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Date: Wed, 6 Nov 2019 08:49:35 +0100
From: Marcus Folkesson <marcus.folkesson@...il.com>
To: Rob Herring <robh@...nel.org>
Cc: Jonathan Cameron <jic23@...nel.org>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
Mark Rutland <mark.rutland@....com>,
Kent Gustavsson <kent@...oris.se>,
Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
"David S . Miller" <davem@...emloft.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Paul E . McKenney" <paulmck@...ux.ibm.com>,
linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: iio: adc: Migrate MCP3911 documentation to
yaml
Hi Rob,
Thank you for comment. See inline comments.
I will apply the changes to this pending patch as well.
Subject: [PATCH] dt-bindings: iio: dac: Migrate LTC1660 documentation to yaml
On Tue, Nov 05, 2019 at 09:49:20PM -0600, Rob Herring wrote:
> On Tue, Oct 29, 2019 at 10:11:42PM +0100, Marcus Folkesson wrote:
> > Rewrite bindings to use json-schema vocabulary.
> >
> > Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
> > ---
> > .../devicetree/bindings/iio/adc/mcp3911.txt | 30 --------
> > .../bindings/iio/adc/microchip,mcp3911.yaml | 72 +++++++++++++++++++
> > MAINTAINERS | 2 +-
> > 3 files changed, 73 insertions(+), 31 deletions(-)
> > delete mode 100644 Documentation/devicetree/bindings/iio/adc/mcp3911.txt
> > create mode 100644 Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/iio/adc/mcp3911.txt b/Documentation/devicetree/bindings/iio/adc/mcp3911.txt
> > deleted file mode 100644
> > index 3071f48fb30b..000000000000
> > --- a/Documentation/devicetree/bindings/iio/adc/mcp3911.txt
> > +++ /dev/null
> > @@ -1,30 +0,0 @@
> > -* Microchip MCP3911 Dual channel analog front end (ADC)
> > -
> > -Required properties:
> > - - compatible: Should be "microchip,mcp3911"
> > - - reg: SPI chip select number for the device
> > -
> > -Recommended properties:
> > - - spi-max-frequency: Definition as per
> > - Documentation/devicetree/bindings/spi/spi-bus.txt.
> > - Max frequency for this chip is 20MHz.
> > -
> > -Optional properties:
> > - - clocks: Phandle and clock identifier for sampling clock
> > - - interrupt-parent: Phandle to the parent interrupt controller
> > - - interrupts: IRQ line for the ADC
> > - - microchip,device-addr: Device address when multiple MCP3911 chips are present on the
> > - same SPI bus. Valid values are 0-3. Defaults to 0.
> > - - vref-supply: Phandle to the external reference voltage supply.
> > -
> > -Example:
> > -adc@0 {
> > - compatible = "microchip,mcp3911";
> > - reg = <0>;
> > - interrupt-parent = <&gpio5>;
> > - interrupts = <15 IRQ_TYPE_EDGE_RISING>;
> > - spi-max-frequency = <20000000>;
> > - microchip,device-addr = <0>;
> > - vref-supply = <&vref_reg>;
> > - clocks = <&xtal>;
> > -};
> > diff --git a/Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml b/Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml
> > new file mode 100644
> > index 000000000000..bfcf6a5fb44e
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml
> > @@ -0,0 +1,72 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +# Copyright 2019 Marcus Folkesson <marcus.folkesson@...il.com>
> > +%YAML 1.2
> > +---
> > +$id: "http://devicetree.org/schemas/bindings/iio/adc/microchip,mcp3911.yaml#"
> > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> > +
> > +title: Microchip MCP3911 Dual channel analog front end (ADC)
> > +
> > +maintainers:
> > + - Marcus Folkesson <marcus.folkesson@...il.com>
> > + - Kent Gustavsson <nedo80@...il.com>
> > +
> > +description: |
> > + Bindings for the Microchip MCP3911 Dual channel ADC device. Datasheet can be
> > + found here: https://ww1.microchip.com/downloads/en/DeviceDoc/20002286C.pdf
> > +
> > +properties:
> > + compatible:
> > + enum:
> > + - microchip,mcp3911
> > +
> > + reg:
> > + description: SPI chip select number for the device
>
> No need to describe common properties if you have nothing special for
> this device to say.
>
OK
> > + maxItems: 1
> > +
> > + spi-max-frequency:
> > + description: |
> > + Definition as per Documentation/devicetree/bindings/spi/spi-bus.txt.
>
> Same here.
>
> > + maximum: 20000000
> > + maxItems: 1
Should I keep the maximum property?
>
> Not an array, so drop.
>
> > +
> > + clocks:
> > + description: Phandle and clock identifier for sampling clock
>
> Same comment on descriptions.
>
I describe it a little bit more. Thanks
> > + maxItems: 1
> > +
> > + interrupts:
> > + description: IRQ line of the ADC
> > + maxItems: 1
> > +
> > + microchip,device-addr:
> > + description: Device address when multiple MCP3911 chips are present on the same SPI bus.
> > + allOf:
> > + - $ref: /schemas/types.yaml#/definitions/uint32
> > + - enum: [0, 1, 2, 3]
> > + - default: 0
> > +
> > + vref-supply:
> > + description: Phandle to the external reference voltage supply.
> > + maxItems: 1
>
> Drop this *-supply is always 1 item.
>
OK
> > +
> > +required:
> > + - compatible
> > + - reg
> > +
> > +examples:
> > + - |
> > + spi {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + adc@0 {
> > + compatible = "microchip,mcp3911";
> > + reg = <0>;
> > + interrupt-parent = <&gpio5>;
> > + interrupts = <15 2>;
> > + spi-max-frequency = <20000000>;
> > + microchip,device-addr = <0>;
> > + vref-supply = <&vref_reg>;
> > + clocks = <&xtal>;
> > + };
> > + };
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index e51a68bf8ca8..fbccc9d450ff 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -10723,7 +10723,7 @@ M: Kent Gustavsson <kent@...oris.se>
> > L: linux-iio@...r.kernel.org
> > S: Supported
> > F: drivers/iio/adc/mcp3911.c
> > -F: Documentation/devicetree/bindings/iio/adc/mcp3911.txt
> > +F: Documentation/devicetree/bindings/iio/adc/microchip,mcp3911.yaml
> >
> > MICROCHIP NAND DRIVER
> > M: Tudor Ambarus <tudor.ambarus@...rochip.com>
> > --
> > 2.23.0
> >
Thanks,
Marcus Folkesson
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