phy: add support for bcm6348 usbh phy

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

drivers/phy/Kconfig

@@ -59,6 +59,12 @@ config SPL_NOP_PHY
 	  This is useful when a driver uses the PHY framework but no real PHY
 	  hardware exists.
 
+config BCM6348_USBH_PHY
+	bool "BCM6348 USBH PHY support"
+	depends on PHY && ARCH_BMIPS
+	help
+	  Support for the Broadcom MIPS BCM6348 USBH PHY.
+
 config PIPE3_PHY
 	bool "Support omap's PIPE3 PHY"
 	depends on PHY && ARCH_OMAP2PLUS

drivers/phy/Makefile

@@ -7,6 +7,7 @@
 
 obj-$(CONFIG_$(SPL_)PHY) += phy-uclass.o
 obj-$(CONFIG_$(SPL_)NOP_PHY) += nop-phy.o
+obj-$(CONFIG_BCM6348_USBH_PHY) += bcm6348-usbh-phy.o
 obj-$(CONFIG_PHY_SANDBOX) += sandbox-phy.o
 obj-$(CONFIG_$(SPL_)PIPE3_PHY) += ti-pipe3-phy.o
 obj-$(CONFIG_STI_USB_PHY) += sti_usb_phy.o

drivers/phy/bcm6348-usbh-phy.c

@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2018 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * Derived from linux/arch/mips/bcm63xx/usb-common.c:
+ *	Copyright 2008 Maxime Bizon <mbizon@freebox.fr>
+ *	Copyright 2013 Florian Fainelli <florian@openwrt.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <generic-phy.h>
+#include <reset.h>
+#include <asm/io.h>
+#include <dm/device.h>
+
+#define USBH_SETUP_PORT1_EN	BIT(0)
+
+struct bcm6348_usbh_priv {
+	void __iomem *regs;
+};
+
+static int bcm6348_usbh_init(struct phy *phy)
+{
+	struct bcm6348_usbh_priv *priv = dev_get_priv(phy->dev);
+
+	writel_be(USBH_SETUP_PORT1_EN, priv->regs);
+
+	return 0;
+}
+
+static struct phy_ops bcm6348_usbh_ops = {
+	.init = bcm6348_usbh_init,
+};
+
+static const struct udevice_id bcm6348_usbh_ids[] = {
+	{ .compatible = "brcm,bcm6348-usbh" },
+	{ /* sentinel */ }
+};
+
+static int bcm6348_usbh_probe(struct udevice *dev)
+{
+	struct bcm6348_usbh_priv *priv = dev_get_priv(dev);
+	struct reset_ctl rst_ctl;
+	struct clk clk;
+	fdt_addr_t addr;
+	fdt_size_t size;
+	int ret;
+
+	addr = devfdt_get_addr_size_index(dev, 0, &size);
+	if (addr == FDT_ADDR_T_NONE)
+		return -EINVAL;
+
+	priv->regs = ioremap(addr, size);
+
+	/* enable usbh clock */
+	ret = clk_get_by_name(dev, "usbh", &clk);
+	if (ret < 0)
+		return ret;
+
+	ret = clk_enable(&clk);
+	if (ret < 0)
+		return ret;
+
+	ret = clk_free(&clk);
+	if (ret < 0)
+		return ret;
+
+	/* perform reset */
+	ret = reset_get_by_index(dev, 0, &rst_ctl);
+	if (ret < 0)
+		return ret;
+
+	ret = reset_deassert(&rst_ctl);
+	if (ret < 0)
+		return ret;
+
+	ret = reset_free(&rst_ctl);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+U_BOOT_DRIVER(bcm6348_usbh) = {
+	.name = "bcm6348-usbh",
+	.id = UCLASS_PHY,
+	.of_match = bcm6348_usbh_ids,
+	.ops = &bcm6348_usbh_ops,
+	.priv_auto_alloc_size = sizeof(struct bcm6348_usbh_priv),
+	.probe = bcm6348_usbh_probe,
+};