linux-kernel - Re: [PATCH v1 0/9] riscv: add initial support for SpacemiT K1

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Date: Tue, 18 Jun 2024 01:42:34 +0800
From: Yangyu Chen <cyy@...self.name>
To: Conor Dooley <conor@...nel.org>
Cc: Jisheng Zhang <jszhang@...nel.org>,
 Yixun Lan <dlan@...too.org>,
 linux-riscv@...ts.infradead.org,
 Conor Dooley <conor+dt@...nel.org>,
 Palmer Dabbelt <palmer@...belt.com>,
 Paul Walmsley <paul.walmsley@...ive.com>,
 Samuel Holland <samuel.holland@...ive.com>,
 Anup Patel <anup.patel@....com>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 devicetree@...r.kernel.org,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 Jesse Taube <jesse@...osinc.com>
Subject: Re: [PATCH v1 0/9] riscv: add initial support for SpacemiT K1



> On Jun 18, 2024, at 01:14, Conor Dooley <conor@...nel.org> wrote:
> 
> On Tue, Jun 18, 2024 at 12:39:30AM +0800, Yangyu Chen wrote:
>> 
>> The vendor uses a special intel pxa uart driver, marked deprecated
>> in the kernel and incompatible with ns16550. If we use ns16550 in
>> the dt, the behavior of uart is like the uart has no interrupt and
>> stops working permanently when fifo overruns, making many developers
>> not know how to start unless they use the SBI HVC console, which
>> needs to turn on CONFIG_NONPORTABLE.
> 
> This I just do not understand. Why did they use this IP? Is it free?
> Did they use it before for something else? It's a rather strange design
> choice to me.

I don't know either. However, PXA is a subfamily of XScale. The
kernel also probed the UART as an XScale. So, using XScale compatible
string is OK.