bcm63xx: Add support for D-Link DSL-2750u rev C1

This adds support for the D-Link DSL-2750u rev C1.
(https://deviwiki.com/wiki/D-Link_DSL-2750U_rev_C1)

It uses the same hardware as ADB P.DG A4001N.
CPU:   Broadcom BCM63281 (320 MHz)
RAM:   32M (Winbond W9725G6JB)
Flash:   8M (MXIC MX25L6445E)
Ethernet:   4x 100 Mbps
Wireless:   802.11b/g/n: BCM43225
USB:   1x 2.0

Flash instructions:

1.  Assign static IP 192.168.1.100 to PC
2.  Unplug the power source
3.  Press the RESET button at the router, don't release it yet!
4.  Plug the power source.Wait some seconds
5.  Release the RESET button
6.  Browse to http://192.168.1.1
7.  Send the openwrt-bcm63xx-generic-DSL2750U-C1-squashfs-cfe.bin and
    wait some minutes until the firmware upgrade finish.

Signed-off-by: Ahmed Naseef <naseefkm@gmail.com>
[DTS improvements, proper board patch, refresh patches]
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

13 files changed, 171 insertions, 9 deletions

diff --git a/target/linux/bcm63xx/base-files/etc/board.d/01_leds b/target/linux/bcm63xx/base-files/etc/board.d/01_leds
index cfd4cf3c317..bdd69340239 100755
--- a/target/linux/bcm63xx/base-files/etc/board.d/01_leds
+++ b/target/linux/bcm63xx/base-files/etc/board.d/01_leds
@@ -16,6 +16,7 @@ actiontec,r1000h)
 adb,a4001n|\
 comtrend,ar-5315u|\
 comtrend,vr-3032u|\
+d-link,dsl-2750u-c1|\
 huawei,hg253s-v2|\
 nucom,r5010un-v2|\
 sagem,fast-2704-v2)
diff --git a/target/linux/bcm63xx/base-files/etc/board.d/02_network b/target/linux/bcm63xx/base-files/etc/board.d/02_network
index f02eabe68fd..711b8f8c002 100755
--- a/target/linux/bcm63xx/base-files/etc/board.d/02_network
+++ b/target/linux/bcm63xx/base-files/etc/board.d/02_network
@@ -31,6 +31,7 @@ comtrend,vr-3025u|\
 comtrend,vr-3025un|\
 comtrend,vr-3026e|\
 d-link,dsl-274xb-f1|\
+d-link,dsl-2750u-c1|\
 d-link,dsl-275xb-d1|\
 huawei,echolife-hg622|\
 huawei,echolife-hg655b|\
diff --git a/target/linux/bcm63xx/dts/bcm6328-d-link-dsl-2750u-c1.dts b/target/linux/bcm63xx/dts/bcm6328-d-link-dsl-2750u-c1.dts
new file mode 100644
index 00000000000..09152150392
--- /dev/null
+++ b/target/linux/bcm63xx/dts/bcm6328-d-link-dsl-2750u-c1.dts
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+#include "bcm6328.dtsi"
+
+#include <dt-bindings/input/input.h>
+
+/ {
+	model = "D-Link DSL-2750U rev C1";
+	compatible = "d-link,dsl-2750u-c1", "brcm,bcm6328";
+
+	aliases {
+		led-boot = &led_power_green;
