linux-kernel - Re: [PATCH 2/2] arm64: dts: exynos: add OF graph between USB-PHY and MUIC

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Date:   Thu, 1 Feb 2018 09:43:53 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Andrzej Hajda <a.hajda@...sung.com>
Cc:     "open list:DESIGNWARE USB3 DRD IP DRIVER" <linux-usb@...r.kernel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Inki Dae <inki.dae@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: exynos: add OF graph between USB-PHY and MUIC

On Thu, Feb 1, 2018 at 9:19 AM, Andrzej Hajda <a.hajda@...sung.com> wrote:
> On 01.02.2018 08:50, Krzysztof Kozlowski wrote:
>> On Wed, Jan 31, 2018 at 4:57 PM, Andrzej Hajda <a.hajda@...sung.com> wrote:
>>> OF graph describes USB data lanes between USB-PHY and respective MUIC.
>>> Since graph is present and DWC driver can use it to get extcon, obsolete
>>> extcon property can be removed.
>>>
>>> Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
>>> ---
>>>  arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi | 18 +++++++++++++++++-
>>>  1 file changed, 17 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
>>> index 427ff861b441..b20b42659206 100644
>>> --- a/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
>>> +++ b/arch/arm64/boot/dts/exynos/exynos5433-tm2-common.dtsi
>>> @@ -828,6 +828,17 @@
>>>                                         };
>>>                                 };
>>>                         };
>>> +
>>> +                       ports {
>>> +                               #address-cells = <1>;
>>> +                               #size-cells = <0>;
>>> +
>>> +                               port@0 {
>>> +                                       reg = <0>;
>>> +                                       muic_to_usb: endpoint {
>>> +                                               remote-endpoint = <&usb_to_muic>;
>>> +                                       };
>>> +                               };
>>>                         };
>>>                 };
>>>
>>> @@ -1242,12 +1253,17 @@
>>>
>>>  &usbdrd_dwc3 {
>>>         dr_mode = "otg";
>>> -       extcon = <&muic>;
>> Look ok for me.
>>
>> Does this depend on #1 patch for DWC?
>
> Yes, it depends. #1 adds code to find extcon using graph, without it
> dwc3 won't be able to work in dual-role mode.
> Alternatively, I could split this patch into two parts:
> 2a. adding graph bindings.
> 2b. removing extcon property.
> In such case only 2b depends on #1.

Without splitting, this patch would have to wait till #1 gets into
mainline (so probably till v4.17-rc1 because we are in merge window
already). I am fine with this split-approach so only the cleanup patch
would get postponed. Up to you.

Best regards,
Krzysztof