realtek: add NAND hardware description to RTL93xx

Include the NAND specs into the DTS. It is unclear which devices
really need it. Keep it disabled for now. As the SoC register area
is defined too small until now, increase the size to an appropriate
value.

If enabled one can see the following log messages (e.g. Linksys
LGS328C or LGS352C).

[    1.206600] spi-nand spi1.0: Macronix SPI NAND was found.
[    1.212795] spi-nand spi1.0: 128 MiB, block size: 128 KiB, page size: 2048, OOB size: 64
[    1.222217] 3 fixed-partitions partitions found on MTD device spi1.0
[    1.229466] OF: Bad cell count for /soc/spi@1a400/flash@0/partitions
[    1.236617] OF: Bad cell count for /soc/spi@1a400/flash@0/partitions
[    1.244164] Creating 3 MTD partitions on "spi1.0":
[    1.249620] 0x000000000000-0x000004000000 : "ubifs"
[    1.423593] 0x000004000000-0x000005e00000 : "firmware"
[    1.738268] mtdsplit_uimage: no uImage found in "firmware"
[    1.744577] 0x000005e00000-0x000007c00000 : "runtime2"

Signed-off-by: Markus Stockhausen <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19583
Signed-off-by: Robert Marko <[email protected]>

target/linux/realtek/dts/rtl930x.dtsi

@@ -59,7 +59,7 @@
 		compatible = "simple-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;
-		ranges = <0x0 0x18000000 0x10000>;
+		ranges = <0x0 0x18000000 0x20000>;
 
 		intc: interrupt-controller@3000 {
 			compatible = "realtek,rtl9300-intc", "realtek,rtl-intc";
@@ -71,6 +71,18 @@
 			interrupts = <2>, <3>, <4>, <5>, <6>, <7>;
 		};
 
+		snand: spi@1a400 {
+			compatible = "realtek,rtl9301-snand";
+			reg = <0x1a400 0x44>;
+			interrupt-parent = <&intc>;
+			interrupts = <19 2>;
+			clocks = <&lx_clk>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			status = "disabled";
+		};
+
 		spi0: spi@1200 {
 			compatible = "realtek,rtl8380-spi";
 			reg = <0x1200 0x100>;

target/linux/realtek/dts/rtl931x.dtsi

@@ -95,7 +95,7 @@
 		compatible = "simple-bus";
 		#address-cells = <1>;
 		#size-cells = <1>;
-		ranges = <0x0 0x18000000 0x10000>;
+		ranges = <0x0 0x18000000 0x20000>;
 
 		spi0: spi@1200 {
 			status = "okay";
@@ -107,6 +107,18 @@
 			#size-cells = <0>;
 		};
 
+		snand: spi@1a400 {
+			compatible = "realtek,rtl9301-snand";
+			reg = <0x1a400 0x44>;
+			interrupt-parent = <&gic>;
+			interrupts = <GIC_SHARED 37 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&lx_clk>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			status = "disabled";
+		};
+
 		watchdog0: watchdog@3260 {
 			compatible = "realtek,rtl9310-wdt";
 			reg = <0x3260 0xc>;