linux-kernel - Re: [PATCH 2/2] iio: adc: imx93: Make calibration parameters configurable

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Message-ID: <aG-GZqhABwErcEyM@smile.fi.intel.com>
Date: Thu, 10 Jul 2025 12:22:46 +0300
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Primoz Fiser <primoz.fiser@...ik.com>
Cc: Haibo Chen <haibo.chen@....com>, Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>, Nuno Sa <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, linux-iio@...r.kernel.org,
	imx@...ts.linux.dev, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	upstream@...ts.phytec.de, andrej.picej@...ik.com
Subject: Re: [PATCH 2/2] iio: adc: imx93: Make calibration parameters
 configurable

On Thu, Jul 10, 2025 at 09:39:04AM +0200, Primoz Fiser wrote:
> 
> Make i.MX93 ADC calibration parameters:
>  - AVGEN: Enable calibration averaging function,
>  - NRSMPL: Select number of calibration samples,
>  - TSAMP: Select sample time of calibration conversions,
> 
> in the MCR register configurable with the corresponding device-tree
> properties:
>  - nxp,calib-avg-en,
>  - nxp,calib-nr-samples and
>  - nxp,calib-t-sample.

...

>  #include <linux/platform_device.h>
>  #include <linux/pm_runtime.h>
>  #include <linux/regulator/consumer.h>
> +#include <linux/property.h>

Keep it in order.

...

> +	ret = device_property_read_u32(adc->dev, "nxp,calib-avg-en", &val);
> +	if (!ret) {
> +		if (val != 0 && val != 1) {
> +			dev_err(adc->dev, "invalid nxp,calib-avg-en: %d\n", val);
> +			return -EINVAL;
> +		}
> +		reg = val;
> +		mcr &= ~IMX93_ADC_MCR_AVGEN_MASK;
> +		mcr |= FIELD_PREP(IMX93_ADC_MCR_AVGEN_MASK, reg);
> +	}

Please, since it's optional, do other way around.

	val = $DEFAUTL;
	device_property_read_u32(adc->dev, "nxp,calib-avg-en", &val);
	FIELD_MODIFY(...)

Similar approach may be used for the other properties.

...

> +	/* write calibration settings to MCR */
> +	writel(mcr, adc->regs + IMX93_ADC_MCR);

Please, factor out this to the function, so we won't see the direct IO in the
->probe().

-- 
With Best Regards,
Andy Shevchenko