ipq40xx: add DSA switch driver

Qualcomm IPQ40xx SoC-s have a variant of QCA8337N switch built-in.

It shares most of the stuff with its external counterpart, however it is
modified for the SoC.
Namely, it doesn't have second CPU port (Port 6), so it has 6 ports
instead of 7.
It also has no built-in PHY-s but rather requires external PSGMII based
companion PHY-s (QCA8072 and QCA8075) for which it first needs to carry
out calibration before using them.
PSGMII has a SoC built-in PHY that is used to connect to the PHY-s which
unfortunately requires some magic values as the datasheet doesnt document
the bits that are being set or the register at all.

Since its built-in it is MMIO like other peripherals and doesn't have its
own MDIO bus but depends on the SoC provided one.

CPU connection is at Port 0 and it uses some kind of a internal connection
and no traditional RGMII/SGMII.
It also doesn't use in-band tagging like other qca8k switches so a shinfo
based tagger is used.

This is based on the current OpenWrt qca8k version that has been imported
from generic target.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>

1 files changed, 98 insertions, 0 deletions

diff --git a/target/linux/ipq40xx/patches-5.15/706-arm-dts-ipq4019-add-switch-node.patch b/target/linux/ipq40xx/patches-5.15/706-arm-dts-ipq4019-add-switch-node.patch
new file mode 100644
index 0000000000..a231c7331b
--- /dev/null
+++ b/target/linux/ipq40xx/patches-5.15/706-arm-dts-ipq4019-add-switch-node.patch
@@ -0,0 +1,98 @@
+From ebb62523990a27b3a25e422fa575619f7f725a20 Mon Sep 17 00:00:00 2001
+From: Robert Marko <robert.marko@sartura.hr>
+Date: Mon, 1 Nov 2021 18:15:04 +0100
+Subject: [PATCH] arm: dts: ipq4019: add switch node
+
+Since the built-in IPQ40xx switch now has a driver, add the required node
+for it to work.
+
+Signed-off-by: Robert Marko <robert.marko@sartura.hr>
+---
+ arch/arm/boot/dts/qcom-ipq4019.dtsi | 78 +++++++++++++++++++++++++++++
+ 1 file changed, 78 insertions(+)
+
+--- a/arch/arm/boot/dts/qcom-ipq4019.dtsi
++++ b/arch/arm/boot/dts/qcom-ipq4019.dtsi
+@@ -590,6 +590,82 @@
+ 			status = "disabled";
+ 		};
+ 
++		switch: switch@c000000 {
++			compatible = "qca,ipq4019-qca8337n";
++			reg = <0xc000000 0x80000>, <0x98000 0x800>;
++			reg-names = "base", "psgmii_phy";
++			resets = <&gcc ESS_PSGMII_ARES>;
++			reset-names = "psgmii_rst";
++			mdio = <&mdio>;
++			psgmii-ethphy = <&psgmiiphy>;
++
++			status = "disabled";
++
++			ports {
++				#address-cells = <1>;
++				#size-cells = <0>;
++
++				port@0 { /* MAC0 */
++					reg = <0>;
++					label = "cpu";
++					ethernet = <&gmac>;
++					phy-mode = "internal";
++
++					fixed-link {
++						speed = <1000>;
++						full-duplex;
++						pause;
++						asym-pause;
++					};
++				};
++
++				swport1: port@1 { /* MAC1 */
++					reg = <1>;
++					label = "lan1";
++					phy-handle = <&ethphy0>;
++					phy-mode = "psgmii";
++
++					status = "disabled";
++				};
++
++				swport2: port@2 { /* MAC2 */
++					reg = <2>;
++					label = "lan2";
++					phy-handle = <&ethphy1>;
++					phy-mode = "psgmii";
++
++					status = "disabled";
++				};
++
++				swport3: port@3 { /* MAC3 */
++					reg = <3>;
++					label = "lan3";
++					phy-handle = <&ethphy2>;
++					phy-mode = "psgmii";
++
++					status = "disabled";
++				};
++
++				swport4: port@4 { /* MAC4 */
++					reg = <4>;
++					label = "lan4";
++					phy-handle = <&ethphy3>;
++					phy-mode = "psgmii";
++
++					status = "disabled";
++				};
++
++				swport5: port@5 { /* MAC5 */
++					reg = <5>;
++					label = "wan";
++					phy-handle = <&ethphy4>;
++					phy-mode = "psgmii";
++
++					status = "disabled";
++				};
++			};
++		};
++
+ 		gmac: ethernet@c080000 {
+ 			compatible = "qcom,ipq4019-ess-edma";
+ 			reg = <0xc080000 0x8000>;