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cpuidle: psci: Transition to the faux device interface

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The PSCI cpuidle driver does not require the creation of a platform
device. Originally, this approach was chosen for simplicity when the
driver was first implemented.

With the introduction of the lightweight faux device interface, we now
have a more appropriate alternative. Migrate the driver to utilize the
faux bus, given that the platform device it previously created was not
a real one anyway. This will simplify the code, reducing its footprint
while maintaining functionality.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://patch.msgid.link/20250317-plat2faux_dev-v1-1-5fe67c085ad5@arm.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Sudeep Holla 2025-03-17 10:13:13 +00:00 • committed by Rafael J. Wysocki
parent d4a7882f93
commit af5376a77e
1 changed files with 9 additions and 17 deletions
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26
drivers/cpuidle/cpuidle-psci.c
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@ -16,7 +16,7 @@
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/of.h> #include <linux/of.h>
#include <linux/platform_device.h> #include <linux/device/faux.h>
#include <linux/psci.h> #include <linux/psci.h>
#include <linux/pm_domain.h> #include <linux/pm_domain.h>
#include <linux/pm_runtime.h> #include <linux/pm_runtime.h>
@ -407,14 +407,14 @@ deinit:
* to register cpuidle driver then rollback to cancel all CPUs * to register cpuidle driver then rollback to cancel all CPUs
* registration. * registration.
*/ */
static int psci_cpuidle_probe(struct platform_device *pdev) static int psci_cpuidle_probe(struct faux_device *fdev)
{ {
int cpu, ret; int cpu, ret;
struct cpuidle_driver *drv; struct cpuidle_driver *drv;
struct cpuidle_device *dev; struct cpuidle_device *dev;
for_each_present_cpu(cpu) { for_each_present_cpu(cpu) {
ret = psci_idle_init_cpu(&pdev->dev, cpu); ret = psci_idle_init_cpu(&fdev->dev, cpu);
if (ret) if (ret)
goto out_fail; goto out_fail;
} }
@ -434,26 +434,18 @@ out_fail:
return ret; return ret;
} }
static struct platform_driver psci_cpuidle_driver = { static struct faux_device_ops psci_cpuidle_ops = {
.probe = psci_cpuidle_probe, .probe = psci_cpuidle_probe,
.driver = {
.name = "psci-cpuidle",
},
}; };
static int __init psci_idle_init(void) static int __init psci_idle_init(void)
{ {
struct platform_device *pdev; struct faux_device *fdev;
int ret;
ret = platform_driver_register(&psci_cpuidle_driver); fdev = faux_device_create("psci-cpuidle", NULL, &psci_cpuidle_ops);
if (ret) if (!fdev) {
return ret; pr_err("Failed to create psci-cpuidle device\n");
return -ENODEV;
pdev = platform_device_register_simple("psci-cpuidle", -1, NULL, 0);
if (IS_ERR(pdev)) {
platform_driver_unregister(&psci_cpuidle_driver);
return PTR_ERR(pdev);
} }
return 0; return 0;