+		led-failsafe = &led_power_green;
+		led-running = &led_power_green;
+		led-upgrade = &led_power_green;
+	};
+
+	chosen {
+		bootargs = "rootfstype=squashfs,jffs2 noinitrd console=ttyS0,115200";
+		stdout-path = "serial0:115200n8";
+	};
+
+	keys {
+		compatible = "gpio-keys-polled";
+		poll-interval = <20>;
+
+		wifi {
+			label = "wifi";
+			gpios = <&pinctrl 12 1>;
+			linux,code = <KEY_WLAN>;
+			debounce-interval = <60>;
+		};
+
+		reset {
+			label = "reset";
+			gpios = <&pinctrl 23 1>;
+			linux,code = <KEY_RESTART>;
+			debounce-interval = <60>;
+		};
+
+		wps {
+			label = "wps";
+			gpios = <&pinctrl 24 1>;
+			linux,code = <KEY_WPS_BUTTON>;
+			debounce-interval = <60>;
+		};
+	};
+};
+
+&hsspi {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		spi-max-frequency = <16666667>;
+		spi-tx-bus-width = <2>;
+		spi-rx-bus-width = <2>;
+		reg = <0>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			cfe@0 {
+				reg = <0x000000 0x010000>;
+				label = "cfe";
+				read-only;
+			};
+
+			linux@10000 {
+				reg = <0x010000 0x7e0000>;
+				label = "linux";
+				compatible = "brcm,bcm963xx-imagetag";
+			};
+
+			nvram@7f0000 {
+				reg = <0x7f0000 0x010000>;
+				label = "nvram";
+			};
+		};
+	};
+};
+
+&leds {
+	status = "okay";
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_leds>;
+
+	led@1 {
+		reg = <1>;
+		active-low;
+		label = "green:inet";
+	};
+
+	led_power_green: led@4 {
+		reg = <4>;
+		active-low;
+		label = "green:power";
+		default-state = "on";
+	};
+
+	led@7 {
+		reg = <7>;
+		active-low;
+		label = "red:inet";
+	};
+
+	led@8 {
+		reg = <8>;
+		active-low;
+		label = "red:power";
+	};
+
+	led@9 {
+		reg = <9>;
+		active-low;
+		label = "green:wps";
+	};
+
+	led@10 {
+		reg = <10>;
+		active-low;
+		label = "green:usb";
+	};
+
+	led@11 {
+		reg = <11>;
+		active-low;
+		label = "green:dsl";
+	};
+};
+
+&pinctrl {
+	pinctrl_leds: leds {
+		function = "led";
+		pins = "gpio1", "gpio4", "gpio7",
+		       "gpio8", "gpio9", "gpio10",
+		       "gpio11";
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
diff --git a/target/linux/bcm63xx/image/bcm63xx.mk b/target/linux/bcm63xx/image/bcm63xx.mk
index 15cc549ec4a..d3356040d01 100644
--- a/target/linux/bcm63xx/image/bcm63xx.mk
+++ b/target/linux/bcm63xx/image/bcm63xx.mk
@@ -571,6 +571,19 @@ define Device/d-link_dsl-274xb-f1
 endef
 TARGET_DEVICES += d-link_dsl-274xb-f1
 
