linux-kernel - Re: Applied "spi: Add Renesas R-Car Gen3 RPC-IF SPI controller driver" to the spi tree

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Date:   Wed, 13 Feb 2019 13:37:31 +0100
From:   Marek Vasut <marek.vasut@...il.com>
To:     Mark Brown <broonie@...nel.org>, masonccyang@...c.com.tw
Cc:     bbrezillon@...nel.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,
        Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
        zhengxunli@...c.com.tw
Subject: Re: Applied "spi: Add Renesas R-Car Gen3 RPC-IF SPI controller
 driver" to the spi tree

On 2/13/19 1:16 PM, Mark Brown wrote:
> On Wed, Feb 13, 2019 at 04:25:32PM +0800, masonccyang@...c.com.tw wrote:
> 
>> From current mainline branch, MFD seems support the device which is on 
>> the same hardware bus(i.e, I2C, SPI, MMIO and SPMI)for multi-function 
>> by Read/Write the common same registers.
> 
> That's most MFDs but there are some that do some level of enumeration
> (even if it's just looking at the device ID that got registered) to
> decide what subdevices get registered, that's what people are suggesting
> here I think.

Right. Although I think some of the code could be shared between the SPI
and HF modes.

>> I am checking and not sure if MMIO of MFD could support RPC-IF for 
>> different hardware bus on SPI and CFI.
>> I also doubt if this method is a correct solution for RPC-IF works
>> either in SPI mode or CFI mode.
> 
> For MMIO devices MFD just passes through the parent resources.
> 


-- 
Best regards,
Marek Vasut