bcm53xx: add testing support for kernel 5.10

It still requires fixing PCIe support:
[    6.644699] pcie_iproc_bcma bcma0:7: host bridge /axi@18000000/pcie@12000 ranges:
[    6.652217] pcie_iproc_bcma bcma0:7:   No bus range found for /axi@18000000/pcie@12000, using [bus 00-ff]
[    6.661833] OF: /axi@18000000/pcie@12000: Missing device_type
[    6.667622] pcie_iproc_bcma: probe of bcma0:7 failed with error -12
[    6.673985] pcie_iproc_bcma bcma0:8: host bridge /axi@18000000/pcie@13000 ranges:
[    6.681514] pcie_iproc_bcma bcma0:8:   No bus range found for /axi@18000000/pcie@13000, using [bus 00-ff]
[    6.691137] pcie_iproc_bcma: probe of bcma0:8 failed with error -12
[    6.697522] pcie_iproc_bcma bcma0:9: host bridge /axi@18000000/pcie@14000 ranges:
[    6.705048] pcie_iproc_bcma bcma0:9:   No bus range found for /axi@18000000/pcie@14000, using [bus 00-ff]
[    6.714669] pcie_iproc_bcma: probe of bcma0:9 failed with error -12

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 82 insertions, 0 deletions

diff --git a/target/linux/bcm53xx/patches-5.10/030-v5.11-0011-ARM-dts-BCM5301X-Add-a-default-compatible-for-switch.patch b/target/linux/bcm53xx/patches-5.10/030-v5.11-0011-ARM-dts-BCM5301X-Add-a-default-compatible-for-switch.patch
new file mode 100644
index 0000000000..bb1ca592a6
--- /dev/null
+++ b/target/linux/bcm53xx/patches-5.10/030-v5.11-0011-ARM-dts-BCM5301X-Add-a-default-compatible-for-switch.patch
@@ -0,0 +1,82 @@
+From 953efcb0c0234f8c488ebd4090378e949d6ba78b Mon Sep 17 00:00:00 2001
+From: Florian Fainelli <f.fainelli@gmail.com>
+Date: Mon, 9 Nov 2020 16:42:09 -0800
+Subject: [PATCH] ARM: dts: BCM5301X: Add a default compatible for switch node
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Provide a default compatible string which is based on the 53011 SRAB
+compatible by default. The 4709 and 47094 default to the 53012 SRAB
+compatible.
+
+This allows us to have sane defaults and silences the following
+warnings:
+
+arch/arm/boot/dts/bcm4708-asus-rt-ac56u.dt.yaml:
+ethernet-switch@18007000: compatible: 'oneOf' conditional failed, one
+must be fixed:
+        ['brcm,bcm5301x-srab'] is too short
+        'brcm,bcm5325' was expected
+        'brcm,bcm53115' was expected
+        'brcm,bcm53125' was expected
+        'brcm,bcm53128' was expected
+        'brcm,bcm5365' was expected
+        'brcm,bcm5395' was expected
+        'brcm,bcm5389' was expected
+        'brcm,bcm5397' was expected
+        'brcm,bcm5398' was expected
+        'brcm,bcm11360-srab' was expected
+        'brcm,bcm5301x-srab' is not one of ['brcm,bcm53010-srab',
+'brcm,bcm53011-srab', 'brcm,bcm53012-srab', 'brcm,bcm53018-srab',
+'brcm,bcm53019-srab']
+        'brcm,bcm5301x-srab' is not one of ['brcm,bcm11404-srab',
+'brcm,bcm11407-srab', 'brcm,bcm11409-srab', 'brcm,bcm58310-srab',
+'brcm,bcm58311-srab', 'brcm,bcm58313-srab']
+        'brcm,bcm5301x-srab' is not one of ['brcm,bcm58522-srab',
+'brcm,bcm58523-srab', 'brcm,bcm58525-srab', 'brcm,bcm58622-srab',
+'brcm,bcm58623-srab', 'brcm,bcm58625-srab', 'brcm,bcm88312-srab']
+        'brcm,bcm5301x-srab' is not one of ['brcm,bcm3384-switch',
+'brcm,bcm6328-switch', 'brcm,bcm6368-switch']
+        From schema:
+Documentation/devicetree/bindings/net/dsa/b53.yaml
+
+Acked-by: Rafał Miłecki <rafal@milecki.pl>
+Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
+---
+ arch/arm/boot/dts/bcm4709.dtsi  | 4 ++++
+ arch/arm/boot/dts/bcm47094.dtsi | 4 ++++
+ arch/arm/boot/dts/bcm5301x.dtsi | 2 +-
+ 3 files changed, 9 insertions(+), 1 deletion(-)
+
+--- a/arch/arm/boot/dts/bcm4709.dtsi
++++ b/arch/arm/boot/dts/bcm4709.dtsi
+@@ -9,3 +9,7 @@
+ 	clock-frequency = <125000000>;
+ 	status = "okay";
+ };
++
++&srab {
++	compatible = "brcm,bcm53012-srab", "brcm,bcm5301x-srab";
++};
+--- a/arch/arm/boot/dts/bcm47094.dtsi
++++ b/arch/arm/boot/dts/bcm47094.dtsi
+@@ -25,3 +25,7 @@
+ 	clock-frequency = <125000000>;
+ 	status = "okay";
+ };
++
++&srab {
++	compatible = "brcm,bcm53012-srab", "brcm,bcm5301x-srab";
++};
+--- a/arch/arm/boot/dts/bcm5301x.dtsi
++++ b/arch/arm/boot/dts/bcm5301x.dtsi
+@@ -483,7 +483,7 @@
+ 	};
+ 
+ 	srab: ethernet-switch@18007000 {
+-		compatible = "brcm,bcm5301x-srab";
++		compatible = "brcm,bcm53011-srab", "brcm,bcm5301x-srab";
+ 		reg = <0x18007000 0x1000>;
+ 
+ 		status = "disabled";