+define Device/d-link_dsl-2750u-c1
+  $(Device/bcm63xx)
+  DEVICE_VENDOR := D-Link
+  DEVICE_MODEL := DSL-2750U
+  DEVICE_VARIANT := C1
+  IMAGES += sysupgrade.bin
+  CFE_BOARD_ID := 963281TAVNG
+  CHIP_ID := 6328
+  FLASH_MB := 8
+  DEVICE_PACKAGES := $(USB2_PACKAGES) $(B43_PACKAGES)
+endef
+TARGET_DEVICES += d-link_dsl-2750u-c1
+
 define Device/d-link_dsl-275xb-d1
   $(Device/bcm63xx)
   DEVICE_VENDOR := D-Link
diff --git a/target/linux/bcm63xx/patches-5.4/512-board_bcm6328.patch b/target/linux/bcm63xx/patches-5.4/512-board_bcm6328.patch
index abab912092d..5a2dbdcf85b 100644
--- a/target/linux/bcm63xx/patches-5.4/512-board_bcm6328.patch
+++ b/target/linux/bcm63xx/patches-5.4/512-board_bcm6328.patch
@@ -500,7 +500,7 @@
  #endif /* CONFIG_BCM63XX_CPU_6328 */
  #ifdef CONFIG_BCM63XX_CPU_6338
  	&board_96338gw,
-@@ -742,7 +1228,18 @@ static struct of_device_id const bcm963x
+@@ -742,7 +1228,19 @@ static struct of_device_id const bcm963x
  	{ .compatible = "sagem,fast-2704n", .data = &board_FAST2704N, },
  #endif /* CONFIG_BCM63XX_CPU_6318 */
  #ifdef CONFIG_BCM63XX_CPU_6328
@@ -512,6 +512,7 @@
 +	{ .compatible = "comtrend,ar-5381u", .data = &board_AR5381u, },
 +	{ .compatible = "comtrend,ar-5387un", .data = &board_AR5387un, },
 +	{ .compatible = "d-link,dsl-274xb-f1", .data = &board_dsl_274xb_f1, },
++	{ .compatible = "d-link,dsl-2750u-c1", .data = &board_A4001N, },
 +	{ .compatible = "nucom,r5010un-v2", .data = &board_R5010UNV2, },
 +	{ .compatible = "sagem,fast-2704-v2", .data = &board_FAST2704V2, },
 +	{ .compatible = "sercomm,ad1018", .data = &board_AD1018, },
diff --git a/target/linux/bcm63xx/patches-5.4/513-board-bcm6338.patch b/target/linux/bcm63xx/patches-5.4/513-board-bcm6338.patch
index 85c8e6c3909..8ff2a69707b 100644
--- a/target/linux/bcm63xx/patches-5.4/513-board-bcm6338.patch
+++ b/target/linux/bcm63xx/patches-5.4/513-board-bcm6338.patch
@@ -42,7 +42,7 @@
  #endif /* CONFIG_BCM63XX_CPU_6338 */
  #ifdef CONFIG_BCM63XX_CPU_6345
  	&board_96345gw2,
-@@ -1244,6 +1272,8 @@ static struct of_device_id const bcm963x
+@@ -1245,6 +1273,8 @@ static struct of_device_id const bcm963x
  #ifdef CONFIG_BCM63XX_CPU_6338
  	{ .compatible = "brcm,bcm96338gw", .data = &board_96338gw, },
  	{ .compatible = "brcm,bcm96338w", .data = &board_96338w, },
diff --git a/target/linux/bcm63xx/patches-5.4/514-board_bcm6345.patch b/target/linux/bcm63xx/patches-5.4/514-board_bcm6345.patch
index d881555853b..ca200024c2d 100644
--- a/target/linux/bcm63xx/patches-5.4/514-board_bcm6345.patch
+++ b/target/linux/bcm63xx/patches-5.4/514-board_bcm6345.patch
@@ -28,7 +28,7 @@
  #endif /* CONFIG_BCM63XX_CPU_6345 */
  #ifdef CONFIG_BCM63XX_CPU_6348
  	&board_96348r,
-@@ -1277,6 +1291,8 @@ static struct of_device_id const bcm963x
+@@ -1278,6 +1292,8 @@ static struct of_device_id const bcm963x
  #endif /* CONFIG_BCM63XX_CPU_6338 */
  #ifdef CONFIG_BCM63XX_CPU_6345
  	{ .compatible = "brcm,bcm96345gw2", .data = &board_96345gw2, },
diff --git a/target/linux/bcm63xx/patches-5.4/515-board-bcm6348.patch b/target/linux/bcm63xx/patches-5.4/515-board-bcm6348.patch
index 1e93c5e4435..eab83113f76 100644
--- a/target/linux/bcm63xx/patches-5.4/515-board-bcm6348.patch
+++ b/target/linux/bcm63xx/patches-5.4/515-board-bcm6348.patch
@@ -296,7 +296,7 @@
  #endif /* CONFIG_BCM63XX_CPU_6348 */
  #ifdef CONFIG_BCM63XX_CPU_6358
  	&board_96358vw,
-@@ -1295,15 +1577,29 @@ static struct of_device_id const bcm963x
+@@ -1296,15 +1578,29 @@ static struct of_device_id const bcm963x
  	{ .compatible = "dynalink,rta770w", .data = &board_rta770w, },
  #endif /* CONFIG_BCM63XX_CPU_6345 */
  #ifdef CONFIG_BCM63XX_CPU_6348
diff --git a/target/linux/bcm63xx/patches-5.4/516-board-bcm6358.patch b/target/linux/bcm63xx/patches-5.4/516-board-bcm6358.patch
index 18f813b9b85..4279b0bb133 100644
--- a/target/linux/bcm63xx/patches-5.4/516-board-bcm6358.patch
+++ b/target/linux/bcm63xx/patches-5.4/516-board-bcm6358.patch
@@ -357,7 +357,7 @@
  #endif /* CONFIG_BCM63XX_CPU_6358 */
  };
  
