iio: st-sensors: Update ST Sensor bindings

This adjusts the ST Sensor bindings with the more fine-grained
syntax checks that were proposed late in the last kernel cycle
and colliding with parallel work.

Cc: devicetree@vger.kernel.org
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 .../bindings/iio/st,st-sensors.yaml           | 252 ++++++++++++------
 1 file changed, 174 insertions(+), 78 deletions(-)

On Mon,  4 Jan 2021 10:33:43 +0100
Linus Walleij <linus.walleij@linaro.org> wrote:

> This adjusts the ST Sensor bindings with the more fine-grained
> syntax checks that were proposed late in the last kernel cycle
> and colliding with parallel work.
> 
> Cc: devicetree@vger.kernel.org
> Reviewed-by: Rob Herring <robh@kernel.org>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Hi Linus,

Thanks for doing this.  A few really small things inline.

Jonathan

> ---
>  .../bindings/iio/st,st-sensors.yaml           | 252 ++++++++++++------
>  1 file changed, 174 insertions(+), 78 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/st,st-sensors.yaml b/Documentation/devicetree/bindings/iio/st,st-sensors.yaml
> index db291a9390b7..aba8dc4275a9 100644
> --- a/Documentation/devicetree/bindings/iio/st,st-sensors.yaml
> +++ b/Documentation/devicetree/bindings/iio/st,st-sensors.yaml
> @@ -6,7 +6,9 @@ $schema: http://devicetree.org/meta-schemas/core.yaml#
>  
>  title: STMicroelectronics MEMS sensors
>  
> -description: |
> +description: The STMicroelectronics sensor devices are pretty straight-forward
> +  I2C or SPI devices, all sharing the same device tree descriptions no matter
> +  what type of sensor it is.
>    Note that whilst this covers many STMicro MEMs sensors, some more complex
>    IMUs need their own bindings.
>    The STMicroelectronics sensor devices are pretty straight-forward I2C or
> @@ -15,89 +17,181 @@ description: |
>  
>  maintainers:
>    - Denis Ciocca <denis.ciocca@st.com>
> +  - Linus Walleij <linus.walleij@linaro.org>
>  
>  properties:
>    compatible:
> -    description: |
> -      Some values are deprecated.
> -      st,lis3lv02d (deprecated, use st,lis3lv02dl-accel)
> -      st,lis302dl-spi (deprecated, use st,lis3lv02dl-accel)
> -    enum:
> -        # Accelerometers
> -      - st,lis3lv02d
> -      - st,lis302dl-spi
> -      - st,lis3lv02dl-accel
> -      - st,lsm303dlh-accel
> -      - st,lsm303dlhc-accel
> -      - st,lis3dh-accel
> -      - st,lsm330d-accel
> -      - st,lsm330dl-accel
> -      - st,lsm330dlc-accel
> -      - st,lis331dl-accel
> -      - st,lis331dlh-accel
> -      - st,lsm303dl-accel
> -      - st,lsm303dlm-accel
> -      - st,lsm330-accel
> -      - st,lsm303agr-accel
> -      - st,lis2dh12-accel
> -      - st,h3lis331dl-accel
> -      - st,lng2dm-accel
> -      - st,lis3l02dq
> -      - st,lis2dw12
> -      - st,lis3dhh
> -      - st,lis3de
> -      - st,lis2de12
> -      - st,lis2hh12
> -        # Gyroscopes
> -      - st,l3g4200d-gyro
> -      - st,lsm330d-gyro
> -      - st,lsm330dl-gyro
> -      - st,lsm330dlc-gyro
> -      - st,l3gd20-gyro
> -      - st,l3gd20h-gyro
> -      - st,l3g4is-gyro
> -      - st,lsm330-gyro
> -      - st,lsm9ds0-gyro
> -        # Magnetometers
> -      - st,lsm303agr-magn
> -      - st,lsm303dlh-magn
> -      - st,lsm303dlhc-magn
> -      - st,lsm303dlm-magn
> -      - st,lis3mdl-magn
