From: Lee Jones <lee.jones@linaro.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Serge Semin <fancer.lancer@gmail.com>,
linux-gpio@vger.kernel.org,
Linus Walleij <linus.walleij@linaro.org>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>,
linux-kernel@vger.kernel.org,
Heikki Krogerus <heikki.krogerus@linux.intel.com>
Subject: Re: [PATCH v1 3/6] mfd: core: Propagate software node group to the sub devices
Date: Wed, 17 Jun 2020 13:51:28 +0100 [thread overview]
Message-ID: <20200617125128.GW2608702@dell> (raw)
In-Reply-To: <20200609124000.GO2428291@smile.fi.intel.com>
On Tue, 09 Jun 2020, Andy Shevchenko wrote:
> On Mon, Jun 08, 2020 at 08:25:24PM +0100, Lee Jones wrote:
> > On Mon, 08 Jun 2020, Andy Shevchenko wrote:
> >
> > > From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> > >
> > > When ever device properties are supplied for a sub device, a software node
> > > (fwnode) is actually created and then associated with that device. By allowing
> > > the drivers to supply the complete software node group instead of just the
> > > properties in it, the drivers can take advantage of the other features the
> > > software nodes have on top of supplying the device properties.
> > >
> > > Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > > ---
> > > drivers/mfd/mfd-core.c | 31 +++++++++++++++++++++++++++----
> > > include/linux/mfd/core.h | 3 +++
> > > 2 files changed, 30 insertions(+), 4 deletions(-)
> >
> > I'm not sure a change to the API is justified presently (same does go
> > for 'properties' really, but as it was only a couple of lines, it
> > didn't seem too intrusive).
>
> This is better and comprehensive API, but I heard you.
>
> > My recommendation is to handle this in-house (i.e. locally in-driver)
> > for now.
>
> I think you understand that this is not gonna work (we need to attach fwnode
> to the child device before it's registration.
>
> > When (if) more users adopt the practice, then we should
> > consider to draw down on line numbers and repetition and make it part
> > of the API.
>
> I briefly looked at the current state of affairs and found that properties are
> used only for MFD LPSS driver. Would the conversion of that driver to swnodes
> work for you?
>
> Note, the long prospective is to get rid of platform_add_properties() API
> completely.
That's a shame. Do you plan on replacing it with something else?
MFD tends to only interact with the platform_device API, and even
platform_device_add_properties() doesn't get involved in the nitty
gritty of fwnodes. Instead it acts as a pass-through straight to
device_add_properties() which is where the magic happens.
For this to be acceptable you would need to add support into
platform_device i.e. platform_device_add_property_group() or some
such. I really do not want the MFD API to have knowledge about
regarding the particulars i.e. software node registration, secondary
fwnodes and the like.
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog
next prev parent reply other threads:[~2020-06-17 12:51 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-08 13:42 [PATCH v1 0/6] mfd: Make use of software nodes Andy Shevchenko
2020-06-08 13:42 ` [PATCH v1 1/6] gpio: dwapb: Replace irq_shared flag with fwnode type check Andy Shevchenko
2020-06-08 13:42 ` [PATCH v1 2/6] gpio: dwapb: Read GPIO base from snps,gpio-base property Andy Shevchenko
2020-06-10 11:26 ` Linus Walleij
2020-06-10 13:41 ` Andy Shevchenko
2020-06-08 13:42 ` [PATCH v1 3/6] mfd: core: Propagate software node group to the sub devices Andy Shevchenko
2020-06-08 19:25 ` Lee Jones
2020-06-09 12:40 ` Andy Shevchenko
2020-06-17 12:51 ` Lee Jones [this message]
2020-06-08 13:42 ` [PATCH v1 4/6] mfd: intel_quark_i2c_gpio: Convert to use software nodes Andy Shevchenko
2020-06-10 11:38 ` Linus Walleij
2020-06-10 13:43 ` Andy Shevchenko
2020-06-08 13:42 ` [PATCH v1 5/6] gpio: dwapb: Get rid of legacy platform data Andy Shevchenko
2020-06-10 11:39 ` Linus Walleij
2020-06-10 13:47 ` Andy Shevchenko
2020-06-08 13:43 ` [PATCH v1 6/6] gpio: dwapb: Define magic number for IRQ and GPIO lines Andy Shevchenko
2020-06-16 20:02 ` [PATCH v1 0/6] mfd: Make use of software nodes Serge Semin
2020-06-16 21:40 ` Andy Shevchenko
2020-06-16 22:56 ` Serge Semin
2020-06-18 8:56 ` Andy Shevchenko
2020-06-19 22:12 ` Serge Semin
2020-06-20 10:13 ` Andy Shevchenko
2020-06-23 1:49 ` Serge Semin
2020-06-24 12:43 ` Andy Shevchenko
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