[Xen-devel] [RFC PATCH v2 5/8] cpufreq: cpufreq-cpu0: change cpus data path in devtree for Dom0 kernel

[Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>]

Xen hypervisor creates standard cpus nodes for virtual cpus.
All information needed for this driver about physical cpus
now located in /hypervisor/pcpus node instead of the
/cpus node in case if kernel is running as Dom0 domain.

Signed-off-by: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>
---
 drivers/cpufreq/cpufreq-cpu0.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c
index ef4fbc4..a83838b 100644
--- a/drivers/cpufreq/cpufreq-cpu0.c
+++ b/drivers/cpufreq/cpufreq-cpu0.c
@@ -21,6 +21,8 @@
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 
+#include <xen/xen.h>
+
 static unsigned int transition_latency;
 static unsigned int voltage_tolerance; /* in percentage */
 
@@ -182,7 +184,13 @@ static int cpu0_cpufreq_probe(struct platform_device *pdev)
        struct device_node *np;
        int ret;
 
-       np = of_find_node_by_path("/cpus/cpu@0");
+#ifdef CONFIG_XEN_DOM0
+       if (xen_initial_domain())
+               np = of_find_node_by_path("/hypervisor/pcpus/cpu@0");
+       else
+#endif
+               np = of_find_node_by_path("/cpus/cpu@0");
+
        if (!np) {
                pr_err("failed to find cpu0 node\n");
                return -ENOENT;
-- 
1.9.1


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