linux-kernel - Re: [PATCH v2 4/9] mfd: cs5535-mfd: Register clients using their own dedicated MFD cell entries

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Message-ID: <20191021132108.GK4365@dell>
Date:   Mon, 21 Oct 2019 14:21:08 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     arnd@...db.de, broonie@...nel.org, linus.walleij@...aro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        baohua@...nel.org, stephan@...hold.net
Subject: Re: [PATCH v2 4/9] mfd: cs5535-mfd: Register clients using their own
 dedicated MFD cell entries

On Mon, 21 Oct 2019, Daniel Thompson wrote:

> On Mon, Oct 21, 2019 at 11:58:17AM +0100, Lee Jones wrote:
> > CS5535 is the only user of mfd_clone_cell().  It makes more sense to
> > register child devices in the traditional way and remove the quite
> > bespoke mfd_clone_cell() call from the MFD API.
> > 
> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > ---
> >  drivers/mfd/cs5535-mfd.c | 24 ++++++++++++++++++------
> >  1 file changed, 18 insertions(+), 6 deletions(-)
> > 
> > diff --git a/drivers/mfd/cs5535-mfd.c b/drivers/mfd/cs5535-mfd.c
> > index 053e33447808..96a99ac13384 100644
> > --- a/drivers/mfd/cs5535-mfd.c
> > +++ b/drivers/mfd/cs5535-mfd.c
> > @@ -57,9 +57,17 @@ static struct mfd_cell cs5535_mfd_cells[] = {
> >  	},
> >  };
> >  
> > -static const char *olpc_acpi_clones[] = {
> > -	"olpc-xo1-pm-acpi",
> > -	"olpc-xo1-sci-acpi"
> > +static struct mfd_cell cs5535_olpc_mfd_cells[] = {
> > +	{
> > +		.name = "olpc-xo1-pm-acpi",
> > +		.num_resources = 1,
> > +		.resources = &cs5535_mfd_resources[ACPI_BAR],
> > +	},
> > +	{
> > +		.name = "olpc-xo1-sci-acpi",
> > +		.num_resources = 1,
> > +		.resources = &cs5535_mfd_resources[ACPI_BAR],
> > +	},
> 
> Is the cs5535-acpi cell actually used by anything? I think it was only
> ever used as a template and can be removed; I didn't spot any driver that
> uses it.

I did think about this, but I assumed removing it at this stage would
make the resource matching below more convoluted.

I'll take another look at see what I can do.

> PS If the cell were removed then my review comment on the previous patch
>    becomes moot ;-)
> 
> 
> >  };
> >  
> >  static int cs5535_mfd_probe(struct pci_dev *pdev,
> > @@ -105,10 +113,14 @@ static int cs5535_mfd_probe(struct pci_dev *pdev,
> >  			goto err_remove_devices;
> >  		}
> >  
> > -		err = mfd_clone_cell("cs5535-acpi", olpc_acpi_clones,
> > -				     ARRAY_SIZE(olpc_acpi_clones));
> > +		err = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
> > +				      cs5535_olpc_mfd_cells,
> > +				      ARRAY_SIZE(cs5535_olpc_mfd_cells),
> > +				      NULL, 0, NULL);
> >  		if (err) {
> > -			dev_err(&pdev->dev, "Failed to clone MFD cell\n");
> > +			dev_err(&pdev->dev,
> > +				"Failed to add CS5532 OLPC sub-devices: %d\n",
> > +				err);
> >  			goto err_release_acpi;
> >  		}
> >  	}

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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