linux-kernel - Re: [PATCH 1/2] dt-bindings: phy: add bcm63xx-usbh bindings

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Message-Id: <7E21D795-8D20-4EB1-9758-D2B5BD389F1F@gmail.com>
Date:   Tue, 16 Jun 2020 20:10:47 +0200
From:   Álvaro Fernández Rojas <noltari@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     simon@...e.lp0.eu, Jonas Gorski <jonas.gorski@...il.com>,
        kishon@...com, vkoul@...nel.org, robh+dt@...nel.org,
        bcm-kernel-feedback-list@...adcom.com,
        Philipp Zabel <p.zabel@...gutronix.de>, krzk@...nel.org,
        gregkh@...uxfoundation.org, alcooperx@...il.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] dt-bindings: phy: add bcm63xx-usbh bindings

Hello Florian,

> El 16 jun 2020, a las 19:17, Florian Fainelli <f.fainelli@...il.com> escribió:
> 
> 
> 
> On 6/16/2020 1:34 AM, Álvaro Fernández Rojas wrote:
>> Document BCM63xx USBH PHY bindings.
>> 
>> Signed-off-by: Álvaro Fernández Rojas <noltari@...il.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
>> 
>> 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:
>> +  - Álvaro Fernández Rojas <noltari@...il.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
> 
> 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 = 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’m not really sure about how I should do this because there’s 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?

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

Best regards,
Álvaro.