1 // SPDX-License-Identifier: GPL-2.0-only
3  * Broadcom Northstar USB 2.0 PHY Driver
16 #include <linux/phy/phy.h>
24 	struct phy *phy;  member
29 static int bcm_ns_usb2_phy_init(struct phy *phy)  in bcm_ns_usb2_phy_init()  argument
31 	struct bcm_ns_usb2 *usb2 = phy_get_drvdata(phy);  in bcm_ns_usb2_phy_init()  local
32 	struct device *dev = usb2->dev;  in bcm_ns_usb2_phy_init()
36 	err = clk_prepare_enable(usb2->ref_clk);  in bcm_ns_usb2_phy_init()
42 	ref_clk_rate = clk_get_rate(usb2->ref_clk);  in bcm_ns_usb2_phy_init()
45 		err = -EINVAL;  in bcm_ns_usb2_phy_init()
49 	usb2ctl = readl(usb2->base);  in bcm_ns_usb2_phy_init()
59 	/* Calculate ndiv based on a solid 1920 MHz that is for USB2 PHY */  in bcm_ns_usb2_phy_init()
63 	regmap_write(usb2->clkset, 0, 0x0000ea68);  in bcm_ns_usb2_phy_init()
69 	writel(usb2ctl, usb2->base);  in bcm_ns_usb2_phy_init()
72 	regmap_write(usb2->clkset, 0, 0x00000000);  in bcm_ns_usb2_phy_init()
75 	clk_disable_unprepare(usb2->ref_clk);  in bcm_ns_usb2_phy_init()
87 	struct device *dev = &pdev->dev;  in bcm_ns_usb2_probe()
88 	struct bcm_ns_usb2 *usb2;  in bcm_ns_usb2_probe()  local
91 	usb2 = devm_kzalloc(&pdev->dev, sizeof(*usb2), GFP_KERNEL);  in bcm_ns_usb2_probe()
92 	if (!usb2)  in bcm_ns_usb2_probe()
93 		return -ENOMEM;  in bcm_ns_usb2_probe()
94 	usb2->dev = dev;  in bcm_ns_usb2_probe()
96 	usb2->base = devm_platform_ioremap_resource(pdev, 0);  in bcm_ns_usb2_probe()
97 	if (IS_ERR(usb2->base)) {  in bcm_ns_usb2_probe()
99 		return PTR_ERR(usb2->base);  in bcm_ns_usb2_probe()
102 	usb2->clkset = syscon_regmap_lookup_by_phandle(dev->of_node,  in bcm_ns_usb2_probe()
103 						       "brcm,syscon-clkset");  in bcm_ns_usb2_probe()
104 	if (IS_ERR(usb2->clkset)) {  in bcm_ns_usb2_probe()
106 		return PTR_ERR(usb2->clkset);  in bcm_ns_usb2_probe()
109 	usb2->ref_clk = devm_clk_get(dev, "phy-ref-clk");  in bcm_ns_usb2_probe()
110 	if (IS_ERR(usb2->ref_clk)) {  in bcm_ns_usb2_probe()
111 		dev_err_probe(dev, PTR_ERR(usb2->ref_clk), "failed to get ref clk\n");  in bcm_ns_usb2_probe()
112 		return PTR_ERR(usb2->ref_clk);  in bcm_ns_usb2_probe()
115 	usb2->phy = devm_phy_create(dev, NULL, &ops);  in bcm_ns_usb2_probe()
116 	if (IS_ERR(usb2->phy))  in bcm_ns_usb2_probe()
117 		return PTR_ERR(usb2->phy);  in bcm_ns_usb2_probe()
119 	phy_set_drvdata(usb2->phy, usb2);  in bcm_ns_usb2_probe()
120 	platform_set_drvdata(pdev, usb2);  in bcm_ns_usb2_probe()
127 	{ .compatible = "brcm,ns-usb2-phy", },
141 MODULE_DESCRIPTION("Broadcom Northstar USB 2.0 PHY Driver");