Re: [PATCH v3 06/11] dt-bindings: serial: 8250: Add SpacemiT K1 uart compatible

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> From: "Yixun Lan"<dlan@xxxxxxxxxx>
> Date:  Fri, Jul 5, 2024, 14:47
> Subject:  Re: [PATCH v3 06/11] dt-bindings: serial: 8250: Add SpacemiT K1 uart compatible
> To: "Jisheng Zhang"<jszhang@xxxxxxxxxx>
> Cc: "Rob Herring"<robh@xxxxxxxxxx>, "Krzysztof Kozlowski"<krzk+dt@xxxxxxxxxx>, "Conor Dooley"<conor+dt@xxxxxxxxxx>, "Conor Dooley"<conor@xxxxxxxxxx>, "Paul Walmsley"<paul.walmsley@xxxxxxxxxx>, "Palmer Dabbelt"<palmer@xxxxxxxxxxx>, "Albert Ou"<aou@xxxxxxxxxxxxxxxxx>, "Daniel Lezcano"<daniel.lezcano@xxxxxxxxxx>, "Thomas Gleixner"<tglx@xxxxxxxxxxxxx>, "Samuel Holland"<samuel.holland@xxxxxxxxxx>, "Anup Patel"<anup@xxxxxxxxxxxxxx>, "Greg Kroah-Hartman"<gregkh@xxxxxxxxxxxxxxxxxxx>, "Jiri Slaby"<jirislaby@xxxxxxxxxx>, "Lubomir Rintel"<lkundrak@xxxxx>, <devicetree@xxxxxxxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, "Yangyu Chen"<cyy@xxxxxxxxxxxx>, "Conor Dooley"<conor.dooley@xxxxxxxxxxxxx>, "Inochi Amaoto"<inochiama@xxxxxxxxxxx>, <linux-serial@xxxxxxxxxxxxxxx>, <linux-riscv@xxxxxxxxxxxxxxxxxxx>, "Meng Zhang"<zhangmeng.kevin@xxxxxxxxxxxx>
> On 22:03 Thu 04 Jul     , Jisheng Zhang wrote:
> > On Wed, Jul 03, 2024 at 02:55:09PM +0000, Yixun Lan wrote:
> > > Found SpacemiT's K1 uart controller is compatible with
> > > Intel's Xscale uart, but it's still worth to introduce a new compatible.
>
> > Per vendor's kernel source code, all the uarts support 64Bytes FIFO.
> > So if it's compatible with Xscale, it's a xscale uart 64 Bytes FIFO.
> yes, I agree
> 
> further question would how to implement specific support for spacemit's k1 SoC
> one possible option to add a PORT_SPACEMIT compatible data to 8250_port.c - uart_config[]
> 
> 
> > >From this PoV, the uart isn't a Xscale but a mrvl pxa.
> see my previous comment, probably need further clarification/investigation..
> 
>
> > But I have one question: is the uart really a mrvl/intel pxa uart? or is just
> No, I'm unable to answer this, I'm not an employee of SpacemiT
> All informations are based on public available source + docs..
> 
> > reg programming compatible with pxa?
>
> To my knowledge, it's compatible with pxa, but it would be great that vendor can clarify this
Yes, the programming model is compatible with pxa.
> 
> > > 
> > > Acked-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
> > > Signed-off-by: Yixun Lan <dlan@xxxxxxxxxx>
> > > ---
> > >  Documentation/devicetree/bindings/serial/8250.yaml | 4 +++-
> > >  1 file changed, 3 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/serial/8250.yaml b/Documentation/devicetree/bindings/serial/8250.yaml
> > > index 692aa05500fd5..0bde2379e8647 100644
> > > --- a/Documentation/devicetree/bindings/serial/8250.yaml
> > > +++ b/Documentation/devicetree/bindings/serial/8250.yaml
> > > @@ -111,7 +111,9 @@ properties:
> > >                - mediatek,mt7623-btif
> > >            - const: mediatek,mtk-btif
> > >        - items:
> > > -          - const: mrvl,mmp-uart
> > > +          - enum:
> > > +              - mrvl,mmp-uart
> > > +              - spacemit,k1-uart
> > >            - const: intel,xscale-uart
> > >        - items:
> > >            - enum:
> > > 
> > > -- 
> > > 2.45.2
> > > 
> > > 
> > > _______________________________________________
> > > linux-riscv mailing list
> > > linux-riscv@xxxxxxxxxxxxxxxxxxx
> > > http://lists.infradead.org/mailman/listinfo/linux-riscv
> 
> -- 
> Yixun Lan (dlan)
> Gentoo Linux Developer
> GPG Key ID AABEFD55


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