linux-kernel - Re: [RFT 09/10] arm64: dts: exynos: Correct port of USB-C connector node on Exynos5433 TM2

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Message-ID: <021495a9-7a00-eb91-ddfa-885cc2fb5462@samsung.com>
Date:   Wed, 2 Sep 2020 13:23:50 +0200
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Lee Jones <lee.jones@...aro.org>,
        Sangbeom Kim <sbkim73@...sung.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        alsa-devel@...a-project.org
Cc:     Sylwester Nawrocki <snawrocki@...nel.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [RFT 09/10] arm64: dts: exynos: Correct port of USB-C connector
 node on Exynos5433 TM2


On 31.08.2020 14:50, Marek Szyprowski wrote:
> Hi Krzysztof,
>
> On 29.08.2020 16:25, Krzysztof Kozlowski wrote:
>> The USB-C connector bindings require port@0.  Such port was already
>> described in DTS but outside of the connector itself.  Put it into
>> proper place to fix dtbs_check warnings like:
>>
>>     arch/arm64/boot/dts/exynos/exynos5433-tm2.dt.yaml: musb_connector: ports: 'port@0' is a required property
>>
>> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> I'm not sure if topic should be about USB-C, I will call it simply USB
> connector node. TM2(e) uses Samsung's 11-pin micro USB 2.0 connector,
> which has nothing in common with USB Type-C.
>
> Anyway, this patch breaks DWC3 (tested in Device mode) driver operation,
> so something has to be somehow adjusted or fixed. Added CC Andrzej
> Hajda, who actually worked on this.
>
>> ---
>>
>> Not tested on HQ. Please kindly review and test.
>>
>> Best regards,
>> Krzysztof
>> ---
>>    .../boot/dts/exynos/exynos5433-tm2-common.dtsi    | 15 +++++++--------
>>    1 file changed, 7 insertions(+), 8 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
>> index 6246cce2a15e..bab6c1addd5f 100644
>> --- a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
>> +++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
>> @@ -871,6 +871,13 @@
>>    					#address-cells = <1>;
>>    					#size-cells = <0>;
>>    
>> +					port@0 {
>> +						reg = <0>;
>> +						muic_to_usb: endpoint {
>> +							remote-endpoint = <&usb_to_muic>;
>> +						};
>> +					};
>> +


According to not-yet-yaml documentation of dt-bindings (patch 05/10):
> -Required nodes:
> -- any data bus to the connector should be modeled using the OF graph bindings
> -  specified in bindings/graph.txt, unless the bus is between parent node and
> -  the connector.

This is 'unless' case - muic is parent of the connector, so the port 0 is not necessary.


>>    					port@3 {
>>    						reg = <3>;
>>    						musb_con_to_mhl: endpoint {
>> @@ -879,14 +886,6 @@
>>    					};
>>    				};
>>    			};
>> -
>> -			ports {
>> -				port {
>> -					muic_to_usb: endpoint {
>> -						remote-endpoint = <&usb_to_muic>;
>> -					};
>> -				};


And this port belongs to MUIC - it describes connection between USB-HOST 
and MUIC, it has nothing to do with the connector, and is necessary.


Regards

Andrzej


>> -			};
>>    		};
>>    
>>    		regulators {
> Best regards