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From: "Vaittinen, Matti" <Matti.Vaittinen@fi.rohmeurope.com>
To: "bgolaszewski@baylibre.com" <bgolaszewski@baylibre.com>
Cc: "dmurphy@ti.com" <dmurphy@ti.com>,
	"linux-leds@vger.kernel.org" <linux-leds@vger.kernel.org>,
	"linux-rtc@vger.kernel.org" <linux-rtc@vger.kernel.org>,
	"linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"alexandre.belloni@bootlin.com" <alexandre.belloni@bootlin.com>,
	"mazziesaccount@gmail.com" <mazziesaccount@gmail.com>,
	"mturquette@baylibre.com" <mturquette@baylibre.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"jacek.anaszewski@gmail.com" <jacek.anaszewski@gmail.com>,
	"linus.walleij@linaro.org" <linus.walleij@linaro.org>,
	"a.zummo@towertech.it" <a.zummo@towertech.it>,
	"lgirdwood@gmail.com" <lgirdwood@gmail.com>,
	"mark.rutland@arm.com" <mark.rutland@arm.com>,
	"robh+dt@kernel.org" <robh+dt@kernel.org>,
	"linux-clk@vger.kernel.org" <linux-clk@vger.kernel.org>,
	"pavel@ucw.cz" <pavel@ucw.cz>,
	"sboyd@kernel.org" <sboyd@kernel.org>,
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	"lee.jones@linaro.org" <lee.jones@linaro.org>
Subject: Re: [RFC PATCH 10/13] gpio: bd71828: Initial support for ROHM BD71828 PMIC GPIOs
Date: Tue, 22 Oct 2019 13:19:37 +0000
Message-ID: <5611c687e6fc86fefb750faf2f726472e22a7d57.camel@fi.rohmeurope.com> (raw)
In-Reply-To: <CAMpxmJVABg-UAzZtaQKu5ADBhi1P7CNArmstxHi5ZfdPiSKyYw@mail.gmail.com>

Hello Bartosz,

Just a short note at this point.

On Mon, 2019-10-21 at 16:36 +0200, Bartosz Golaszewski wrote:
> pon., 21 paź 2019 o 09:00 Vaittinen, Matti
> <Matti.Vaittinen@fi.rohmeurope.com> napisał(a):
> > On Thu, 2019-10-17 at 14:45 +0200, Bartosz Golaszewski wrote:
> > > czw., 17 paź 2019 o 11:53 Matti Vaittinen
> > > 
> > > > +static struct platform_driver bd71828_gpio = {
> > > > +       .driver = {
> > > > +               .name = "bd71828-gpio"
> > > > +       },
> > > > +       .probe = bd71828_probe,
> > > > +};
> > > > +
> > > > +module_platform_driver(bd71828_gpio);
> > > > +
> > > > +MODULE_AUTHOR("Matti Vaittinen <
> > > > matti.vaittinen@fi.rohmeurope.com>
> > > > ");
> > > > +MODULE_DESCRIPTION("BD71828 voltage regulator driver");
> > > > +MODULE_LICENSE("GPL");
> > > 
> > > Don't you need a MODULE_ALIAS() here since this is an MFD sub-
> > > module?
> > 
> > I must admit I don't know the details of how module loading is
> > done. I
> > used system where modules are load by scripts. (I guess the module
> > alias could be used to allow automatic module loading [by udev?])
> > 
> > Can you please educate me - If I add module aliases matching the
> > sub-
> > device name given in in MFD cell - should the sub module loading be
> > automatic when MFD driver gets probed? For some reason I didn't get
> > that working on my test bed. Or maybe I misunderstood something.
> > 
> 
> If the gpio module is a sub-node on the device tree than you may need
> to use a sub-compatible to get the module loaded by udev.
> 
> Bart
> 
> > Eg, this should be enough for GPIO sub-module to be also load:
> > 
> > MFD:
> > static struct mfd_cell bd71828_mfd_cells[] = {
> >         { .name = "bd71828-pmic", },
> >         { .name = "bd71828-gpio", },
> > ...
> > ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
> >                            bd71828_mfd_cells,
> >                            ARRAY_SIZE(bd71828_mfd_cells), NULL, 0,
> >                            regmap_irq_get_domain(irq_data));
> > 
> > GPIO driver:
> > MODULE_ALIAS("platform:bd71828-gpio");
> > 
> > I had the sub-devices probed even without the MODULE_ALIAS - but
> > manual
> > loading is required. I will gladly add the alias if it should
> > enable
> > the automatic module loading.

