linux-kernel - Re: [PATCH v2 2/3] mfd: lp873x: Add lp873x PMIC support

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Message-ID: <20160517080130.GG17238@dell>
Date:	Tue, 17 May 2016 09:01:30 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Keerthy <a0393675@...com>
Cc:	Keerthy <j-keerthy@...com>, broonie@...nel.org,
	lgirdwood@...il.com, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
	robh+dt@...nel.org, mark.rutland@....com
Subject: Re: [PATCH v2 2/3] mfd: lp873x: Add lp873x PMIC support

On Fri, 13 May 2016, Keerthy wrote:
> On Thursday 12 May 2016 06:48 PM, Lee Jones wrote:
> >On Tue, 10 May 2016, Keerthy wrote:
> >
> >>The LP873X chip is a power management IC for Portable Navigation Systems
> >>     and Tablet Computing devices. It contains the following components:
> >>
> >>      - Regulators.
> >>      - Configurable General Purpose Output Signals(GPO).
> >>
> >>PMIC interacts with the main processor through i2c. PMIC has
> >>couple of LDOs(Linear Regulators), couple of BUCKs (Step-Down DC-DC
> >>Converter Cores) and GPOs(General Purpose Output Signals). At this
> >>time only the regulator functionality is made available.
> >>
> >>Signed-off-by: Keerthy <j-keerthy@...com>
> >>---
> >>
> >>Changes in v2:
> >>
> >>   * Used mfd_add_devices instead of of_pltaform_populate.
> >
> >Didn't see this conversation, but of_platform_populate () is usually
> >okay?
> 
> https://lkml.org/lkml/2016/5/6/244.

Did Mark tell you why you shouldn't be using it?

> >>  drivers/mfd/Kconfig        |  15 +++
> >>  drivers/mfd/Makefile       |   2 +
> >>  drivers/mfd/lp873x.c       |  98 +++++++++++++++++
> >>  include/linux/mfd/lp873x.h | 265 +++++++++++++++++++++++++++++++++++++++++++++
> >>  4 files changed, 380 insertions(+)
> >>  create mode 100644 drivers/mfd/lp873x.c
> >>  create mode 100644 include/linux/mfd/lp873x.h

[...]

> >>+/**
> >>+ * struct lp873x - state holder for the lp873x driver
> >>+ * Device data may be used to access the LP873X chip
> >>+ */
> >>+struct lp873x {
> >>+	struct device *dev;
> >>+	unsigned long id;
> >>+	u8 rev;
> >>+	struct mutex lp873_lock;	/* lock guarding the data structure */
> >>+	struct regmap *regmap;
> >
> >Are all of these used in >1 driver?
> 
> Apart from id and rev all are used.

Then why are id and rev in there?

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