powerpc/microwatt: Add mmu bits to device tree

In commit 5402e239d09f ("powerpc/64s: Get LPID bit width from device
tree") the kernel tried to determine the pid and lpid bits from the
device tree. If they are not found, there is a fallback, but Microwatt
wasn't covered as it has the unusual configuration of being both !HV and
bare metal.

Set the values in the device tree to avoid having to add a special case.
The lpid value is the only one required, but add both for completeness.

Fixes: 5402e239d09f ("powerpc/64s: Get LPID bit width from device tree")
Signed-off-by: Joel Stanley <joel@jms.id.au>
Acked-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220519125706.593532-1-joel@jms.id.au

diff --git a/arch/powerpc/boot/dts/microwatt.dts b/arch/powerpc/boot/dts/microwatt.dts
index 65b270a90f9450cf2c330bacc558cb559b83ce4f..b69db1d275cd60f1db0950b578e6508a5d4b8d56 100644 (file)
--- a/arch/powerpc/boot/dts/microwatt.dts
+++ b/arch/powerpc/boot/dts/microwatt.dts
@@ -90,6 +90,8 @@
                        64-bit;
                        d-cache-size = <0x1000>;
                        ibm,chip-id = <0>;
+                       ibm,mmu-lpid-bits = <12>;
+                       ibm,mmu-pid-bits = <20>;
                };
        };