ARM: l2c: check that DT files specify the required "cache-unified" property

This is a required property, and should always be specified.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/arm/mm/cache-l2x0.c b/arch/arm/mm/cache-l2x0.c
index c5c8a4152825..790343b2c13b 100644
--- a/arch/arm/mm/cache-l2x0.c
+++ b/arch/arm/mm/cache-l2x0.c
@@ -1364,6 +1364,10 @@ int __init l2x0_of_init(u32 aux_val, u32 aux_mask)
 
         data = of_match_node(l2x0_ids, np)->data;
 
+        /* All L2 caches are unified, so this property should be specified */
+        if (!of_property_read_bool(np, "cache-unified"))
+                pr_err("L2C: device tree omits to specify unified cache\n");
+
         /* L2 configuration can only be changed if the cache is disabled */
         if (!(readl_relaxed(l2x0_base + L2X0_CTRL) & L2X0_CTRL_EN))
                 if (data->of_parse)