linux-kernel - Re: [PATCH 3/4] serial: 8250: Add Aspeed UART driver

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Date:   Fri, 10 Feb 2023 15:52:03 +0200 (EET)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Chia-Wei Wang <chiawei_wang@...eedtech.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        joel@....id.au, andrew@...id.au, Jiri Slaby <jirislaby@...nel.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, LKML <linux-kernel@...r.kernel.org>,
        openbmc@...ts.ozlabs.org
Subject: Re: [PATCH 3/4] serial: 8250: Add Aspeed UART driver

On Fri, 10 Feb 2023, Chia-Wei Wang wrote:

> Add the driver for Aspeed UART/VUART devices, which are 16550A
> compatible. It is an wrapper to cover the generic 16550A operation
> while exetending DMA feature for the devices.
> 
> Signed-off-by: Chia-Wei Wang <chiawei_wang@...eedtech.com>
> ---
>  drivers/tty/serial/8250/8250_aspeed.c | 502 ++++++++++++++++++++++++++
>  drivers/tty/serial/8250/Kconfig       |   8 +
>  drivers/tty/serial/8250/Makefile      |   1 +

Hi,

Before I look any further into this, could you please explain why this is 
made to be entirely separate from what we have in 
  drivers/tty/serial/8250/8250_aspeed_vuart.c
?

I quickly went through some functions and they've significant parts in 
common with no variations at all in many functions and you're defines 
are 1:1 too (except for the DMA buf sizes). It would seem much better to 
add the missing functionality into 8250_aspeed_vuart.c rather than 
creating something from scratch with large overlap with existing code.

If you intend to keep it as a separate one, you should have a rather good 
justification for it.

-- 
 i.