linux-kernel - Re: [PATCH v5 4/4] thermal: k3_j72xx_bandgap: Add the bandgap driver support

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Date:   Wed, 13 Apr 2022 12:17:25 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Keerthy <j-keerthy@...com>, robh+dt@...nel.org,
        daniel.lezcano@...aro.org, rui.zhang@...el.com, amitk@...nel.org,
        kristo@...nel.org
Cc:     linux-pm@...r.kernel.org, vigneshr@...com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/4] thermal: k3_j72xx_bandgap: Add the bandgap driver
 support

On 12/04/2022 12:14, Keerthy wrote:
> Add VTM thermal support. In the Voltage Thermal Management
> Module(VTM), K3 J72XX supplies a voltage reference and a temperature
> sensor feature that are gathered in the band gap voltage and
> temperature sensor (VBGAPTS) module. The band gap provides current and
> voltage reference for its internal circuits and other analog IP
> blocks. The analog-to-digital converter (ADC) produces an output value
> that is proportional to the silicon temperature.


(...)

> +
> +static void print_look_up_table(struct device *dev, int *ref_table)

Here and everywhere else in such cases - you do not modify pointed data,
so pointers to const please.

> +{
> +	int i;
> +
> +	dev_dbg(dev, "The contents of derived array\n");
> +	dev_dbg(dev, "Code   Temperaturei\n");
> +	for (i = 0; i <= 1023; i++)
> +		dev_dbg(dev, "%d       %d %d\n", i, derived_table[i], ref_table[i]);
> +}
> +
> +static const struct of_device_id of_k3_j72xx_bandgap_match[];
> +

Why do you need forward declaration?

(....)

> +
> +static const struct of_device_id of_k3_j72xx_bandgap_match[] = {
> +	{
> +		.compatible = "ti,j721e-vtm",
> +		.data = (void *)&k3_j72xx_bandgap_j721e_data,

Why do you need the cast?


Best regards,
Krzysztof