[PATCH 02/12] ARM: Use of_get_cpu_hwid()

Rob Herring
2021-10-06T16:43:45Z

Replace the open coded parsing of CPU nodes' 'reg' property with
of_get_cpu_hwid().

This change drops an error message for missing 'reg' property, but that
should not be necessary as the DT tools will ensure 'reg' is present.

Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Rob Herring <robh@kernel.org>
---
arch/arm/kernel/devtree.c | 22 ++--------------------
1 file changed, 2 insertions(+), 20 deletions(-)

diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c
index 28311dd0fee6..02839d8b6202 100644
--- a/arch/arm/kernel/devtree.c
+++ b/arch/arm/kernel/devtree.c
@@ -84,33 +84,15 @@ void __init arm_dt_init_cpu_maps(void)
return;

for_each_of_cpu_node(cpu) {
- const __be32 *cell;
- int prop_bytes;
- u32 hwid;
+ u32 hwid = of_get_cpu_hwid(cpu, 0);

pr_debug(" * %pOF...\n", cpu);
- /*
- * A device tree containing CPU nodes with missing "reg"
- * properties is considered invalid to build the
- * cpu_logical_map.
- */
- cell = of_get_property(cpu, "reg", &prop_bytes);
- if (!cell || prop_bytes < sizeof(*cell)) {
- pr_debug(" * %pOF missing reg property\n", cpu);
- of_node_put(cpu);
- return;
- }

/*
* Bits n:24 must be set to 0 in the DT since the reg property
* defines the MPIDR[23:0].
*/
- do {
- hwid = be32_to_cpu(*cell++);
- prop_bytes -= sizeof(*cell);
- } while (!hwid && prop_bytes > 0);
-
- if (prop_bytes || (hwid & ~MPIDR_HWID_BITMASK)) {
+ if (hwid & ~MPIDR_HWID_BITMASK) {
of_node_put(cpu);
return;
}
--
2.30.2