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Subject: Re: [PATCH v2] dt-bindings: convert extcon-usbc-cros-ec.txt
 extcon-usbc-cros-ec.yaml
To:     Rob Herring <robh@kernel.org>
Cc:     Dafna Hirschfeld <dafna.hirschfeld@collabora.com>,
        devicetree@vger.kernel.org, myungjoo.ham@samsung.com,
        cw00.choi@samsung.com, mark.rutland@arm.com, bleung@chromium.org,
        groeck@chromium.org, linux-kernel@vger.kernel.org,
        helen.koike@collabora.com, ezequiel@collabora.com,
        kernel@collabora.com, dafna3@gmail.com
References: <20200205110029.3395-1-dafna.hirschfeld@collabora.com>
 <59ec876a-a77a-9b6d-34dd-272292102ed9@collabora.com>
 <20200206214005.GA20153@bogus>
From:   Enric Balletbo i Serra <enric.balletbo@collabora.com>
Message-ID: <a7363495-3525-3cdf-d926-7bf17385765d@collabora.com>
Date:   Fri, 7 Feb 2020 09:05:47 +0100
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On 6/2/20 22:40, Rob Herring wrote:
> On Thu, Feb 06, 2020 at 04:47:59PM +0100, Enric Balletbo i Serra wrote:
>> Hi Dafna,
>>
>> On 5/2/20 12:00, Dafna Hirschfeld wrote:
>>> convert the binding file extcon-usbc-cros-ec.txt to yaml format
>>> This was tested and verified on ARM with:
>>> make dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/extcon/extcon-usbc-cros-ec.yaml
>>> make dtbs_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/extcon/extcon-usbc-cros-ec.yaml
>>>
>>> Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
>>> ---
>>> Changes since v1:
>>> 1 - changing the license to (GPL-2.0-only OR BSD-2-Clause)
>>> 2 - changing the maintainers
>>> 3 - changing the google,usb-port-id property to have minimum 0 and maximum 255
>>>
>>>  .../bindings/extcon/extcon-usbc-cros-ec.txt   | 24 ----------
>>>  .../bindings/extcon/extcon-usbc-cros-ec.yaml  | 45 +++++++++++++++++++
>>>  2 files changed, 45 insertions(+), 24 deletions(-)
>>>  delete mode 100644 Documentation/devicetree/bindings/extcon/extcon-usbc-cros-ec.txt
>>>  create mode 100644 Documentation/devicetree/bindings/extcon/extcon-usbc-cros-ec.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/extcon/extcon-usbc-cros-ec.txt b/Documentation/devicetree/bindings/extcon/extcon-usbc-cros-ec.txt
>>> deleted file mode 100644
>>> index 8e8625c00dfa..000000000000
>>> --- a/Documentation/devicetree/bindings/extcon/extcon-usbc-cros-ec.txt
>>> +++ /dev/null
>>> @@ -1,24 +0,0 @@
>>> -ChromeOS EC USB Type-C cable and accessories detection
>>> -
>>> -On ChromeOS systems with USB Type C ports, the ChromeOS Embedded Controller is
>>> -able to detect the state of external accessories such as display adapters
>>> -or USB devices when said accessories are attached or detached.
>>> -
>>> -The node for this device must be under a cros-ec node like google,cros-ec-spi
>>> -or google,cros-ec-i2c.
>>> -
>>> -Required properties:
>>> -- compatible:		Should be "google,extcon-usbc-cros-ec".
>>> -- google,usb-port-id:	Specifies the USB port ID to use.
>>> -
>>> -Example:
>>> -	cros-ec@0 {
>>> -		compatible = "google,cros-ec-i2c";
>>> -
>>> -		...
>>> -
>>> -		extcon {
>>> -			compatible = "google,extcon-usbc-cros-ec";
>>> -			google,usb-port-id = <0>;
>>> -		};
>>> -	}
>>> diff --git a/Documentation/devicetree/bindings/extcon/extcon-usbc-cros-ec.yaml b/Documentation/devicetree/bindings/extcon/extcon-usbc-cros-ec.yaml
>>> new file mode 100644
>>> index 000000000000..fd95e413d46f
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/extcon/extcon-usbc-cros-ec.yaml
>>> @@ -0,0 +1,45 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/extcon/extcon-usbc-cros-ec.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: ChromeOS EC USB Type-C cable and accessories detection
>>> +
>>> +maintainers:
>>> +  - Benson Leung <bleung@chromium.org>
>>> +  - Enric Balletbo i Serra <enric.balletbo@collabora.com>
>>> +
>>> +description: |
>>> +  On ChromeOS systems with USB Type C ports, the ChromeOS Embedded Controller is
>>> +  able to detect the state of external accessories such as display adapters
>>> +  or USB devices when said accessories are attached or detached.
>>> +  The node for this device must be under a cros-ec node like google,cros-ec-spi
>>> +  or google,cros-ec-i2c.
>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: google,extcon-usbc-cros-ec
>>> +
>>> +  google,usb-port-id:
>>> +    allOf:
>>> +      - $ref: /schemas/types.yaml#/definitions/uint32
>>> +    description: the port id
>>> +    minimum: 0
>>> +    maximum: 255
>>> +
>>> +required:
>>> +  - compatible
>>> +  - google,usb-port-id
>>> +
>>> +additionalProperties: false
>>> +
>>> +examples:
>>> +  - |
>>> +    cros-ec@0 {
>>> +        compatible = "google,cros-ec-i2c";
>>
>> Now that you are here ... could you use compatible = "google,cros-ec-spi" here?
>>
>> The reason is that the label above, cros-ec@0 is not really correct for an i2c
>> device because after the @ you should put the address, cros-ec@1e will have more
>> sense here. But cros-ec-i2c is rarely used, so I'd change the compatible to use
>> "google,cros-ec-spi" and the entry "cros-ec@0" is fine.
>>
>>> +        extcon {
>>> +            compatible = "google,extcon-usbc-cros-ec";
>>> +            google,usb-port-id = <0>;
>>> +        };
>>
>> And maybe would be useful have a more complete example like this?
>>
>>     cros-ec@0 {
>>         compatible = "google,cros-ec-spi";
> 
> There should also be a 'spi' parent node and 'reg' here.
> 
>>
>> 	usbc_extcon0: extcon@0 {
> 
> And no unit-address here as there's no 'reg'.
> 

Thanks for pointing all this, I'll fix current users of this binding, as they
are wrong.

Thanks,
 Enric

>> 		compatible = "google,extcon-usbc-cros-ec";
>> 		google,usb-port-id = <0>;
>> 	};
>>
>>
>> 	usbc_extcon1: extcon@1 {
>> 		compatible = "google,extcon-usbc-cros-ec";
>> 		google,usb-port-id = <1>;
>> 	};
>>     };