linux-kernel - RE: [PATCH V2 2/4] mfd: pv88080: MFD core support

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Date:   Tue, 8 Nov 2016 06:18:28 +0000
From:   Eric Hyeung Dong Jeong <eric.jeong.opensource@...semi.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Eric Hyeung Dong Jeong <eric.jeong.opensource@...semi.com>
CC:     LINUX-KERNEL <linux-kernel@...r.kernel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>,
        DEVICETREE <devicetree@...r.kernel.org>,
        LINUX-GPIO <linux-gpio@...r.kernel.org>,
        "Liam Girdwood" <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Support Opensource <Support.Opensource@...semi.com>
Subject: RE: [PATCH V2 2/4] mfd: pv88080: MFD core support

On Friday, October 28, 2016 9:18 PM, Linus Walleij wrote:

> On Thu, Oct 27, 2016 at 3:03 AM, Eric Jeong
> <eric.jeong.opensource@...semi.com> wrote:
> 
> > +++ b/drivers/mfd/pv88080-i2c.c
> > +
> > +static const struct of_device_id pv88080_of_match_table[] = {
> > +       { .compatible = "pvs,pv88080",    .data = (void *)TYPE_PV88080_AA },
> > +       { .compatible = "pvs,pv88080-aa", .data = (void *)TYPE_PV88080_AA },
> > +       { .compatible = "pvs,pv88080-ba", .data = (void *)TYPE_PV88080_BA },
> > +       { },
> > +};
> > +MODULE_DEVICE_TABLE(of, pv88080_of_match_table);
> 
> Actually you are doing something weird.
> 
> The only thing you put in your device tree is this I guess.
> 
> That means that the GPIO chip does *not* have a device tree entry, so you
> cannot reference the GPIOs there with &phandle notation.
> 
> Please look around a bit to see how other OF-MFDs do it: they register and
> populate by struct mfd_cell using the .of_compatible member so that
> subdevices get their own DT nodes, which is necessary for nodes providing
> resources such as GPIOs, regulators and clocks, lest you cannot reference them
> in your device tree!
> 
> Therefore I think all your subdevices should instantiate from device tree with
> compatible matching as well, not as platform devices.
> 
> > +struct pv88080_pdata {
> > +       int (*init)(struct pv88080 *pv88080);
> > +       int irq_base;
> > +       int gpio_base;
> 
> NAK.
> 
> Get irq from the device tree, assign gpio base dynamically.
> 
> > +       struct regulator_init_data
> > + *regulators[PV88080_MAX_REGULATORS];
> 
> I suspect also this should come from the device tree.
> 
> Yours,
> Linus Walleij

Thank you for the comments.
I will send patch again.

Regards
Eric