From b5f71652b85a85ea53162e9e2b760b84fd0d254f Mon Sep 17 00:00:00 2001
From: Robert Marko <robert.marko@sartura.hr>
Date: Mon, 1 Nov 2021 18:10:28 +0100
Subject: [PATCH] net: dsa: add Qualcomm IPQ4019 built-in switch support

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.

Signed-off-by: Robert Marko <robert.marko@sartura.hr>
---
 drivers/net/dsa/qca/Kconfig  | 9 +++++++++
 drivers/net/dsa/qca/Makefile | 1 +
 2 files changed, 10 insertions(+)

--- a/drivers/net/dsa/qca/Kconfig
+++ b/drivers/net/dsa/qca/Kconfig
@@ -7,3 +7,12 @@ config NET_DSA_AR9331
 	help
 	  This enables support for the Qualcomm Atheros AR9331 built-in Ethernet
 	  switch.
+
+config NET_DSA_QCA8K_IPQ4019
+	tristate "Qualcomm Atheros IPQ4019 built-in Ethernet switch support"
+	depends on HAS_IOMEM && NET_DSA
+	select NET_DSA_TAG_IPQ4019
+	select REGMAP
+	help
+	  This enables support for the Qualcomm Atheros IPQ4019 SoC built-in
+	  Ethernet switch.
--- a/drivers/net/dsa/qca/Makefile
+++ b/drivers/net/dsa/qca/Makefile
@@ -1,2 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-$(CONFIG_NET_DSA_AR9331)	+= ar9331.o
+obj-$(CONFIG_NET_DSA_QCA8K_IPQ4019)	+= qca8k-ipq4019.o
