linux-kernel - Re: [PATCH 5/5] staging: drivers: iio: adc: Adc MAX77541 ADC Support

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Date:   Wed, 7 Dec 2022 13:30:16 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Okan Sahin <okan.sahin@...log.com>
Cc:     outreachy@...ts.linux.dev, Lee Jones <lee@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        ChiYuan Huang <cy_huang@...htek.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Caleb Connolly <caleb.connolly@...aro.org>,
        Anand Ashok Dumbre <anand.ashok.dumbre@...inx.com>,
        Ramona Bolboaca <ramona.bolboaca@...log.com>,
        William Breathitt Gray <william.gray@...aro.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH 5/5] staging: drivers: iio: adc: Adc MAX77541 ADC Support

On Wed, Dec 07, 2022 at 12:08:44PM +0300, Okan Sahin wrote:
> This patch add adc support for MAX77541.
> 
> The MAX77541 has an 8-bit Successive Approximation Register (SAR) ADC
> with four multiplexers for supporting the telemetry feature

Same comment as per patch 2.

...

> +#include <linux/bitfield.h>
> +#include <linux/iio/iio.h>

> +#include <include/linux/mfd/max77541.h>

Hmm...

> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/driver.h>
> +#include <linux/regulator/of_regulator.h>

...

> +enum {
> +	MAX77541_ADC_CH1_I = 0,
> +	MAX77541_ADC_CH2_I,
> +	MAX77541_ADC_CH3_I,
> +	MAX77541_ADC_CH6_I,
> +
> +	MAX77541_ADC_IRQMAX_I,

If it's a terminator, drop the trailing comma.

> +};

...

> +	case MAX77541_ADC_TEMP:
> +		*val = -273;

I believe we have definition for this in units.h. Can you use it?

> +		*val2 = 0;
> +		return IIO_VAL_INT_PLUS_MICRO;


> +	}
> +}

...

> +		*val = 0;
> +
> +		if (reg_val == LOW_RANGE)
> +			*val2 = 6250;
> +		else if (reg_val == MID_RANGE)
> +			*val2 = 12500;
> +		else if (reg_val == HIGH_RANGE)
> +			*val2 = 25000;
> +		else
> +			return -EINVAL;

Can it be provided as a table?

...

> +		*val = 0;
> +
> +		if (reg_val == LOW_RANGE)
> +			*val2 = 6250;
> +		else if (reg_val == MID_RANGE)
> +			*val2 = 12500;
> +		else if (reg_val == HIGH_RANGE)
> +			*val2 = 25000;
> +		else
> +			return -EINVAL;

Ditto.

...

> +

Redundant blank line.

> +module_platform_driver(max77541_adc_driver);

-- 
With Best Regards,
Andy Shevchenko