linux-kernel - Re: [PATCH v3 3/5] mfd: tps65912: Add driver for the TPS65912 PMIC

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Date:	Tue, 29 Sep 2015 08:19:33 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	"Andrew F. Davis" <afd@...com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Brown <broonie@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/5] mfd: tps65912: Add driver for the TPS65912 PMIC

On Mon, 28 Sep 2015, Andrew F. Davis wrote:

> On 09/25/2015 04:24 PM, Lee Jones wrote:
> >On Fri, 25 Sep 2015, Andrew F. Davis wrote:
> >
> >>On 09/25/2015 11:50 AM, Lee Jones wrote:
> >>>On Thu, 24 Sep 2015, Andrew F. Davis wrote:
> >>>
> >>>>This patch adds support for TPS65912 mfd device. It provides
> >>>>communication through the I2C and SPI interfaces. It contains
> >>>>the following components:
> >>>>
> >>>>  - Regulators
> >>>>  - GPIO controller
> >>>>
> >>>>Signed-off-by: Andrew F. Davis <afd@...com>
> >>>>---
> >>>>  drivers/mfd/Kconfig          |  24 +++
> >>>>  drivers/mfd/Makefile         |   3 +
> >>>>  drivers/mfd/tps65912-core.c  | 114 +++++++++++++
> >>>>  drivers/mfd/tps65912-i2c.c   |  86 ++++++++++
> >>>>  drivers/mfd/tps65912-spi.c   |  85 ++++++++++
> >>>>  include/linux/mfd/tps65912.h | 393 +++++++++++++++++++++++++++++++++++++++++++
> >>>>  6 files changed, 705 insertions(+)
> >>>>  create mode 100644 drivers/mfd/tps65912-core.c
> >>>>  create mode 100644 drivers/mfd/tps65912-i2c.c
> >>>>  create mode 100644 drivers/mfd/tps65912-spi.c
> >>>>  create mode 100644 include/linux/mfd/tps65912.h
> >>>
> >>>[...]
> >>>
> >>>>+#define TPS65912_IRQ(_name, _reg, _offset)			\
> >>>>+	[TPS65912_IRQ_ ## _name] = {				\
> >>>>+		.mask = TPS65912_ ## _reg ## _ ## _name,	\
> >>>>+		.reg_offset = _offset,				\
> >>>>+	}
> >>>
> >>>I told you about this already.
> >>>
> >>>If you want this set to be merged for v4.3 then you'll need commit
> >>>b4fe8ba ("regmap: Add generic macro to define regmap_irq") from my
> >>>tree.
> >>
> >>You asked me to submit this to Mark Brown, I didn't realize you also
> >>wanted me to use the one in your tree. Using yours will make my lines
> >>over 80 chars and so it kind of defeats the purpose but I'll do it
> >>for v4.
> >
> >I asked two of you to upstream a generic incarnation of your
> >implementation.  The other guy got there first.  Now I want everyone
> >to use it instead of hand-rolling their own.
> >
> 
> Got it.
> 
> >>>[...]
> >>>
> >>>>+static struct i2c_driver tps65912_i2c_driver = {
> >>>>+	.driver		= {
> >>>>+		.name	= "tps65912",
> >>>>+		.of_match_table = tps65912_i2c_of_match_table,
> >>>
> >>>of_match_ptr()
> >>>
> >>
> >>Why? tps65912_i2c_of_match_table is always compiled in.
> >
> >But it needn't be.
> >
> 
> This driver is DT only, would it make more sense to just add a dependency
> on CONFIG_OF in the Kconfig?

Yes, that is the alternitive.

> I don't see many other drivers that are DT
> only doing this, the driver should compile just fine without OF enabled,
> it just wont have DT functionality, so is it really dependent on OF?

Then it should be "depends on OF || COMPILE_TEST"

> The of_match_ptr(x) macro looks to be useful when the x is conditionally
> compiled in, but in my case the x (my of_device_id table) is always compiled.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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