> -      - st,lis2mdl
> -      - st,lsm9ds1-magn
> -        # Pressure sensors
> -      - st,lps001wp-press
> -      - st,lps25h-press
> -      - st,lps331ap-press
> -      - st,lps22hb-press
> -      - st,lps33hw
> -      - st,lps35hw
> -      - st,lps22hh
> +    oneOf:
> +      - description: STMicroelectronics Accelerometers
> +        enum:
> +          - st,h3lis331dl-accel
> +          - st,lis2de12
> +          - st,lis2dw12
> +          - st,lis2hh12
> +          - st,lis2dh12-accel
> +          - st,lis331dl-accel
> +          - st,lis331dlh-accel
> +          - st,lis3de
> +          - st,lis3dh-accel
> +          - st,lis3dhh
> +          - st,lis3l02dq
> +          - st,lis3lv02dl-accel
> +          - st,lng2dm-accel
> +          - st,lsm303agr-accel
> +          - st,lsm303dl-accel
> +          - st,lsm303dlh-accel
> +          - st,lsm303dlhc-accel
> +          - st,lsm303dlm-accel
> +          - st,lsm330-accel
> +          - st,lsm330d-accel
> +          - st,lsm330dl-accel
> +          - st,lsm330dlc-accel
> +      - description: STMicroelectronics Gyroscopes
> +        enum:
> +          - st,l3g4200d-gyro
> +          - st,l3g4is-gyro
> +          - st,l3gd20-gyro
> +          - st,l3gd20h-gyro
> +          - st,lsm330-gyro
> +          - st,lsm330d-gyro
> +          - st,lsm330dl-gyro
> +          - st,lsm330dlc-gyro
> +          - st,lsm9ds0-gyro
> +      - description: STMicroelectronics Magnetometers
> +        enum:
> +          - st,lis2mdl
> +          - st,lis3mdl-magn
> +          - st,lsm303agr-magn
> +          - st,lsm303dlh-magn
> +          - st,lsm303dlhc-magn
> +          - st,lsm303dlm-magn
> +          - st,lsm9ds1-magn
> +      - description: STMicroelectronics Pressure Sensors
> +        enum:
> +          - st,lps001wp-press
> +          - st,lps22hb-press
> +          - st,lps22hh
> +          - st,lps25h-press
> +          - st,lps331ap-press
> +          - st,lps33hw
> +          - st,lps35hw
> +      - description: Deprecated bindings
> +        enum:
> +          - st,lis302dl-spi
> +          - st,lis3lv02d
> +        deprecated: true
>  
>    reg:
>      maxItems: 1
>  
>    interrupts:
> +    description: interrupt line(s) connected to the DRDY line(s) and/or the
> +      Intertial interrupt lines INT1 and INT2 if these exist. This means up to
> +      three interrupts, and the DRDY must be the first one if it exists on
> +      the package. The trigger edge of the interrupts is sometimes software
> +      configurable in the hardware so the operating system should parse this
> +      flag and set up the trigger edge as indicated in the device tree.
>      minItems: 1
> +    maxItems: 2
>  
>    vdd-supply: true
>    vddio-supply: true
>  
>    st,drdy-int-pin:
>      $ref: /schemas/types.yaml#/definitions/uint32
> -    description:
> -      Some sensors have multiple possible pins via which they can provide
> -      a data ready interrupt.  This selects which one.
> -    enum:
> -      - 1
> -      - 2
> +    maxItems: 1
> +    description: the pin on the package that will be used to signal
> +      "data ready" (valid values 1 or 2). This property is not configurable
> +      on all sensors.
> +    items:
> +      minimum: 1
> +      maximum: 2

Why not use the simpler enum approach, or even the [1, 2] form of that for
more compactness?

