linux-kernel - Re: [PATCH 3/3] riscv: dts: microchip: fix icicle kit's dr

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Date:   Thu, 9 Jun 2022 08:23:15 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <heinrich.schuchardt@...onical.com>
CC:     <Daire.McNamara@...rochip.com>,
        <Valentina.FernandezAlanis@...rochip.com>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <gregkh@...uxfoundation.org>,
        <b-liu@...com>
Subject: Re: [PATCH 3/3] riscv: dts: microchip: fix icicle kit's dr_mode

On 08/06/2022 13:47, Conor Dooley wrote:
> On 08/06/2022 13:21, Heinrich Schuchardt wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>
>> On 6/7/22 15:22, Conor Dooley wrote:
>>> The usb on icicle kit is actually configured for otg, not host mode.
>>> Swap it over.
>>
>> To my understanding both host mode and OTG mode could  be supported by
>> the hardware.
>>
>> Jumper J17 on
>> https://www.microsemi.com/images/10/MicrosoftTeams-image%201.png.
>> USB device mode selection - Open: USB client. Closed: USB host
>>
>> Is OTG really the most important scenario for running the board? I
>> personally would prefer to run it in host mode to add more peripherals.
>> What is missing on the driver side to enable host mode?
> 
> Nothing. I'll drop the the patch for v2 :)
> 
>> Can we detect the 5 Volt jumper setting via GPIO?
> 
> I have to check if a GPIO can be routed that way & I'll get back to you.

Unfortunately not, that jumper can't be connected to a GPIO.

> Thanks,
> Conor.
> 
>>
>> Best regards
>>
>> Heinrich
>>
>>>
>>> Fixes: 528a5b1f2556 ("riscv: dts: microchip: add new peripherals to icicle kit device tree")
>>> Signed-off-by: Conor Dooley<conor.dooley@...rochip.com>
>>> ---
>>>   arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts b/arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts
>>> index 044982a11df5..121b01c8784f 100644
>>> --- a/arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts
>>> +++ b/arch/riscv/boot/dts/microchip/mpfs-icicle-kit.dts
>>> @@ -158,5 +158,5 @@ &syscontroller {
>>>
>>>   &usb {
>>>       status = "okay";
>>> -     dr_mode = "host";
>>> +     dr_mode = "otg";
>>>   };
>>> -- 2.36.1
>>
>