linux-kernel - Re: [PATCH v4 04/10] serial: bflb_uart: add Bouffalolab UART Driver

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Message-ID: <ZHdiSjajwbF3cKBK@xhacker>
Date:   Wed, 31 May 2023 23:05:46 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v4 04/10] serial: bflb_uart: add Bouffalolab UART Driver

On Wed, May 31, 2023 at 03:34:02PM +0100, Greg Kroah-Hartman wrote:
> On Wed, May 31, 2023 at 10:09:56PM +0800, Jisheng Zhang wrote:
> > On Tue, May 30, 2023 at 11:36:00AM +0100, Greg Kroah-Hartman wrote:
> > > On Thu, May 18, 2023 at 11:22:38PM +0800, Jisheng Zhang wrote:
> > > > Add the driver for Bouffalolab UART IP which is found in Bouffalolab
> > > > SoCs such as bl808.
> > > 
> > > New uarts are being created that are NOT 8250-like?  Why????
> > 
> > Hi,
> > 
> > I'm not sure I understand your meaning. I guess you mean writing the new
> > uart driver following 8250 style. And the latest example is
> > sunplus-uart.c, it can be used as an example how to write a 8250 style
> > driver for new non-8250 uart IP. 
> 
> No, I mean, "why are hardware designers creating new UARTs in 2023 that
> are NOT 8250-based"?  Why do they want to constantly reinvent the wheel?

haha, to be honest, I dunno the reason either. For me, the HW has been there
and is linux capable, I want to mainline its support.