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Subject: Re: [PATCH v7 2/2] dt-bindings: spi: Document Renesas R-Car Gen3
 RPC-IF controller bindings
To:     masonccyang@mxic.com.tw
Cc:     bbrezillon@kernel.org, broonie@kernel.org,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Simon Horman <horms@verge.net.au>, juliensu@mxic.com.tw,
        linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
        linux-spi@vger.kernel.org, marek.vasut@gmail.com,
        zhengxunli@mxic.com.tw
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From:   Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Message-ID: <7cdecc93-fc7a-3602-25c2-23107dca2a5e@cogentembedded.com>
Date:   Thu, 24 Jan 2019 11:16:43 +0300
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On 24.01.2019 4:40, masonccyang@mxic.com.tw wrote:

>  > > @@ -0,0 +1,46 @@
>  > > +Renesas R-Car Gen3 RPC-IF controller Device Tree Bindings
>  > > +--------------------------------------------------------------------
>  > > +
>  > > +Required properties:
>  > > +- compatible: should be an SoC-specific compatible value, followed by
>  > > +      "renesas,rcar-gen3-rpc" as a fallback, i.e.,
>  > > +      "renesas,r8a77995-rpc", "renesas,rcar-gen3-rpc".
>  > > +      "renesas,r8a7795-rpc" (R-Car H3)
>  > > +      "renesas,r8a7796-rpc" (R-Car M3-W)
>  > > +      "renesas,r8a77965-rpc" (R-Car M3-N)
>  > > +      "renesas,r8a77970-rpc" (R-Car V3M)
>  > > +      "renesas,r8a77980-rpc" (R-Car V3H)
>  > > +      "renesas,r8a77990-rpc" (R-Car E3)
>  > > +      "renesas,r8a77995-rpc" (R-Car D3)
>  > > +- reg: should contain three register areas:
>  >
>  >    The driver now handles "dirmap" and "wbuf" resources as optional --
>  > you need to document that.
>  >
> 
> Why ?

    Because the driver treats "dirmap" and "wbuf" as optional resources.

[...]

> best regards,
> Mason

MBR, Sergei