linux-kernel - Re: [PATCH v1 0/6] arm64: dts: verdin-imx8mp: usb dual-role switching et. al.

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Date:   Fri, 11 Nov 2022 13:48:56 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Marcel Ziswiler <marcel@...wiler.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Peter Chen <peter.chen@...nel.org>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Fabio Estevam <festevam@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Max Krummenacher <max.krummenacher@...adex.com>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Philippe Schenker <philippe.schenker@...adex.com>,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/6] arm64: dts: verdin-imx8mp: usb dual-role
 switching et. al.

On Wed, Nov 02, 2022 at 02:11:57PM +0100, Marcel Ziswiler wrote:
> From: Marcel Ziswiler <marcel.ziswiler@...adex.com>
> 
> 
> This series is an assortment of USB dual-role specific commits as
> follows:
> 
> Improvement of pinctrl for vbus-supplies:
> As we are using two fixed regulators for Verdin USB_1_EN (SODIMM 155)
> and Verdin USB_2_EN (SODIMM 185), those should be muxed as GPIOs rather
> than OTG_PWR.
> 
> Removal of USB_2 over-current detection disabling:
> The disable-over-current property is only applicable for the
> ci-hdrc-usb2 and dwc2 drivers while the i.MX 8M Plus integrates dwc3
> IP. Therefore remove this property which does not really serve any
> purpose here.
> 
> Addition of USB_1 over-current detection:
> Add Verdin USB_1 over-current detection functionality via Verdin
> USB_1_OC# (SODIMM 157) being active-low and removing its previous
> gpio_hog3 mapping.
> 
> Disabling of USB port power controls:
> Disable port power control on Verdin USB_1/2 as we use regular
> fixed-regulators with Verdin USB_1/2_EN as enable GPIOs.
> 
> Addition of GPIO USB-B connector:
> Add GPIO USB-B connector (gpio-usb-b-connector) functionality using
> Verdin USB_1_ID.
> 
> Marking USB_2 as permanently attached:
> As both Dahlia and the Verdin Development Board have on-carrier
> permanently attached USB hubs mark Verdin USB_2 as such.
> 
> Note:
> Currently, I am still seeing a rare race condition of sorts when booting
> the system with Verdin USB_1 as a host port with a USB memory stick
> plugged in. This exact patch series applied on top of NXP's latest
> downstream 5.15.52_2.1.0 release (together with backporting a few more
> dwc3-specific patches) actually makes this same use case work very
> reliably. However, NXP also keeps further downstream-only patches which
> I plan to further investigate and hopefully upstream a proper fix for
> soon.

Thanks for the noting!

> 
> 
> Marcel Ziswiler (6):
>   arm64: dts: verdin-imx8mp: improve pinctrl for vbus-supplies
>   arm64: dts: verdin-imx8mp: remove usb_2 over-current detection
>     disabling
>   arm64: dts: verdin-imx8mp: add usb_1 over-current detection
>   arm64: dts: verdin-imx8mp: disable usb port power control
>   arm64: dts: verdin-imx8mp: add gpio usb-b connector
>   arm64: dts: verdin-imx8mp: dahlia: mark usb_2 permanently attached

Applied all, thanks!