[PATCH 20/22] soc/fsl/qbman: Convert to hotplug state machine

[Sebastian Andrzej Siewior]

Install the callbacks via the state machine.

Cc: Claudiu Manoil <claudiu.man...@nxp.com>
Cc: Scott Wood <o...@buserror.net>
Cc: Roy Pledge <roy.ple...@nxp.com>
Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
 drivers/soc/fsl/qbman/qman_portal.c | 39 ++++++++++++-------------------------
 1 file changed, 12 insertions(+), 27 deletions(-)

diff --git a/drivers/soc/fsl/qbman/qman_portal.c 
b/drivers/soc/fsl/qbman/qman_portal.c
index 148614388fca..d068e4820f49 100644
--- a/drivers/soc/fsl/qbman/qman_portal.c
+++ b/drivers/soc/fsl/qbman/qman_portal.c
@@ -179,7 +179,7 @@ static void qman_portal_update_sdest(const struct 
qm_portal_config *pcfg,
        qman_set_sdest(pcfg->channel, cpu);
 }
 
-static void qman_offline_cpu(unsigned int cpu)
+static int qman_offline_cpu(unsigned int cpu)
 {
        struct qman_portal *p;
        const struct qm_portal_config *pcfg;
@@ -192,9 +192,10 @@ static void qman_offline_cpu(unsigned int cpu)
                        qman_portal_update_sdest(pcfg, 0);
                }
        }
+       return 0;
 }
 
-static void qman_online_cpu(unsigned int cpu)
+static int qman_online_cpu(unsigned int cpu)
 {
        struct qman_portal *p;
        const struct qm_portal_config *pcfg;
@@ -207,31 +208,9 @@ static void qman_online_cpu(unsigned int cpu)
                        qman_portal_update_sdest(pcfg, cpu);
                }
        }
+       return 0;
 }
 
-static int qman_hotplug_cpu_callback(struct notifier_block *nfb,
-                                    unsigned long action, void *hcpu)
-{
-       unsigned int cpu = (unsigned long)hcpu;
-
-       switch (action) {
-       case CPU_ONLINE:
-       case CPU_ONLINE_FROZEN:
-               qman_online_cpu(cpu);
-               break;
-       case CPU_DOWN_PREPARE:
-       case CPU_DOWN_PREPARE_FROZEN:
-               qman_offline_cpu(cpu);
-       default:
-               break;
-       }
-       return NOTIFY_OK;
-}
-
-static struct notifier_block qman_hotplug_cpu_notifier = {
-       .notifier_call = qman_hotplug_cpu_callback,
-};
-
 static int qman_portal_probe(struct platform_device *pdev)
 {
        struct device *dev = &pdev->dev;
@@ -346,8 +325,14 @@ static int __init qman_portal_driver_register(struct 
platform_driver *drv)
        if (ret < 0)
                return ret;
 
-       register_hotcpu_notifier(&qman_hotplug_cpu_notifier);
-
+       ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
+                                       "soc/qman_portal:online",
+                                       qman_online_cpu, qman_offline_cpu);
+       if (ret < 0) {
+               pr_err("qman: failed to register hotplug callbacks.\n");
+               platform_driver_unregister(drv);
+               return ret;
+       }
        return 0;
 }
 
-- 
2.10.2