From: Rob Herring <robh@kernel.org>
To: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Hans de Goede <hdegoede@redhat.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Linus Walleij <linus.walleij@linaro.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
Biju Das <biju.das@bp.renesas.com>,
Badhri Jagan Sridharan <badhri@google.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
linux-mediatek@lists.infradead.org,
Min Guo <min.guo@mediatek.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Adam Thomson <Adam.Thomson.Opensource@diasemi.com>,
linux-arm-kernel@lists.infradead.org, Li Jun <jun.li@nxp.com>
Subject: Re: [PATCH v5 2/6] dt-bindings: usb: add binding for Type-B GPIO connector driver
Date: Tue, 14 May 2019 13:12:04 -0500 [thread overview]
Message-ID: <20190514181204.GA13949@bogus> (raw)
In-Reply-To: <1557823643-8616-3-git-send-email-chunfeng.yun@mediatek.com>
On Tue, May 14, 2019 at 04:47:19PM +0800, Chunfeng Yun wrote:
> It's used to support dual role switch via GPIO when use Type-B
> receptacle, typically the USB ID pin is connected to an input
> GPIO pin
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> ---
> v5 changes:
> 1. treat type-B connector as child device of USB controller's, but not
> as a separate virtual device, suggested by Rob
> 2. put connector's port node under connector node, suggested by Rob
>
> v4 no changes
>
> v3 changes:
> 1. treat type-B connector as a virtual device, but not child device of
> USB controller's
>
> v2 changes:
> 1. new patch to make binding clear suggested by Hans
> ---
> .../bindings/usb/typeb-conn-gpio.txt | 42 +++++++++++++++++++
> 1 file changed, 42 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/usb/typeb-conn-gpio.txt
>
> diff --git a/Documentation/devicetree/bindings/usb/typeb-conn-gpio.txt b/Documentation/devicetree/bindings/usb/typeb-conn-gpio.txt
> new file mode 100644
> index 000000000000..20dd3499a348
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/typeb-conn-gpio.txt
> @@ -0,0 +1,42 @@
> +USB Type-B GPIO Connector
> +
> +This is used to switch dual role mode from the USB ID pin connected to
> +an input GPIO pin.
> +
> +Required properties:
> +- compatible : should include "linux,typeb-conn-gpio" and "usb-b-connector".
I don't think we need "linux,typeb-conn-gpio". A driver can decide to
handle GPIO lines if they present or we assume the parent device handles
ID and/or Vbus if they are not present.
> +- id-gpios, vbus-gpios : either one of them must be present, and both
> + can be present as well.
Please clarify that vbus-gpios is an input to sense Vbus presence as an
output it should be modelled as a regulator only.
These should be added to usb-connector.txt.
The result of all this is you don't need this file. Just additions to
usb-connector.txt.
> +- vbus-supply : can be present if needed when supports dual role mode or
> + host mode.
> + see connector/usb-connector.txt
> +
> +Sub-nodes:
> +- port : should be present.
> + see graph.txt
> +
> +Example:
> +
> +&mtu3 {
> + status = "okay";
Don't show status in examples.
> +
> + connector {
> + compatible = "linux,typeb-conn-gpio", "usb-b-connector";
> + label = "micro-USB";
> + type = "micro";
> + id-gpios = <&pio 12 GPIO_ACTIVE_HIGH>;
> + vbus-supply = <&usb_p0_vbus>;
> +
> + port {
> + bconn_ep: endpoint@0 {
> + remote-endpoint = <&usb_role_sw>;
> + };
> + };
> + };
> +
> + port {
> + usb_role_sw: endpoint@0 {
> + remote-endpoint = <&bconn_ep>;
> + };
> + };
When the host controller is the parent of the connector, you don't need
the graph unless you're describing the alternate modes in Type-C.
> +};
> --
> 2.21.0
>
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next prev parent reply other threads:[~2019-05-14 18:12 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-14 8:47 [v5 PATCH 0/6] add USB Type-B GPIO connector driver Chunfeng Yun
2019-05-14 8:47 ` [PATCH v5 1/6] dt-bindings: connector: add optional properties for Type-B Chunfeng Yun
2019-05-14 8:47 ` [PATCH v5 2/6] dt-bindings: usb: add binding for Type-B GPIO connector driver Chunfeng Yun
2019-05-14 18:12 ` Rob Herring [this message]
2019-05-15 9:36 ` Chunfeng Yun
2019-05-14 8:47 ` [PATCH v5 3/6] dt-bindings: usb: mtu3: add properties about USB Role Switch Chunfeng Yun
2019-05-14 18:17 ` Rob Herring
2019-05-14 8:47 ` [PATCH v5 4/6] usb: roles: add API to get usb_role_switch by node Chunfeng Yun
2019-05-17 10:37 ` Heikki Krogerus
2019-05-17 13:05 ` Heikki Krogerus
2019-05-20 2:39 ` Chunfeng Yun
2019-05-20 8:03 ` Heikki Krogerus
2019-05-20 8:06 ` Biju Das
2019-05-20 8:36 ` Heikki Krogerus
2019-05-20 9:45 ` Biju Das
2019-05-21 7:35 ` Chunfeng Yun
2019-05-21 10:33 ` Heikki Krogerus
2019-05-22 3:37 ` Chunfeng Yun
2019-05-21 9:58 ` Heikki Krogerus
2019-05-22 8:05 ` Biju Das
2019-05-22 9:30 ` Chunfeng Yun
2019-05-22 10:55 ` Biju Das
2019-05-22 14:26 ` Heikki Krogerus
2019-05-22 14:57 ` Biju Das
2019-05-24 12:44 ` Heikki Krogerus
2019-05-27 3:08 ` Chunfeng Yun
2019-05-28 6:52 ` Biju Das
2019-05-28 9:23 ` Chunfeng Yun
2019-05-23 10:16 ` Chunfeng Yun
2019-05-24 11:40 ` Heikki Krogerus
2019-05-27 3:07 ` Chunfeng Yun
2019-05-27 10:45 ` Heikki Krogerus
2019-05-14 8:47 ` [PATCH v5 5/6] usb: roles: add USB Type-B GPIO connector driver Chunfeng Yun
2019-05-20 8:31 ` Heikki Krogerus
2019-05-21 7:44 ` Chunfeng Yun
2019-05-14 8:47 ` [PATCH v5 6/6] usb: mtu3: register a USB Role Switch for dual role mode Chunfeng Yun
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