The IPIC MSI is introduced on MPC837x chip.
Implements the IPIC MSI as two level interrupt controller.

Signed-off-by: Tony Li <redacted>
---
 arch/powerpc/boot/dts/mpc8377_mds.dts     |   14 ++
 arch/powerpc/boot/dts/mpc8378_mds.dts     |   14 ++
 arch/powerpc/boot/dts/mpc8379_mds.dts     |   14 ++
 arch/powerpc/platforms/83xx/Kconfig       |    6 +
 arch/powerpc/platforms/83xx/mpc837x_mds.c |   11 +
 arch/powerpc/sysdev/Makefile              |    1 +
 arch/powerpc/sysdev/ipic_msi.c            |  359 +++++++++++++++++++++++++++++
 include/asm-powerpc/ipic_msi.h            |   54 +++++
 8 files changed, 473 insertions(+), 0 deletions(-)
 create mode 100644 arch/powerpc/sysdev/ipic_msi.c
 create mode 100644 include/asm-powerpc/ipic_msi.h

diff --git a/arch/powerpc/boot/dts/mpc8377_mds.dts b/arch/powerpc/boot/dts/mpc8377_mds.dts
index 1f7819e..1068fe2 100644
--- a/arch/powerpc/boot/dts/mpc8377_mds.dts
+++ b/arch/powerpc/boot/dts/mpc8377_mds.dts

@@ -210,6 +210,20 @@
 			#interrupt-cells = <2>;
 			reg = <700 100>;
 		};
+
+		ipic-msi@7c0 {
+			compatible = "fsl,ipic-msi";
+			reg = <7c0 40>;
+			interrupts = < 43 8
+				       4  8
+				       51 8
+				       52 8
+				       56 8
+				       57 8
+				       58 8
+				       59 8 >;
+			interrupt-parent = < &ipic >;
+		};