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ARM64: simplify cpu_read_bootcpu_ops using OF/DT helper

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Once the cpu_logical_map for any logical cpu is populated with the
corresponding physical identifier(i.e. mpidr), it's device node can
be retrieved using the DT helper 'of_get_cpu_node'. Currently the
device tree parsing code to get boot cpu node is duplicated in
'cpu_read_bootcpu_ops'.

This patch replaces the code parsing the device tree for the boot
cpu with of_get_cpu_node.

Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Sudeep KarkadaNagesha 2013-10-30 13:47:16 +00:00 committed by Catalin Marinas
parent 6e15d0e04b
commit 248f0e7f5f
1 changed files with 5 additions and 17 deletions
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22
arch/arm64/kernel/cpu_ops.c
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@ -78,22 +78,10 @@ int __init cpu_read_ops(struct device_node *dn, int cpu)
void __init cpu_read_bootcpu_ops(void)
{
struct device_node *dn = NULL;
u64 mpidr = cpu_logical_map(0);
while ((dn = of_find_node_by_type(dn, "cpu"))) {
u64 hwid;
const __be32 *prop;
prop = of_get_property(dn, "reg", NULL);
if (!prop)
continue;
hwid = of_read_number(prop, of_n_addr_cells(dn));
if (hwid == mpidr) {
cpu_read_ops(dn, 0);
of_node_put(dn);
return;
}
struct device_node *dn = of_get_cpu_node(0, NULL);
if (!dn) {
pr_err("Failed to find device node for boot cpu\n");
return;
}
cpu_read_ops(dn, 0);
}