linux-kernel - Re: [PATCH v3 2/2] dt-bindings: fpga: add binding doc for ecp5-spi fpga mgr

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Date:   Mon, 18 Jul 2022 15:58:22 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Ivan Bornyakov <i.bornyakov@...rotek.ru>, mdf@...nel.org,
        hao.wu@...el.com, yilun.xu@...el.com, trix@...hat.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org
Cc:     linux-fpga@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, system@...rotek.ru
Subject: Re: [PATCH v3 2/2] dt-bindings: fpga: add binding doc for ecp5-spi
 fpga mgr

On 18/07/2022 13:49, Ivan Bornyakov wrote:
> Add Device Tree Binding doc for Lattice ECP5 FPGA manager using slave
> SPI to load .bit formatted uncompressed bitstream image.
> 
> Signed-off-by: Ivan Bornyakov <i.bornyakov@...rotek.ru>
> ---
>  .../bindings/fpga/lattice,ecp5-fpga-mgr.yaml  | 73 +++++++++++++++++++
>  1 file changed, 73 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/fpga/lattice,ecp5-fpga-mgr.yaml
> 
> diff --git a/Documentation/devicetree/bindings/fpga/lattice,ecp5-fpga-mgr.yaml b/Documentation/devicetree/bindings/fpga/lattice,ecp5-fpga-mgr.yaml
> new file mode 100644
> index 000000000000..bb10fd316f94
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/fpga/lattice,ecp5-fpga-mgr.yaml
> @@ -0,0 +1,73 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/fpga/lattice,ecp5-fpga-mgr.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Lattice ECP5 Slave SPI FPGA manager.
> +
> +maintainers:
> +  - Ivan Bornyakov <i.bornyakov@...rotek.ru>
> +
> +description:
> +  FPGA Manager capable to program Lattice ECP5 with uncompressed bitstream
> +  image in .bit format over SPI.

The same question as before - you need to explain what is the hardware
(not Linux API or Linux subsystem).

> +
> +allOf:
> +  - $ref: /schemas/spi/spi-peripheral-props.yaml
> +
> +properties:
> +  reg:
> +    maxItems: 1
> +
> +  spi-max-frequency:
> +    maximum: 60000000
> +
> +  compatible:
> +    enum:
> +      - lattice,ecp5-fpga-mgr

Compatible goes first in the list of properties. Change here was not
requested, so I am surprised to see different coding style.

> +
> +  program-gpios:
> +    description:
> +      A GPIO line connected to PROGRAMN (active low) pin of the device.
> +      Initiates configuration sequence.
> +    maxItems: 1
> +
> +  init-gpios:
> +    description:
> +      A GPIO line connected to INITN (active low) pin of the device.
> +      Indicates that the FPGA is ready to be configured.
> +    maxItems: 1
> +
> +  done-gpios:
> +    description:
> +      A GPIO line connected to DONE (active high) pin of the device.
> +      Indicates that the configuration sequence is complete.
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - program-gpios
> +  - init-gpios
> +  - done-gpios
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    spi {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        fpga-mgr@0 {
> +            compatible = "lattice,ecp5-fpga-mgr";
> +            spi-max-frequency = <20000000>;
> +            reg = <0>;

compatible then reg, then rest of properties.



Best regards,
Krzysztof