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SubjectRe: [PATCH] cpufreq: Add Kryo CPU scaling driver
More comments after Russell's reply.

On 19-05-18, 14:35, Ilia Lin wrote:
> +static int __init qcom_cpufreq_kryo_driver_init(void)
> +{
> + struct device *cpu_dev_silver, *cpu_dev_gold;
> + struct opp_table *opp_silver, *opp_gold;
> + enum _msm8996_version msm8996_version;
> + struct nvmem_cell *speedbin_nvmem;
> + struct platform_device *pdev;
> + struct device_node *np;
> + u8 *speedbin;
> + u32 versions;
> + size_t len;
> + int ret;
> +
> + cpu_dev_silver = get_cpu_device(SILVER_LEAD);
> + if (IS_ERR_OR_NULL(cpu_dev_silver))

get_cpu_device() returns only NULL on error.

> + return PTR_ERR(cpu_dev_silver);
> +
> + cpu_dev_gold = get_cpu_device(SILVER_LEAD);
> + if (IS_ERR_OR_NULL(cpu_dev_gold))
> + return PTR_ERR(cpu_dev_gold);
> +
> + msm8996_version = qcom_cpufreq_kryo_get_msm_id();
> + if (NUM_OF_MSM8996_VERSIONS == msm8996_version) {
> + dev_err(cpu_dev_silver, "Not Snapdragon 820/821!");
> + return -ENODEV;
> + }
> +
> + np = dev_pm_opp_of_get_opp_desc_node(cpu_dev_silver);
> + if (IS_ERR_OR_NULL(np))

same here.

> + return PTR_ERR(np);
> +
> + if (!of_device_is_compatible(np, "operating-points-v2-kryo-cpu")) {
> + ret = -ENOENT;
> + goto free_np;
> + }
> +
> + speedbin_nvmem = of_nvmem_cell_get(np, NULL);
> + if (IS_ERR(speedbin_nvmem)) {
> + ret = PTR_ERR(speedbin_nvmem);
> + dev_err(cpu_dev_silver, "Could not get nvmem cell: %d\n", ret);
> + goto free_np;
> + }
> +
> + speedbin = nvmem_cell_read(speedbin_nvmem, &len);
> + nvmem_cell_put(speedbin_nvmem);
> +
> + switch (msm8996_version) {
> + case MSM8996_V3:
> + versions = 1 << (unsigned int)(*speedbin);
> + break;
> + case MSM8996_SG:
> + versions = 1 << ((unsigned int)(*speedbin) + 4);
> + break;
> + default:
> + BUG();
> + break;
> + }
> +
> + opp_silver = dev_pm_opp_set_supported_hw(cpu_dev_silver,&versions,1);
> + if (IS_ERR(opp_silver)) {
> + dev_err(cpu_dev_silver, "Failed to set supported hardware\n");
> + ret = PTR_ERR(opp_silver);
> + goto free_np;
> + }
> +
> + opp_gold = dev_pm_opp_set_supported_hw(cpu_dev_gold,&versions,1);
> + if (IS_ERR(opp_gold)) {
> + dev_err(cpu_dev_gold, "Failed to set supported hardware\n");
> + ret = PTR_ERR(opp_gold);
> + goto free_opp_silver;
> + }
> +
> + pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);

and this only returns ERR_PTR() on error.

> + if (!IS_ERR_OR_NULL(pdev))
> + return 0;
> +
> + ret = PTR_ERR(pdev);
> + dev_err(cpu_dev_silver, "Failed to register platform device\n");
> + dev_pm_opp_put_supported_hw(opp_gold);
> +
> +free_opp_silver:
> + dev_pm_opp_put_supported_hw(opp_silver);
> +
> +free_np:
> + of_node_put(np);
> +
> + return ret;
> +}
> +late_initcall(qcom_cpufreq_kryo_driver_init);
> +
> +MODULE_DESCRIPTION("Qualcomm Technologies, Inc. Kryo CPUfreq driver");
> +MODULE_LICENSE("GPL v2");
> --
> 1.9.1

--
viresh

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