linux-kernel - Re: [PATCH v4] dt-bindings: phy: rockchip-emmc-phy: Convert to dtschema

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Date: Tue, 18 Jun 2024 08:20:32 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Shresth Prasad <shresthprasad7@...il.com>
Cc: vkoul@...nel.org, kishon@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, heiko@...ech.de, sebastian.reichel@...labora.com,
 andy.yan@...k-chips.com, s.hauer@...gutronix.de, jbx6244@...dex.com,
 linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org, javier.carrasco.cruz@...il.com,
 skhan@...uxfoundation.org
Subject: Re: [PATCH v4] dt-bindings: phy: rockchip-emmc-phy: Convert to
 dtschema

On 17/06/2024 20:14, Shresth Prasad wrote:

>>> +examples:
>>> +  - |
>>> +    grf: syscon@...70000 {
>>
>> Drop label... actually entire node looks not needed.
> 
> From what I understand, this `phy` node should be a sub-node of a `grf`
> node which is why it is part of the example.
> 
>>
>>> +      compatible = "rockchip,rk3399-grf", "syscon", "simple-mfd";
>>
>> Drop
>>
>>> +      reg = <0xff770000 0x10000>;
>>
>> Drop
> 
> Removing `reg` causes the following warning:
> Warning (unit_address_vs_reg): /example-0/syscon@...70000: node has a
> unit name, but no reg or ranges property
> 
> Please let me know what the prefered solution would be here.

Obviously you need to drop entire node... You cannot just drop reg and
leave unit address.

> 
>>
>>
>>> +      #address-cells = <1>;
>>> +      #size-cells = <1>;
>>> +
>>> +      emmcphy: phy@...0 {
>>
>> Drop label
>>
>>> +        compatible = "rockchip,rk3399-emmc-phy";
>>> +        reg = <0xf780 0x20>;
>>> +        clocks = <&sdhci>;
>>> +        clock-names = "emmcclk";
>>> +        drive-impedance-ohm = <50>;
>>> +        #phy-cells = <0>;
>>> +      };
>>> +    };
>>> diff --git a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
>>> deleted file mode 100644
>>> index 57d28c0d5696..000000000000
>>> --- a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
>>> +++ /dev/null
>>> @@ -1,43 +0,0 @@
>>> -Rockchip EMMC PHY
>>> ------------------------
>>> -
>>> -Required properties:
>>> - - compatible: rockchip,rk3399-emmc-phy
>>> - - #phy-cells: must be 0
>>> - - reg: PHY register address offset and length in "general
>>> -   register files"
>>> -
>>> -Optional properties:
>>> - - clock-names: Should contain "emmcclk".  Although this is listed as optional
>>> -             (because most boards can get basic functionality without having
>>> -             access to it), it is strongly suggested.
>>> -             See ../clock/clock-bindings.txt for details.
>>> - - clocks: Should have a phandle to the card clock exported by the SDHCI driver.
>>> - - drive-impedance-ohm: Specifies the drive impedance in Ohm.
>>> -                        Possible values are 33, 40, 50, 66 and 100.
>>> -                        If not set, the default value of 50 will be applied.
>>> - - rockchip,enable-strobe-pulldown: Enable internal pull-down for the strobe
>>> -                                    line.  If not set, pull-down is not used.
>>> - - rockchip,output-tapdelay-select: Specifies the phyctrl_otapdlysec register.
>>> -                                    If not set, the register defaults to 0x4.
>>> -                                    Maximum value 0xf.
>>> -
>>> -Example:
>>> -
>>> -
>>> -grf: syscon@...70000 {
>>> -     compatible = "rockchip,rk3399-grf", "syscon", "simple-mfd";
>>> -     #address-cells = <1>;
>>> -     #size-cells = <1>;
>>> -
>>> -...
>>> -
>>> -     emmcphy: phy@...0 {
>>> -             compatible = "rockchip,rk3399-emmc-phy";
>>> -             reg = <0xf780 0x20>;
>>> -             clocks = <&sdhci>;
>>> -             clock-names = "emmcclk";
>>> -             drive-impedance-ohm = <50>;
>>> -             #phy-cells = <0>;
>>> -     };
>>> -};
>>> diff --git a/Documentation/devicetree/bindings/soc/rockchip/grf.yaml b/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
>>> index 79798c747476..6e1b1cdea680 100644
>>> --- a/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
>>> +++ b/Documentation/devicetree/bindings/soc/rockchip/grf.yaml
>>> @@ -176,9 +176,12 @@ allOf:
>>>              Documentation/devicetree/bindings/phy/rockchip-pcie-phy.txt
>>>
>>>        patternProperties:
>>> -        "phy@[0-9a-f]+$":
>>> -          description:
>>> -            Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
>>> +        "^phy@[0-9a-f]+$":
>>> +          type: object
>>> +
>>
>> Drop blank line
>>
>>> +          $ref: /schemas/phy/rockchip,rk3399-emmc-phy.yaml#
>>> +
>>
>> Drop blank line
> 
> The rest of the document also has these blank lines, which is why I've
> also kept them here. Are you sure I should remove them?

Yes

> 
>>
>>> +          unevaluatedProperties: false
>>>
>>>    - if:
>>>        properties:
>>
>> Nothing in example? Isn't the example for 3399?
>>
>> We want only one complete example of such multi-children devices, so the
>> example can be moved and included in existing one here.
> 
> The example in this file is actually for `rockchip,rk3399-usb2phy` and
> not `rockchip,rk3399-emmc-phy` which is why I haven't touched it.

What? That's gref, not usb2phy.

This patch and your explanations are very confusing.



Best regards,
Krzysztof