dt-bindings: mmc: loongson,ls2k0500-mmc: Add compatible for Loongson-2K2000

Add the devicetree compatible for Loongson-2K2000 EMMC/SD/SDIO controller.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Reviewed-by: Huacai Chen <chenhuacai@loongson.cn>
Link: https://lore.kernel.org/r/2274fcccd27d7c03bc026fd2a43727bdf5af1ef5.1750765495.git.zhoubinbin@loongson.cn
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: AaronDot

Documentation/devicetree/bindings/mmc/loongson,ls2k0500-mmc.yaml

@@ -9,6 +9,9 @@ title: The SD/SDIO/eMMC host controller for Loongson-2K family SoCs
 description:
   The MMC host controller on the Loongson-2K0500/2K1000 (using an externally
   shared apbdma controller) provides the SD and SDIO device interfaces.
+  The two MMC host controllers on the Loongson-2K2000 are similar,
+  except that they use internal exclusive DMA. one controller provides
+  the eMMC interface and the other provides the SD/SDIO interface.
 
 maintainers:
   - Binbin Zhou <zhoubinbin@loongson.cn>
@@ -21,8 +24,10 @@ properties:
     enum:
       - loongson,ls2k0500-mmc
       - loongson,ls2k1000-mmc
+      - loongson,ls2k2000-mmc
 
   reg:
+    minItems: 1
     items:
       - description: Loongson-2K MMC controller registers.
       - description: APB DMA config register for Loongson-2K MMC controller.
@@ -44,11 +49,31 @@ required:
   - reg
   - interrupts
   - clocks
-  - dmas
-  - dma-names
 
 unevaluatedProperties: false
 
+if:
+  properties:
+    compatible:
+      contains:
+        enum:
+          - loongson,ls2k0500-mmc
+          - loongson,ls2k1000-mmc
+
+then:
+  properties:
+    reg:
+      minItems: 2
+
+  required:
+    - dmas
+    - dma-names
+
+else:
+  properties:
+    reg:
+      maxItems: 1
+
 examples:
   - |
     #include <dt-bindings/gpio/gpio.h>
@@ -67,3 +92,21 @@ examples:
         bus-width = <4>;
         cd-gpios = <&gpio0 22 GPIO_ACTIVE_LOW>;
     };
+
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/clock/loongson,ls2k-clk.h>
+
+    mmc@79990000 {
+        compatible = "loongson,ls2k2000-mmc";
+        reg = <0x79990000 0x1000>;
+        interrupt-parent = <&pic>;
+        interrupts = <51 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clk LOONGSON2_EMMC_CLK>;
+        bus-width = <8>;
+        non-removable;
+        cap-mmc-highspeed;
+        mmc-hs200-1_8v;
+        no-sd;
+        no-sdio;
+    };