linux-kernel - Re: [PATCH 1/4] mfd: Add Ricoh RN5T618 PMIC core driver

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Message-ID: <20140827075614.GZ26707@lee--X1>
Date:	Wed, 27 Aug 2014 08:56:14 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Beniamino Galvani <b.galvani@...il.com>
Cc:	linux-kernel@...r.kernel.org, Samuel Ortiz <sameo@...ux.intel.com>,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Wim Van Sebroeck <wim@...ana.be>,
	linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
	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>,
	Grant Likely <grant.likely@...aro.org>,
	Carlo Caione <carlo@...one.org>
Subject: Re: [PATCH 1/4] mfd: Add Ricoh RN5T618 PMIC core driver

On Wed, 27 Aug 2014, Beniamino Galvani wrote:
> Ricoh RN5T618 is a power management IC which integrates 3 step-down
> DCDC converters, 7 low-dropout regulators, a Li-ion battery charger,
> fuel gauge, ADC, GPIOs and a watchdog timer.
> 
> This commit adds a MFD core driver to support the I2C communication
> with the device.
> 
> Signed-off-by: Beniamino Galvani <b.galvani@...il.com>
> ---
>  drivers/mfd/Kconfig         |   11 +++
>  drivers/mfd/Makefile        |    1 +
>  drivers/mfd/rn5t618.c       |  129 ++++++++++++++++++++++++++
>  include/linux/mfd/rn5t618.h |  210 +++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 351 insertions(+)
>  create mode 100644 drivers/mfd/rn5t618.c
>  create mode 100644 include/linux/mfd/rn5t618.h

Really nicely done.  We don't normally get many first submissions at
this quality level.

One question and a _really_ small nit though.

> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 8d5fad2..fae8c5b 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -582,6 +582,17 @@ config MFD_RC5T583
>  	  Additional drivers must be enabled in order to use the
>  	  different functionality of the device.
>  
> +config MFD_RN5T618
> +	bool "Ricoh RN5T5618 PMIC"

Shouldn't this be tristate?

> +	depends on I2C=y

If so, this should be:

  depends on I2C

> +	select MFD_CORE
> +	select REGMAP_I2C
> +	help
> +	  Say yes here to add support for the Ricoh RN5T618 PMIC. This
> +	  driver provides common support for accessing the device,
> +	  additional drivers must be enabled in order to use the
> +	  functionality of the device.

[...]

> +++ b/drivers/mfd/rn5t618.c
> @@ -0,0 +1,129 @@

[...]

> +static int rn5t618_i2c_probe(struct i2c_client *i2c,
> +			     const struct i2c_device_id *id)
> +{

[...]

> +	dev_info(&i2c->dev, "RN5T618 MFD driver loaded");

Can you remove this line?  We normally only print things when
information is gathered from a chip i.e. version information and the
like.

> +	return 0;
> +}

[...]

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