linux-kernel - Re: [PATCH 2/3] arm64: dts: imx93: add dma support for lpuart[2..9]

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Message-ID: <CAOMZO5BBLXyn7zpmb-DKNgJhY9DDP5_TgLZzPGREt-V_curvDw@mail.gmail.com>
Date:   Wed, 23 Aug 2023 15:12:37 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Frank Li <Frank.Li@....com>
Cc:     clin@...e.com, conor+dt@...nel.org, devicetree@...r.kernel.org,
        eagle.zhou@....com, imx@...ts.linux.dev, joy.zou@....com,
        kernel@...gutronix.de, krzysztof.kozlowski+dt@...aro.org,
        leoyang.li@....com, linux-arm-kernel@...ts.infradead.org,
        linux-imx@....com, linux-kernel@...r.kernel.org,
        pierre.gondois@....com, robh+dt@...nel.org, s.hauer@...gutronix.de,
        shawnguo@...nel.org, shenwei.wang@....com, sherry.sun@....com
Subject: Re: [PATCH 2/3] arm64: dts: imx93: add dma support for lpuart[2..9]

Hi Frank,

On Wed, Aug 23, 2023 at 3:01 PM Frank Li <Frank.Li@....com> wrote:
>
> Add dma support for lpuart[2..9]. The lpuart1 is debug console.

LPUART1 is the debug console on a particular board, but nothing prevents someone
to design an imx93 board that has another LPUART port as the debug console.

I suggest enabling DMA for all ports. That's what we do with other i.MX devices.

By the way, the fsl_lpuart driver disables DMA for the console:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/tty/serial/fsl_lpuart.c?h=v6.5-rc7#n1696