linux-kernel - Re: [PATCH v2,3/5] dt-bindings: mtu3: add devicetree bindings

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Message-ID: <5751874C.9070100@gmail.com>
Date:	Fri, 3 Jun 2016 15:34:04 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Chunfeng Yun <chunfeng.yun@...iatek.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Pawel Moll <pawel.moll@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2,3/5] dt-bindings: mtu3: add devicetree bindings



On 31/05/16 07:52, Chunfeng Yun wrote:
> add a DT binding doc for MediaTek USB3 DRD driver
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> ---
>   Documentation/devicetree/bindings/usb/mtu3.txt |   85 ++++++++++++++++++++++++
>   1 file changed, 85 insertions(+)
>   create mode 100644 Documentation/devicetree/bindings/usb/mtu3.txt
>
> diff --git a/Documentation/devicetree/bindings/usb/mtu3.txt b/Documentation/devicetree/bindings/usb/mtu3.txt
> new file mode 100644
> index 0000000..571ae8b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/mtu3.txt

The file should be called mt8173-mtu3.txt to be in line with mt8173-xhci.txt

> @@ -0,0 +1,85 @@
> +The device node for Mediatek USB3.0 DRD controller
> +
> +Required properties:
> + - compatible : should be "mediatek,mt8173-mtu3"
> + - reg : specifies physical base address and size of the registers
> + - reg-names: should be "mac" for device IP and "ippc" for IP port control
> + - interrupts : interrupt used by the device IP
> + - power-domains : a phandle to USB power domain node to control USB's
> +	mtcmos
> + - vusb33-supply : regulator of USB avdd3.3v
> + - clocks : a list of phandle + clock-specifier pairs, one for each
> +	entry in clock-names
> + - clock-names : must contain "sys_ck" for clock of controller;
> +	"wakeup_deb_p0" and "wakeup_deb_p1" are optional, they are
> +	depends on "mediatek,enable-wakeup"
> + - phys : a list of phandle + phy specifier pairs
> + - dr_mode : should be one of "host", "peripheral" or "otg",
> +	refer to usb/generic.txt
> +
> +Optional properties:
> + - #address-cells, #size-cells : should be '2' if the device has sub-nodes
> +	with 'reg' property
> + - ranges : allows valid 1:1 translation between child's address space and
> +	parent's address space
> + - extcon : external connector for vbus and idpin changes detection, needed
> +	when supports dual-role mode.
> + - vbus-supply : reference to the VBUS regulator, needed when supports
> +	dual-role mode.
> + - pinctl-names : a pinctrl state named "default" must be defined,
> +	"id_float" and "id_ground" are optinal which depends on
> +	"mediatek,enable-manual-drd"

So pinctrl is optional, but if you put it, you need at least "default"?

Apart from that, DT maintainers prefer to have the binding patches at 
the beginning of a series, so it's easier for them to not oversee any.

Regards,
Matthias

> + - pinctrl-0 : pin control group
> +	See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt
> +
> + - maximum-speed : valid arguments are "super-speed", "high-speed" and
> +	"full-speed"; refer to usb/generic.txt
> + - enable-manual-drd : supports manual dual-role switch via sysfs; only used
> +	when receptacle is TYPE-A and also wants to support dual-role mode.
> + - mediatek,enable-wakeup : supports ip sleep wakeup used by host mode
> + - mediatek,syscon-wakeup : phandle to syscon used to access USB wakeup
> +	control register, it depends on "mediatek,enable-wakeup".
> +
> +Sub-nodes:
> +The xhci should be added as subnode to mtu3 as shown in the following example
> +if host mode is enabled. The DT binding details of xhci can be found in:
> +Documentation/devicetree/bindings/usb/mt8173-xhci.txt
> +
> +Example:
> +ssusb: usb@...71000 {
> +	compatible = "mediatek,mt8173-mtu3";
> +	reg = <0 0x11271000 0 0x3000>,
> +	      <0 0x11280700 0 0x0100>;
> +	reg-names = "mac", "ippc";
> +	interrupts = <GIC_SPI 64 IRQ_TYPE_LEVEL_LOW>;
> +	phys = <&phy_port0 PHY_TYPE_USB3>,
> +	       <&phy_port1 PHY_TYPE_USB2>;
> +	power-domains = <&scpsys MT8173_POWER_DOMAIN_USB>;
> +	clocks = <&topckgen CLK_TOP_USB30_SEL>,
> +		 <&pericfg CLK_PERI_USB0>,
> +		 <&pericfg CLK_PERI_USB1>;
> +	clock-names = "sys_ck",
> +		      "wakeup_deb_p0",
> +		      "wakeup_deb_p1";
> +	vusb33-supply = <&mt6397_vusb_reg>;
> +	vbus-supply = <&usb_p0_vbus>;
> +	extcon = <&extcon_usb>;
> +	dr_mode = "otg";
> +	mediatek,enable-wakeup;
> +	mediatek,syscon-wakeup = <&pericfg>;
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +	ranges;
> +	status = "disabled";
> +
> +	usb_host: xhci@...70000 {
> +		compatible = "mediatek,mt8173-xhci";
> +		reg = <0 0x11270000 0 0x1000>;
> +		interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_LOW>;
> +		power-domains = <&scpsys MT8173_POWER_DOMAIN_USB>;
> +		clocks = <&topckgen CLK_TOP_USB30_SEL>;
> +		clock-names = "sys_ck";
> +		vusb33-supply = <&mt6397_vusb_reg>;
> +		status = "disabled";
> +	};
> +};
>