linux-kernel - Re: [PATCH 2/4] mfd: tps65086: Add driver for the TPS65086 PMIC

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Message-ID: <20151020100214.GM31804@x1>
Date:	Tue, 20 Oct 2015 11:02:14 +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>,
	Alexandre Courbot <gnurou@...il.com>,
	Grygorii Strashko <grygorii.strashko@...com>,
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] mfd: tps65086: Add driver for the TPS65086 PMIC

On Mon, 19 Oct 2015, Andrew F. Davis wrote:
> On 10/19/2015 04:23 AM, Lee Jones wrote:
> >On Fri, 16 Oct 2015, Andrew F. Davis wrote:
> >
> >>Add support for the TPS65912 device. It provides communication
> >>through I2C and contains the following components:
> >>
> >>  - Regulators
> >>  - Load switches
> >>  - GPO controller
> >
> >What's a GPO controller?
> 
> General Purpose Output, this controller only has output control, it's
> listed in the data-sheet this way, and other drivers have used this term.

Okay.

> >>Signed-off-by: Andrew F. Davis <afd@...com>
> >>---
> >>  drivers/mfd/Kconfig          |  13 ++++
> >>  drivers/mfd/Makefile         |   1 +
> >>  drivers/mfd/tps65086.c       | 145 +++++++++++++++++++++++++++++++++++++++++++
> >>  include/linux/mfd/tps65086.h | 120 +++++++++++++++++++++++++++++++++++
> >>  4 files changed, 279 insertions(+)
> >>  create mode 100644 drivers/mfd/tps65086.c
> >>  create mode 100644 include/linux/mfd/tps65086.h
> >>
> >>diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> >>index 99d6367..ab3b392 100644
> >>--- a/drivers/mfd/Kconfig
> >>+++ b/drivers/mfd/Kconfig
> >>@@ -1093,6 +1093,19 @@ config TPS6507X
> >>  	  This driver can also be built as a module.  If so, the module
> >>  	  will be called tps6507x.
> >>
> >>+config MFD_TPS65086
> >>+	tristate "TI TPS65086x Power Management chips"
> >
> >Use the full name:
> >
> >   "TI TPS65086x Power Management Integrated Chips (PMICs)"
> >
> >>+	select REGMAP
> >>+	select REGMAP_IRQ
> >>+	select REGMAP_I2C
> >>+	depends on I2C
> >
> >REGMAP_I2C already depends on I2C.
> >
> 
> So if I force REGMAP_I2C to =y without depending on I2C then couldn't
> REGMAP_I2C get selected without I2C enabled? Selecting doesn't force
> the selected item's dependencies still right?

Try it out. :)

> >>+	depends on OF || COMPILE_TEST
> >>+	help
> >>+	  If you say yes here you get support for the TPS65086 series of
> >>+	  Power Management chips.
> >
> >I'd remove the line break.
> >
> >>+	  These include voltage regulators, GPO and other features
> >
> >GPIO?
> >
> >>+	  that are often used in portable devices.
> >
> >This is meant to be a 'help', so instead of staying "and some other
> >stuff", please list them.
> >
> 
> This seems to be what other devices do, I'll change it to something
> else then.

If you know what the "other features" are, it's best to name them.

> >>  config TPS65911_COMPARATOR
> >>  	tristate
> >>
> >>diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> >>index a59e3fc..7adb902 100644
> >>--- a/drivers/mfd/Makefile
> >>+++ b/drivers/mfd/Makefile
> >>@@ -66,6 +66,7 @@ obj-$(CONFIG_MFD_WM8994)	+= wm8994-core.o wm8994-irq.o wm8994-regmap.o
> >>  obj-$(CONFIG_TPS6105X)		+= tps6105x.o
> >>  obj-$(CONFIG_TPS65010)		+= tps65010.o
> >>  obj-$(CONFIG_TPS6507X)		+= tps6507x.o
> >>+obj-$(CONFIG_MFD_TPS65086)	+= tps65086.o
> >>  obj-$(CONFIG_MFD_TPS65217)	+= tps65217.o
> >>  obj-$(CONFIG_MFD_TPS65218)	+= tps65218.o
> >>  obj-$(CONFIG_MFD_TPS65910)	+= tps65910.o
> >>diff --git a/drivers/mfd/tps65086.c b/drivers/mfd/tps65086.c
> >>new file mode 100644
> >>index 0000000..be6d678
> >>--- /dev/null
> >>+++ b/drivers/mfd/tps65086.c
> >>@@ -0,0 +1,145 @@
> >>+/*
> >>+ * Driver for TI TPS65086x PMICs
> >
> >I'd suggest removing the driver part.  We know it's a driver.
> 
> Again this is what almost every other driver does,

Almost every other driver.  That's some statement.

I count 42%. ;)

> I'm not sure how
> else to describe this file without using the word driver.

Perhaps I'm getting picky in my old age, but I think I'd prefer to see:

  TI TPS65086x PMIC support

[...]

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