linux-kernel - Re: [RFC PATCH v1 1/2] dt-bindings: usb: samsung,exynos-xhci: support Samsung Exynos xHCI Controller

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Date:   Mon, 5 Dec 2022 08:31:46 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jung Daehwan <dh10.jung@...sung.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Colin Ian King <colin.i.king@...il.com>,
        Artur Bujdoso <artur.bujdoso@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Tomer Maimon <tmaimon77@...il.com>,
        "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/SAMSUNG S3C, S5P AND EXYNOS ARM ARCHITECTURES" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/SAMSUNG S3C, S5P AND EXYNOS ARM ARCHITECTURES" 
        <linux-samsung-soc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>, sc.suh@...sung.com,
        taehyun.cho@...sung.com, jh0801.jung@...sung.com,
        eomji.oh@...sung.com
Subject: Re: [RFC PATCH v1 1/2] dt-bindings: usb: samsung,exynos-xhci: support
 Samsung Exynos xHCI Controller

On 05/12/2022 03:06, Jung Daehwan wrote:
> On Thu, Dec 01, 2022 at 09:59:06AM +0100, Krzysztof Kozlowski wrote:
>> On 01/12/2022 03:13, Daehwan Jung wrote:
>>> Add the Samsung Exynos xHCI Controller bindings with DT schema format.
>>>
>>> Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
>>> ---
>>>  .../bindings/usb/samsung,exynos-xhci.yaml     | 25 +++++++++++++++++++
>>>  1 file changed, 25 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/usb/samsung,exynos-xhci.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/usb/samsung,exynos-xhci.yaml b/Documentation/devicetree/bindings/usb/samsung,exynos-xhci.yaml
>>> new file mode 100644
>>> index 000000000000..c5dde53b6491
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/usb/samsung,exynos-xhci.yaml
>>> @@ -0,0 +1,25 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: https://protect2.fireeye.com/v1/url?k=7899b46f-19e45c17-78983f20-74fe485fffb1-728a1b33a5d009dd&q=1&e=bdc50247-e986-43da-a15e-03ac6c3a25e8&u=http%3A%2F%2Fdevicetree.org%2Fschemas%2Fusb%2Fsamsung%2Cexynos-xhci.yaml%23
>>> +$schema: https://protect2.fireeye.com/v1/url?k=ea1282f0-8b6f6a88-ea1309bf-74fe485fffb1-536f21757c62f28b&q=1&e=bdc50247-e986-43da-a15e-03ac6c3a25e8&u=http%3A%2F%2Fdevicetree.org%2Fmeta-schemas%2Fcore.yaml%23
>>> +
>>> +title: Samsung Exynos xHCI
>>> +
>>> +maintainers:
>>> +  - Daehwan Jung <dh10.jung@...sung.com>
>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: samsung,exynos-xhci
>>> +
>>> +required:
>>> +  - compatible
>>> +
>>> +additionalProperties: false
>>> +
>>
>> These do not look like complete bindings... What type of device has no
>> resources at all, just compatible?
>>
>> Best regards,
>> Krzysztof
>>
>>
> 
> It gets resources from dwc->xhci_resources as you can see
> dwc3_host_init(usb/dwc3/host.c). I think it doesn't need to get another resource.

You refer to driver, but we talk about hardware. Not driver. Your
hardware has no resources, so this does not look like complete binding.

Best regards,
Krzysztof