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 17:24:27 +0300
From:   Ivan Bornyakov <i.bornyakov@...rotek.ru>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     mdf@...nel.org, hao.wu@...el.com, yilun.xu@...el.com,
        trix@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, 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 Mon, Jul 18, 2022 at 03:58:22PM +0200, Krzysztof Kozlowski wrote:
> 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).
> 

I really don't know what to say aside from "thing that capable to
program FPGA". Is there a good exmple of proper wording in
Documentation/devicetree/bindings/fpga/?
Otherwise I would ask FPGA Manager framework maintainers assistance on
how to describe a FPGA Manager driver.

> > +
> > +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