Add spi support.

Reviewed-by: Huacai Chen <chenhua...@kernel.org>
Signed-off-by: Qing Zhang <zhangq...@loongson.cn>
---

v2:
- Add spi about pci device DT

v3:
- Remove spiflash node

v4:
- Remove useless compatible

v5:
- Remove num-chipselects

v6:
- No changes

---
 arch/mips/boot/dts/loongson/ls7a-pch.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi 
b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
index f99a7a1..dba717d 100644
--- a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
+++ b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
@@ -405,6 +405,15 @@
                                interrupt-map-mask = <0 0 0 0>;
                                interrupt-map = <0 0 0 0 &pic 39 
IRQ_TYPE_LEVEL_HIGH>;
                        };
+
+                       spi@16,0 {
+                               compatible = "pci0014,7a0b.0",
+                                                  "pci0014,7a0b",
+                                                  "pciclass088000",
+                                                  "pciclass0880";
+
+                               reg = <0xb000 0x0 0x0 0x0 0x0>;
+                       };
                };
 
                isa {
-- 
2.1.0

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