linux-kernel - Re: [PATCH 1/3] Documentation: DT: Add Cygnus usb phy binding

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Date:   Thu, 26 Oct 2017 22:39:43 -0500
From:   Rob Herring <robh@...nel.org>
To:     Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Russell King <linux@...linux.org.uk>,
        Scott Branden <sbranden@...adcom.com>,
        Ray Jui <rjui@...adcom.com>,
        Srinath Mannam <srinath.mannam@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Raviteja Garimella <raviteja.garimella@...adcom.com>,
        Rafal Milecki <rafal@...ecki.pl>,
        Arnd Bergmann <arnd@...db.de>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH 1/3] Documentation: DT: Add Cygnus usb phy binding

On Tue, Oct 24, 2017 at 10:07:00AM +0530, Raveendra Padasalagi wrote:
> Add devicetree binding document for broadcom's
> Cygnus SoC specific usb phy controller driver.

"dt-bindings: phy: ..." for the subject please.

> 
> Signed-off-by: Raveendra Padasalagi <raveendra.padasalagi@...adcom.com>
> ---
>  .../bindings/phy/brcm,cygnus-usb-phy.txt           | 101 +++++++++++++++++++++
>  1 file changed, 101 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt
> 
> diff --git a/Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt b/Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt
> new file mode 100644
> index 0000000..2d99fea
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/brcm,cygnus-usb-phy.txt
> @@ -0,0 +1,101 @@
> +BROADCOM CYGNUS USB PHY
> +
> +Required Properties:
> +- compatible:  brcm,cygnus-usb-phy
> +- reg : the register start address and length for crmu_usbphy_aon_ctrl,
> +  cdru usb phy control and reset registers, usb host idm registers,
> +  usb device idm registers.

Make this list 1 per line.

> +- reg-names: a list of the names corresponding to the previous register
> +  ranges. Should contain "crmu-usbphy-aon-ctrl", "cdru-usbphy",
> +  "usb2h-idm", "usb2d-idm".
> +- address-cells: should be 1
> +- size-cells: should be 0
> +
> +Sub-nodes:
> +  Each port's PHY should be represented as a sub-node.
> +
> +Sub-nodes required properties:
> +- reg: the PHY number
> +- #phy-cells must be 1
> +  The node that uses the phy must provide 1 integer argument specifying
> +  port number.

Either you need to move #phy-cells up a level or #phy-cells should be 0.

> +
> +Optional Properties:
> +- vbus-p#-supply : The regulator for vbus out control for the host
> +  functionality enabled ports.
> +- vbus-gpios: vbus gpio binding

Are you using these or extcon?

Don't use extcon. It needs to be redesigned and I don't want to see new 
users.

> +  This is mandatory for port 2, as port 2 is used as dual role phy.
> +  Based on the vbus and id values device or host role is determined
> +  for phy 2.
> +
> +- extcon: extcon phandle
> +  This is mandatory for port 2,  as port 2 is used as dual role phy.
> +  extcon should be phandle to external usb gpio module which provide
> +  device or host role notifications based on the ID and VBUS gpio's state.
> +
> +
> +Refer to phy/phy-bindings.txt for the generic PHY binding properties
> +
> +NOTE: port 0 and port 1 are host only and port 2 is dual role port.
> +
> +Example of phy :
> +	usbphy: phy@...1c028 {

usb-phy@...c028

> +		compatible = "brcm,cygnus-usb-phy";
> +		reg = <0x0301c028 0x4>,
> +		      <0x0301d1b4 0x5c>,
> +		      <0x18115000 0xa00>,
> +		      <0x18111000 0xa00>;
> +		reg-names = "crmu-usbphy-aon-ctrl", "cdru-usbphy",
> +			    "usb2h-idm", "usb2d-idm";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		usbphy0: usb-phy@0 {
> +			reg = <0>;
> +			#phy-cells = <1>;
> +		};
> +
> +		usbphy1: usb-phy@1 {
> +			reg = <1>;
> +			#phy-cells = <1>;
> +		};
> +
> +		usbphy2: usb-phy@2 {
> +			reg = <2>;
> +			#phy-cells = <1>;
> +			extcon = <&extcon_usb>;
> +		};
> +	};
> +
> +	extcon_usb: extcon_usb {
> +		compatible = "linux,extcon-usb-gpio";
> +		vbus-gpio = <&gpio_asiu 121 0>;
> +		id-gpio = <&gpio_asiu 122 0>;
> +		status = "okay";
> +	};
> +
> +
> +Example of node using the phy:
> +
> +	/* This nodes declares all three ports, port 0
> +	and port 1 are host and port 2 is device */
> +
> +	ehci0: usb@...48000 {
> +		compatible = "generic-ehci";
> +		reg = <0x18048000 0x100>;
> +		interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>;
> +		phys = <&usbphy0 0 &usbphy1 1 &usbphy2 2>;
> +		phy-names = "usbp0","usbp1","usbp2";
> +		status = "okay";
> +	};
> +
> +	/* This node declares port 2 phy
> +	and configures it for device */
> +
> +	usbd_udc_dwc1: usbd_udc_dwc@...4c000 {

usb@...

> +		compatible = "iproc-udc";
> +		reg = <0x1804c000 0x2000>;
> +		interrupts = <GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>;
> +		phys = <&usbphy2 2>;
> +		phy-names = "usbdrd";
> +	};
> -- 
> 1.9.1
>