linux-kernel - Re: [PATCH v2 2/2] mtd: rawnand: Add NAND controller support on Intel LGM SoC

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Message-ID: <20200420111754.5863324b@collabora.com>
Date:   Mon, 20 Apr 2020 11:17:54 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     "Ramuthevar,Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        devicetree@...r.kernel.org, miquel.raynal@...tlin.com,
        richard@....at, vigneshr@...com, arnd@...db.de,
        brendanhiggins@...gle.com, tglx@...utronix.de,
        anders.roxell@...aro.org, masonccyang@...c.com.tw,
        piotrs@...ence.com, robh+dt@...nel.org, linux-mips@...r.kernel.org,
        hauke.mehrtens@...el.com, qi-ming.wu@...el.com,
        cheol.yong.kim@...el.com
Subject: Re: [PATCH v2 2/2] mtd: rawnand: Add NAND controller support on
 Intel LGM SoC

On Mon, 20 Apr 2020 01:20:40 +0300
Andy Shevchenko <andriy.shevchenko@...el.com> wrote:

> On Sat, Apr 18, 2020 at 10:55:33AM +0200, Boris Brezillon wrote:
> > On Fri, 17 Apr 2020 16:21:47 +0800
> > "Ramuthevar,Vadivel MuruganX"
> > <vadivel.muruganx.ramuthevar@...ux.intel.com> wrote:
> >   
> > > From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>  
> 
> > > +static const struct of_device_id lgm_nand_match[] = {
> > > +	{ .compatible = "intel,lgm-nand", },
> > > +	{}
> > > +};
> > > +MODULE_DEVICE_TABLE(of, lgm_nand_match);  
> > 
> > You probably have a missing "depends on OF" in your Kconfig.  
> 
> Since it's using device property API, dependency is not needed.
> 

There's no compile-time dependency, but this driver will be pretty
useless if all its users have the NAND controller node defined in their
DT and CONFIG_OF is not enabled. I guess the OF option is selected by
arches, so explicitly depending on OF is only relevant if you change
the dependency rules as suggested in my other reply.