linux-kernel - Re: [RESEND PATCH 12/19] dt-bindings: Add bindings for USB phy on Allwinner A100

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Message-ID: <a52f7350-b7b5-290c-c43a-020fecd58874@arm.com>
Date:   Sat, 28 Nov 2020 20:18:16 +0000
From:   André Przywara <andre.przywara@....com>
To:     Rob Herring <robh@...nel.org>, Frank Lee <frank@...winnertech.com>
Cc:     devicetree@...r.kernel.org, tiny.windzz@...il.com,
        linux-kernel@...r.kernel.org, Maxime Ripard <mripard@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        linux-arm-kernel@...ts.infradead.org,
        Jernej Skrabec <jernej.skrabec@...l.net>
Subject: Re: [RESEND PATCH 12/19] dt-bindings: Add bindings for USB phy on
 Allwinner A100

On 11/11/2020 22:50, Rob Herring wrote:

Hi,

> On Tue, Nov 10, 2020 at 02:39:42PM +0800, Frank Lee wrote:
>> From: Yangtao Li <frank@...winnertech.com>
>>
>> Add a device tree binding for the A100's USB PHY.

Not your fault, Yangto, but why do we actually have a separate binding
document per SoC, when the differences between the PHYs are so minimal
that we get away with some flags in the compatible match, in one driver
file?

For a start this file is basically identical to the A64 one (apart from
the example), so can you just add the A100 compatible string to that
one, instead?

Cheers,
Andre

>>
>> Signed-off-by: Yangtao Li <frank@...winnertech.com>
>> ---
>>  .../phy/allwinner,sun50i-a100-usb-phy.yaml    | 105 ++++++++++++++++++
>>  1 file changed, 105 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/phy/allwinner,sun50i-a100-usb-phy.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/phy/allwinner,sun50i-a100-usb-phy.yaml b/Documentation/devicetree/bindings/phy/allwinner,sun50i-a100-usb-phy.yaml
>> new file mode 100644
>> index 000000000000..cc9bbebe2bd7
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/phy/allwinner,sun50i-a100-usb-phy.yaml
>> @@ -0,0 +1,105 @@
>> +# SPDX-License-Identifier: GPL-2.0
> 
> Dual license new bindings. checkpatch.pl will tell you which ones.
> 
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/phy/allwinner,sun50i-a100-usb-phy.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Allwinner A100 USB PHY Device Tree Bindings
>> +
>> +maintainers:
>> +  - Yangtao Li <tiny.windzz@...il.com>
>> +
>> +properties:
>> +  "#phy-cells":
>> +    const: 1
>> +
>> +  compatible:
>> +    const: allwinner,sun50i-a100-usb-phy
>> +
>> +  reg:
>> +    items:
>> +      - description: PHY Control registers
>> +      - description: PHY PMU0 registers
>> +      - description: PHY PMU1 registers
>> +
>> +  reg-names:
>> +    items:
>> +      - const: phy_ctrl
>> +      - const: pmu0
>> +      - const: pmu1
>> +
>> +  clocks:
>> +    items:
>> +      - description: USB OTG PHY bus clock
>> +      - description: USB Host 0 PHY bus clock
>> +
>> +  clock-names:
>> +    items:
>> +      - const: usb0_phy
>> +      - const: usb1_phy
>> +
>> +  resets:
>> +    items:
>> +      - description: USB OTG reset
>> +      - description: USB Host 1 Controller reset
>> +
>> +  reset-names:
>> +    items:
>> +      - const: usb0_reset
>> +      - const: usb1_reset
>> +
>> +  usb0_id_det-gpios:
>> +    description: GPIO to the USB OTG ID pin
> 
> Needs 'maxItems: 1'
> 
>> +
>> +  usb0_vbus_det-gpios:
>> +    description: GPIO to the USB OTG VBUS detect pin
>> +
>> +  usb0_vbus_power-supply:
>> +    description: Power supply to detect the USB OTG VBUS
>> +
>> +  usb0_vbus-supply:
>> +    description: Regulator controlling USB OTG VBUS
>> +
>> +  usb1_vbus-supply:
>> +    description: Regulator controlling USB1 Host controller
> 
> Are ID and VBus actually connected to the phy h/w? Really, all this 
> should be in a USB connector node for which we have bindings.
> 
>> +
>> +required:
>> +  - "#phy-cells"
>> +  - compatible
>> +  - clocks
>> +  - clock-names
>> +  - reg
>> +  - reg-names
>> +  - resets
>> +  - reset-names
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/gpio/gpio.h>
>> +    #include <dt-bindings/clock/sun50i-a100-ccu.h>
>> +    #include <dt-bindings/reset/sun50i-a100-ccu.h>
>> +
>> +    phy@...0400 {
>> +        #phy-cells = <1>;
>> +        compatible = "allwinner,sun50i-a100-usb-phy";
>> +        reg = <0x05100400 0x14>,
>> +              <0x05101800 0x4>,
>> +              <0x05200800 0x4>;
>> +        reg-names = "phy_ctrl",
>> +                    "pmu0",
>> +                    "pmu1";
>> +        clocks = <&ccu CLK_USB_PHY0>,
>> +                 <&ccu CLK_USB_PHY1>;
>> +        clock-names = "usb0_phy",
>> +                      "usb1_phy";
>> +        resets = <&ccu RST_USB_PHY0>,
>> +                 <&ccu RST_USB_PHY1>;
>> +        reset-names = "usb0_reset",
>> +                      "usb1_reset";
>> +        usb0_id_det-gpios = <&pio 7 10 GPIO_ACTIVE_HIGH>; /* PH10 */
>> +        usb0_vbus_power-supply = <&usb_power_supply>;
>> +        usb0_vbus-supply = <&reg_drivevbus>;
>> +        usb1_vbus-supply = <&reg_usb1_vbus>;
>> +    };
>> -- 
>> 2.28.0
>>
> 
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