Revert "phy: Add USB3 PHY support for Broadcom NSP SoC"

This reverts commit d7bc1a7d41bf ("phy: Add USB3 PHY support for
Broadcom NSP SoC") as we already have driver for this PHY (shared by NS
and NSP). It was added in commit e5666281d9ea ("phy: bcm-ns-usb3: new
driver for USB 3.0 PHY on Northstar").

Instead of adding separated driver & duplicating code we should work on
improving existing (old) one. Thanks to work done by Broadcom we know
there is MDIO bus we weren't aware of & we know register names which
makes initialization more clear. This is very valuable info and we
should work on using it in existing driver afterwards.

Acked-by: Jon Mason <jon.mason@broadcom.com>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

drivers/phy/Kconfig

@@ -510,12 +510,4 @@ config PHY_MESON8B_USB2
 	  and GXBB SoCs.
 	  If unsure, say N.
 
-config PHY_NSP_USB3
-	tristate "Broadcom NorthStar plus USB3 PHY driver"
-	depends on OF && (ARCH_BCM_NSP || COMPILE_TEST)
-	select GENERIC_PHY
-	default ARCH_BCM_NSP
-	help
-	  Enable this to support the Broadcom Northstar plus USB3 PHY.
-	  If unsure, say N.
 endmenu

drivers/phy/Makefile

@@ -62,4 +62,3 @@ obj-$(CONFIG_PHY_CYGNUS_PCIE)		+= phy-bcm-cygnus-pcie.o
 obj-$(CONFIG_ARCH_TEGRA) += tegra/
 obj-$(CONFIG_PHY_NS2_PCIE)		+= phy-bcm-ns2-pcie.o
 obj-$(CONFIG_PHY_MESON8B_USB2)		+= phy-meson8b-usb2.o
-obj-$(CONFIG_PHY_NSP_USB3)		+= phy-bcm-nsp-usb3.o

