linux-kernel - RE: [PATCH mfd v1] mfd: Add Renesas Synchronization Management Unit (SMU) support

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Date:   Fri, 21 May 2021 14:36:23 +0000
From:   Min Li <min.li.xe@...esas.com>
To:     Lee Jones <lee.jones@...aro.org>
CC:     "sameo@...ux.intel.com" <sameo@...ux.intel.com>,
        "grant.likely@...aro.org" <grant.likely@...aro.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH mfd v1] mfd: Add Renesas Synchronization Management Unit
 (SMU) support

> >
> > +config MFD_RSMU_I2C
> > +	tristate "Renesas Synchronization Management Unit with I2C"
> > +	depends on I2C && OF
> > +	depends on MFD_RSMU_SPI=n
> 
> Not sure I've seen a relationship like this before.
> 
> Devices capable of SPI and I2C usually have a core driver which selects one
> or the other.  It will also save some code duplication you have here.  Please
> take a look at some other examples in the MFD subsystem.


Hi Lee

Thanks for taking your time to review my code. I will start working on the core driver. But
Kconfig items will stay as MFD_RSMU_I2C and MFD_RSMU_SPI like the existing ones 

MFD_MADERA_SPI
MFD_MADERA_I2C

MFD_DA9052_SPI
MFD_DA9052_I2C

MFD_MC13XXX_SPI
MFD_MC13XXX_I2C

Min