linux-kernel - Re: [PATCH v5 2/2] dt-bindings: fpga: add binding doc for ecp5-spi fpga mgr

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Message-ID: <20220729090123.GA28299@homes.emlix.com>
Date:   Fri, 29 Jul 2022 11:01:24 +0200
From:   Daniel Glöckner <dg@...ix.com>
To:     Ivan Bornyakov <i.bornyakov@...rotek.ru>
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,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v5 2/2] dt-bindings: fpga: add binding doc for ecp5-spi
 fpga mgr

Hi,

On Tue, Jul 19, 2022 at 02:23:35PM +0300, Ivan Bornyakov wrote:
> +properties:
> +  compatible:
> +    enum:
> +      - lattice,ecp5-fpga-mgr

Since this driver uses the same interface as the existing
drivers/fpga/machxo2-spi.c driver, wouldn't it be advisable to use a
similar compatible id, i.e. lattice,ecp5-slave-spi?

> +required:
> +  - compatible
> +  - reg
> +  - program-gpios
> +  - init-gpios
> +  - done-gpios

I think some of the GPIOs can be made optional by reading the status
register or using the refresh command, assuming the slave spi interface
stayed enabled after previous programming and we are not dealing with
several chained FPGAs. But that can of course be left as an exercise for
other developers.

Best regards,

  Daniel