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Message-ID: <CADGdYn7yqFYxz6OENhTfpkj2_1mUBdu-HM1U=AbDft=XPbTPfQ@mail.gmail.com>
Date: Mon, 11 Mar 2013 09:13:24 +0530
From: amit kachhap <amit.kachhap@...il.com>
To: Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
"Rafael J. Wysocki" <rjw@...k.pl>,
linux-samsung-soc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
Kukjin Kim <kgene.kim@...sung.com>,
Thomas Abraham <thomas.abraham@...aro.org>,
cpufreq@...r.kernel.org,
Inderpal Singh <inderpal.singh@...aro.org>,
Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH V3 1/4] cpufreq: exynos: Adding cpufreq driver for exynos5440
Hi Sylwester,
Thanks for the review. Will update with your suggestion in the next version,
Thanks,
Amit D
On Thu, Mar 7, 2013 at 8:58 PM, Sylwester Nawrocki
<s.nawrocki@...sung.com> wrote:
> On 03/07/2013 05:13 AM, Amit Daniel Kachhap wrote:
>> +/* Register definations */
>
> s/definations/definitions
ok
>
>> +#define XMU_DVFS_CTRL 0x0060
>> +#define XMU_PMU_P0_7 0x0064
>> +#define XMU_C0_3_PSTATE 0x0090
>> +#define XMU_P_LIMIT 0x00A0
>> +#define XMU_P_STATUS 0x00A4
>> +#define XMU_PMUEVTEN 0x00D0
>> +#define XMU_PMUIRQEN 0x00D4
>> +#define XMU_PMUIRQ 0x00D8
>
> Keeping all hex numbers lower case might be a good idea.
Ok
>
>> +
>> +/* PMU mask and shift definations */
>> +#define P_VALUE_MASK 0x7
>> +
>> +#define XMU_DVFS_CTRL_EN_SHIFT 0
>> +
>> +#define P0_7_CPUCLKDEV_SHIFT 21
>> +#define P0_7_CPUCLKDEV_MASK 0x7
>> +#define P0_7_ATBCLKDEV_SHIFT 18
>> +#define P0_7_ATBCLKDEV_MASK 0x7
>> +#define P0_7_CSCLKDEV_SHIFT 15
>> +#define P0_7_CSCLKDEV_MASK 0x7
>> +#define P0_7_CPUEMA_SHIFT 28
>> +#define P0_7_CPUEMA_MASK 0xf
>> +#define P0_7_L2EMA_SHIFT 24
>> +#define P0_7_L2EMA_MASK 0xf
> ...
>> +static int exynos_cpufreq_probe(struct platform_device *pdev)
>> +{
>> + int ret = -EINVAL;
>> + struct device_node *np;
>> + struct resource res;
>> +
>> + np = of_find_compatible_node(NULL, NULL, "samsung,exynos5440-cpufreq");
>> + if (!np)
>> + return -ENODEV;
>> +
>> + dvfs_info = devm_kzalloc(&pdev->dev, sizeof(*dvfs_info), GFP_KERNEL);
>> + if (!dvfs_info) {
>> + ret = -ENOMEM;
>> + goto err_put_node;
>> + }
>> +
>> + dvfs_info->dev = &pdev->dev;
>> + dvfs_info->dev->of_node = np;
>> +
>> + ret = of_address_to_resource(np, 0, &res);
>> + if (ret)
>> + goto err_put_node;
>> +
>> + dvfs_info->base = devm_ioremap(dvfs_info->dev, res.start,
>
> There is a devm_ioremap_resource() function that has been introduced
> recently. It could simplify this code a bit and is preferred over
> devm_ioremap().
yes right. I somehow missed this api.
>
>> + resource_size(&res));
>> + if (!dvfs_info->base) {
>> + pr_err("No cpufreq memory map found\n");
>> + ret = -ENODEV;
>> + goto err_put_node;
>> + }
>> +
>> + dvfs_info->irq = irq_of_parse_and_map(np, 0);
>> + if (dvfs_info->irq == 0) {
>> + pr_err("No cpufreq irq found\n");
>
> Wouldn't dev_err() be more appropriate here ?
Ok
>
>> + ret = -ENODEV;
>> + goto err_put_node;
>> + }
>> +
>> + ret = of_init_opp_table(dvfs_info->dev);
>> + if (ret) {
>> + pr_err("failed to init OPP table: %d\n", ret);
>> + goto err_put_node;
>> + }
>> +
>> + ret = opp_init_cpufreq_table(dvfs_info->dev, &dvfs_info->freq_table);
>> + if (ret) {
>> + pr_err("failed to init cpufreq table: %d\n", ret);
>> + goto err_put_node;
>> + }
>> + dvfs_info->freq_count = opp_get_opp_count(dvfs_info->dev);
>> + exynos_sort_descend_freq_table();
>> +
>> + if (of_property_read_u32(np, "clock-latency", &dvfs_info->latency))
>> + dvfs_info->latency = DEF_TRANS_LATENCY;
>> +
>> + dvfs_info->cpu_clk = devm_clk_get(dvfs_info->dev, "armclk");
>> + if (IS_ERR_OR_NULL(dvfs_info->cpu_clk)) {
>
> devm_clk_get() return value needs to be checked with IS_ERR(),
> not IS_ERR_OR_NULL().
ok
>
>> + pr_err("Failed to get cpu clock\n");
>> + ret = PTR_ERR(dvfs_info->cpu_clk);
>> + goto err_free_table;
>> + }
>> +
>> + dvfs_info->cur_frequency = clk_get_rate(dvfs_info->cpu_clk);
>> + if (!dvfs_info->cur_frequency) {
>> + pr_err("Failed to get clock rate\n");
>> + ret = -EINVAL;
>> + goto err_free_table;
>> + }
>> + dvfs_info->cur_frequency /= 1000;
>> +
>> + INIT_WORK(&dvfs_info->irq_work, exynos_cpufreq_work);
>> + if (devm_request_irq(dvfs_info->dev, dvfs_info->irq, exynos_cpufreq_irq,
>> + IRQF_TRIGGER_NONE, CPUFREQ_NAME, dvfs_info)) {
>> + pr_err("Failed to register IRQ\n");
>> + ret = -ENODEV;
>> + goto err_free_table;
>> + }
>> +
>> + ret = init_div_table();
>> + if (ret) {
>> + pr_err("Failed to initialise div table\n");
>> + goto err_free_table;
>> + }
>> +
>> + exynos_enable_dvfs();
>> + ret = cpufreq_register_driver(&exynos_driver);
>> + if (ret) {
>> + pr_err("%s: failed to register cpufreq driver\n", __func__);
>> + goto err_free_table;
>> + }
>> +
>> + of_node_put(np);
>> + dvfs_info->dvfs_enable = true;
>> + pr_info("exynos5440 DVFS initialized.\n");
>
> dev_info() ?
>
>> + return 0;
>> +
>> +err_free_table:
>> + opp_free_cpufreq_table(dvfs_info->dev, &dvfs_info->freq_table);
>> +err_put_node:
>> + of_node_put(np);
>> + pr_err("%s: failed initialization\n", __func__);
>
> Is this really needed ? This failure will be logged by the driver core
> anyway.
>
>> + return ret;
>> +
> --
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