linux-kernel - Re: [PATCH v2 2/3] dt-bindings: iio: adc: add bindings for mcp3911

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Date:   Wed, 25 Jul 2018 11:51:17 -0600
From:   Rob Herring <robh@...nel.org>
To:     Marcus Folkesson <marcus.folkesson@...il.com>
Cc:     Kent Gustavsson <kent@...oris.se>,
        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>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH v2 2/3] dt-bindings: iio: adc: add bindings for mcp3911

On Tue, Jul 24, 2018 at 08:30:03PM +0200, Marcus Folkesson wrote:
> MCP3911 is a dual channel Analog Front End (AFE) containing two
> synchronous sampling delta-sigma Analog-to-Digital Converters (ADC).
> 
> Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
> Signed-off-by: Kent Gustavsson <kent@...oris.se>
> ---
> 
> Notes:
>     v2:
>     	- drop channel width
>     	- drop `external_vref`
>     	- replace `external-clock` with proper clock bindings
> 
>  .../devicetree/bindings/iio/adc/mcp3911.txt        | 28 ++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/adc/mcp3911.txt
> 
> diff --git a/Documentation/devicetree/bindings/iio/adc/mcp3911.txt b/Documentation/devicetree/bindings/iio/adc/mcp3911.txt
> new file mode 100644
> index 000000000000..af5472f51a84
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/adc/mcp3911.txt
> @@ -0,0 +1,28 @@
> +* 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:
> + - device-addr: Device address when multiple MCP3911 chips are present on the
> +	same SPI bus. Valid values are 0-3. Defaults to 0.

Isn't this the reg value?

> + - vref-supply: Phandle to the external reference voltage supply.
> + - clocks: Phandle and clock identifier (see clock-names)
> + - clock-names: "adc_clk" for the ADC (sampling) clock

Datasheet calls this clki (or mclk internally). Or just drop clock-names 
as it is pointless 
when there is only 1 clock. 

Also DR handling as an IRQ is missing.