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

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Date:   Wed, 19 Jun 2019 15:36:20 +0800
From:   masonccyang@...c.com.tw
To:     "Marek Vasut" <marek.vasut@...il.com>
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,
        "Lee Jones" <lee.jones@...aro.org>, 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

Hi Marek, 

> 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.
> 

You may refer to R-Car D3 Draak Eva. board hardware manual 
and start-up guide, i.e., 
Table 2.12 Pin Multiplexing of R-Car D3 Mode setting pins and
set by hardware switch 1, 2, 3, 13, 31 and 10 to configure
booting from SPI mode or HyperFlash mode.

thanks & best regards,
Mason

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