[PATCH 1/3] dt-bindings: misc: lwn,bk4-spi: Add binding

[Lukasz Majewski]

Hi Fabio,

> From: Fabio Estevam <festevam at denx.de>
> 
> Add a lwn,bk4-spi.yaml binding for Liebherr's BK4 external SPI
> controller.
> 
> Currently, the compatible string used for this device is "lwn,bk4",
> which is the same as the board compatible string documented at
> fsl.yaml.
> 
> This causes several dt-schema warnings:
> 
> make dtbs_check DT_SCHEMA_FILES=fsl.yaml
> ...
> 
> ['lwn,bk4'] is too short
> 'lwn,bk4' is not one of ['tq,imx8dxp-tqma8xdp-mba8xx']
> 'lwn,bk4' is not one of ['tq,imx8qxp-tqma8xqp-mba8xx']
> 'lwn,bk4' is not one of ['armadeus,imx1-apf9328', 'fsl,imx1ads']
> ...
> 
> Use a more specific "lwn,bk4-spi" compatible string for this
> device.
> 

Thanks for updating this.

BK4 is another example of to be long-time supported device... :-)

> Signed-off-by: Fabio Estevam <festevam at denx.de>
> ---
>  .../devicetree/bindings/misc/lwn,bk4-spi.yaml | 54
> +++++++++++++++++++ .../devicetree/bindings/misc/lwn-bk4.txt      |
> 26 --------- 2 files changed, 54 insertions(+), 26 deletions(-)
>  create mode 100644
> Documentation/devicetree/bindings/misc/lwn,bk4-spi.yaml delete mode
> 100644 Documentation/devicetree/bindings/misc/lwn-bk4.txt
> 
> diff --git a/Documentation/devicetree/bindings/misc/lwn,bk4-spi.yaml
> b/Documentation/devicetree/bindings/misc/lwn,bk4-spi.yaml new file
> mode 100644 index 000000000000..7fb86e6abade
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/lwn,bk4-spi.yaml
> @@ -0,0 +1,54 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/misc/lwn,bk4-spi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Liebherr's BK4 external SPI controller
> +
> +maintainers:
> +  - Lukasz Majewski <lukma at denx.de>
> +
> +description: |
> +  Liebherr's BK4 external SPI controller is a device which handles
> data
> +  acquisition from compatible industrial peripherals.
> +  The SPI is used for data and management purposes in both master and
> +  slave modes.
> +
> +allOf:
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml#
> +
> +properties:
> +  compatible:
> +    const: lwn,bk4-spi
> +
> +  reg:
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 30000000
> +
> +  fsl,spi-cs-sck-delay: true
> +
> +  fsl,spi-sck-cs-delay: true
> +
> +required:
> +  - compatible
> +  - spi-max-frequency
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        spidev at 0 {
> +            compatible = "lwn,bk4-spi";
> +            reg = <0>;
> +            spi-max-frequency = <30000000>;
> +            fsl,spi-cs-sck-delay = <200>;
> +            fsl,spi-sck-cs-delay = <400>;
> +        };
> +    };
> diff --git a/Documentation/devicetree/bindings/misc/lwn-bk4.txt
> b/Documentation/devicetree/bindings/misc/lwn-bk4.txt deleted file
> mode 100644 index d6a8c188c087..000000000000
> --- a/Documentation/devicetree/bindings/misc/lwn-bk4.txt
> +++ /dev/null
> @@ -1,26 +0,0 @@
> -* Liebherr's BK4 controller external SPI
> -
> -A device which handles data acquisition from compatible industrial
> -peripherals.
> -The SPI is used for data and management purposes in both master and
> -slave modes.
> -
> -Required properties:
> -
> -- compatible : Should be "lwn,bk4"
> -
> -Required SPI properties:
> -
> -- reg : Should be address of the device chip select within
> -  the controller.
> -
> -- spi-max-frequency : Maximum SPI clocking speed of device in Hz,
> should be
> -  30MHz at most for the Liebherr's BK4 external bus.
> -
> -Example:
> -
> -spidev0: spi at 0 {
> -	compatible = "lwn,bk4";
> -	spi-max-frequency = <30000000>;
> -	reg = <0>;
> -};




Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma at denx.de
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