linux-kernel - Re: [PATCH 1/2] dt: bindings: add allwinner,otg-routed property for phy-sun4i-usb

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Message-ID: <4a1ab62a-4091-fd75-d753-fb30585dffa5@redhat.com>
Date:   Wed, 21 Sep 2016 10:10:14 +0300
From:   Hans de Goede <hdegoede@...hat.com>
To:     Icenowy Zheng <icenowy@...c.xyz>, Rob Herring <robh+dt@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Andre Przywara <andre.przywara@....com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Reinder de Haan <patchesrdh@...as.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] dt: bindings: add allwinner,otg-routed property for
 phy-sun4i-usb

Hi,

On 09/21/2016 10:04 AM, Icenowy Zheng wrote:
> On some newer Allwinner SoCs (H3 or A64), the PHY0 can be either routed to
> the MUSB controller (which is an OTG controller) or the OHCI/EHCI pair
> (which is a Host-only controller, but more stable and easy to implement).
>
> This property marks whether on a certain board which controller should be
> attached to the PHY.
>
> Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>

Erm, I think that the idea here is to dynamically switch the routing
based on the id-pin of the otg connector. IOW use the musb controller
for device mode, and the ehci/ohci proper for proper host support
when in host mode.

Regards,

Hans



> ---
>  Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
> index 287150d..5c11d57 100644
> --- a/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
> +++ b/Documentation/devicetree/bindings/phy/sun4i-usb-phy.txt
> @@ -36,6 +36,13 @@ Optional properties:
>  - usb1_vbus-supply : regulator phandle for controller usb1 vbus
>  - usb2_vbus-supply : regulator phandle for controller usb2 vbus
>
> +Optional properties for H3 or A64 SoCs:
> +- allwinner,otg-routed : USB0 (OTG) PHY is routed to OHCI/EHCI pair rather than
> +			 MUSB. (boolean, if this property is set, the OHCI/EHCI
> +			 controllers at PHY0 should be enabled and the MUSB
> +			 controller must *NOT* be enabled, and thus the PHY can
> +			 only work in host mode)
> +
>  Example:
>  	usbphy: phy@...1c13400 {
>  		#phy-cells = <1>;
>