MIPS: generic: Convert SEAD-3 to a generic board

Convert the MIPS SEAD-3 board support to be a generic board, supported
by generic kernels.

Because the SEAD-3 boot protocol was defined long ago and we don't want
to force a switch to the UHI protocol, SEAD-3 is added as a legacy board
which is detected by reading the REVISION register. This may technically
not be a valid memory read & future work will include attempting to
handle that gracefully. In practice since SEAD-3 is the only legacy
board supported by the generic kernel so far the read will only happen
on SEAD-3 boards, and even once Malta is converted the same REVISION
register exists there too. Other boards such as Boston, Ci20 & Ci40 will
use the UHI boot protocol & thus not run any of the legacy board detect
functions.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14354/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 2 insertions, 1 deletions

diff --git a/arch/mips/boot/dts/mti/Makefile b/arch/mips/boot/dts/mti/Makefile
index 144d776cc9f2..fcabd69b7030 100644
--- a/arch/mips/boot/dts/mti/Makefile
+++ b/arch/mips/boot/dts/mti/Makefile
@@ -1,5 +1,5 @@
 dtb-$(CONFIG_MIPS_MALTA)        += malta.dtb
-dtb-$(CONFIG_MIPS_SEAD3)        += sead3.dtb
+dtb-$(CONFIG_LEGACY_BOARD_SEAD3)        += sead3.dtb
 
 obj-y                           += $(patsubst %.dtb, %.dtb.o, $(dtb-y))
 
diff --git a/arch/mips/boot/dts/mti/sead3.dts b/arch/mips/boot/dts/mti/sead3.dts
index 2579ca51c0b6..b112879a5d9d 100644
--- a/arch/mips/boot/dts/mti/sead3.dts
+++ b/arch/mips/boot/dts/mti/sead3.dts
@@ -10,6 +10,7 @@
         #address-cells = <1>;
         #size-cells = <1>;
         compatible = "mti,sead-3";
+        model = "MIPS SEAD-3";
         interrupt-parent = <&gic>;
 
         chosen {