linux-kernel - Re: [PATCH v12 3/3] dt-bindings: mfd: Document Renesas R-Car Gen3 RPC-IF MFD bindings

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Date:   Wed, 8 May 2019 05:52:16 +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,
        Rob Herring <robh@...nel.org>,
        sergei.shtylyov@...entembedded.com, zhengxunli@...c.com.tw
Subject: Re: [PATCH v12 3/3] dt-bindings: mfd: Document Renesas R-Car Gen3
 RPC-IF MFD bindings

On 5/8/19 4:48 AM, masonccyang@...c.com.tw wrote:
> Hi Jones,
> 
>> "Lee Jones" <lee.jones@...aro.org>
>> 2019/05/07 下午 08:58
>>
>> To
>>
>> "Marek Vasut" <marek.vasut@...il.com>,
>>
>> cc
>>
>> "Rob Herring" <robh@...nel.org>, "Mason Yang"
>> <masonccyang@...c.com.tw>, broonie@...nel.org, linux-
>> kernel@...r.kernel.org, linux-spi@...r.kernel.org,
>> bbrezillon@...nel.org, linux-renesas-soc@...r.kernel.org, "Geert
>> Uytterhoeven" <geert+renesas@...der.be>,
>> sergei.shtylyov@...entembedded.com, mark.rutland@....com,
>> devicetree@...r.kernel.org, juliensu@...c.com.tw, "Simon Horman"
>> <horms@...ge.net.au>, zhengxunli@...c.com.tw
>>
>> Subject
>>
>> Re: [PATCH v12 3/3] dt-bindings: mfd: Document Renesas R-Car Gen3
>> RPC-IF MFD bindings
>>
>> On Wed, 24 Apr 2019, Marek Vasut wrote:
>>
>> > On 4/24/19 11:23 PM, Rob Herring wrote:
>> > > On Wed, Apr 24, 2019 at 03:55:36PM +0800, Mason Yang wrote:
>> > >> Document the bindings used by the Renesas R-Car Gen3 RPC-IF MFD.
>> > >>
>> > >> Signed-off-by: Mason Yang <masonccyang@...c.com.tw>
>> > >> ---
>> > >>  .../devicetree/bindings/mfd/mfd-renesas-rpc.txt    | 40 ++++++
>> ++++++++++++++++
>> > >>  1 file changed, 40 insertions(+)
>> > >>  create mode 100644 Documentation/devicetree/bindings/mfd/mfd-
>> renesas-rpc.txt
>> > >>
>> > >> diff --git a/Documentation/devicetree/bindings/mfd/mfd-renesas-
>> rpc.txt b/Documentation/devicetree/bindings/mfd/mfd-renesas-rpc.txt
>> > >> new file mode 100644
>> > >> index 0000000..668b822
>> > >> --- /dev/null
>> > >> +++ b/Documentation/devicetree/bindings/mfd/mfd-renesas-rpc.txt
>> > >> @@ -0,0 +1,40 @@
>> > >> +Renesas R-Car Gen3 RPC-IF MFD Device Tree Bindings
>> > >> +--------------------------------------------------
>> > >
>> > > Looks like a SPI flash controller from the example. What makes it an
>> > > MFD?
>> >
>> > It supports both SPI NOR and HyperFlash (CFI-compliant flash with
>> > different bus interface).
>>
>> Looks like you're registering one OR the other.
>>
>> Why don't you just do this from DT?
>>
>> No reason for this to be an MFD IMHO.
> 
> 
> okay, I will patch it back to SPI mode only.

I don't think that's what Lee meant . The controller supports _both_
modes , hence it would have the same compatible string. You just need to
extract the mode of operation from the DT.

-- 
Best regards,
Marek Vasut