linux-kernel - Re: [PATCH RFC v3 3/6] dt-bindings: phy: cp110-utmi-phy: add compatible string for armada-38x

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Message-ID: <53c3dbc6-5d14-455f-8c3d-6a7293068ed9@solid-run.com>
Date: Mon, 22 Jul 2024 15:31:29 +0000
From: Josua Mayer <josua@...id-run.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>, Andrew Lunn <andrew@...n.ch>,
	Gregory Clement <gregory.clement@...tlin.com>, Sebastian Hesselbarth
	<sebastian.hesselbarth@...il.com>, Rob Herring <robh@...nel.org>, Krzysztof
 Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Russell
 King <linux@...linux.org.uk>, Konstantin Porotchkin <kostap@...vell.com>
CC: Yazan Shhady <yazan.shhady@...id-run.com>, "linux-phy@...ts.infradead.org"
	<linux-phy@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>
Subject: Re: [PATCH RFC v3 3/6] dt-bindings: phy: cp110-utmi-phy: add
 compatible string for armada-38x


Am 22.07.24 um 17:17 schrieb Krzysztof Kozlowski:
> On 22/07/2024 17:14, Josua Mayer wrote:
>> Am 22.07.24 um 17:05 schrieb Josua Mayer:
>>> Am 21.07.24 um 11:31 schrieb Krzysztof Kozlowski:
>>>> On 20/07/2024 16:19, Josua Mayer wrote:
>>>>> Armada 38x USB-2.0 PHYs are similar to Armada 8K (CP110) and can be
>>>>> supported by the same driver with small differences.
>>>>>
>>>>> Add new compatible string for armada-38x variant of utmi phy.
>>>>> Then add descriptions and names for two additional register definitions
>>>>> that may be specified instead of a syscon phandle.
>>>>>
>>>>> Signed-off-by: Josua Mayer <josua@...id-run.com>
>>>>> ---
>>>>>  .../phy/marvell,armada-cp110-utmi-phy.yaml         | 34 ++++++++++++++++++----
>>>>>  1 file changed, 29 insertions(+), 5 deletions(-)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/phy/marvell,armada-cp110-utmi-phy.yaml b/Documentation/devicetree/bindings/phy/marvell,armada-cp110-utmi-phy.yaml
>>>>> index 9ce7b4c6d208..246e48d51755 100644
>>>>> --- a/Documentation/devicetree/bindings/phy/marvell,armada-cp110-utmi-phy.yaml
>>>>> +++ b/Documentation/devicetree/bindings/phy/marvell,armada-cp110-utmi-phy.yaml
>> cut
>>>>> @@ -68,7 +93,6 @@ required:
>>>>>    - reg
>>>>>    - "#address-cells"
>>>>>    - "#size-cells"
>>>>> -  - marvell,system-controller
>>>> you miss here allOf:if:then: narrowing and marvell,system-controller per
>>>> each variant.
>> I am struggling a bit with the options.
>>
>> First attempt says: if not both usb-cfg and utmi-cfg reg-names are specified,
>> then marvell,system-controller is required.
>>
>> allOf:
>>   - required:
> That's not part of allOf.
>
>>       - compatible
>>       - reg
>>       - "#address-cells"
>>       - "#size-cells"
>>   - if:
>>       not:
>>         properties:
>>           reg-names:
>>             allOf:
>>               - contains:
>>                   const: usb-cfg
>>               - contains:
>>                   const: utmi-cfg
>>     then:
>>       required:
>>         - marvell,system-controller
>>
>> This works okay for any combinations of reg-names.
> ??? I expected this to be per variant.
As in by compatible string?
>
>> However when device-tree is missing reg-names all together,
>> marvell,system-controller is not marked required.
>>
>> Would it be acceptable to make reg-names required?
> I don't understand what you want to achieve.
When there are both usb-cfg and utmi-cfg regs,
then marvell,system-controller is optional,

regardless of armada 380 or 8k.

sincerely
Josua Mayer