linux-kernel - Re: [PATCH] arm64: dts: imx8mp: drop dmas property for uart console

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Message-ID: <CAGETcx-_nwrzJzaY3yc80g4AfydV5J9-JYE5h1m+5TT05jyKOw@mail.gmail.com>
Date:   Thu, 23 Jun 2022 11:58:02 -0700
From:   Saravana Kannan <saravanak@...gle.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Sascha Hauer <s.hauer@...gutronix.de>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        NXP Linux Team <linux-imx@....com>, hvilleneuve@...onoff.com,
        Lucas Stach <l.stach@...gutronix.de>,
        abbaraju.manojsai@...rulasolutions.com,
        Jagan Teki <jagan@...rulasolutions.com>,
        Matteo Lisi <matteo.lisi@...icam.com>,
        Tim Harvey <tharvey@...eworks.com>,
        Teresa Remmet <t.remmet@...tec.de>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, t.remmet@...tec.deh,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH] arm64: dts: imx8mp: drop dmas property for uart console

On Thu, Jun 23, 2022 at 11:43 AM Fabio Estevam <festevam@...il.com> wrote:
>
> On Thu, Jun 23, 2022 at 3:26 PM Saravana Kannan <saravanak@...gle.com> wrote:
>
> > I don't think it'll be hard to fix the console= case either. In the
> > case where you are not using stdout-path, how are you setting the
> > console? Just want to make sure I'm handling that case too.
>
> When stdout-path is not passed in DT, then the bootloader needs to pass
> console=ttymxc0,115200, for example.
>
> Please copy me in v3 if you send it.

Will do. I'm looking at the serial console code and I don't see a
difference between earlycon= vs console= handling. And I know that
earlycon= doesn't go through the driver core and isn't affected by any
of this. If you have additional pointers on where console= is parsed,
feel free to pass it on. I'll continue poking at this.

-Saravana