linux-kernel - Re: [PATCH v13 3/3] dt-bindings: mfd: Document Renesas R-Car Gen3 RPC-IF controller bindings

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Message-ID: <2671d488-82a1-8720-d9a1-03554d955a38@gmail.com>
Date:   Tue, 18 Jun 2019 14:01:40 +0200
From:   Marek Vasut <marek.vasut@...il.com>
To:     masonccyang@...c.com.tw, Lee Jones <lee.jones@...aro.org>
Cc:     bbrezillon@...nel.org, broonie@...nel.org,
        devicetree@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Simon Horman <horms@...ge.net.au>, juliensu@...c.com.tw,
        linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-spi@...r.kernel.org, mark.rutland@....com,
        miquel.raynal@...tlin.com, robh+dt@...nel.org,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [PATCH v13 3/3] dt-bindings: mfd: Document Renesas R-Car Gen3
 RPC-IF controller bindings

On 6/6/19 9:40 AM, masonccyang@...c.com.tw wrote:
[...]

> RPC-IF works either in SPI or HyperFlash is decided by external hardware 
> pins 
> configuration and it can NOT switch it's operation mode in the run time. 
> This is not like my understanding of MFD.

Which external hardware pins decide the RPC configuration ?

It seems to me like PHYCNT register, PHYMEM bitfield, selects what
device is connected, and then a couple of other bits control the
communication, but I see nothing which would be tied to any external
configuration pins.

[...]

-- 
Best regards,
Marek Vasut