linux-kernel - Re: [PATCH] serial: tegra: remove Kconfig dependency on APB DMA controller

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Message-ID: <aSbikmpzkADKkna6@smile.fi.intel.com>
Date: Wed, 26 Nov 2025 13:20:50 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Francesco Lavra <flavra@...libre.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Kartik Rajput <kkartik@...dia.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Robert Marko <robert.marko@...tura.hr>,
	Thierry Bultel <thierry.bultel.yh@...renesas.com>,
	Douglas Anderson <dianders@...omium.org>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH] serial: tegra: remove Kconfig dependency on APB DMA
 controller

On Wed, Nov 26, 2025 at 10:07:59AM +0100, Francesco Lavra wrote:
> This driver runs also on SoCs without a Tegra20 APB DMA controller (e.g.
> Tegra234).
> Remove the Kconfig dependency on TEGRA20_APB_DMA, and remove reference to
> the APB DMA controller from the Kconfig help text.

...

>  	help
>  	  Support for the on-chip UARTs on the NVIDIA Tegra series SOCs
>  	  providing /dev/ttyTHS0, 1, 2, 3 and 4 (note, some machines may not
>  	  provide all of these ports, depending on how the serial port
> -	  are enabled). This driver uses the APB DMA to achieve higher baudrate
> -	  and better performance.
> +	  are enabled).

I think this removes a good piece of information. Perhaps rephrase?

	  This driver may use the APB DMA when available to achieve
	  higher baudrate and better performance.

-- 
With Best Regards,
Andy Shevchenko