linux-kernel - Re: [PATCH v4 2/3] usb: dwc3: dwc3-st: Add st-dwc3 devicetree bindings documentation

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Message-ID: <20140820180005.GU24500@saruman.home>
Date:	Wed, 20 Aug 2014 13:00:05 -0500
From:	Felipe Balbi <balbi@...com>
To:	Peter Griffin <peter.griffin@...aro.org>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <maxime.coquelin@...com>,
	<patrice.chotard@...com>, <srinivas.kandagatla@...il.com>,
	<devicetree@...r.kernel.org>, <balbi@...com>,
	<lee.jones@...aro.org>, <linux-usb@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <peppe.cavallaro@...com>
Subject: Re: [PATCH v4 2/3] usb: dwc3: dwc3-st: Add st-dwc3 devicetree
 bindings documentation

On Wed, Jul 30, 2014 at 04:28:10PM +0100, Peter Griffin wrote:
> This patch documents the device tree documentation required for
> the ST usb3 controller glue layer found in STiH407 devices.
> 
> Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@...com>
> Signed-off-by: Peter Griffin <peter.griffin@...aro.org>
> Acked-by: Lee Jones <lee.jones@...aro.org>
> ---
>  Documentation/devicetree/bindings/usb/dwc3-st.txt | 69 +++++++++++++++++++++++
>  1 file changed, 69 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/dwc3-st.txt
> 
> diff --git a/Documentation/devicetree/bindings/usb/dwc3-st.txt b/Documentation/devicetree/bindings/usb/dwc3-st.txt
> new file mode 100644
> index 0000000..de3fea3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/dwc3-st.txt
> @@ -0,0 +1,69 @@
> +ST DWC3 glue logic
> +
> +This file documents the parameters for the dwc3-st driver.
> +This driver controls the glue logic used to configure the dwc3 core on
> +STiH407 based platforms.
> +
> +Required properties:
> + - compatible	: must be "st,stih407-dwc3"
> + - reg		: glue logic base address and USB syscfg ctrl register offset
> + - reg-names	: should be "reg-glue" and "syscfg-reg"
> + - st,syscon	: should be phandle to system configuration node which
> +		  encompasses the glue registers
> + - resets	: list of phandle and reset specifier pairs. There should be two entries, one
> +		  for the powerdown and softreset lines of the usb3 IP
> + - reset-names	: list of reset signal names. Names should be "powerdown" and "softreset"
> +See: Documentation/devicetree/bindings/reset/st,sti-powerdown.txt
> +See: Documentation/devicetree/bindings/reset/reset.txt
> +
> + - #address-cells, #size-cells : should be '1' if the device has sub-nodes
> +                                 with 'reg' property
> +
> + - pinctl-names	: A pinctrl state named "default" must be defined
> +See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt
> +
> + - pinctrl-0	: Pin control group
> +See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt
> +
> + - ranges	: allows valid 1:1 translation between child's address space and
> +		  parent's address space
> +
> +Sub-nodes:
> +The dwc3 core should be added as subnode to ST DWC3 glue as shown in the
> +example below. The DT binding details of dwc3 can be found in:
> +Documentation/devicetree/bindings/usb/dwc3.txt
> +
> +NB: The dr_mode property described in [1] is NOT optional for this driver, as the default value
> +is "otg", which isn't supported by this SoC. Valid dr_mode values for dwc3-st are either "host"
> +or "device".
> +
> +[1] Documentation/devicetree/bindings/usb/generic.txt
> +
> +Example:
> +
> +st_dwc3: dwc3@...4000 {
> +	status		= "disabled";
> +	compatible	= "st,stih407-dwc3";
> +	reg		= <0x08f94000 0x1000>, <0x110 0x4>;
> +	reg-names	= "reg-glue", "syscfg-reg";
> +	st,syscfg	= <&syscfg_core>;
> +	resets		= <&powerdown STIH407_USB3_POWERDOWN>;
> +			  <&softreset STIH407_MIPHY2_SOFTRESET>;
> +	reset-names	= "powerdown",
> +			  "softreset";
> +	#address-cells	= <1>;
> +	#size-cells	= <1>;
> +	pinctrl-names	= "default";
> +	pinctrl-0	= <&pinctrl_usb3>;
> +	ranges;
> +
> +	dwc3: dwc3@...0000 {
> +		compatible	= "snps,dwc3";
> +		reg		= <0x09900000 0x100000>;
> +		interrupts	= <GIC_SPI 155 IRQ_TYPE_NONE>;
> +		dr_mode		= "host"
> +		usb-phy		= <&usb3_phy>;
> +		phy-names	= "usb2-phy";
> +		phys		= <&usb2_picophy2>;

why are you using different binding for usb2 and usb3 phys ? Why can't
you just:

	phys-names	= "usb2-phy", "usb3-phy";
	phys		= <&usb2_picophy2>, <&usb3_phy>;

??

-- 
balbi

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