linux-kernel - Re: [PATCH v4 2/3] dt-bindings: sc16is7xx: Add compatible line for XR20M1172 UART

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Date: Fri, 19 Apr 2024 17:17:43 +0300
From: "Konstantin P." <ria.freelander@...il.com>
To: Conor Dooley <conor@...nel.org>
Cc: Konstantin Pugin <rilian.la.te@...ru>, Vladimir Zapolskiy <vz@...ia.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jirislaby@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Hugo Villeneuve <hvilleneuve@...onoff.com>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
	Lech Perczak <lech.perczak@...lingroup.com>, 
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org, 
	linux-serial@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 2/3] dt-bindings: sc16is7xx: Add compatible line for
 XR20M1172 UART

On Fri, Apr 19, 2024 at 5:08 PM Conor Dooley <conor@...nel.org> wrote:
>
> On Fri, Apr 19, 2024 at 03:45:02PM +0300, Konstantin Pugin wrote:
> > From: Konstantin Pugin <ria.freelander@...il.com>
> >
> > Add EXAR XR20M1172 UART compatible line into devicetree documentation.
>
> What you're doing is obvious from the diff, why this exar device is
> related to the nxp devices is what should be mentioned here.
>
> Thanks,
> Conor.

It is already mentioned in cover letter and in previous patches in the
series. Do I need to repeat it in DTS patch?
If so, I will do it.

Citation from my cover letter:

EXAR XR20M1172 UART is mostly SC16IS762-compatible, but
it has additional register which can change UART multiplier
to 4x and 8x, similar to UPF_MAGIC_MULTIPLIER does. So, I used this
flag to guard access to its specific DLD register. It seems than
other EXAR SPI UART modules also have this register, but I tested
only XR20M1172.
Yes, in datasheet this register is called "DLD - Divisor Fractional"
or "DLD - Divisor Fractional Register", calling depends on datasheet
version.

Also, comparision from NXP itself:
http://www.bdtic.com/download/nxp/75017168.pdf (pp12-13 is about XR20M1172).

> >
> > Reviewed-by: Vladimir Zapolskiy <vz@...ia.com>
> > Signed-off-by: Konstantin Pugin <ria.freelander@...il.com>
> > ---
> >  Documentation/devicetree/bindings/serial/nxp,sc16is7xx.yaml | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.yaml b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.yaml
> > index 5dec15b7e7c3..c4bedf23368b 100644
> > --- a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.yaml
> > +++ b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.yaml
> > @@ -12,6 +12,7 @@ maintainers:
> >  properties:
> >    compatible:
> >      enum:
> > +      - exar,xr20m1172
> >        - nxp,sc16is740
> >        - nxp,sc16is741
> >        - nxp,sc16is750
> > --
> > 2.34.1
> >