linux-kernel - Re: [PATCH v2] dt-bindings: serial: brcm,bcm2835-aux-uart: convert to dtschema

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Message-ID: <20240417-cornbread-grass-01fef5866624@spud>
Date: Wed, 17 Apr 2024 16:30:36 +0100
From: Conor Dooley <conor@...nel.org>
To: Pratik Farkase <pratikfarkase94@...il.com>
Cc: Pratik Farkase <pratik.farkase@...sweden.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
	Stefan Wahren <wahrenst@....net>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] dt-bindings: serial: brcm,bcm2835-aux-uart: convert
 to dtschema

On Wed, Apr 17, 2024 at 05:19:18PM +0200, Pratik Farkase wrote:
> On Wed, Apr 17, 2024 at 4:54 PM Conor Dooley <conor@...nel.org> wrote:
> >
> > On Wed, Apr 17, 2024 at 03:51:10PM +0200, Pratik Farkase wrote:
> > > Convert the Broadcom BCM2835 Auxiliary UART to newer DT schema.
> > > Created DT schema based on the .txt file which had
> > > `compatible`, `reg` `clocks` and `interrupts` as the
> > > required properties. This binding is used by Broadcom BCM2835
> > > SOC used in some Raspberry PI boards.
> > > Changes from original file:
> > > Implemented complete example which the original txt binding lacked.
> > >
> > > Signed-off-by: Pratik Farkase <pratik.farkase@...sweden.com>
> > > ---
> > > Changes in v2
> > > - Updated Maintainers list according to feedback
> > > - Fixed typo `Auxiliar` to `Auxiliary`
> > > ---
> > > ---
> > >  .../bindings/serial/brcm,bcm2835-aux-uart.txt | 18 -------
> > >  .../serial/brcm,bcm2835-aux-uart.yaml         | 48 +++++++++++++++++++
> > >  2 files changed, 48 insertions(+), 18 deletions(-)
> > >  delete mode 100644 Documentation/devicetree/bindings/serial/brcm,bcm2835-aux-uart.txt
> > >  create mode 100644 Documentation/devicetree/bindings/serial/brcm,bcm2835-aux-uart.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/serial/brcm,bcm2835-aux-uart.txt b/Documentation/devicetree/bindings/serial/brcm,bcm2835-aux-uart.txt
> > > deleted file mode 100644
> > > index b5cc6297cd1b..000000000000
> > > --- a/Documentation/devicetree/bindings/serial/brcm,bcm2835-aux-uart.txt
> > > +++ /dev/null
> > > @@ -1,18 +0,0 @@
> > > -* BCM2835 AUXILIAR UART
> > > -
> > > -Required properties:
> > > -
> > > -- compatible: "brcm,bcm2835-aux-uart"
> > > -- reg: The base address of the UART register bank.
> > > -- interrupts: A single interrupt specifier.
> > > -- clocks: Clock driving the hardware; used to figure out the baud rate
> > > -  divisor.
> > > -
> > > -Example:
> > > -
> > > -     uart1: serial@...15040 {
> > > -             compatible = "brcm,bcm2835-aux-uart";
> > > -             reg = <0x7e215040 0x40>;
> > > -             interrupts = <1 29>;
> > > -             clocks = <&aux BCM2835_AUX_CLOCK_UART>;
> > > -     };
> > > diff --git a/Documentation/devicetree/bindings/serial/brcm,bcm2835-aux-uart.yaml b/Documentation/devicetree/bindings/serial/brcm,bcm2835-aux-uart.yaml
> > > new file mode 100644
> > > index 000000000000..5d4d37371d6b
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/serial/brcm,bcm2835-aux-uart.yaml
> > > @@ -0,0 +1,48 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/serial/brcm,bcm2835-aux-uart.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: BCM2835 AUXILIARY UART
> > > +
> > > +maintainers:
> > > +  - Pratik Farkase <pratikfarkase94@...il.com>
> > > +  - Florian Fainelli <florian.fainelli@...adcom.com>
> > > +  - Stefan Wahren <wahrenst@....net>
> > > +
> > > +allOf:
> > > +  - $ref: serial.yaml
> > > +
> > > +properties:
> > > +  compatible:
> > > +    const: brcm,bcm2835-aux-uart
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  interrupts:
> > > +    maxItems: 1
> > > +
> > > +  clocks:
> > > +    maxItems: 1
> > > +
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +  - interrupts
> > > +  - clocks
> > > +
> > > +unevaluatedProperties: false
> > > +
> > > +examples:
> > > +  - |
> > > +    #include <dt-bindings/clock/bcm2835.h>
> > > +    #include <dt-bindings/clock/bcm2835-aux.h>
> > > +    #include <dt-bindings/interrupt-controller/irq.h>
> >
> > Only 1 of these headers seems used, there's only one define below.
> >
> > > +    uart1: serial@...15040 {
> >
> > The label is unused and can be dropped.
> I did not understand this part. What do you suggest i change it into?
> I took the example from original dtsi file:
> arch/arm/boot/dts/broadcom/bcm283x.dtsi

s/uart1: //
The "uart1" part is a label. The dtsi needs it so that the &uart1 syntax
can be used from a dts file to set properties etc, but that's no
required in bindings where there are no references to the node, so we
remove them.

Hope that helps,
Conor.

> >
> > Otherwise,
> > Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

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