drivers/phy/phy-bcm-nsp-usb3.c

@@ -1,177 +0,0 @@
-/*
- * Copyright (C) 2016 Broadcom
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any
- * kind, whether express or implied; without even the implied warranty
- * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <linux/delay.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/mfd/syscon.h>
-#include <linux/mdio.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/phy/phy.h>
-#include <linux/regmap.h>
-
-#define NSP_USB3_RST_CTRL_OFFSET	0x3f8
-
-/* mdio reg access */
-#define NSP_USB3_PHY_BASE_ADDR_REG	0x1f
-
-#define NSP_USB3_PHY_PLL30_BLOCK	0x8000
-#define NSP_USB3_PLL_CONTROL		0x01
-#define NSP_USB3_PLLA_CONTROL0		0x0a
-#define NSP_USB3_PLLA_CONTROL1		0x0b
-
-#define NSP_USB3_PHY_TX_PMD_BLOCK	0x8040
-#define NSP_USB3_TX_PMD_CONTROL1	0x01
-
-#define NSP_USB3_PHY_PIPE_BLOCK		0x8060
-#define NSP_USB3_LFPS_CMP		0x02
-#define NSP_USB3_LFPS_DEGLITCH		0x03
-
-struct nsp_usb3_phy {
-	struct regmap *usb3_ctrl;
-	struct phy *phy;
-	struct mdio_device *mdiodev;
-};
-
-static int nsp_usb3_phy_init(struct phy *phy)
-{
-	struct nsp_usb3_phy *iphy = phy_get_drvdata(phy);
-	struct mii_bus *bus = iphy->mdiodev->bus;
-	int addr = iphy->mdiodev->addr;
-	u32 data;
-	int rc;
-
-	rc = regmap_read(iphy->usb3_ctrl, 0, &data);
-	if (rc)
-		return rc;
-	data |= 1;
-	rc = regmap_write(iphy->usb3_ctrl, 0, data);
-	if (rc)
-		return rc;
-
-	rc = regmap_write(iphy->usb3_ctrl, NSP_USB3_RST_CTRL_OFFSET, 1);
-	if (rc)
-		return rc;
-
-	rc = mdiobus_write(bus, addr, NSP_USB3_PHY_BASE_ADDR_REG,
-			   NSP_USB3_PHY_PLL30_BLOCK);
-	if (rc)
-		return rc;
-
-	rc = mdiobus_write(bus, addr, NSP_USB3_PLL_CONTROL, 0x1000);
-	if (rc)
-		return rc;
-
-	rc = mdiobus_write(bus, addr, NSP_USB3_PLLA_CONTROL0, 0x6400);
-	if (rc)
-		return rc;
-
-	rc = mdiobus_write(bus, addr, NSP_USB3_PLLA_CONTROL1, 0xc000);
-	if (rc)
-		return rc;
-
-	rc = mdiobus_write(bus, addr, NSP_USB3_PLLA_CONTROL1, 0x8000);
-	if (rc)
-		return rc;
-
-	rc = regmap_write(iphy->usb3_ctrl, NSP_USB3_RST_CTRL_OFFSET, 0);
-	if (rc)
-		return rc;
-
-	rc = mdiobus_write(bus, addr, NSP_USB3_PLL_CONTROL, 0x9000);
-	if (rc)
-		return rc;
-
-	rc = mdiobus_write(bus, addr, NSP_USB3_PHY_BASE_ADDR_REG,
-			   NSP_USB3_PHY_PIPE_BLOCK);
-	if (rc)
-		return rc;
-
-	rc = mdiobus_write(bus, addr, NSP_USB3_LFPS_CMP, 0xf30d);
-	if (rc)
-		return rc;
-
-	rc = mdiobus_write(bus, addr, NSP_USB3_LFPS_DEGLITCH, 0x6302);
-	if (rc)
-		return rc;
-
-	rc = mdiobus_write(bus, addr, NSP_USB3_PHY_BASE_ADDR_REG,
-			   NSP_USB3_PHY_TX_PMD_BLOCK);
-	if (rc)
-		return rc;
-
-	rc = mdiobus_write(bus, addr, NSP_USB3_TX_PMD_CONTROL1, 0x1003);
-
-	return rc;
-}
-
-static struct phy_ops nsp_usb3_phy_ops = {
-	.init	= nsp_usb3_phy_init,
-	.owner	= THIS_MODULE,
-};
-
-static int nsp_usb3_phy_probe(struct mdio_device *mdiodev)
-{
-	struct device *dev = &mdiodev->dev;
-	struct phy_provider *provider;
-	struct nsp_usb3_phy *iphy;
-
-	iphy = devm_kzalloc(dev, sizeof(*iphy), GFP_KERNEL);
-	if (!iphy)
-		return -ENOMEM;
-	iphy->mdiodev = mdiodev;
-
-	iphy->usb3_ctrl = syscon_regmap_lookup_by_phandle(dev->of_node,
-						 "usb3-ctrl-syscon");
-	if (IS_ERR(iphy->usb3_ctrl))
-		return PTR_ERR(iphy->usb3_ctrl);
-
-	iphy->phy = devm_phy_create(dev, dev->of_node, &nsp_usb3_phy_ops);
-	if (IS_ERR(iphy->phy)) {
-		dev_err(dev, "failed to create PHY\n");
-		return PTR_ERR(iphy->phy);
-	}
-
-	phy_set_drvdata(iphy->phy, iphy);
-
-	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
-	if (IS_ERR(provider)) {
-		dev_err(dev, "could not register PHY provider\n");
-		return PTR_ERR(provider);
-	}
-
-	return 0;
-}
-
-static const struct of_device_id nsp_usb3_phy_of_match[] = {
-	{.compatible = "brcm,nsp-usb3-phy",},
-	{ /* sentinel */ }
-};
-
-static struct mdio_driver nsp_usb3_phy_driver = {
-	.mdiodrv = {
-		.driver = {
-			.name = "nsp-usb3-phy",
-			.of_match_table = nsp_usb3_phy_of_match,
-		},
-	},
-	.probe = nsp_usb3_phy_probe,
-};
-
-mdio_module_driver(nsp_usb3_phy_driver);
-
-MODULE_DESCRIPTION("Broadcom NSP USB3 PHY driver");
-MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com");