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cpufreq: qoriq: convert to a platform driver

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The driver has to be manually loaded if it is built as a module. It
is neither exporting MODULE_DEVICE_TABLE nor MODULE_ALIAS. Moreover,
no platform-device is created (and thus no uevent is sent) for the
clockgen nodes it depends on.

Convert the module to a platform driver with its own alias. Moreover,
drop whitelisted SOCs. Platform device will be created only for the
compatible platforms.

Reviewed-by: Yuantian Tang <andy.tang@nxp.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Mian Yousaf Kaukab 2020-04-21 10:29:59 +02:00 • committed by Viresh Kumar
parent 2dea651680
commit 157f527639
1 changed files with 30 additions and 48 deletions
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78
drivers/cpufreq/qoriq-cpufreq.c
View file

@ -18,6 +18,7 @@
#include <linux/of.h> #include <linux/of.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/smp.h> #include <linux/smp.h>
#include <linux/platform_device.h>
/** /**
* struct cpu_data * struct cpu_data
@ -29,12 +30,6 @@ struct cpu_data {
struct cpufreq_frequency_table *table; struct cpufreq_frequency_table *table;
}; };
/*
* Don't use cpufreq on this SoC -- used when the SoC would have otherwise
* matched a more generic compatible.
*/
#define SOC_BLACKLIST 1
/** /**
* struct soc_data - SoC specific data * struct soc_data - SoC specific data
* @flags: SOC_xxx * @flags: SOC_xxx
@ -264,64 +259,51 @@ static struct cpufreq_driver qoriq_cpufreq_driver = {
.attr = cpufreq_generic_attr, .attr = cpufreq_generic_attr,
}; };
static const struct soc_data blacklist = { static const struct of_device_id qoriq_cpufreq_blacklist[] = {
.flags = SOC_BLACKLIST,
};
static const struct of_device_id node_matches[] __initconst = {
/* e6500 cannot use cpufreq due to erratum A-008083 */ /* e6500 cannot use cpufreq due to erratum A-008083 */
{ .compatible = "fsl,b4420-clockgen", &blacklist }, { .compatible = "fsl,b4420-clockgen", },
{ .compatible = "fsl,b4860-clockgen", &blacklist }, { .compatible = "fsl,b4860-clockgen", },
{ .compatible = "fsl,t2080-clockgen", &blacklist }, { .compatible = "fsl,t2080-clockgen", },
{ .compatible = "fsl,t4240-clockgen", &blacklist }, { .compatible = "fsl,t4240-clockgen", },
{ .compatible = "fsl,ls1012a-clockgen", },
{ .compatible = "fsl,ls1021a-clockgen", },
{ .compatible = "fsl,ls1028a-clockgen", },
{ .compatible = "fsl,ls1043a-clockgen", },
{ .compatible = "fsl,ls1046a-clockgen", },
{ .compatible = "fsl,ls1088a-clockgen", },
{ .compatible = "fsl,ls2080a-clockgen", },
{ .compatible = "fsl,lx2160a-clockgen", },
{ .compatible = "fsl,p4080-clockgen", },
{ .compatible = "fsl,qoriq-clockgen-1.0", },
{ .compatible = "fsl,qoriq-clockgen-2.0", },
{} {}
}; };
static int __init qoriq_cpufreq_init(void) static int qoriq_cpufreq_probe(struct platform_device *pdev)
{ {
int ret; int ret;
struct device_node *np; struct device_node *np;
const struct of_device_id *match;
const struct soc_data *data;
np = of_find_matching_node(NULL, node_matches); np = of_find_matching_node(NULL, qoriq_cpufreq_blacklist);
if (!np) if (np) {
return -ENODEV; dev_info(&pdev->dev, "Disabling due to erratum A-008083");
match = of_match_node(node_matches, np);
data = match->data;
of_node_put(np);
if (data && data->flags & SOC_BLACKLIST)
return -ENODEV; return -ENODEV;
}
ret = cpufreq_register_driver(&qoriq_cpufreq_driver); ret = cpufreq_register_driver(&qoriq_cpufreq_driver);
if (!ret) if (ret)
pr_info("Freescale QorIQ CPU frequency scaling driver\n"); return ret;
return ret; dev_info(&pdev->dev, "Freescale QorIQ CPU frequency scaling driver\n");
return 0;
} }
module_init(qoriq_cpufreq_init);
static void __exit qoriq_cpufreq_exit(void) static int qoriq_cpufreq_remove(struct platform_device *pdev)
{ {
cpufreq_unregister_driver(&qoriq_cpufreq_driver); cpufreq_unregister_driver(&qoriq_cpufreq_driver);
}
module_exit(qoriq_cpufreq_exit);
return 0;
}
static struct platform_driver qoriq_cpufreq_platform_driver = {
.driver = {
.name = "qoriq-cpufreq",
},
.probe = qoriq_cpufreq_probe,
.remove = qoriq_cpufreq_remove,
};
module_platform_driver(qoriq_cpufreq_platform_driver);
MODULE_ALIAS("platform:qoriq-cpufreq");
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
MODULE_AUTHOR("Tang Yuantian <Yuantian.Tang@freescale.com>"); MODULE_AUTHOR("Tang Yuantian <Yuantian.Tang@freescale.com>");
MODULE_DESCRIPTION("cpufreq driver for Freescale QorIQ series SoCs"); MODULE_DESCRIPTION("cpufreq driver for Freescale QorIQ series SoCs");