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

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Date:   Tue, 4 Jul 2023 11:31:24 -0400
From:   Hugo Villeneuve <hugo@...ovil.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Shawn Guo <shawnguo@...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] arm64: dts: imx8mn-var-som-symphony: fix USB OTG

On Tue, 4 Jul 2023 17:08:12 +0200
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> On 04/07/2023 17:02, Hugo Villeneuve wrote:
> > From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> > 
> > USB OTG is currently broken on the Variscite Symphony EVK and imx8mn
> > nano SOM.
> > 
> > Import changes from linux-5.15 branch of  doen't giveto fix it.
> > 
> > Link: https://github.com/varigit/linux-imx.git
> > Fixes: 7358e05bddca ("arm64: dts: imx8mn-var-som-symphony: Add Variscite Symphony board with VAR-SOM-MX8MN")
> > Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
> > ---
> >  .../dts/freescale/imx8mn-var-som-symphony.dts | 37 ++++++++++++++++++-
> >  1 file changed, 35 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..aef89198f24c 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
> > +++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som-symphony.dts
> > @@ -6,6 +6,7 @@
> >  
> >  /dts-v1/;
> >  
> > +#include <dt-bindings/usb/pd.h>
> >  #include "imx8mn-var-som.dtsi"
> >  
> >  / {
> > @@ -104,10 +105,29 @@ extcon_usbotg1: typec@3d {
> >  		compatible = "nxp,ptn5150";
> >  		reg = <0x3d>;
> >  		interrupt-parent = <&gpio1>;
> > -		interrupts = <11 IRQ_TYPE_LEVEL_LOW>;
> > +		interrupts = <11 IRQ_TYPE_NONE>;
> 
> That's surprising, why?

Hi,
the varigit repos log or source code has no information about this
particular configuration.

In the schematics, the interrupt output pin of the PTN5150 is connected
to two different resistors, one of these being connected to GPIO1 pin
11. But these two resistors are not assembled on any versions of the
board, so the interrupt pin is currently not used.

Hugo.