linux-kernel - Re: [PATCH v14 3/3] iio: adc: ad7173: add AD7173 driver

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Date: Thu, 22 Feb 2024 16:02:10 +0200
From: Andy Shevchenko <andy@...nel.org>
To: Dumitru Ceclan <mitrutzceclan@...il.com>
Cc: linus.walleij@...aro.org, brgl@...ev.pl, linux-gpio@...r.kernel.org,
	Lars-Peter Clausen <lars@...afoo.de>,
	Jonathan Cameron <jic23@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Michael Walle <michael@...le.cc>, Arnd Bergmann <arnd@...db.de>,
	ChiaEn Wu <chiaen_wu@...htek.com>,
	Niklas Schnelle <schnelle@...ux.ibm.com>,
	Leonard Göhrs <l.goehrs@...gutronix.de>,
	Mike Looijmans <mike.looijmans@...ic.nl>,
	Haibo Chen <haibo.chen@....com>,
	Hugo Villeneuve <hvilleneuve@...onoff.com>,
	David Lechner <dlechner@...libre.com>,
	Ceclan Dumitru <dumitru.ceclan@...log.com>,
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, Nuno Sa <nuno.sa@...log.com>
Subject: Re: [PATCH v14 3/3] iio: adc: ad7173: add AD7173 driver

On Thu, Feb 22, 2024 at 01:07:43PM +0200, Dumitru Ceclan wrote:
> The AD7173 family offer a complete integrated Sigma-Delta ADC solution
> which can be used in high precision, low noise single channel
> applications or higher speed multiplexed applications. The Sigma-Delta
> ADC is intended primarily for measurement of signals close to DC but also
> delivers outstanding performance with input bandwidths out to ~10kHz.

A couple more comments which Jonathan might address when applying,
up to him.

..

With

	struct device *dev = &st->sd.spi->dev;

the below will be neater.


> +	struct ad7173_state *st = iio_priv(indio_dev);
> +	u8 buf[AD7173_RESET_LENGTH];
> +	unsigned int id;
> +	int ret;

..

> +	if (id != st->info->id)
> +		dev_warn(&st->sd.spi->dev,
> +			 "Unexpected device id: 0x%04X, expected: 0x%04X\n",
> +			 id, st->info->id);

(like here)

..

> +	st->config_usage_counter = 0;
> +	st->config_cnts = devm_kcalloc(&st->sd.spi->dev, st->info->num_configs,
> +				       sizeof(u64), GFP_KERNEL);

sizeof(*st->config_cnts) ?

(or here)

> +	if (!st->config_cnts)
> +		return -ENOMEM;

..

> +	ret = fwnode_property_match_property_string(dev_fwnode(dev),


device_property_match_property_string()

> +						    "clock-names",
> +						    ad7173_clk_sel,
> +						    ARRAY_SIZE(ad7173_clk_sel));

..

> +	if (num_channels == 0)
> +		return dev_err_probe(dev, -EINVAL, "No channels specified\n");

-ENODATA?

-- 
With Best Regards,
Andy Shevchenko