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Message-ID: <ed97be2e-4a3d-4be6-9a57-5c77d5fffc9c@linaro.org>
Date: Sat, 17 Feb 2024 14:40:08 +0100
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Subject: Re: [PATCH RFC 1/4] dt-binding: phy: hisi-inno-usb2: convert to YAML
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To: Yang Xiwen <forbidden405@outlook.com>, Vinod Koul <vkoul@kernel.org>,
 Kishon Vijay Abraham I <kishon@kernel.org>, Rob Herring
 <robh+dt@kernel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>,
 Jiancheng Xue <xuejiancheng@hisilicon.com>,
 Pengcheng Li <lpc.li@hisilicon.com>, Shawn Guo <shawn.guo@linaro.org>
Cc: linux-phy@lists.infradead.org, devicetree@vger.kernel.org,
 linux-kernel@vger.kernel.org, Kishon Vijay Abraham I <kishon@ti.com>,
 David Yang <mmyangfl@gmail.com>
References: <20240216-inno-phy-v1-0-1ab912f0533f@outlook.com>
 <20240216-inno-phy-v1-1-1ab912f0533f@outlook.com>
 <63b3eff6-49eb-46f3-a6d9-878eddf6de53@linaro.org>
 <SEZPR06MB69596C83014B1A424F0B376996532@SEZPR06MB6959.apcprd06.prod.outlook.com>
From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <SEZPR06MB69596C83014B1A424F0B376996532@SEZPR06MB6959.apcprd06.prod.outlook.com>
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On 17/02/2024 14:14, Yang Xiwen wrote:
> On 2/17/2024 6:14 PM, Krzysztof Kozlowski wrote:
>> On 16/02/2024 16:21, Yang Xiwen via B4 Relay wrote:
>>> From: Yang Xiwen <forbidden405@outlook.com>
>>>
>>> Also rename to hisilicon,inno-usb2-phy.yaml and add this name to
>>> compatible lists.
>> Please use subject prefixes matching the subsystem. You can get them for
>> example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
>> your patch is touching.
>>
>>> Signed-off-by: Yang Xiwen <forbidden405@outlook.com>
>>> ---
>>>   .../bindings/phy/hisilicon,inno-usb2-phy.yaml      | 115 +++++++++++++++++++++
>>>   .../devicetree/bindings/phy/phy-hisi-inno-usb2.txt |  71 -------------
>>>   2 files changed, 115 insertions(+), 71 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/phy/hisilicon,inno-usb2-phy.yaml b/Documentation/devicetree/bindings/phy/hisilicon,inno-usb2-phy.yaml
>>> new file mode 100644
>>> index 000000000000..73256eee10f9
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/phy/hisilicon,inno-usb2-phy.yaml
>>> @@ -0,0 +1,115 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/phy/hisilicon,inno-usb2-phy.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: HiSilicon HiSTB SoCs INNO USB2 PHY device
>>> +
>>> +maintainers:
>>> +  - Yang Xiwen <forbidden405@outlook.com>
>>> +
>>> +properties:
>>> +  compatible:
>>> +    minItems: 1
>> No, why? Compatibles must be fixed/constrained.
> Hi3798CV200 has only the first compatible listed in its device tree. But 
> you are right i can add it to hi3798mv200.dtsi so that `minItems` can be 
> removed
>>
>>> +    items:
>>> +      - enum:
>>> +          - hisilicon,hi3798cv200-usb2-phy
>>> +          - hisilicon,hi3798mv100-usb2-phy
>> This wasn't here before. Not explained in commit msg.
>>
>>> +      - const: hisilicon,inno-usb2-phy
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +    description: |
>> Do not need '|' unless you need to preserve formatting.
>>
>>> +      Should be the address space for PHY configuration register in peripheral
>>> +      controller, e.g. PERI_USB0 for USB 2.0 PHY01 on Hi3798CV200 SoC.
>>> +      Or direct MMIO address space.
>>> +
>>> +  '#address-cells':
>>> +    const: 1
>>> +
>>> +  '#size-cells':
>>> +    const: 0
>>> +
>>> +  clocks:
>>> +    maxItems: 1
>>> +    description: reference clock
>>> +
>>> +  resets:
>>> +    maxItems: 1
>>> +
>>> +patternProperties:
>>> +  'phy@[0-9a-f]+':
>>> +    type: object
>>> +    additionalProperties: false
>>> +    description: individual ports provided by INNO PHY
>>> +
>>> +    properties:
>>> +      reg:
>>> +        maxItems: 1
>>> +
>>> +      '#phy-cells':
>>> +        const: 0
>>> +
>>> +      resets:
>>> +        maxItems: 1
>>> +
>>> +    required: [reg, '#phy-cells', resets]
>> One item per line. Look at other bindings or example-schema.
>>
>>> +
>>> +required:
>>> +  - compatible
>>> +  - clocks
>>> +  - reg
>>> +  - '#address-cells'
>>> +  - '#size-cells'
>>> +  - resets
>>> +
>>> +additionalProperties: false
>>> +
>>> +examples:
>>> +  - |
>>> +    #include <dt-bindings/clock/histb-clock.h>
>>> +
>>> +    peripheral-controller@8a20000 {
>>> +        compatible = "hisilicon,hi3798cv200-perictrl", "syscon", "simple-mfd";
>>> +        reg = <0x8a20000 0x1000>;
>>> +        #address-cells = <1>;
>>> +        #size-cells = <1>;
>>> +        ranges = <0x0 0x8a20000 0x1000>;
>> Drop the node, not related to this binding. If this binding is supposed
>> to be part of other device in case of MFD devices or some tightly
>> coupled ones, then could be included in the example there.
>>
>>> +
>>> +        usb2-phy@120 {
>>> +            compatible = "hisilicon,hi3798cv200-usb2-phy";
>>> +            reg = <0x120 0x4>;
>>> +            clocks = <&crg HISTB_USB2_PHY1_REF_CLK>;
>>> +            resets = <&crg 0xbc 4>;
>>> +            #address-cells = <1>;
>>> +            #size-cells = <0>;
>>> +
>>> +            phy@0 {
>>> +                reg = <0>;
>>> +                #phy-cells = <0>;
>>> +                resets = <&crg 0xbc 8>;
>>> +            };
>>> +
>>> +            phy@1 {
>>> +                reg = <1>;
>>> +                #phy-cells = <0>;
>>> +                resets = <&crg 0xbc 9>;
>>> +            };
>>> +        };
>>> +
>>> +        usb2-phy@124 {
>>> +            compatible = "hisilicon,hi3798cv200-usb2-phy";
>> You can keep only one example, because they are basically the same.
> 
> It is listed here just because cv200 (and the upcoming mv200) actually 
> has two INNO phys in the SoC. And coincidently for both SoCs, one with 
> two ports is wired to USB2 controller(EHCI &OHCI), while the other one 
> with only one port is wired to DWC3 controller. The example here is 
> borrowed directly from hi3798cv200.dtsi.
> 

I see the differences and one difference means they are basically the same.

Best regards,
Krzysztof