linux-kernel - Re: [PATCH v10 1/2] cpufreq: Add Kryo CPU scaling driver

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Message-ID: <3f1ca60e-7aa8-fccc-ab1c-4b7c37731cce@arm.com>
Date:   Wed, 23 May 2018 11:39:37 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Ilia Lin <ilialin@...eaurora.org>, vireshk@...nel.org, nm@...com,
        sboyd@...nel.org, robh@...nel.org, mark.rutland@....com,
        rjw@...ysocki.net, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v10 1/2] cpufreq: Add Kryo CPU scaling driver



On 23/05/18 10:40, Ilia Lin wrote:
> In Certain QCOM SoCs like apq8096 and msm8996 that have KRYO processors,
> the CPU frequency subset and voltage value of each OPP varies
> based on the silicon variant in use. Qualcomm Process Voltage Scaling Tables
> defines the voltage and frequency value based on the msm-id in SMEM
> and speedbin blown in the efuse combination.
> The qcom-cpufreq-kryo driver reads the msm-id and efuse value from the SoC
> to provide the OPP framework with required information.
> This is used to determine the voltage and frequency value for each OPP of
> operating-points-v2 table when it is parsed by the OPP framework.
> 
> Signed-off-by: Ilia Lin <ilialin@...eaurora.org>

[...]

> +	pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
> +	if (!IS_ERR(pdev))
> +		return 0;
> +
> +	ret = PTR_ERR(pdev);
> +	dev_err(cpu_dev, "Failed to register platform device\n");
> +
> +free_opp:
> +	for_each_possible_cpu(cpu) {
> +		if (IS_ERR_OR_NULL(opp_tables[cpu]))
> +			break;
> +		dev_pm_opp_put_supported_hw(opp_tables[cpu]);
> +	}
> +free_np:
> +	of_node_put(np);
> +
> +	return ret;
> +}
> +late_initcall(qcom_cpufreq_kryo_driver_init);

Any particular reason why this *has* to be late initcall ?
Please change it to module_initcall otherwise.
Also address the of_node comments from Viresh.

Otherwise, it looks good.
-- 
Regards,
Sudeep