On 09/05/2023 16:19, Michal Simek wrote:
>
>
> On 5/7/23 10:07, Krzysztof Kozlowski wrote:
>> On 05/05/2023 15:25, Michal Simek wrote:
>>> The Microchip usb5744 is a SS/HS USB 3.0 hub controller with 4 ports.
>>> The binding describes USB related aspects of the USB5744 hub, it as
>>> well cover the option of connecting the controller as an i2c slave.
>>> When i2c interface is connected hub needs to be initialized first.
>>> Hub itself has fixed i2c address 0x2D but hardcoding address is not good
>>> idea because address can be shifted by i2c address translator in the
>>> middle.
>>>
>>> Signed-off-by: Piyush Mehta <piyush.mehta@xxxxxxx>
>>> Signed-off-by: Michal Simek <michal.simek@xxxxxxx>
>>> ---
>>>
>>> Changes in v2:
>>> - fix i2c-bus property
>>> - swap usb2.0/3.0 compatible strings
>>> - fix indentation in example (4 spaces)
>>> - add new i2c node with microchip,usb5744 compatible property
>>>
>>> It looks like that usb8041 has also an optional i2c interface which is not
>>> covered. But it is mentioned at commit 40e58a8a7ca6 ("dt-bindings: usb:
>>> Add binding for TI USB8041 hub controller").
>>>
>>> i2c-bus name property was suggested by Rob at
>>> https://lore.kernel.org/all/CAL_JsqJedhX6typpUKbnzV7CLK6UZVjq3CyG9iY_j5DLPqvVdw@xxxxxxxxxxxxxx/
>>> and
>>> https://lore.kernel.org/all/CAL_JsqJZBbu+UXqUNdZwg-uv0PAsNg55026PTwhKr5wQtxCjVQ@xxxxxxxxxxxxxx/
>>>
>>> the question is if adding address like this is acceptable.
>>> But it must be specified.
>>>
>>> Driver will follow based on final dt-binding.
>>>
>>> $ref: usb-device.yaml# should be also added but have no idea how to wire it
>>> up to be applied only on usb node not i2c one.
>>>
>>> ---
>>> .../bindings/usb/microchip,usb5744.yaml | 110 ++++++++++++++++++
>>> 1 file changed, 110 insertions(+)
>>> create mode 100644 Documentation/devicetree/bindings/usb/microchip,usb5744.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/usb/microchip,usb5744.yaml b/Documentation/devicetree/bindings/usb/microchip,usb5744.yaml
>>> new file mode 100644
>>> index 000000000000..7e0a3472ea95
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/usb/microchip,usb5744.yaml
>>> @@ -0,0 +1,110 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/usb/microchip,usb5744.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Microchip USB5744 4-port Hub Controller
>>> +
>>> +description:
>>> + Microchip's USB5744 SmartHubTM IC is a 4 port, SuperSpeed (SS)/Hi-Speed (HS),
>>> + low power, low pin count configurable and fully compliant with the USB 3.1
>>> + Gen 1 specification. The USB5744 also supports Full Speed (FS) and Low Speed
>>> + (LS) USB signaling, offering complete coverage of all defined USB operating
>>> + speeds. The new SuperSpeed hubs operate in parallel with the USB 2.0
>>> + controller, so 5 Gbps SuperSpeed data transfers are not affected by slower
>>> + USB 2.0 traffic.
>>> +
>>> +maintainers:
>>> + - Piyush Mehta <piyush.mehta@xxxxxxx>
>>> + - Michal Simek <michal.simek@xxxxxxx>
>>> +
>>> +select:
>>> + properties:
>>> + compatible:
>>> + contains:
>>> + const: microchip,usb5744
>>> + required:
>>> + - compatible
>>
>> I don't understand why do you need this select. It basically disables
>> schema matching for other ones.
>
> I didn't find a way how to have usbXXX,XXXX compatible strings and
> microchip,usb5744 compatible in the same file. I am definitely lacking knowledge
> how to write it properly that's why any advise is welcome.
Hm, if you just have both of them like you have now, what happens?
Best regards,
Krzysztof
