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Subject: Re: [PATCH 1/2] dt-bindings: phy: add bcm63xx-usbh bindings
From:   =?utf-8?Q?=C3=81lvaro_Fern=C3=A1ndez_Rojas?= <noltari@gmail.com>
In-Reply-To: <2cc00ff1-f411-1c2d-d2ce-4cc0bfc2ccb5@gmail.com>
Date:   Tue, 16 Jun 2020 20:10:47 +0200
Cc:     simon@fire.lp0.eu, Jonas Gorski <jonas.gorski@gmail.com>,
        kishon@ti.com, vkoul@kernel.org, robh+dt@kernel.org,
        bcm-kernel-feedback-list@broadcom.com,
        Philipp Zabel <p.zabel@pengutronix.de>, krzk@kernel.org,
        gregkh@linuxfoundation.org, alcooperx@gmail.com,
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        linux-arm-kernel@lists.infradead.org
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To:     Florian Fainelli <f.fainelli@gmail.com>
Sender: linux-kernel-owner@vger.kernel.org
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Hello Florian,

> El 16 jun 2020, a las 19:17, Florian Fainelli <f.fainelli@gmail.com> =
escribi=C3=B3:
>=20
>=20
>=20
> On 6/16/2020 1:34 AM, =C3=81lvaro Fern=C3=A1ndez Rojas wrote:
>> Document BCM63xx USBH PHY bindings.
>>=20
>> Signed-off-by: =C3=81lvaro Fern=C3=A1ndez Rojas <noltari@gmail.com>
>> ---
>> .../bindings/phy/brcm,bcm63xx-usbh-phy.yaml   | 72 =
+++++++++++++++++++
>> 1 file changed, 72 insertions(+)
>> create mode 100644 =
Documentation/devicetree/bindings/phy/brcm,bcm63xx-usbh-phy.yaml
>>=20
>> diff --git =
a/Documentation/devicetree/bindings/phy/brcm,bcm63xx-usbh-phy.yaml =
b/Documentation/devicetree/bindings/phy/brcm,bcm63xx-usbh-phy.yaml
>> new file mode 100644
>> index 000000000000..3e7c97799b91
>> --- /dev/null
>> +++ =
b/Documentation/devicetree/bindings/phy/brcm,bcm63xx-usbh-phy.yaml
>> @@ -0,0 +1,72 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: "http://devicetree.org/schemas/phy/brcm,bcm63xx-usbh-phy.yaml#"
>> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
>> +
>> +title: BCM63xx USBH PHY
>> +
>> +maintainers:
>> +  - =C3=81lvaro Fern=C3=A1ndez Rojas <noltari@gmail.com>
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - brcm,bcm6318-usbh-phy
>> +      - brcm,bcm6328-usbh-phy
>> +      - brcm,bcm6358-usbh-phy
>> +      - brcm,bcm6362-usbh-phy
>> +      - brcm,bcm6368-usbh-phy
>> +      - brcm,bcm63268-usbh-phy
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 2
>> +
>> +  clock-names:
>> +    items:
>> +      - const: usbh
>> +      - const: usb_ref
>> +
>> +  resets:
>> +    maxItems: 1
>> +
>> +  "#phy-cells":
>> +    const: 0
>=20
> On 6328, the same register space allows the controlling of the USB PHY
> in either host or device mode, so I believe you would need to add a
> #phy-cells =3D 1 in order to distinguish the consumer (host versus =
device)
> if we get to the point where drivers/usb/gadget/udc/bcm63xx_udc.c
> becomes DT aware.

I=E2=80=99m not really sure about how I should do this because there=E2=80=
=99s no definition for device phy mode in dt-bindings/phy/phy.h:
=
https://github.com/torvalds/linux/blob/master/include/dt-bindings/phy/phy.=
h#L13

Which value should I use for device mode and which one for host?
Should I support both modes at the same time or are they exclusive?

>=20
> Other than that, this looks good to me!
> --=20
> Florian

Best regards,
=C3=81lvaro.