>  
>    drive-open-drain:
> -    $ref: /schemas/types.yaml#/definitions/flag
> -    description: |
> -      The interrupt/data ready line will be configured as open drain, which
> -      is useful if several sensors share the same interrupt line.
> +    type: boolean
> +    description: the interrupt/data ready line will be configured
> +      as open drain, which is useful if several sensors share the same
> +      interrupt line. (This binding is taken from pinctrl.)
> +
> +  mount-matrix:
> +    description: an optional 3x3 mounting rotation matrix.
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            # These have no interrupts
> +            - st,lps001wp
> +    then:
> +      properties:
> +        interrupts: false
> +        st,drdy-int-pin: false
> +        drive-open-drain: false
> +
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            # These have only DRDY
> +            - st,lis2mdl
> +            - st,lis3l02dq
> +            - st,lis3lv02dl-accel
> +            - st,lps22hb-press
> +            - st,lps22hh
> +            - st,lps25h-press
> +            - st,lps33hw
> +            - st,lps35hw
> +            - st,lsm303agr-magn
> +            - st,lsm303dlh-magn
> +            - st,lsm303dlhc-magn
> +            - st,lsm303dlm-magn
> +    then:
> +      properties:
> +        interrupts:
> +          maxItems: 1
> +        st,drdy-int-pin: false
> +
> +  - if:
> +      properties:
> +        compatible:
> +          enum:
> +            # Two intertial interrupts i.e. accelerometer/gyro interrupts
> +            - st,h3lis331dl-accel
> +            - st,l3g4200d-gyro
> +            - st,l3g4is-gyro
> +            - st,l3gd20-gyro
> +            - st,l3gd20h-gyro
> +            - st,lis2de12
> +            - st,lis2dw12
> +            - st,lis2hh12
> +            - st,lis2dh12-accel
> +            - st,lis331dl-accel
> +            - st,lis331dlh-accel
> +            - st,lis3de
> +            - st,lis3dh-accel
> +            - st,lis3dhh
> +            - st,lis3mdl-magn
> +            - st,lng2dm-accel
> +            - st,lps331ap-press
> +            - st,lsm303agr-accel
> +            - st,lsm303dlh-accel
> +            - st,lsm303dlhc-accel
> +            - st,lsm303dlm-accel
> +            - st,lsm330-accel
> +            - st,lsm330-gyro
> +            - st,lsm330d-accel
> +            - st,lsm330d-gyro
> +            - st,lsm330dl-accel
> +            - st,lsm330dl-gyro
> +            - st,lsm330dlc-accel
> +            - st,lsm330dlc-gyro
> +            - st,lsm9ds0-gyro
> +            - st,lsm9ds1-magn
> +    then:
> +      properties:
> +        interrupts:
> +          maxItems: 2
>  
>  required:
>    - compatible
> @@ -108,16 +202,18 @@ additionalProperties: false
>  examples:
>    - |
>      #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/gpio/gpio.h>

why gpio.h?

>      i2c {
> -        #address-cells = <1>;
> -        #size-cells = <0>;
> -        accelerometer@1d {
> -            compatible = "st,lis3lv02dl-accel";
> -            reg = <0x1d>;
> -            interrupt-parent = <&gpio2>;
> -            interrupts = <18 IRQ_TYPE_EDGE_RISING>;
> -            pinctrl-0 = <&lis3lv02dl_nhk_mode>;
> -            pinctrl-names = "default";
> -        };
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      accelerometer@1c {
> +        compatible = "st,lis331dl-accel";
> +        reg = <0x1c>;

Whilst one example that covers i2c and spi would be good, its
a bit of a stretch to have a chipselect of 1c.

Perhaps we should just add a second example for spi?

> +        st,drdy-int-pin = <1>;
> +        vdd-supply = <&ldo1>;
> +        vddio-supply = <&ldo2>;
> +        interrupt-parent = <&gpio>;
> +        interrupts = <18 IRQ_TYPE_EDGE_RISING>, <19 IRQ_TYPE_EDGE_RISING>;
> +      };
>      };
> -...