linux-kernel - Re: [PATCH 03/22] iio: adc: add support for X-Powers AXP20X and AXP22X PMICs ADCs

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Date:   Thu, 5 Jan 2017 17:51:42 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>
Cc:     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,
        lee.jones@...aro.org, 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 03/22] iio: adc: add support for X-Powers AXP20X and
 AXP22X PMICs ADCs

On Mon, Jan 02, 2017 at 05:37:03PM +0100, Quentin Schulz wrote:
> +	switch (axp20x_id) {
> +	case AXP209_ID:
> +		indio_dev->info = &axp20x_adc_iio_info;
> +		indio_dev->num_channels = ARRAY_SIZE(axp20x_adc_channels);
> +		indio_dev->channels = axp20x_adc_channels;
> +
> +		/* Enable the ADCs on IP */
> +		regmap_write(info->regmap, AXP20X_ADC_EN1, AXP20X_ADC_EN1_MASK);
> +
> +		/* Enable GPIO0/1 and internal temperature ADCs */
> +		regmap_update_bits(info->regmap, AXP20X_ADC_EN2,
> +				   AXP20X_ADC_EN2_MASK, AXP20X_ADC_EN2_MASK);
> +
> +		/* Configure ADCs rate */
> +		regmap_update_bits(info->regmap, AXP20X_ADC_RATE,
> +				   AXP20X_ADC_RATE_MASK, AXP20X_ADC_RATE_50HZ);
> +		break;
> +
> +	case AXP221_ID:
> +		indio_dev->info = &axp22x_adc_iio_info;
> +		indio_dev->num_channels = ARRAY_SIZE(axp22x_adc_channels);
> +		indio_dev->channels = axp22x_adc_channels;
> +
> +		/* Enable the ADCs on IP */
> +		regmap_write(info->regmap, AXP20X_ADC_EN1, AXP22X_ADC_EN1_MASK);
> +
> +		/* Configure ADCs rate */
> +		regmap_update_bits(info->regmap, AXP20X_ADC_RATE,
> +				   AXP20X_ADC_RATE_MASK, AXP22X_ADC_RATE_200HZ);
> +		break;
> +
> +	default:
> +		return -EINVAL;
> +	}

I'm not a big fan of those IDs. It always ends up with a ever
increasing list of cases without any consolidation.

In this case, the only thing you need is a list of pointers and values
that can definitely be stored in a structure.

Maxime

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

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