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From: masonccyang@mxic.com.tw
To: "Marek Vasut" <marek.vasut@gmail.com>
Cc: bbrezillon@kernel.org, broonie@kernel.org,
	devicetree@vger.kernel.org,
	"Geert Uytterhoeven" <geert+renesas@glider.be>,
	"Simon Horman" <horms@verge.net.au>,
	juliensu@mxic.com.tw, "Lee Jones" <lee.jones@linaro.org>,
	linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
	linux-spi@vger.kernel.org, mark.rutland@arm.com,
	miquel.raynal@bootlin.com, robh+dt@kernel.org,
	"Sergei Shtylyov" <sergei.shtylyov@cogentembedded.com>
Subject: Re: [PATCH v13 3/3] dt-bindings: mfd: Document Renesas R-Car Gen3 RPC-IF controller bindings
Date: Wed, 19 Jun 2019 15:36:20 +0800	[thread overview]
Message-ID: <OFE8CD77A1.CDBE040B-ON4825841E.00288DA8-4825841E.0029C76F@mxic.com.tw> (raw)
In-Reply-To: <2671d488-82a1-8720-d9a1-03554d955a38@gmail.com>


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@mxic.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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      reply	other threads:[~2019-06-19  7:37 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-21  7:19 [PATCH v13 0/3] mfd: Add Renesas R-Car Gen3 RPC-IF MFD & SPI driver Mason Yang
2019-05-21  7:19 ` [PATCH v13 1/3] mfd: Add Renesas R-Car Gen3 RPC-IF MFD driver Mason Yang
2019-06-03 13:02   ` Lee Jones
2019-06-04  0:52     ` masonccyang
2019-05-21  7:19 ` [PATCH v13 2/3] spi: Add Renesas R-Car Gen3 RPC-IF SPI controller driver Mason Yang
2019-05-21  7:19 ` [PATCH v13 3/3] dt-bindings: mfd: Document Renesas R-Car Gen3 RPC-IF controller bindings Mason Yang
2019-05-22 16:50   ` Sergei Shtylyov
2019-05-23  9:16     ` masonccyang
2019-06-03 13:04     ` Lee Jones
2019-06-03 14:55       ` Sergei Shtylyov
2019-06-06  7:40         ` masonccyang
2019-06-18 12:01           ` Marek Vasut
2019-06-19  7:36             ` masonccyang [this message]

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