linux-kernel - Re: [RFC PATCH v2 1/2] dt-bindings: sc16is7xx: Add property to change GPIO function

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Message-Id: <20230524233716.b433edc0fe4afc519976bcea@hugovil.com>
Date:   Wed, 24 May 2023 23:37:16 -0400
From:   Hugo Villeneuve <hugo@...ovil.com>
To:     Lech Perczak <lech.perczak@...lingroup.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-gpio@...r.kernel.org,
        Hugo Villeneuve <hvilleneuve@...onoff.com>,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/2] dt-bindings: sc16is7xx: Add property to
 change GPIO function

On Fri, 19 May 2023 15:03:37 +0200
Lech Perczak <lech.perczak@...lingroup.com> wrote:

> Hello Hugo,
> 
> W dniu 18.05.2023 o 15:29, Hugo Villeneuve pisze:
> > From: Hugo Villeneuve <hvilleneuve@...onoff.com>
> >
> > Some variants in this series of uart controllers have GPIO pins that
> > are shared between GPIO and modem control lines.
> >
> > The pin mux mode (GPIO or modem control lines) can be set for each
> > ports (channels) supported by the variant.
> >
> > This adds a property to the device tree to set the GPIO pin mux to
> > modem control lines on selected ports if needed.
> >
> > Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
> > ---
> > v1 -> v2: Add nxp vendor prefix
> >           Add git base-commit
> >
> >  .../bindings/serial/nxp,sc16is7xx.txt         | 28 +++++++++++++++++++
> >  1 file changed, 28 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
> > index 0fa8e3e43bf8..23a81c83f012 100644
> > --- a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
> > +++ b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
> > @@ -23,6 +23,9 @@ Optional properties:
> >      1 = active low.
> >  - irda-mode-ports: An array that lists the indices of the port that
> >                    should operate in IrDA mode.
> > +- nxp,modem-control-line-ports: An array that lists the indices of the port that
> > +                               should have shared GPIO lines configured as modem
> > +                               control lines.
> >
> >  Example:
> >          sc16is750: sc16is750@51 {
> > @@ -35,6 +38,17 @@ Example:
> >                  #gpio-cells = <2>;
> >          };
> >
> > +       sc16is752: sc16is752@54 {
> > +               compatible = "nxp,sc16is752";
> > +               reg = <0x54>;
> > +               clocks = <&clk20m>;
> > +               interrupt-parent = <&gpio3>;
> > +               interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
> > +               nxp,modem-control-line-ports = <1>; /* Port 1 as modem control lines */
> > +               gpio-controller; /* Port 0 as GPIOs */
> > +               #gpio-cells = <2>;
> > +       };
> > +
> >  * spi as bus
> >
> >  Required properties:
> > @@ -59,6 +73,9 @@ Optional properties:
> >      1 = active low.
> >  - irda-mode-ports: An array that lists the indices of the port that
> >                    should operate in IrDA mode.
> > +- nxp,modem-control-line-ports: An array that lists the indices of the port that
> > +                               should have shared GPIO lines configured as modem
> > +                               control lines.
> >
> >  Example:
> >         sc16is750: sc16is750@0 {
> > @@ -70,3 +87,14 @@ Example:
> >                 gpio-controller;
> >                 #gpio-cells = <2>;
> >         };
> > +
> > +       sc16is752: sc16is752@0 {
> > +               compatible = "nxp,sc16is752";
> > +               reg = <0>;
> > +               clocks = <&clk20m>;
> > +               interrupt-parent = <&gpio3>;
> > +               interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
> > +               nxp,modem-control-line-ports = <1>; /* Port 1 as modem control lines */
> Just a minor nitpick: an example showing syntax for both ports would be great.
> This can be included here, leaving the previous example intact. Otherwise, LGTM.
> > +               gpio-controller; /* Port 0 as GPIOs */
> > +               #gpio-cells = <2>;

Hi,
I have decided to add a separate example, because adding an example for both ports also means that the gpio-controller property should be removed.

Hugo.


> > +       };
> >
> > base-commit: 4d6d4c7f541d7027beed4fb86eb2c451bd8d6fff
> > --
> > 2.30.2
> 
> -- 
> Pozdrawiam/With kind regards,
> Lech Perczak
> 
> Sr. Software Engineer
> Camlin Technologies Poland Limited Sp. z o.o.
> Strzegomska 54,
> 53-611 Wroclaw
> Tel:     (+48) 71 75 000 16
> Email:   lech.perczak@...lingroup.com
> Website: http://www.camlingroup.com
> 
>