I had some problems with my test setup. After I fixed those I was able
to test the automatic module loading. The sub-devices do not need own
compatible to be load - they only need the correct module_alias:
"platform:sub-device-name-used-in-mfd-cell". If this is added, the
module for sub-device is load when MFD cell with name matching the
alias is instantiated.

So to your original question - yes, MODULE_ALIAS() is needed for
automated loading. No compatible is required then :)

Thanks for pointing me to correct direction here! It's always nice to
learn something new!

Br,
	Matti Vaittinen

  parent reply index

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-17  9:40 [RFC PATCH 00/13] Support ROHM BD71828 PMIC Matti Vaittinen
2019-10-17  9:41 ` [RFC PATCH 01/13] mfd: bd71828: Support ROHM BD71828 PMIC - core Matti Vaittinen
2019-10-17  9:42 ` [RFC PATCH 02/13] mfd: input: bd71828: Add power-key support Matti Vaittinen
2019-10-17  9:43 ` [RFC PATCH 03/13] clk: bd718x7: Support ROHM BD71828 clk block Matti Vaittinen
2019-10-17  9:44 ` [RFC PATCH 04/13] regulator: bd718x7: Split driver to common and bd718x7 specific parts Matti Vaittinen
2019-10-17  9:44 ` [RFC PATCH 05/13] regulator: bd71828: Basic support for ROHM bd71828 PMIC regulators Matti Vaittinen
2019-10-17  9:48 ` [RFC PATCH 06/13] regulator: bd71828: Add GPIO based run-level control for regulators Matti Vaittinen
2019-10-17  9:50 ` [RFC PATCH 07/13] regulator: bd71828: enhanced run-level support Matti Vaittinen
2019-10-17  9:51 ` [RFC PATCH 08/13] regulator: bd71828: Support in-kernel APIs to change run-level Matti Vaittinen
2019-10-17  9:52 ` [RFC PATCH 09/13] mfd: rtc: support RTC on ROHM BD71828 with BD70528 driver Matti Vaittinen
2019-10-17 10:12   ` Alexandre Belloni
2019-10-17 10:36     ` Vaittinen, Matti
2019-10-17 10:48       ` Alexandre Belloni
2019-10-21  5:29         ` Vaittinen, Matti
2019-10-23 10:27         ` Vaittinen, Matti
2019-10-29 13:50           ` Alexandre Belloni
2019-10-29 14:08             ` Vaittinen, Matti
2019-10-17  9:53 ` [RFC PATCH 10/13] gpio: bd71828: Initial support for ROHM BD71828 PMIC GPIOs Matti Vaittinen
2019-10-17 12:45   ` Bartosz Golaszewski
2019-10-21  7:00     ` Vaittinen, Matti
2019-10-21 14:36       ` Bartosz Golaszewski
2019-10-21 14:56         ` Vaittinen, Matti
2019-10-22 13:19         ` Vaittinen, Matti [this message]
2019-10-17  9:53 ` [RFC PATCH 11/13] led: bd71828: Support LED outputs on ROHM BD71828 PMIC Matti Vaittinen
2019-10-17 14:04   ` Dan Murphy
2019-10-17 14:28     ` Alexandre Belloni
2019-10-21  8:00     ` Vaittinen, Matti
2019-10-21 19:09       ` Jacek Anaszewski
2019-10-22 12:40         ` Vaittinen, Matti
2019-10-22 17:40           ` Jacek Anaszewski
2019-10-23  8:37             ` Vaittinen, Matti
2019-10-23 21:59               ` Jacek Anaszewski
2019-10-24  8:15                 ` Vaittinen, Matti
2019-10-24 22:04                   ` Jacek Anaszewski
2019-10-25  7:07                     ` Vaittinen, Matti
2019-10-25 13:24                       ` Rob Herring
2019-10-25 14:37                         ` Vaittinen, Matti
2019-10-25 15:47                           ` Rob Herring
2019-10-29 13:29                             ` Vaittinen, Matti
2019-10-17  9:55 ` [RFC PATCH 12/13] dt-bindings: mfd: Document ROHM BD71282 bindings Matti Vaittinen
2019-10-17 14:18   ` Dan Murphy
2019-10-21  8:03     ` Vaittinen, Matti
2019-10-17  9:57 ` [RFC PATCH 13/13] dt-bindings: regulator: Document ROHM BD71282 regulator bindings Matti Vaittinen

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