ARM: mvebu: remove device tree parsing for cpu nodes

Currently set_secondary_cpus_clock assume the CPU logical ordering
and the MPDIR in DT are same, which is incorrect.

Since the CPU device nodes can be retrieved in the logical ordering
using the DT helper, we can remove the devices tree parsing.

This patch removes DT parsing by making use of of_get_cpu_node.

Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Jason Cooper <jason@lakedaemon.net>
Acked-by: Gregory Clement <gregory.clement@free-electrons.com>
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>

diff --git a/arch/arm/mach-mvebu/platsmp.c b/arch/arm/mach-mvebu/platsmp.c
index ce81d303140598debb8e5cb9c6bb557e28268f49..594b63db421597f78021a3bf736fa81de6a79afe 100644 (file)
--- a/arch/arm/mach-mvebu/platsmp.c
+++ b/arch/arm/mach-mvebu/platsmp.c
@@ -29,45 +29,40 @@
 #include "pmsu.h"
 #include "coherency.h"
 
+static struct clk *__init get_cpu_clk(int cpu)
+{
+       struct clk *cpu_clk;
+       struct device_node *np = of_get_cpu_node(cpu, NULL);
+
+       if (WARN(!np, "missing cpu node\n"))
+               return NULL;
+       cpu_clk = of_clk_get(np, 0);
+       if (WARN_ON(IS_ERR(cpu_clk)))
+               return NULL;
+       return cpu_clk;
+}
+
 void __init set_secondary_cpus_clock(void)
 {
-       int thiscpu;
+       int thiscpu, cpu;
        unsigned long rate;
-       struct clk *cpu_clk = NULL;
-       struct device_node *np = NULL;
+       struct clk *cpu_clk;
 
        thiscpu = smp_processor_id();
-       for_each_node_by_type(np, "cpu") {
-               int err;
-               int cpu;
-
-               err = of_property_read_u32(np, "reg", &cpu);
-               if (WARN_ON(err))
-                       return;
-
-               if (cpu == thiscpu) {
-                       cpu_clk = of_clk_get(np, 0);
-                       break;
-               }
-       }
-       if (WARN_ON(IS_ERR(cpu_clk)))
+       cpu_clk = get_cpu_clk(thiscpu);
+       if (!cpu_clk)
                return;
        clk_prepare_enable(cpu_clk);
        rate = clk_get_rate(cpu_clk);
 
        /* set all the other CPU clk to the same rate than the boot CPU */
-       for_each_node_by_type(np, "cpu") {
-               int err;
-               int cpu;
-
-               err = of_property_read_u32(np, "reg", &cpu);
-               if (WARN_ON(err))
+       for_each_possible_cpu(cpu) {
+               if (cpu == thiscpu)
+                       continue;
+               cpu_clk = get_cpu_clk(cpu);
+               if (!cpu_clk)
                        return;
-
-               if (cpu != thiscpu) {
-                       cpu_clk = of_clk_get(np, 0);
-                       clk_set_rate(cpu_clk, rate);
-               }
+               clk_set_rate(cpu_clk, rate);
        }
 }