b/Documentation/devicetree/bindings/usb/rockchip,dwc3.txt new file mode
> > 100644
> > index 0000000..9c85e19
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/usb/rockchip,dwc3.txt
> > @@ -0,0 +1,40 @@
> > +Rockchip SuperSpeed DWC3 USB SoC controller
> > +
> > +Required properties:
> > +- compatible:	should contain "rockchip,rk3399-dwc3" for rk3399 SoC
> > +- clocks:	A list of phandle + clock-specifier pairs for the
> > +		clocks listed in clock-names
> > +- clock-names:	Should contain the following:
> > +  "ref_clk"	Controller reference clk, have to be 24 MHz
> > +  "suspend_clk"	Controller suspend clk, have to be 24 MHz or 32 KHz
> > +  "bus_clk_otg0"Master/Core clock, have to be >= 62.5 MHz for SS
> > +		operation and >= 60MHz for HS operation
> why is it called "bus_clk_otg0" not just simply "bus_clk". As far as I
> understand it (and see it in the TRM), you have two dwc3 controllers
> (otg0 and otg1) and clock-names are always meant from the perspective of
> the individual ip-block. So a devicetree would have:
>
> 	usbdrd3_0: usb@fe800000 {
> 		compatible = "rockchip,rk3399-dwc3";
> 		clocks = <&cru SCLK_USB3OTG0_REF>, <&cru SCLK_USB3OTG0_SUSPEND>,
> 			 <&cru ACLK_USB3OTG0>, <&cru ACLK_USB3_GRF>;
> 		clock-names = "ref_clk", "suspend_clk",
> 			      "bus_clk", "grf_clk";
> 		...
> 	};
>
> 	usbdrd3_1: usb@fe900000 {
> 		compatible = "rockchip,rk3399-dwc3";
> 		clocks = <&cru SCLK_USB3OTG1_REF>, <&cru SCLK_USB3OTG1_SUSPEND>,
> 			 <&cru ACLK_USB3OTG1>, <&cru ACLK_USB3_GRF>;
> 		clock-names = "ref_clk", "suspend_clk",
> 			      "bus_clk", "grf_clk";
> 		...
> 	};
>
>
> The rest looks really nice now.
Ah, it looks very goog to me. I'll fix it immediately.
Thank you very much!
> Heiko
>
> > +  "grf_clk"	Controller grf clk
> > +
> > +Required child node:
> > +A child node must exist to represent the core DWC3 IP block. The name of
> > +the node is not important. The content of the node is defined in
> > dwc3.txt. +
> > +Phy documentation is provided in the following places:
> > +Documentation/devicetree/bindings/phy/rockchip,dwc3-usb-phy.txt
> > +
> > +Example device nodes:
> > +
> > +	usbdrd3_0: usb@fe800000 {
> > +		compatible = "rockchip,rk3399-dwc3";
> > +		clocks = <&cru SCLK_USB3OTG0_REF>, <&cru SCLK_USB3OTG0_SUSPEND>,
> > +			 <&cru ACLK_USB3OTG0>, <&cru ACLK_USB3_GRF>;
> > +		clock-names = "ref_clk", "suspend_clk",
> > +			      "bus_clk_otg0", "grf_clk";
> > +		#address-cells = <2>;
> > +		#size-cells = <2>;
> > +		ranges;
> > +		status = "disabled";
> > +		usbdrd_dwc3_0: dwc3@fe800000 {
> > +			compatible = "snps,dwc3";
> > +			reg = <0x0 0xfe800000 0x0 0x100000>;
> > +			interrupts = <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>;
> > +			dr_mode = "otg";
> > +			status = "disabled";
> > +		};
> > +	};
> > --
> > 1.9.1