[CELL] pmi: remove support for mutiple devices.

The pmi driver got simplified by removing support for multiple devices.
As there is no more than one pmi device per maschine, there is no need to
specify the device for listening and sending messages.

This way the caller (cbe_cpufreq) doesn't need to scan the device tree.
When registering the handler on a board without a pmi
interface, pmi.c will just return -ENODEV.

The patch that fixed the breakage of cell_defconfig has been
broken out of the earlier version of this patch. So this is
the version that applies cleanly on top of it.

Signed-off-by: Christian Krafft <krafft@de.ibm.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

1 files changed, 14 insertions, 22 deletions

diff --git a/arch/powerpc/platforms/cell/cbe_cpufreq.c b/arch/powerpc/platforms/cell/cbe_cpufreq.c
index ab511d5b65a4..3586f5290490 100644
--- a/arch/powerpc/platforms/cell/cbe_cpufreq.c
+++ b/arch/powerpc/platforms/cell/cbe_cpufreq.c
@@ -68,11 +68,12 @@ static u64 MIC_Slow_Next_Timer_table[] = {
 };
 
 static unsigned int pmi_frequency_limit = 0;
+
 /*
  * hardware specific functions
  */
 
-static struct of_device *pmi_dev;
+static bool cbe_cpufreq_has_pmi;
 
 #ifdef CONFIG_PPC_PMI
 static int set_pmode_pmi(int cpu, unsigned int pmode)
@@ -91,7 +92,7 @@ static int set_pmode_pmi(int cpu, unsigned int pmode)
 	time = (u64) get_cycles();
 #endif
 
-	pmi_send_message(pmi_dev, pmi_msg);
+	pmi_send_message(pmi_msg);
 	ret = pmi_msg.data2;
 
 	pr_debug("PMI returned slow mode %d\n", ret);
@@ -157,16 +158,16 @@ static int set_pmode_reg(int cpu, unsigned int pmode)
 	return 0;
 }
 
-static int set_pmode(int cpu, unsigned int slow_mode) {
+static int set_pmode(int cpu, unsigned int slow_mode)
+{
 #ifdef CONFIG_PPC_PMI
-	if (pmi_dev)
+	if (cbe_cpufreq_has_pmi)
 		return set_pmode_pmi(cpu, slow_mode);
-	else
 #endif
-		return set_pmode_reg(cpu, slow_mode);
+	return set_pmode_reg(cpu, slow_mode);
 }
 
-static void cbe_cpufreq_handle_pmi(struct of_device *dev, pmi_message_t pmi_msg)
+static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg)
 {
 	u8 cpu;
 	u8 cbe_pmode_new;
@@ -253,7 +254,7 @@ static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
 
 	cpufreq_frequency_table_get_attr(cbe_freqs, policy->cpu);
 
-	if (pmi_dev) {
+	if (cbe_cpufreq_has_pmi) {
 		/* frequency might get limited later, initialize limit with max_freq */
 		pmi_frequency_limit = max_freq;
 		cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
@@ -265,7 +266,7 @@ static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
 
 static int cbe_cpufreq_cpu_exit(struct cpufreq_policy *policy)
 {
-	if (pmi_dev)
+	if (cbe_cpufreq_has_pmi)
 		cpufreq_unregister_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
 
 	cpufreq_frequency_table_put_attr(policy->cpu);
@@ -326,29 +327,20 @@ static struct cpufreq_driver cbe_cpufreq_driver = {
 
 static int __init cbe_cpufreq_init(void)
 {
-#ifdef CONFIG_PPC_PMI
-	struct device_node *np;
-#endif
 	if (!machine_is(cell))
 		return -ENODEV;
-#ifdef CONFIG_PPC_PMI
-	np = of_find_node_by_type(NULL, "ibm,pmi");
 
-	pmi_dev = of_find_device_by_node(np);
+	cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0;
 
-	if (pmi_dev)
-		pmi_register_handler(pmi_dev, &cbe_pmi_handler);
-#endif
 	return cpufreq_register_driver(&cbe_cpufreq_driver);
 }
 
 static void __exit cbe_cpufreq_exit(void)
 {
-#ifdef CONFIG_PPC_PMI
-	if (pmi_dev)
-		pmi_unregister_handler(pmi_dev, &cbe_pmi_handler);
-#endif
 	cpufreq_unregister_driver(&cbe_cpufreq_driver);
+
+	if (cbe_cpufreq_has_pmi)
+		pmi_unregister_handler(&cbe_pmi_handler);
 }
 
 module_init(cbe_cpufreq_init);