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

[Andy Shevchenko]

On Wed, Nov 26, 2025 at 01:08:23PM +0100, Francesco Lavra wrote:
> On Wed, 2025-11-26 at 13:20 +0200, Andy Shevchenko wrote:
> > On Wed, Nov 26, 2025 at 10:07:59AM +0100, Francesco Lavra wrote:

...

> > >         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.
> 
> I think this sentence would make it sound like the driver performs better
> if the APB DMA controller is available, but in reality the driver just uses
> the generic DMA API like most serial drivers, and there is nothing APB-
> specific in it. If another DMA controller (e.g. GPC on Tegra234) is
> available instead of the APB one, the serial peripheral will be just as
> fast.

OK. But this is not the case for Tegra234? Or is it and it uses DMA for UART?

-- 
With Best Regards,
Andy Shevchenko