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SubjectRe: [PATCH v2 1/2] cpufreq: Add sunxi nvmem based CPU scaling driver
On 09-04-19, 13:25, Yangtao Li wrote:
> +static const struct sunxi_cpufreq_soc_data sun50i_h6_data = {
> + .efuse_xlate = sun50i_efuse_xlate,
> + .nvmem_mask = 0x7,
> + .nvmem_shift = 5,
> +};
> +
> +static const struct of_device_id sunxi_cpufreq_match_list[] = {
> + { .compatible = "allwinner,sun50i-h6", .data = &sun50i_h6_data },
> + {}
> +};
> +
> +static const struct of_device_id *sunxi_cpufreq_match_node(void)
> +{
> + struct device_node *np;
> + const struct of_device_id *match;
> +
> + np = of_find_node_by_path("/");
> + match = of_match_node(sunxi_cpufreq_match_list, np);
> + of_node_put(np);
> +
> + return match;
> +}
> +

Above code can be placed just above sunxi_cpufreq_init(), if you ...

> +static int sunxi_cpufreq_nvmem_probe(struct platform_device *pdev)
> +{
> + const struct sunxi_cpufreq_soc_data *soc_data;
> + struct opp_table **opp_tables;
> + const struct of_device_id *match;
> + char name[MAX_NAME_LEN];
> + unsigned int cpu;
> + u32 speed = 0;
> + int ret;
> +
> + opp_tables = kcalloc(num_possible_cpus(), sizeof(*opp_tables),
> + GFP_KERNEL);
> + if (!opp_tables)
> + return -ENOMEM;
> +
> + match = sunxi_cpufreq_match_node();

... avoid this and ...

> + soc_data = match->data;
> + if (!soc_data)
> + return -EINVAL;
> +
> + ret = sunxi_cpufreq_get_efuse(soc_data, &speed);
> + if (ret)
> + return ret;
> +
> + snprintf(name, MAX_NAME_LEN, "speed%d", speed);
> +
> + for_each_possible_cpu(cpu) {
> + struct device *cpu_dev = get_cpu_device(cpu);
> +
> + if (NULL == cpu_dev) {
> + ret = -ENODEV;
> + goto free_opp;
> + }
> +
> + opp_tables[cpu] = dev_pm_opp_set_prop_name(cpu_dev, name);
> + if (IS_ERR(opp_tables[cpu])) {
> + ret = PTR_ERR(opp_tables[cpu]);
> + pr_err("Failed to set prop name\n");
> + goto free_opp;
> + }
> + }
> +
> + cpufreq_dt_pdev = platform_device_register_simple("cpufreq-dt", -1,
> + NULL, 0);
> + if (!IS_ERR(cpufreq_dt_pdev)) {
> + platform_set_drvdata(pdev, opp_tables);
> + return 0;
> + }
> +
> + ret = PTR_ERR(cpufreq_dt_pdev);
> + pr_err("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_prop_name(opp_tables[cpu]);
> + }
> + kfree(opp_tables);
> +
> + return ret;
> +}
> +
> +static int sunxi_cpufreq_nvmem_remove(struct platform_device *pdev)
> +{
> + struct opp_table **opp_tables = platform_get_drvdata(pdev);
> + unsigned int cpu;
> +
> + platform_device_unregister(cpufreq_dt_pdev);
> +
> + for_each_possible_cpu(cpu)
> + dev_pm_opp_put_prop_name(opp_tables[cpu]);
> +
> + kfree(opp_tables);
> +
> + return 0;
> +}
> +
> +static struct platform_driver sunxi_cpufreq_driver = {
> + .probe = sunxi_cpufreq_nvmem_probe,
> + .remove = sunxi_cpufreq_nvmem_remove,
> + .driver = {
> + .name = "sunxi-cpufreq-nvmem",
> + },
> +};
> +
> +/*
> + * Since the driver depends on nvmem drivers, which may return EPROBE_DEFER,
> + * all the real activity is done in the probe, which may be defered as well.
> + * The init here is only registering the driver and the platform device.
> + */
> +static int __init sunxi_cpufreq_init(void)
> +{
> + const struct of_device_id *match;
> + int ret;
> +
> + match = sunxi_cpufreq_match_node();
> + if (!match)
> + return -ENODEV;
> +
> + ret = platform_driver_register(&sunxi_cpufreq_driver);
> + if (unlikely(ret < 0))
> + return ret;
> +
> + sunxi_cpufreq_pdev = platform_device_register_simple(
> + "sunxi-cpufreq-nvmem", -1, NULL, 0);

... pass match->data as platform device's data here..

> + ret = PTR_ERR_OR_ZERO(sunxi_cpufreq_pdev);
> + if (0 == ret)
> + return 0;
> +
> + platform_driver_unregister(&sunxi_cpufreq_driver);
> + return ret;
> +}
> +module_init(sunxi_cpufreq_init);
> +
> +static void __exit sunxi_cpufreq_exit(void)
> +{
> + platform_device_unregister(sunxi_cpufreq_pdev);
> + platform_driver_unregister(&sunxi_cpufreq_driver);
> +}
> +module_exit(sunxi_cpufreq_exit);
> +
> +MODULE_DESCRIPTION("Sunxi cpufreq driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.17.0

--
viresh

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