linux-kernel - Re: [PATCH v3 04/18] iio: adc: add support for X-Powers AXP20X and AXP22X PMICs ADCs

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Date:   Tue, 21 Feb 2017 19:03:22 +0100
From:   Quentin Schulz <quentin.schulz@...e-electrons.com>
To:     Jonathan Cameron <jic23@...nel.org>, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, robh+dt@...nel.org,
        mark.rutland@....com, wens@...e.org, sre@...nel.org,
        linux@...linux.org.uk, maxime.ripard@...e-electrons.com,
        lee.jones@...aro.org
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        thomas.petazzoni@...e-electrons.com, icenowy@...c.xyz,
        bonbons@...ux-vserver.org
Subject: Re: [PATCH v3 04/18] iio: adc: add support for X-Powers AXP20X and
 AXP22X PMICs ADCs

Hi Jonathan,

On 19/02/2017 13:40, Jonathan Cameron wrote:
> On 14/02/17 09:40, Quentin Schulz wrote:
>> The X-Powers AXP20X and AXP22X PMICs have multiple ADCs. They expose the
>> battery voltage, battery charge and discharge currents, AC-in and VBUS
>> voltages and currents, 2 GPIOs muxable in ADC mode and PMIC temperature.
>>
>> This adds support for most of AXP20X and AXP22X ADCs.
>>
>> Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>
>> Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> Hi Quentin,
> 
> A few bits and bobs inline.  The bigest one is that I don't think
> you need to carry your struct axp_data pointer around in the iio_priv
> structure as it only seems to be used in probe.
> 
> Anyhow, tidy these little bits up (quite a few are optional in the
> sense that they are a matter or personal taste and I don't feel
> strongly about them) and you can add
> 
> Reviewed-by: Jonathan Cameron <jic23@...nel.org>
> 
> A nice driver.
> 
> Jonathan
[...]
>> +static int axp20x_probe(struct platform_device *pdev)
>> +{
>> +	struct axp20x_adc_iio *info;
>> +	struct iio_dev *indio_dev;
>> +	struct axp20x_dev *axp20x_dev;
>> +	int ret;
>> +
>> +	axp20x_dev = dev_get_drvdata(pdev->dev.parent);
>> +
>> +	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
>> +	if (!indio_dev)
>> +		return -ENOMEM;
>> +
>> +	info = iio_priv(indio_dev);
>> +	platform_set_drvdata(pdev, indio_dev);
>> +
>> +	info->regmap = axp20x_dev->regmap;
>> +	indio_dev->dev.parent = &pdev->dev;
>> +	indio_dev->dev.of_node = pdev->dev.of_node;
>> +	indio_dev->modes = INDIO_DIRECT_MODE;
>> +
>> +	info->data = (struct axp_data *)platform_get_device_id(pdev)->driver_data;
> I think this is only actually used in probe, so could be handled more
> neatly with a local variable rather than sticking it in info.
> 
[...]
>> +static int axp20x_remove(struct platform_device *pdev)
>> +{
>> +	struct axp20x_adc_iio *info;
>> +	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
>> +
>> +	info = iio_priv(indio_dev);
> Reorder the two lines above this one and then you could just do this
> inline. (really trivial so feel free to not bother ;)
>> +
>> +	iio_device_unregister(indio_dev);
>> +	iio_map_array_unregister(indio_dev);
>> +
>> +	regmap_write(info->regmap, AXP20X_ADC_EN1, 0);
>> +
>> +	if (info->data->adc_en2)

data is used here to know if I should disable misc ADCs (if supported by
the PMIC). So kinda need it only for that purpose, maybe I can use a
slightly simpler structure to only store regmap and this adc_en2 boolean.

Ack for everything else.

Thanks,
Quentin

-- 
Quentin Schulz, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com