RE: [PATCH 02/19] dt-bindings: serial: rsci: Drop "uart-has-rtscts: false"

[Biju Das]

Hi Conor Dooley,

> -----Original Message-----
> From: Conor Dooley <conor@xxxxxxxxxx>
> Sent: 28 October 2025 19:28
> Subject: Re: [PATCH 02/19] dt-bindings: serial: rsci: Drop "uart-has-rtscts: false"
> 
> On Mon, Oct 27, 2025 at 03:45:49PM +0000, Biju Das wrote:
> > Drop "uart-has-rtscts: false" from binding as the IP support hardware
> > flow control.
> 
> Why is it being removed, rather than only being required for the existing devices? It's not clear to
> me that the comment about the IP supporting flow control excludes the integration on these particular
> devices from somehow having flow control disabled.

It was a mistake previously as the driver does not implement hardware flow control and
is excluded in device tree.

Actually, the RSCI IP on all SoCs supports hardware flow control.
If a channel need flow control it can make use of the property uart-has-rtscts;
That is the reason for removing hardware flow control disabled property("uart-has-rtscts: false")


Cheers,
Biju



> 
> >
> > Signed-off-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
> > ---
> >  Documentation/devicetree/bindings/serial/renesas,rsci.yaml | 2 --
> >  1 file changed, 2 deletions(-)
> >
> > diff --git
> > a/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
> > b/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
> > index f50d8e02f476..6b1f827a335b 100644
> > --- a/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
> > +++ b/Documentation/devicetree/bindings/serial/renesas,rsci.yaml
> > @@ -54,8 +54,6 @@ properties:
> >    power-domains:
> >      maxItems: 1
> >
> > -  uart-has-rtscts: false
> > -
> >  required:
> >    - compatible
> >    - reg
> > --
> > 2.43.0
> >