linux-kernel - Re: [PATCH v2 2/4] mfd/axp2xx: extend axp20x to support axp288 pmic

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Date:	Wed, 10 Sep 2014 10:13:54 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:	IIO <linux-iio@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	DEVICE TREE <devicetree@...r.kernel.org>,
	Carlo Caione <carlo@...one.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Aaron Lu <aaron.lu@...el.com>, Alan Cox <alan@...ux.intel.com>,
	Jean Delvare <khali@...ux-fr.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh+dt@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Hartmut Knaack <knaack.h@....de>,
	Fugang Duan <B38611@...escale.com>,
	Arnd Bergmann <arnd@...db.de>,
	Zubair Lutfullah <zubair.lutfullah@...il.com>,
	Sebastian Reichel <sre@...ian.org>,
	Johannes Thumshirn <johannes.thumshirn@....de>,
	Philippe Reynes <tremyfr@...oo.fr>,
	Angelo Compagnucci <angelo.compagnucci@...il.com>,
	Doug Anderson <dianders@...omium.org>,
	Ramakrishna Pallala <ramakrishna.pallala@...el.com>
Subject: Re: [PATCH v2 2/4] mfd/axp2xx: extend axp20x to support axp288 pmic

On Tue, 09 Sep 2014, Jacob Pan wrote:

> XPower AXP288 is a customized PMIC for Intel Baytrail-CR platforms. Similar
> to AXP202/209, AXP288 comes with USB charger, more LDO and BUCK channels, and
> AD converter. It also provides extended status and interrupt reporting
> capabilities than the devices supported in axp20x.c.
> 
> In addition to feature extension, this patch also adds ACPI binding for
> enumeration and hooks for ACPI custom operational region handlers.
> 
> Files and common data structures have been renamed from axp20x to axp2xx
> in order to suit the extended scope of devices.
> 
> This consolidated driver should support more Xpower PMICs in both device
> tree and ACPI based platforms.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>  drivers/mfd/axp2xx.c       | 426 +++++++++++++++++++++++++++++++++++----------
>  include/linux/mfd/axp2xx.h |  57 +++++-
>  2 files changed, 388 insertions(+), 95 deletions(-)
> 
> diff --git a/drivers/mfd/axp2xx.c b/drivers/mfd/axp2xx.c
> index c534443..4830bbe 100644
> --- a/drivers/mfd/axp2xx.c
> +++ b/drivers/mfd/axp2xx.c
> @@ -1,9 +1,9 @@
>  /*
> - * axp20x.c - MFD core driver for the X-Powers AXP202 and AXP209
> + * axp2xx.c - MFD core driver for the X-Powers AXP202, AXP209, and AXP288

Any renaming should be part of the renaming patch.

Please remove the supported devices from the description.

> - * AXP20x comprises an adaptive USB-Compatible PWM charger, 2 BUCK DC-DC
> - * converters, 5 LDOs, multiple 12-bit ADCs of voltage, current and temperature
> - * as well as 4 configurable GPIOs.
> + * AXP2xx typically comprises an adaptive USB-Compatible PWM charger, BUCK DC-DC
> + * converters, LDOs, multiple 12-bit ADCs of voltage, current and temperature
> + * as well as configurable GPIOs.
>   *
>   * Author: Carlo Caione <carlo@...one.org>
>   *
> @@ -25,9 +25,14 @@
>  #include <linux/mfd/core.h>
>  #include <linux/of_device.h>
>  #include <linux/of_irq.h>
> +#include <linux/acpi.h>
>  
>  #define AXP20X_OFF	0x80
>  
> +static struct mfd_cell *axp2xx_cells;
> +static int axp2xx_nr_cells;
> +static struct regmap_config *regmap_cfg;

Only use globals if you 'really' have to.

[...]

> +static int axp2xx_match_device(struct axp2xx_dev *axp2xx, struct device *dev)
>  {
> -	struct axp20x_dev *axp20x;
> +	const struct acpi_device_id *acpi_id;
>  	const struct of_device_id *of_id;
> -	int ret;
>  
> -	axp20x = devm_kzalloc(&i2c->dev, sizeof(*axp20x), GFP_KERNEL);
> -	if (!axp20x)
> -		return -ENOMEM;
> +	of_id = of_match_device(axp2xx_of_match, dev);
> +	if (of_id) {
> +		axp2xx->variant = (long) of_id->data;
> +		goto found_match;

Place the ACPI stuff in an else instead of using goto.

> +	}
>  
> -	of_id = of_match_device(axp20x_of_match, &i2c->dev);
> -	if (!of_id) {
> -		dev_err(&i2c->dev, "Unable to setup AXP20X data\n");
> +	acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
> +	if (!acpi_id || !acpi_id->driver_data) {
> +		dev_err(dev, "Unable to setup AXP2XX ACPI data\n");
> +		return -ENODEV;
> +	}
> +	axp2xx->variant = (long) acpi_id->driver_data;

I think adding ACPI support should be in its own patch.

[...]

> +static int axp2xx_i2c_probe(struct i2c_client *i2c,
> +			const struct i2c_device_id *id)
> +{
> +	struct axp2xx_dev *axp2xx;
> +	int ret;
> +
> +	axp2xx = devm_kzalloc(&i2c->dev, sizeof(*axp2xx), GFP_KERNEL);
> +	if (!axp2xx)
> +		return -ENOMEM;
> +
> +	ret = axp2xx_match_device(axp2xx, &i2c->dev);
> +	if (ret)
> +		return ret;

'\n'.

> +	axp2xx->i2c_client = i2c;
> +	axp2xx->dev = &i2c->dev;
> +	dev_set_drvdata(axp2xx->dev, axp2xx);

I'll do a more thorough review once all of the patches are split up
and grouped nicely.

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