linux-kernel - Re: [PATCH v5 1/6] dt-bindings: usb: musb: Add support for MediaTek musb controller

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Date:   Fri, 22 Feb 2019 10:49:23 -0600
From:   Rob Herring <robh@...nel.org>
To:     min.guo@...iatek.com
Cc:     Bin Liu <b-liu@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Alan Stern <stern@...land.harvard.edu>,
        chunfeng.yun@...iatek.com, 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, tony@...mide.com,
        hdegoede@...hat.com
Subject: Re: [PATCH v5 1/6] dt-bindings: usb: musb: Add support for MediaTek
 musb controller

On Tue, Feb 19, 2019 at 03:36:30PM +0800, min.guo@...iatek.com wrote:
> From: Min Guo <min.guo@...iatek.com>
> 
> This adds support for MediaTek musb controller in
> host, peripheral and otg mode.
> 
> Signed-off-by: Min Guo <min.guo@...iatek.com>
> ---
> changes in v5:
> suggested by Rob:
> 1. Modify compatible as 
> - compatible : should be one of:
>                "mediatek,mt-2701"
>                ...
>                followed by "mediatek,mtk-musb"
> 2. Add usb connector child node
> 
> changes in v4:
> suggested by Sergei:
> 1. String alignment
> 
> changes in v3:
> 1. no changes
> 
> changes in v2:
> suggested by Bin:
> 1. Modify DRC to DRD
> suggested by Rob:
> 2. Drop the "<soc-model>-musb" in compatible
> 3. Remove phy-names
> 4. Add space after comma in clock-names
> ---
>  .../devicetree/bindings/usb/mediatek,musb.txt      | 54 ++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/mediatek,musb.txt
> 
> diff --git a/Documentation/devicetree/bindings/usb/mediatek,musb.txt b/Documentation/devicetree/bindings/usb/mediatek,musb.txt
> new file mode 100644
> index 0000000..0632e6e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/mediatek,musb.txt
> @@ -0,0 +1,54 @@
> +MediaTek musb DRD/OTG controller
> +-------------------------------------------
> +
> +Required properties:
> + - compatible      : should be one of:
> +                     "mediatek,mt-2701"

That looks like a top-level SoC compatible and doesn't match the 
example.

> +                     ...
> +                     followed by "mediatek,mtk-musb"
> + - reg             : specifies physical base address and size of
> +                     the registers
> + - interrupts      : interrupt used by musb controller
> + - interrupt-names : must be "mc"

Not much point in a name when there is only 1.

> + - phys            : PHY specifier for the OTG phy
> + - dr_mode         : should be one of "host", "peripheral" or "otg",
> +                     refer to usb/generic.txt
> + - clocks          : a list of phandle + clock-specifier pairs, one for
> +                     each entry in clock-names
> + - clock-names     : must contain "main", "mcu", "univpll"
> +                     for clocks of controller
> +
> +Optional properties:
> + - power-domains   : a phandle to USB power domain node to control USB's
> +                     MTCMOS
> +
> +Required child nodes:
> + usb connector node as defined in bindings/connector/usb-connector.txt
> + - extcon          : for VBUS and ID pin changes detection, needed when
> +                     supports dual-role mode
> + - vbus-supply     : reference to the VBUS regulator, needed when supports
> +                     dual-role mode
> +
> +Example:
> +
> +usb2: usb@...00000 {
> +	compatible = "mediatek,mt2701-musb",
> +		     "mediatek,mtk-musb";
> +	reg = <0 0x11200000 0 0x1000>;
> +	interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_LOW>;
> +	interrupt-names = "mc";
> +	phys = <&u2port2 PHY_TYPE_USB2>;
> +	dr_mode = "otg";
> +	clocks = <&pericfg CLK_PERI_USB0>,
> +		 <&pericfg CLK_PERI_USB0_MCU>,
> +		 <&pericfg CLK_PERI_USB_SLV>;
> +	clock-names = "main","mcu","univpll";
> +	power-domains = <&scpsys MT2701_POWER_DOMAIN_IFR_MSC>;
> +	usb_con: connector{
> +		compatible = "usb-b-connector";
> +		label = "micro-USB";
> +		type = "micro";
> +		extcon = <&extcon_usb>;

The connector node should replace 'extcon'. Add what you need here 
directly (e.g. id-gpios). What you add needs to be defined in 
usb-connector.txt.

> +		vbus-supply = <&usb_vbus>;
> +	};
> +};
> -- 
> 1.9.1
>