RE: [PATCH v3 1/1] arm64: dts: tqma8mpql: add USB DR support

[Jun Li <jun.li@xxxxxxx>]

> -----Original Message-----
> From: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
> Sent: Tuesday, October 18, 2022 3:41 AM
> To: tharvey@xxxxxxxxxxxxx
> Cc: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>; Shawn Guo
> <shawnguo@xxxxxxxxxx>; Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>;
> devicetree@xxxxxxxxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>; Pengutronix
> Kernel Team <kernel@xxxxxxxxxxxxxx>; Fabio Estevam <festevam@xxxxxxxxx>;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; Jun Li <jun.li@xxxxxxx>
> Subject: Re: [PATCH v3 1/1] arm64: dts: tqma8mpql: add USB DR support
> 
> Hello Tim,
> 
> On 17.10.22 21:30, Tim Harvey wrote:
> > On Fri, Oct 14, 2022 at 7:18 AM Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
> wrote:
> >>
> >> Hello Alexander,
> >>
> >> On 05.09.22 09:37, Alexander Stein wrote:
> >>> +     pinctrl_usb0: usb0grp {
> >>> +             fsl,pins = <MX8MP_IOMUXC_GPIO1_IO13__USB1_OTG_OC
> 0x1c0>,
> >>> +                        <MX8MP_IOMUXC_GPIO1_IO12__USB1_OTG_PWR
> 0x1c0>;
> >>> +     };
> >>> +
> >>> +     pinctrl_usbcon0: usb0congrp {
> >>> +             fsl,pins = <MX8MP_IOMUXC_GPIO1_IO10__GPIO1_IO10
> 0x1c0>;
> >>> +     };
> >>
> >> I am wondering: You can mux for MX8MP_IOMUXC_GPIO1_IO10__USB1_OTG_ID,
> >> why did you decide against using the hardware function here?
> >>
> >
> > Ahmad,
> >
> > The IMX8MP USB OTG_ID pins are internally not connected. I can't
> > recall where this is mentioned but due to this they can not be used to
> > select host/device mode.
> 
> Thanks for the info. Do you know if this issue exists with the i.MX8MN as
> well? A colleague had trouble bringing up the OTG_ID HW function and I assume
> it may be the same issue. I am unsure though, because the
> imx8mn-tqma8mqnl-mba8mx.dts muxes the pad as OTG_ID.

No, iMX8MN is completely different IP(USB2 only) than iMX8MP, iMX8MN
has *OTG* inside so the ID functionality should be fine, what's the
trouble you colleague had?

Li Jun
 
> 
> Cheers,
> Ahmad
> 
> >
> > Best Regards,
> >
> > Tim
> >
> 
> 
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