linux-kernel - Re: [PATCH v2 3/4] mfd: add support for Allwinner SoCs ADC

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Message-ID: <20160721200802.GL5993@lukather>
Date:	Thu, 21 Jul 2016 22:08:02 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Jonathan Cameron <jic23@...nel.org>,
	Quentin Schulz <quentin.schulz@...e-electrons.com>,
	jdelvare@...e.com, linux@...ck-us.net, knaack.h@....de,
	lars@...afoo.de, pmeerw@...erw.net, wens@...e.org,
	linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
	linux-iio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	thomas.petazzoni@...e-electrons.com,
	antoine.tenart@...e-electrons.com
Subject: Re: [PATCH v2 3/4] mfd: add support for Allwinner SoCs ADC

1;4205;0c
On Thu, Jul 21, 2016 at 01:12:53PM +0100, Lee Jones wrote:
> On Wed, 20 Jul 2016, Jonathan Cameron wrote:
> 
> > On 19/07/16 08:31, Lee Jones wrote:
> > > On Mon, 18 Jul 2016, Jonathan Cameron wrote:
> > > 
> > >> On 15/07/16 10:59, Quentin Schulz wrote:
> > >>> The Allwinner SoCs all have an ADC that can also act as a touchscreen
> > >>> controller and a thermal sensor. For now, only the ADC and the thermal
> > >>> sensor drivers are probed by the MFD, the touchscreen controller support
> > >>> will be added later.
> > >>>
> > >>> Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
> > >> Hmm. Previous patch includes the header this one creates.  Ordering issue?
> > >> The depends kind of prevents build failures by ensuring that can't be built
> > >> until this one is in place, but it is certainly an ugly way to do it.
> > >>
> > >> Few little bits innline.
> > >>> ---
> > >>>
> > >>> v2:
> > >>>  - add license headers,
> > >>>  - reorder alphabetically includes,
> > >>>  - add SUNXI_GPADC_ prefixes for defines,
> > >>>
> > >>>  drivers/mfd/Kconfig                 |  14 +++
> > >>>  drivers/mfd/Makefile                |   2 +
> > >>>  drivers/mfd/sunxi-gpadc-mfd.c       | 197 ++++++++++++++++++++++++++++++++++++
> > >>>  include/linux/mfd/sunxi-gpadc-mfd.h |  23 +++++
> > >>>  4 files changed, 236 insertions(+)
> > >>>  create mode 100644 drivers/mfd/sunxi-gpadc-mfd.c
> > >>>  create mode 100644 include/linux/mfd/sunxi-gpadc-mfd.h
> > > 
> > > [...]
> > > 
> > >>> +static struct mfd_cell sun6i_gpadc_mfd_cells[] = {
> > >>> +	{
> > >>> +		.name	= "sun6i-a31-gpadc-iio",
> > >>> +		.resources = adc_resources,
> > >>> +		.num_resources = ARRAY_SIZE(adc_resources),
> > >>> +	}, {
> > >>> +		.name = "iio_hwmon",
> > >> I still really dislike using this to force the probe of that driver but
> > >> kind of up to the hwmon / mfd guys on this.
> > > 
> > > Can you at least say *why* you don't like it?
> > It just feels odd to have an mfd child that isn't really dependent
> > on the mfd hardware itself.
> > 
> > Still if you are happy, mfd is your domain and my objections were
> > as you probably noticed not that strong - or well described!)
> > 
> > So I'm fine with this.
> 
> I see.  So it's not actually part of the same IP/chip?

The chip has a temperature sensor, and we want to expose that
temperature through IIO.

But we don't really have the choice on how we probe iio-hwmon
here. The binding was already there, and we have to keep it.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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