linux-kernel - Re: [PATCH 4/4] arm64: dts: imx8mn: Add power-domain reference in USB controller

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Date:   Fri, 23 Oct 2020 06:03:32 -0500
From:   Adam Ford <aford173@...il.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     arm-soc <linux-arm-kernel@...ts.infradead.org>,
        Marek Vasut <marex@...x.de>,
        Lucas Stach <l.stach@...gutronix.de>,
        Adam Ford-BE <aford@...conembedded.com>,
        Rob Herring <robh+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>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] arm64: dts: imx8mn: Add power-domain reference in USB controller

On Fri, Oct 23, 2020 at 4:55 AM Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> On Thu, Oct 22, 2020 at 10:08:07AM -0500, Adam Ford wrote:
> > The USB OTG controller cannot be used until the power-domain is enabled
> > unless it was started in the bootloader.
> >
> > Adding the power-domain reference to the OTG node allows the OTG
> > controller to operate.
> >
> > Signed-off-by: Adam Ford <aford173@...il.com>
> >
>
> I wonder, why your patches do not have usual Git trailer with summary of
> changes (after '---')?

I historically have just done 'git format-patch -pX'  but I haven't
seen complaints that the summary was missing.  I can add them going
forward.  Most of these individual patches have only touched single
files or created new files all together.

>
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mn.dtsi b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> > index 27733fbe87e9..605e6dbd2c6f 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
> > @@ -979,6 +979,7 @@ usbotg1: usb@...40000 {
> >                               assigned-clock-parents = <&clk IMX8MN_SYS_PLL2_500M>;
> >                               fsl,usbphy = <&usbphynop1>;
> >                               fsl,usbmisc = <&usbmisc1 0>;
> > +                             power-domains = <&pgc_otg1>;
>
> I guess you need it also for the usbphynop1 and usbmisc1.

>From what I can see looking at the IP blocks and the vendor's code
repo, only the usbotg IP block needs the power-domain to enable the
clocking going to it.  AFAICT, neither the usbphynop nor the usbmisc
are using clocks gated by the power-domain.
Thanks again for all your reviews.

adam
>
> Best regards,
> Krzysztof