-@@ -1607,11 +1935,24 @@ static struct of_device_id const bcm963x
+@@ -1608,11 +1936,24 @@ static struct of_device_id const bcm963x
  	{ .compatible = "alcatel,rg100a", .data = &board_96358vw2, },
  	{ .compatible = "brcm,bcm96358vw", .data = &board_96358vw, },
  	{ .compatible = "brcm,bcm96358vw2", .data = &board_96358vw2, },
diff --git a/target/linux/bcm63xx/patches-5.4/517-board_bcm6362.patch b/target/linux/bcm63xx/patches-5.4/517-board_bcm6362.patch
index 8e87c0cc55a..ac9d76a52f5 100644
--- a/target/linux/bcm63xx/patches-5.4/517-board_bcm6362.patch
+++ b/target/linux/bcm63xx/patches-5.4/517-board_bcm6362.patch
@@ -131,7 +131,7 @@
  };
  
  static struct of_device_id const bcm963xx_boards_dt[] = {
-@@ -1955,6 +2072,10 @@ static struct of_device_id const bcm963x
+@@ -1956,6 +2073,10 @@ static struct of_device_id const bcm963x
  	{ .compatible = "telsey,cpva642", .data = &board_CPVA642, },
  #endif /* CONFIG_BCM63XX_CPU_6358 */
  #ifdef CONFIG_BCM63XX_CPU_6362
diff --git a/target/linux/bcm63xx/patches-5.4/518-board_bcm6368.patch b/target/linux/bcm63xx/patches-5.4/518-board_bcm6368.patch
index e745bf08488..1ba6d5ecd8b 100644
--- a/target/linux/bcm63xx/patches-5.4/518-board_bcm6368.patch
+++ b/target/linux/bcm63xx/patches-5.4/518-board_bcm6368.patch
@@ -681,7 +681,7 @@
  };
  
  static struct of_device_id const bcm963xx_boards_dt[] = {
-@@ -2078,6 +2738,20 @@ static struct of_device_id const bcm963x
+@@ -2079,6 +2739,20 @@ static struct of_device_id const bcm963x
  	{ .compatible = "sfr,neufbox-6-sercomm-r0", .data = &board_nb6, },
  #endif /* CONFIG_BCM63XX_CPU_6362 */
  #ifdef CONFIG_BCM63XX_CPU_6368
diff --git a/target/linux/bcm63xx/patches-5.4/519-board_bcm63268.patch b/target/linux/bcm63xx/patches-5.4/519-board_bcm63268.patch
index 2718bbdd365..139f6ad0853 100644
--- a/target/linux/bcm63xx/patches-5.4/519-board_bcm63268.patch
+++ b/target/linux/bcm63xx/patches-5.4/519-board_bcm63268.patch
@@ -290,7 +290,7 @@
  };
  
  static struct of_device_id const bcm963xx_boards_dt[] = {
-@@ -2754,6 +3030,14 @@ static struct of_device_id const bcm963x
+@@ -2755,6 +3031,14 @@ static struct of_device_id const bcm963x
  	{ .compatible = "zyxel,p870hw-51a-v2", .data = &board_P870HW51A_V2, },
  #endif /* CONFIG_BCM63XX_CPU_6368 */
  #ifdef CONFIG_BCM63XX_CPU_63268
diff --git a/target/linux/bcm63xx/patches-5.4/531-board_bcm6348-bt-voyager-2500v-bb.patch b/target/linux/bcm63xx/patches-5.4/531-board_bcm6348-bt-voyager-2500v-bb.patch
index 750deb6da01..9264becf3e7 100644
--- a/target/linux/bcm63xx/patches-5.4/531-board_bcm6348-bt-voyager-2500v-bb.patch
+++ b/target/linux/bcm63xx/patches-5.4/531-board_bcm6348-bt-voyager-2500v-bb.patch
@@ -1,6 +1,6 @@
 --- a/arch/mips/bcm63xx/boards/board_bcm963xx.c
 +++ b/arch/mips/bcm63xx/boards/board_bcm963xx.c
-@@ -3066,6 +3066,22 @@ void __init board_bcm963xx_init(void)
+@@ -3067,6 +3067,22 @@ void __init board_bcm963xx_init(void)
  		val &= MPI_CSBASE_BASE_MASK;
  	}
  	boot_addr = (u8 *)KSEG1ADDR(val);