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

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Message-Id: <20221102131203.35648-1-marcel@ziswiler.com>
Date:   Wed,  2 Nov 2022 14:11:57 +0100
From:   Marcel Ziswiler <marcel@...wiler.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     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>,
        Shawn Guo <shawnguo@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 0/6] arm64: dts: verdin-imx8mp: usb dual-role switching et. al.

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.

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

 .../dts/freescale/imx8mp-verdin-dahlia.dtsi   |  1 +
 .../boot/dts/freescale/imx8mp-verdin.dtsi     | 40 ++++++++++++++-----
 2 files changed, 32 insertions(+), 9 deletions(-)

-- 
2.36.1