From: Roger Quadros <rogerq@ti.com>
To: Robin Murphy <robin.murphy@arm.com>,
Andrzej Hajda <a.hajda@samsung.com>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
Felipe Balbi <balbi@kernel.org>,
Archit Taneja <architt@codeaurora.org>,
<linux-samsung-soc@vger.kernel.org>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
<linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<dri-devel@lists.freedesktop.org>,
Inki Dae <inki.dae@samsung.com>,
Chanwoo Choi <cw00.choi@samsung.com>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzk@kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [PATCH v5 1/6] dt-bindings: add bindings for USB physical connector
Date: Thu, 15 Mar 2018 19:08:32 +0200 [thread overview]
Message-ID: <a470c2e0-09ea-fc3a-2eef-bba2af18b33f@ti.com> (raw)
In-Reply-To: <1c3f8cde-4f9a-306f-b4f9-c0bdc76caf1f@arm.com>
On 15/03/18 13:46, Robin Murphy wrote:
> On 12/03/18 10:41, Roger Quadros wrote:
> [...]
>>>>> @@ -0,0 +1,75 @@
>>>>> +USB Connector
>>>>> +=============
>>>>> +
>>>>> +USB connector node represents physical USB connector. It should be
>>>>> +a child of USB interface controller.
>>>>> +
>>>>> +Required properties:
>>>>> +- compatible: describes type of the connector, must be one of:
>>>>> + "usb-a-connector",
>>>>> + "usb-b-connector",
>>>>> + "usb-c-connector".
>>>> compatible should be just "usb-connector"
>>>>
>>>> Type should be a property
>>>>
>>>> type: type of usb connector "A", "B", "AB", "C"
>>>> AB is for dual-role connectors.
>>>
>>> I have proposed such property (and size also) in my first RFC [1]. Rod
>>> did not like it :)
>>>
>>> [1]: https://marc.info/?l=devicetree&m=150660411515233&w=2
>>>
>>
>> This is what Rob says here https://patchwork.kernel.org/patch/9976043/
>> "We did "type" for hdmi-connector, but I think I'd really prefer
>> compatible be used to distinguish as least where it may matter to s/w.
>> In the HDMI case, they all are pretty much the same, just different
>> physical size."
>>
>> So the question is. Does it matter to this particular software implementation
>> if it is type A,B,C connector?
>> If yes, how?
>>
>> Type A will never have any alternate function. It is always dedicated to USB.
>
> In USB spec terms, at least. In reality there are things like the cool trick Rockchip SoCs do whereby they can expose the debug UART Rx/Tx through the OTG port's D+/D- pins, and that is on a type A connector in many products. I'm guessing that's probably beyond the scope of this binding, though.
>
>> Also does the size "full", "micro", "mini" matter to software?
>
> If it means the user can look in sysfs to easily correlate logical ports with physical connectors that's certainly handy (e.g. on something like Odroid-XU where the two USB3 ports are brought out to an A and a micro-AB connector respectively).
But this logic fails if both connectors are the same type/size.
This is where the label comes in handy. The labels can be unique and end user can identify the port using that.
>
> Robin.
--
cheers,
-roger
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
next prev parent reply other threads:[~2018-03-15 17:08 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20180227071137eucas1p104aeeb0fd926fe985e250174d9d65b2e@eucas1p1.samsung.com>
2018-02-27 7:11 ` [PATCH v5 0/6] dt-bindings: add bindings for USB physical connector Andrzej Hajda
[not found] ` <CGME20180227071138eucas1p17e1e16f13f6d3e3b15a57dc93eb8cf3f@eucas1p1.samsung.com>
2018-02-27 7:11 ` [PATCH v5 1/6] " Andrzej Hajda
2018-03-02 13:13 ` Heikki Krogerus
2018-03-05 8:18 ` Andrzej Hajda
2018-03-05 10:27 ` Heikki Krogerus
2018-03-05 22:14 ` Rob Herring
2018-03-09 10:24 ` Roger Quadros
2018-03-12 7:02 ` Andrzej Hajda
2018-03-12 7:06 ` Andrzej Hajda
2018-03-12 10:41 ` Roger Quadros
2018-03-15 11:02 ` Andrzej Hajda
2018-03-15 11:46 ` Robin Murphy
2018-03-15 17:08 ` Roger Quadros [this message]
[not found] ` <CGME20180227071139eucas1p125ee35ada221fbed1dc85b7fc250f9ca@eucas1p1.samsung.com>
2018-02-27 7:11 ` [PATCH v5 2/6] dt-bindings: add bindings for Samsung micro-USB 11-pin connector Andrzej Hajda
[not found] ` <CGME20180227071139eucas1p1d28b39a6636a7e6625aeb3a16091f81a@eucas1p1.samsung.com>
2018-02-27 7:11 ` [PATCH v5 3/6] arm64: dts: exynos: add micro-USB connector node to TM2 platforms Andrzej Hajda
2018-03-06 16:49 ` Krzysztof Kozlowski
[not found] ` <CGME20180227071140eucas1p15a8b8443c6d52c5fab79cc82c37dce09@eucas1p1.samsung.com>
2018-02-27 7:11 ` [PATCH v5 4/6] arm64: dts: exynos: add OF graph between MHL and USB connector Andrzej Hajda
2018-03-06 16:49 ` Krzysztof Kozlowski
[not found] ` <CGME20180227071141eucas1p1170216070d70007a07de120a0dc3363a@eucas1p1.samsung.com>
2018-02-27 7:11 ` [PATCH v5 5/6] extcon: add possibility to get extcon device by OF node Andrzej Hajda
2018-02-27 11:03 ` Chanwoo Choi
[not found] ` <CGME20180227122215eucas1p11a1a12c26665f032c666d10effaf15fc@eucas1p1.samsung.com>
2018-02-27 12:22 ` [PATCH v6 " Andrzej Hajda
[not found] ` <CGME20180227071142eucas1p10203dac2558db034a4a3287220213601@eucas1p1.samsung.com>
2018-02-27 7:11 ` [PATCH v5 6/6] drm/bridge/sii8620: use micro-USB cable detection logic to detect MHL Andrzej Hajda
2018-02-27 11:08 ` Chanwoo Choi
2018-02-27 12:05 ` Andrzej Hajda
2018-02-27 22:26 ` Chanwoo Choi
2018-02-28 13:44 ` Andrzej Hajda
2018-03-02 0:29 ` Chanwoo Choi
2018-03-06 12:53 ` [PATCH v5 0/6] dt-bindings: add bindings for USB physical connector Andrzej Hajda
2018-03-06 13:08 ` Krzysztof Kozlowski
2018-03-07 2:12 ` Chanwoo Choi
2018-03-07 4:48 ` Chanwoo Choi
2018-03-07 11:13 ` Andrzej Hajda
2018-03-07 11:22 ` Krzysztof Kozlowski
2018-03-07 11:40 ` Andrzej Hajda
2018-03-08 1:52 ` Chanwoo Choi
2018-03-09 9:20 ` Andrzej Hajda
2018-03-12 1:29 ` Chanwoo Choi
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