linux-kernel - Re: [PATCH v7 14/15] cpufreq: Add module to register cpufreq on Krait CPUs

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Date:   Mon, 26 Feb 2018 15:34:25 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Sricharan R <sricharan@...eaurora.org>
Cc:     robh+dt@...nel.org, mark.rutland@....com, mturquette@...libre.com,
        sboyd@...eaurora.org, linux@...linux.org.uk, andy.gross@...aro.org,
        david.brown@...aro.org, rjw@...ysocki.net,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-pm@...r.kernel.org, robh@...nel.org
Subject: Re: [PATCH v7 14/15] cpufreq: Add module to register cpufreq on
 Krait CPUs

On 26-02-18, 15:23, Sricharan R wrote:
> From: Stephen Boyd <sboyd@...eaurora.org>

Is this email id still valid ?

> +static int __init qcom_cpufreq_populate_opps(struct nvmem_cell *pvs_nvmem,
> +					     struct opp_table **tbl)
> +{
> +	int speed = 0, pvs = 0, pvs_ver = 0, cpu;
> +	struct device *cpu_dev;
> +	u8 *buf;
> +	size_t len;
> +	char pvs_name[] = "speedXX-pvsXX-vXX";
> +
> +	buf = nvmem_cell_read(pvs_nvmem, &len);
> +	if (len == 4)
> +		get_krait_bin_format_a(&speed, &pvs, &pvs_ver, pvs_nvmem, buf);
> +	else if (len == 8)
> +		get_krait_bin_format_b(&speed, &pvs, &pvs_ver, pvs_nvmem, buf);
> +	else
> +		pr_warn("Unable to read nvmem data. Defaulting to 0!\n");
> +
> +	snprintf(pvs_name, sizeof(pvs_name), "speed%d-pvs%d-v%d",
> +		 speed, pvs, pvs_ver);
> +
> +	for (cpu = 0; cpu < num_possible_cpus(); cpu++) {
> +		cpu_dev = get_cpu_device(cpu);
> +		if (!cpu_dev)
> +			return -ENODEV;
> +
> +		tbl[cpu] = dev_pm_opp_set_prop_name(cpu_dev, pvs_name);
> +
> +		if (IS_ERR(tbl[cpu])) {
> +			tbl[cpu] = 0;
> +			pr_warn("failed to add OPP name %s\n", pvs_name);
> +			return PTR_ERR(tbl[cpu]);

You just set tbl[cpu] to 0 :)

> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int __init qcom_cpufreq_driver_init(void)
> +{
> +	struct platform_device *pdev;
> +	struct device *cpu_dev;
> +	struct device_node *np;
> +	struct nvmem_cell *pvs_nvmem;
> +	struct opp_table *tbl[NR_CPUS] = { NULL };
> +	int ret, cpu = 0;
> +
> +	cpu_dev = get_cpu_device(0);
> +	if (!cpu_dev)
> +		return -ENODEV;
> +
> +	np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
> +	if (!np)
> +		return -ENOENT;
> +
> +	if (!of_device_is_compatible(np, "operating-points-v2-krait-cpu")) {
> +		ret = -ENOENT;
> +		goto free_np;
> +	}
> +
> +	pvs_nvmem = of_nvmem_cell_get(np, NULL);
> +	if (IS_ERR(pvs_nvmem)) {
> +		dev_err(cpu_dev, "Could not get nvmem cell\n");
> +		ret = PTR_ERR(pvs_nvmem);
> +		goto free_np;
> +	}
> +
> +	ret = qcom_cpufreq_populate_opps(pvs_nvmem, tbl);
> +	if (ret)
> +		goto free_opp_name;
> +
> +	pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
> +	if (IS_ERR(pdev)) {
> +		ret = PTR_ERR(pdev);
> +		goto free_opp_name;
> +	}
> +
> +	of_node_put(np);
> +
> +	return 0;
> +
> +free_opp_name:
> +	while (tbl[cpu]) {
> +		dev_pm_opp_put_prop_name(tbl[cpu]);
> +		cpu++;
> +	}
> +
> +free_np:
> +	of_node_put(np);
> +
> +	return ret;
> +}
> +late_initcall(qcom_cpufreq_driver_init);
> +
> +MODULE_DESCRIPTION("Qualcomm CPUfreq driver");
> +MODULE_AUTHOR("Stephen Boyd <sboyd@...eaurora.org>");
> +MODULE_LICENSE("GPL v2");

Everything else is fine. Fix above issue and you can add

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh