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

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Date:   Wed, 8 Jun 2022 12:49:06 +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 13:21, 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.
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
>