linux-kernel - Re: [PATCH v2] arm64: dts: imx8mn-var-som-symphony: fix USB OTG

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Date:   Tue, 18 Jul 2023 14:37:15 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Hugo Villeneuve <hugo@...ovil.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Hugo Villeneuve <hvilleneuve@...onoff.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: imx8mn-var-som-symphony: fix USB OTG

On Wed, Jul 05, 2023 at 01:49:32PM -0400, Hugo Villeneuve wrote:
> From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> 
> USB OTG is currently broken on the Variscite Symphony EVK and imx8mn
> nano SOM.
> 
> The PTN5150 circuitry on newer versions of the Symphony EVK board has
> a non-standard configuration in which the PTN5150 IRQ pin is left
> unconnected, and the PTN5150 ID pin is connected to GPIO1_IO11. This
> requires changes to the ptn5150 driver to support this new mode.
> Variscite have indicated their intention to submit those changes
> upstream.
> 
> In the meantime, import device tree changes from linux-5.15 branch of
> varigit repos to at least make the USB OTG port operate correctly in
> host mode.
> 
> Fixes: 7358e05bddca ("arm64: dts: imx8mn-var-som-symphony: Add Variscite Symphony board with VAR-SOM-MX8MN")

Has USB OTG been ever worked at all?  If the answer is no, it's not
a fix but a new feature, and I would suggest you rework the patch
subject and drop the Fixes tag.

Shawn

> Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
> ---
> Link: [v1] https://lkml.org/lkml/2023/7/4/702
> 
> Changes from v1:
> - Add comments about PTN5150 IRQ/ID line connections
> - Remove "typec1_con: connector" node
> - Change IRQ type to IRQ_TYPE_EDGE_FALLING
> 
>  .../dts/freescale/imx8mn-var-som-symphony.dts | 32 +++++++++++++++++--
>  1 file changed, 30 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts b/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
> index 406a711486da..a7a57442cb81 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
> @@ -1,11 +1,14 @@
>  // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
>  /*
> + * Supports Symphony evaluation board versions >= 1.4a.
> + *
>   * Copyright 2019-2020 Variscite Ltd.
>   * Copyright (C) 2020 Krzysztof Kozlowski <krzk@...nel.org>
>   */
>  
>  /dts-v1/;
>  
> +#include <dt-bindings/usb/pd.h>
>  #include "imx8mn-var-som.dtsi"
>  
>  / {
> @@ -100,14 +103,26 @@ enet-sel-hog {
>  		};
>  	};
>  
> +	/*
> +	 * For Symphony board version <= 1.4, the PTN5150 IRQ pin is connected
> +	 * to GPIO1_IO11 on the SoM (R106 present, R132 absent). From Symphony
> +	 * board version >= 1.4a, the PTN5150 ID pin is connected to GPIO1_IO11
> +	 * on the SoM (R106 absent, R132 present).
> +	 */
>  	extcon_usbotg1: typec@3d {
>  		compatible = "nxp,ptn5150";
>  		reg = <0x3d>;
>  		interrupt-parent = <&gpio1>;
> -		interrupts = <11 IRQ_TYPE_LEVEL_LOW>;
> +		interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
>  		pinctrl-names = "default";
>  		pinctrl-0 = <&pinctrl_ptn5150>;
>  		status = "okay";
> +
> +		port {
> +			typec1_dr_sw: endpoint {
> +				remote-endpoint = <&usb1_drd_sw>;
> +			};
> +		};
>  	};
>  };
>  
> @@ -148,8 +163,21 @@ &uart3 {
>  };
>  
>  &usbotg1 {
> +	dr_mode = "otg";
> +	hnp-disable;
> +	srp-disable;
> +	adp-disable;
> +	usb-role-switch;
>  	disable-over-current;
> -	extcon = <&extcon_usbotg1>, <&extcon_usbotg1>;
> +	samsung,picophy-pre-emp-curr-control = <3>;
> +	samsung,picophy-dc-vol-level-adjust = <7>;
> +	status = "okay";
> +
> +	port {
> +		usb1_drd_sw: endpoint {
> +			remote-endpoint = <&typec1_dr_sw>;
> +		};
> +	};
>  };
>  
>  &iomuxc {
> 
> base-commit: d528014517f2b0531862c02865b9d4c908019dc4
> -- 
> 2.30.2
>