2 * Copyright (C) 2014 STMicroelectronics
4 * STMicroelectronics PHY driver for STiH41x USB.
6 * Author: Maxime Coquelin <maxime.coquelin@st.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2, as
10 * published by the Free Software Foundation.
14 #include <linux/platform_device.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
19 #include <linux/of_platform.h>
20 #include <linux/clk.h>
21 #include <linux/phy/phy.h>
22 #include <linux/regmap.h>
23 #include <linux/mfd/syscon.h>
25 #define SYSCFG332 0x80
26 #define SYSCFG2520 0x820
29 * struct stih41x_usb_cfg - SoC specific PHY register mapping
30 * @syscfg: Offset in syscfg registers bank
31 * @cfg_mask: Bits mask for PHY configuration
32 * @cfg: Static configuration value for PHY
33 * @oscok: Notify the PHY oscillator clock is ready
34 * Setting this bit enable the PHY
36 struct stih41x_usb_cfg {
44 * struct stih41x_usb_phy - Private data for the PHY
45 * @dev: device for this controller
46 * @regmap: Syscfg registers bank in which PHY is configured
47 * @cfg: SoC specific PHY register mapping
48 * @clk: Oscillator used by the PHY
50 struct stih41x_usb_phy {
52 struct regmap *regmap;
53 const struct stih41x_usb_cfg *cfg;
57 static struct stih41x_usb_cfg stih415_usb_phy_cfg = {
64 static struct stih41x_usb_cfg stih416_usb_phy_cfg = {
71 static int stih41x_usb_phy_init(struct phy *phy)
73 struct stih41x_usb_phy *phy_dev = phy_get_drvdata(phy);
75 return regmap_update_bits(phy_dev->regmap, phy_dev->cfg->syscfg,
76 phy_dev->cfg->cfg_mask, phy_dev->cfg->cfg);
79 static int stih41x_usb_phy_power_on(struct phy *phy)
81 struct stih41x_usb_phy *phy_dev = phy_get_drvdata(phy);
84 ret = clk_prepare_enable(phy_dev->clk);
86 dev_err(phy_dev->dev, "Failed to enable osc_phy clock\n");
90 return regmap_update_bits(phy_dev->regmap, phy_dev->cfg->syscfg,
91 phy_dev->cfg->oscok, phy_dev->cfg->oscok);
94 static int stih41x_usb_phy_power_off(struct phy *phy)
96 struct stih41x_usb_phy *phy_dev = phy_get_drvdata(phy);
99 ret = regmap_update_bits(phy_dev->regmap, phy_dev->cfg->syscfg,
100 phy_dev->cfg->oscok, 0);
102 dev_err(phy_dev->dev, "Failed to clear oscok bit\n");
106 clk_disable_unprepare(phy_dev->clk);
111 static struct phy_ops stih41x_usb_phy_ops = {
112 .init = stih41x_usb_phy_init,
113 .power_on = stih41x_usb_phy_power_on,
114 .power_off = stih41x_usb_phy_power_off,
115 .owner = THIS_MODULE,
118 static const struct of_device_id stih41x_usb_phy_of_match[];
120 static int stih41x_usb_phy_probe(struct platform_device *pdev)
122 struct device_node *np = pdev->dev.of_node;
123 const struct of_device_id *match;
124 struct stih41x_usb_phy *phy_dev;
125 struct device *dev = &pdev->dev;
126 struct phy_provider *phy_provider;
129 phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL);
133 match = of_match_device(stih41x_usb_phy_of_match, &pdev->dev);
137 phy_dev->cfg = match->data;
139 phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
140 if (IS_ERR(phy_dev->regmap)) {
141 dev_err(dev, "No syscfg phandle specified\n");
142 return PTR_ERR(phy_dev->regmap);
145 phy_dev->clk = devm_clk_get(dev, "osc_phy");
146 if (IS_ERR(phy_dev->clk)) {
147 dev_err(dev, "osc_phy clk not found\n");
148 return PTR_ERR(phy_dev->clk);
151 phy = devm_phy_create(dev, NULL, &stih41x_usb_phy_ops);
154 dev_err(dev, "failed to create phy\n");
160 phy_set_drvdata(phy, phy_dev);
162 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
163 if (IS_ERR(phy_provider))
164 return PTR_ERR(phy_provider);
169 static const struct of_device_id stih41x_usb_phy_of_match[] = {
170 { .compatible = "st,stih415-usb-phy", .data = &stih415_usb_phy_cfg },
171 { .compatible = "st,stih416-usb-phy", .data = &stih416_usb_phy_cfg },
174 MODULE_DEVICE_TABLE(of, stih41x_usb_phy_of_match);
176 static struct platform_driver stih41x_usb_phy_driver = {
177 .probe = stih41x_usb_phy_probe,
179 .name = "stih41x-usb-phy",
180 .of_match_table = stih41x_usb_phy_of_match,
183 module_platform_driver(stih41x_usb_phy_driver);
185 MODULE_AUTHOR("Maxime Coquelin <maxime.coquelin@st.com>");
186 MODULE_DESCRIPTION("STMicroelectronics USB PHY driver for STiH41x series");
187 MODULE_LICENSE("GPL v2");