linux-kernel - Re: [PATCH 1/2] dt-bindings: iio: pressure: Add support for Honeywell HSC SPI sensors

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Date:   Sun, 28 Oct 2018 17:38:42 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Carlos Iglesias <carlos.iglesias@...tex.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "knaack.h@....de" <knaack.h@....de>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Dan O'Donovan <dan.odonovan@...tex.com>
Subject: Re: [PATCH 1/2] dt-bindings: iio: pressure: Add support for
 Honeywell HSC SPI sensors

On Fri, 26 Oct 2018 18:14:36 +0000
Carlos Iglesias <carlos.iglesias@...tex.com> wrote:

> Add device tree bindings for the HSC pressure sensors.
> 
> Signed-off-by: Carlos Iglesias <carlos.iglesias@...tex.com>
> ---
>  .../bindings/iio/pressure/hsc_spi.txt         | 85 +++++++++++++++++++
>  1 file changed, 85 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/pressure/hsc_spi.txt
> 
> diff --git a/Documentation/devicetree/bindings/iio/pressure/hsc_spi.txt b/Documentation/devicetree/bindings/iio/pressure/hsc_spi.txt
> new file mode 100644
> index 000000000000..2302d6eef7c7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/pressure/hsc_spi.txt
> @@ -0,0 +1,85 @@
> +Honeywell HSC Series of Pressure Sensors
> +
> +Pressure sensors from Honeywell with analog, I2C and SPI interfaces
> +
> +Required properties:
> +- compatible: selects the sensor model; must be one of the following
> +	"honeywell,hsc001baa"
> +	"honeywell,hsc001bab"
> +	"honeywell,hsc001bac"
> +	"honeywell,hsc001baf"
> +	"honeywell,hsc1_6baa"
> +	"honeywell,hsc1_6bab"
> +	"honeywell,hsc1_6bac"
> +	"honeywell,hsc1_6baf"
> +	"honeywell,hsc2_5baa"
> +	"honeywell,hsc2_5bab"
> +	"honeywell,hsc2_5bac"
> +	"honeywell,hsc2_5baf"
> +	"honeywell,hsc004baa"
> +	"honeywell,hsc004bab"
> +	"honeywell,hsc004bac"
> +	"honeywell,hsc004baf"
> +	"honeywell,hsc006baa"
> +	"honeywell,hsc006bab"
> +	"honeywell,hsc006bac"
> +	"honeywell,hsc006baf"
> +	"honeywell,hsc010baa"
> +	"honeywell,hsc010bab"
> +	"honeywell,hsc010bac"
> +	"honeywell,hsc010baf"
> +	"honeywell,hsc100kaa"
> +	"honeywell,hsc100kab"
> +	"honeywell,hsc100kac"
> +	"honeywell,hsc100kaf"
> +	"honeywell,hsc160kaa"
> +	"honeywell,hsc160kab"
> +	"honeywell,hsc160kac"
> +	"honeywell,hsc160kaf"
> +	"honeywell,hsc250kaa"
> +	"honeywell,hsc250kab"
> +	"honeywell,hsc250kac"
> +	"honeywell,hsc250kaf"
> +	"honeywell,hsc400kaa"
> +	"honeywell,hsc400kab"
> +	"honeywell,hsc400kac"
> +	"honeywell,hsc400kaf"
> +	"honeywell,hsc600kaa"
> +	"honeywell,hsc600kab"
> +	"honeywell,hsc600kac"
> +	"honeywell,hsc600kaf"
> +	"honeywell,hsc001gaa"
> +	"honeywell,hsc001gab"
> +	"honeywell,hsc001gac"
> +	"honeywell,hsc001gaf"
> +	"honeywell,hsc015paa"
> +	"honeywell,hsc015pab"
> +	"honeywell,hsc015pac"
> +	"honeywell,hsc015paf"
> +	"honeywell,hsc030paa"
> +	"honeywell,hsc030pab"
> +	"honeywell,hsc030pac"
> +	"honeywell,hsc030paf"
> +	"honeywell,hsc060paa"
> +	"honeywell,hsc060pab"
> +	"honeywell,hsc060pac"
> +	"honeywell,hsc060paf"
> +	"honeywell,hsc100paa"
> +	"honeywell,hsc100pab"
> +	"honeywell,hsc100pac"
> +	"honeywell,hsc100paf"
> +	"honeywell,hsc150paa"
> +	"honeywell,hsc150pab"
> +	"honeywell,hsc150pac"
> +	"honeywell,hsc150paf"
> +- reg: the SPI chip select number used by the sensor.
> +- spi-max-frequency: maximum clock frequency (Hz) used for the SPI bus.
> +  The maximum value supported by the sensors is 400000.
As Rob pointed out in a few reviews this week, the devicetree binding
for this should only be applying a tighter bound than either the
device or the bus master. So something introduced by the board
layout for example, or a level convertor..

Jonathan
> +
> +Example:
> +
> +	hsc_spi0: hsc@0 {
> +		compatible = "honeywell,hsc010baa";
> +		reg = <0>;
> +		spi-max-frequency = <400000>;
> +	};