linux-kernel - Re: [PATCH v2 1/5] dt-bindings: input: Add binding for bma150 sensor

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Message-ID: <20190218191850.GA31221@bogus>
Date:   Mon, 18 Feb 2019 13:18:50 -0600
From:   Rob Herring <robh@...nel.org>
To:     Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
Cc:     dmitry.torokhov@...il.com, mark.rutland@....com, xc-racer2@...e.ca,
        devicetree@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] dt-bindings: input: Add binding for bma150 sensor

On Sat, Feb 02, 2019 at 04:18:02PM +0100, Paweł Chmiel wrote:
> From: Jonathan Bakker <xc-racer2@...e.ca>
> 
> Add device tree bindings for Bosch BMA150 Accelerometer Sensor
> 
> Changes from v1:
>  - Add properties for all of bma150_cfg
>  - Correct IRQ type in example
> 
> Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
> Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>
> ---
>  .../bindings/input/bosch,bma150.txt           | 38 +++++++++++++++++++
>  include/dt-bindings/input/bma150.h            | 22 +++++++++++
>  include/linux/bma150.h                        | 13 +------
>  3 files changed, 62 insertions(+), 11 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/input/bosch,bma150.txt
>  create mode 100644 include/dt-bindings/input/bma150.h
> 
> diff --git a/Documentation/devicetree/bindings/input/bosch,bma150.txt b/Documentation/devicetree/bindings/input/bosch,bma150.txt
> new file mode 100644
> index 000000000000..f644d132f79c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/bosch,bma150.txt
> @@ -0,0 +1,38 @@
> +* Bosch BMA150 Accelerometer Sensor
> +
> +Also works for the SMB380 and BMA023 accelerometers
> +
> +Required properties:
> +- compatible : Should be "bosch,bma150"
> +- reg : The I2C address of the sensor
> +
> +Optional properties:
> +- interrupt-parent : should be the phandle for the interrupt controller

This is implied and can be dropped.

> +- interrupts : Interrupt mapping for IRQ.  If not present device will be polled

> +- any-motion-int : bool for if the any motion interrupt should be enabled
> +- hg-int : bool for if the high-G interrupt should be enabled
> +- lg-int : bool for if the low-G interrupt should be enabled
> +- any-motion-cfg : array of integers for any motion duration and threshold
> +- hg-cfg : array of integers for high-G hysterisis, duration, and threshold
> +- lg-cfg : array of integers for low-G hysterisis, duration, and threshold
> +- range : configuration of range, one of BMA150_RANGE_* as defined in [1]
> +- bandwidth : refresh rate of device, one of BMA150_BW_* as defined in [1]

These all need vendor prefixes if they stay.

What determines all this configuration? It seems like a user may want to 
change at run-time in which case sysfs would be more appropriate.

I don't recall seeing other accelerometers with these, but seems these 
could apply to other accelerometers. In which case, they should be 
common.

> +
> +Example:
> +
> +bma150@38 {

accelerometer@38

> +	compatible = "bosch,bma150";
> +	reg = <0x38>;
> +	interrupt-parent = <&gph0>;
> +	interrupts = <1 IRQ_TYPE_EDGE_RISING>;
> +	any-motion-int;
> +	hg-int;
> +	lg-int;
> +	any-motion-cfg = <0 0>;
> +	hg-cfg = <0 150 160>;
> +	lg-cfg = <0 150 20>;
> +	range = <BMA150_RANGE_2G>;
> +	bandwidth = <BMA150_BW_50HZ>;
> +};
> +
> +[1] include/dt-bindings/input/bma150.h
> diff --git a/include/dt-bindings/input/bma150.h b/include/dt-bindings/input/bma150.h
> new file mode 100644
> index 000000000000..fb38ca787f0f
> --- /dev/null
> +++ b/include/dt-bindings/input/bma150.h
> @@ -0,0 +1,22 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * This header provides bindings for the BMA150 accelerometer
> + */
> +#ifndef _DT_BINDINGS_INPUT_BMA150_H
> +#define _DT_BINDINGS_INPUT_BMA150_H
> +
> +/* Range */
> +#define BMA150_RANGE_2G		0
> +#define BMA150_RANGE_4G		1
> +#define BMA150_RANGE_8G		2
> +
> +/* Refresh rate */
> +#define BMA150_BW_25HZ		0
> +#define BMA150_BW_50HZ		1
> +#define BMA150_BW_100HZ		2
> +#define BMA150_BW_190HZ		3
> +#define BMA150_BW_375HZ		4
> +#define BMA150_BW_750HZ		5
> +#define BMA150_BW_1500HZ	6
> +
> +#endif /* _DT_BINDINGS_INPUT_BMA150_H */
> diff --git a/include/linux/bma150.h b/include/linux/bma150.h
> index 97ade7cdc870..b85266a9c35c 100644
> --- a/include/linux/bma150.h
> +++ b/include/linux/bma150.h
> @@ -20,19 +20,10 @@
>  #ifndef _BMA150_H_
>  #define _BMA150_H_
>  
> -#define BMA150_DRIVER		"bma150"
> +#include <dt-bindings/input/bma150.h>
>  
> -#define BMA150_RANGE_2G		0
> -#define BMA150_RANGE_4G		1
> -#define BMA150_RANGE_8G		2
> +#define BMA150_DRIVER		"bma150"
>  
> -#define BMA150_BW_25HZ		0
> -#define BMA150_BW_50HZ		1
> -#define BMA150_BW_100HZ		2
> -#define BMA150_BW_190HZ		3
> -#define BMA150_BW_375HZ		4
> -#define BMA150_BW_750HZ		5
> -#define BMA150_BW_1500HZ	6
>  
>  struct bma150_cfg {
>  	bool any_motion_int;		/* Set to enable any-motion interrupt */
> -- 
> 2.17.1
>