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 cfd4cf3c31..bdd6934023 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 f02eabe68f..711b8f8c00 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 0000000000..0915215039
--- /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 15cc549ec4..d3356040d0 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 abab912092..5a2dbdcf85 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 85c8e6c390..8ff2a69707 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 d881555853..ca200024c2 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 1e93c5e443..eab83113f7 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 18f813b9b8..4279b0bb13 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 8e87c0cc55..ac9d76a52f 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 e745bf0848..1ba6d5ecd8 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 2718bbdd36..139f6ad085 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 750deb6da0..9264becf3e 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);