linux-kernel - Re: [PATCH 6/6] cpufreq: Loongson1: Add cpufreq driver for Loongson1B (UPDATED)

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Message-ID: <CAKohpok9T1mT0Pb9ue0Pe8SMo4e6DEXzBn2mPoTo2rUHG+MTXQ@mail.gmail.com>
Date:	Thu, 16 Oct 2014 13:53:19 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Kelvin Cheung <keguang.zhang@...il.com>
Cc:	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, linux-mips@...ux-mips.org,
	Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH 6/6] cpufreq: Loongson1: Add cpufreq driver for Loongson1B (UPDATED)

This is not how we send updated versions, GIT and other tools will commit
the "(UPDATED)" part while applying. What you were required to do was
something like:

git format-patch A..B --subject-prefix="PATCH V2"

On 15 October 2014 12:53, Kelvin Cheung <keguang.zhang@...il.com> wrote:
> +static int ls1x_cpufreq_remove(struct platform_device *pdev)
> +{
> +       cpufreq_unregister_notifier(&ls1x_cpufreq_notifier_block,
> +                                   CPUFREQ_TRANSITION_NOTIFIER);
> +       cpufreq_unregister_driver(&ls1x_cpufreq_driver);
> +       clk_put(ls1x_cpufreq.osc_clk);
> +       clk_put(ls1x_cpufreq.clk);
> +
> +       return 0;
> +}
> +
> +static int ls1x_cpufreq_probe(struct platform_device *pdev)
> +{
> +       struct plat_ls1x_cpufreq *pdata = pdev->dev.platform_data;
> +       struct clk *clk;
> +       int ret;
> +
> +       if (!pdata)
> +               return -EINVAL;
> +       if (!pdata->clk_name)
> +               return -EINVAL;
> +       if (!pdata->osc_clk_name)
> +               return -EINVAL;

I didn't wanted you to do this, You could have done this:

       if (!pdata || !pdata->clk_name || !pdata->osc_clk_name)
               return -EINVAL;

So, just a || instead of && :)

> +
> +       ls1x_cpufreq.dev = &pdev->dev;
> +
> +       clk = clk_get(NULL, pdata->clk_name);

I believe we agreed for devm_clk_get(), isn't it ?

> +       if (IS_ERR(clk)) {
> +               dev_err(ls1x_cpufreq.dev, "unable to get %s clock\n",
> +                       pdata->clk_name);
> +               ret = PTR_ERR(clk);
> +               goto out;
> +       }
> +       ls1x_cpufreq.clk = clk;
> +
> +       clk = clk_get_parent(clk);
> +       if (IS_ERR(clk)) {
> +               dev_err(ls1x_cpufreq.dev, "unable to get parent of %s clock\n",
> +                       __clk_get_name(ls1x_cpufreq.clk));
> +               ret = PTR_ERR(clk);
> +               goto err_mux;
> +       }
> +       ls1x_cpufreq.mux_clk = clk;
> +
> +       clk = clk_get_parent(clk);
> +       if (IS_ERR(clk)) {
> +               dev_err(ls1x_cpufreq.dev, "unable to get parent of %s clock\n",
> +                       __clk_get_name(ls1x_cpufreq.mux_clk));
> +               ret = PTR_ERR(clk);
> +               goto err_mux;
> +       }
> +       ls1x_cpufreq.pll_clk = clk;
> +
> +       clk = clk_get(NULL, pdata->osc_clk_name);
> +       if (IS_ERR(clk)) {
> +               dev_err(ls1x_cpufreq.dev, "unable to get %s clock\n",
> +                       pdata->osc_clk_name);
> +               ret = PTR_ERR(clk);
> +               goto err_mux;
> +       }
> +       ls1x_cpufreq.osc_clk = clk;
> +
> +       ls1x_cpufreq.max_freq = pdata->max_freq;
> +       ls1x_cpufreq.min_freq = pdata->min_freq;
> +
> +       ret = cpufreq_register_driver(&ls1x_cpufreq_driver);
> +       if (ret) {
> +               dev_err(ls1x_cpufreq.dev,
> +                       "failed to register cpufreq driver: %d\n", ret);
> +               goto err_driver;
> +       }
> +
> +       ret = cpufreq_register_notifier(&ls1x_cpufreq_notifier_block,
> +                                       CPUFREQ_TRANSITION_NOTIFIER);
> +
> +       if (!ret)
> +               goto out;
> +
> +       dev_err(ls1x_cpufreq.dev, "failed to register cpufreq notifier: %d\n",
> +               ret);
> +
> +       cpufreq_unregister_driver(&ls1x_cpufreq_driver);
> +err_driver:
> +       clk_put(ls1x_cpufreq.osc_clk);
> +err_mux:
> +       clk_put(ls1x_cpufreq.clk);
> +out:
> +       return ret;
> +}
> +
> +static struct platform_driver ls1x_cpufreq_platdrv = {
> +       .driver = {
> +               .name   = "ls1x-cpufreq",
> +               .owner  = THIS_MODULE,
> +       },
> +       .probe          = ls1x_cpufreq_probe,
> +       .remove         = ls1x_cpufreq_remove,
> +};
> +
> +module_platform_driver(ls1x_cpufreq_platdrv);
> +
> +MODULE_AUTHOR("Kelvin Cheung <keguang.zhang@...il.com>");
> +MODULE_DESCRIPTION("Loongson 1 CPUFreq driver");
> +MODULE_LICENSE("GPL");
> --
> 1.9.1
>
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