[PATCH] ARM: dts: imx7d-smegw01: Describe USBOTG1 as host

[PATCH] ARM: dts: imx7d-smegw01: Describe USBOTG1 as host

[Fabio Estevam]

The USBOTG1 port will always operate in host mode in Linux,
so describe dr_mode accordingly.

Signed-off-by: Fabio Estevam <festevam@denx.de>
---
 arch/arm/boot/dts/imx7d-smegw01.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/imx7d-smegw01.dts b/arch/arm/boot/dts/imx7d-smegw01.dts
index c0f00f5db11e..386485755676 100644
--- a/arch/arm/boot/dts/imx7d-smegw01.dts
+++ b/arch/arm/boot/dts/imx7d-smegw01.dts
@@ -190,7 +190,7 @@ &uart3 {
 &usbotg1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_usbotg1_lpsr>;
-	dr_mode = "otg";
+	dr_mode = "host";
 	vbus-supply = <&reg_usbotg_vbus>;
 	status = "okay";
 };
-- 
2.25.1


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Re: [PATCH] ARM: dts: imx7d-smegw01: Describe USBOTG1 as host

[Shawn Guo]

On Thu, Feb 09, 2023 at 10:04:29AM -0300, Fabio Estevam wrote:
> The USBOTG1 port will always operate in host mode in Linux,

in Linux?  It could operate in otg mode in bootloader or other OS?

Shawn

> so describe dr_mode accordingly.
> 
> Signed-off-by: Fabio Estevam <festevam@denx.de>
> ---
>  arch/arm/boot/dts/imx7d-smegw01.dts | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/imx7d-smegw01.dts b/arch/arm/boot/dts/imx7d-smegw01.dts
> index c0f00f5db11e..386485755676 100644
> --- a/arch/arm/boot/dts/imx7d-smegw01.dts
> +++ b/arch/arm/boot/dts/imx7d-smegw01.dts
> @@ -190,7 +190,7 @@ &uart3 {
>  &usbotg1 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_usbotg1_lpsr>;
> -	dr_mode = "otg";
> +	dr_mode = "host";
>  	vbus-supply = <&reg_usbotg_vbus>;
>  	status = "okay";
>  };
> -- 
> 2.25.1
> 

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Re: [PATCH] ARM: dts: imx7d-smegw01: Describe USBOTG1 as host

[Fabio Estevam]

Hi Shawn,

On 13/03/2023 05:08, Shawn Guo wrote:
> On Thu, Feb 09, 2023 at 10:04:29AM -0300, Fabio Estevam wrote:
>> The USBOTG1 port will always operate in host mode in Linux,
> 
> in Linux?  It could operate in otg mode in bootloader or other OS?

Yes, in U-Boot it can operate in OTG mode where it can be used in serial
download mode.

In Linux, the USB port only operates in host mode.

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Re: [PATCH] ARM: dts: imx7d-smegw01: Describe USBOTG1 as host

[Shawn Guo]

On Mon, Mar 13, 2023 at 06:52:32AM -0300, Fabio Estevam wrote:
> Hi Shawn,
> 
> On 13/03/2023 05:08, Shawn Guo wrote:
> > On Thu, Feb 09, 2023 at 10:04:29AM -0300, Fabio Estevam wrote:
> > > The USBOTG1 port will always operate in host mode in Linux,
> > 
> > in Linux?  It could operate in otg mode in bootloader or other OS?
> 
> Yes, in U-Boot it can operate in OTG mode where it can be used in serial
> download mode.
> 
> In Linux, the USB port only operates in host mode.

What stops the USB port from operating in OTG mode?

That doesn't sound right, as DT is a description of hardware capability
rather than Linux.

Shawn

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