ARM64: juno: disable NOR flash node by default

After discussing on the mailing list it turns out that
accessing the flash memory from the kernel can disrupt CPU
sleep states and CPU hotplugging, so let's disable this
DT node by default. Setups that want to access the flash
can modify this entry to enable the flash again.

Quoting Sudeep Holla: "the firmware assumes the flash is
always in read mode while Linux leaves NOR flash in
"read id" mode after initialization."

Reported-by: Sudeep Holla <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Sudeep Holla <[email protected]>
Cc: Liviu Dudau <[email protected]>
Cc: Lorenzo Pieralisi <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Leif Lindholm <[email protected]>
Cc: Ryan Harkin <[email protected]>
Fixes: 5078f77 "ARM64: juno: add NOR flash to device tree"
Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Olof Johansson <[email protected]>

arch/arm64/boot/dts/arm/juno-motherboard.dtsi

@@ -109,6 +109,13 @@
 				linux,part-probe = "afs";
 				reg = <0 0x00000000 0x04000000>;
 				bank-width = <4>;
+				/*
+				 * Unfortunately, accessing the flash disturbs
+				 * the CPU idle states (suspend) and CPU
+				 * hotplug of the platform. For this reason,
+				 * flash hardware access is disabled by default.
+				 */
+				status = "disabled";
 			};
 
 			ethernet@2,00000000 {