phy-mtk-hdmi.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (c) 2018 MediaTek Inc.
  4 * Author: Jie Qiu <jie.qiu@mediatek.com>
  5 */
  6
  7#include "phy-mtk-hdmi.h"
  8
  9static int mtk_hdmi_phy_power_on(struct phy *phy);
 10static int mtk_hdmi_phy_power_off(struct phy *phy);
 11static int mtk_hdmi_phy_configure(struct phy *phy, union phy_configure_opts *opts);
 12
 13static const struct phy_ops mtk_hdmi_phy_dev_ops = {
 14	.power_on = mtk_hdmi_phy_power_on,
 15	.power_off = mtk_hdmi_phy_power_off,
 16	.configure = mtk_hdmi_phy_configure,
 17	.owner = THIS_MODULE,
 18};
 19
 20inline struct mtk_hdmi_phy *to_mtk_hdmi_phy(struct clk_hw *hw)
 21{
 22	return container_of(hw, struct mtk_hdmi_phy, pll_hw);
 23}
 24
 25static int mtk_hdmi_phy_power_on(struct phy *phy)
 26{
 27	struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);
 28	int ret;
 29
 30	ret = clk_prepare_enable(hdmi_phy->pll);
 31	if (ret < 0)
 32		return ret;
 33
 34	hdmi_phy->conf->hdmi_phy_enable_tmds(hdmi_phy);
 35	return 0;
 36}
 37
 38static int mtk_hdmi_phy_power_off(struct phy *phy)
 39{
 40	struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);
 41
 42	hdmi_phy->conf->hdmi_phy_disable_tmds(hdmi_phy);
 43	clk_disable_unprepare(hdmi_phy->pll);
 44
 45	return 0;
 46}
 47
 48static int mtk_hdmi_phy_configure(struct phy *phy, union phy_configure_opts *opts)
 49{
 50	struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);
 51
 52	if (hdmi_phy->conf->hdmi_phy_configure)
 53		return hdmi_phy->conf->hdmi_phy_configure(phy, opts);
 54
 55	return 0;
 56}
 57
 58static const struct phy_ops *
 59mtk_hdmi_phy_dev_get_ops(const struct mtk_hdmi_phy *hdmi_phy)
 60{
 61	if (hdmi_phy && hdmi_phy->conf &&
 62	    hdmi_phy->conf->hdmi_phy_enable_tmds &&
 63	    hdmi_phy->conf->hdmi_phy_disable_tmds)
 64		return &mtk_hdmi_phy_dev_ops;
 65
 66	if (hdmi_phy)
 67		dev_err(hdmi_phy->dev, "Failed to get dev ops of phy\n");
 68	return NULL;
 69}
 70
 71static void mtk_hdmi_phy_clk_get_data(struct mtk_hdmi_phy *hdmi_phy,
 72				      struct clk_init_data *clk_init)
 73{
 74	clk_init->flags = hdmi_phy->conf->flags;
 75	clk_init->ops = hdmi_phy->conf->hdmi_phy_clk_ops;
 76}
 77
 78static int mtk_hdmi_phy_register_regulators(struct mtk_hdmi_phy *hdmi_phy)
 79{
 80	const struct regulator_desc *vreg_desc = hdmi_phy->conf->hdmi_phy_regulator_desc;
 81	const struct regulator_init_data vreg_init_data = {
 82		.constraints = {
 83			.valid_ops_mask = REGULATOR_CHANGE_STATUS,
 84		}
 85	};
 86	struct regulator_config vreg_config = {
 87		.dev = hdmi_phy->dev,
 88		.driver_data = hdmi_phy,
 89		.init_data = &vreg_init_data,
 90		.of_node = hdmi_phy->dev->of_node
 91	};
 92
 93	hdmi_phy->rdev = devm_regulator_register(hdmi_phy->dev, vreg_desc, &vreg_config);
 94	if (IS_ERR(hdmi_phy->rdev))
 95		return PTR_ERR(hdmi_phy->rdev);
 96
 97	return 0;
 98}
 99
100static int mtk_hdmi_phy_probe(struct platform_device *pdev)
101{
102	struct device *dev = &pdev->dev;
103	struct mtk_hdmi_phy *hdmi_phy;
104	struct clk *ref_clk;
105	const char *ref_clk_name;
106	struct clk_init_data clk_init = {
107		.num_parents = 1,
108		.parent_names = (const char * const *)&ref_clk_name,
109	};
110
111	struct phy *phy;
112	struct phy_provider *phy_provider;
113	int ret;
114
115	hdmi_phy = devm_kzalloc(dev, sizeof(*hdmi_phy), GFP_KERNEL);
116	if (!hdmi_phy)
117		return -ENOMEM;
118
119	hdmi_phy->regs = devm_platform_ioremap_resource(pdev, 0);
120	if (IS_ERR(hdmi_phy->regs))
121		return PTR_ERR(hdmi_phy->regs);
122
123	ref_clk = devm_clk_get(dev, "pll_ref");
124	if (IS_ERR(ref_clk))
125		return dev_err_probe(dev, PTR_ERR(ref_clk),
126				     "Failed to get PLL reference clock\n");
127
128	ref_clk_name = __clk_get_name(ref_clk);
129
130	ret = of_property_read_string(dev->of_node, "clock-output-names",
131				      &clk_init.name);
132	if (ret < 0)
133		return dev_err_probe(dev, ret, "Failed to read clock-output-names\n");
134
135	hdmi_phy->dev = dev;
136	hdmi_phy->conf =
137		(struct mtk_hdmi_phy_conf *)of_device_get_match_data(dev);
138	mtk_hdmi_phy_clk_get_data(hdmi_phy, &clk_init);
139	hdmi_phy->pll_hw.init = &clk_init;
140	hdmi_phy->pll = devm_clk_register(dev, &hdmi_phy->pll_hw);
141	if (IS_ERR(hdmi_phy->pll))
142		return dev_err_probe(dev, PTR_ERR(hdmi_phy->pll),
143				    "Failed to register PLL\n");
144
145	ret = of_property_read_u32(dev->of_node, "mediatek,ibias",
146				   &hdmi_phy->ibias);
147	if (ret < 0)
148		return dev_err_probe(dev, ret, "Failed to get ibias\n");
149
150	ret = of_property_read_u32(dev->of_node, "mediatek,ibias_up",
151				   &hdmi_phy->ibias_up);
152	if (ret < 0)
153		return dev_err_probe(dev, ret, "Failed to get ibias_up\n");
154
155	dev_info(dev, "Using default TX DRV impedance: 4.2k/36\n");
156	hdmi_phy->drv_imp_clk = 0x30;
157	hdmi_phy->drv_imp_d2 = 0x30;
158	hdmi_phy->drv_imp_d1 = 0x30;
159	hdmi_phy->drv_imp_d0 = 0x30;
160
161	phy = devm_phy_create(dev, NULL, mtk_hdmi_phy_dev_get_ops(hdmi_phy));
162	if (IS_ERR(phy))
163		return dev_err_probe(dev, PTR_ERR(phy), "Cannot create HDMI PHY\n");
164
165	phy_set_drvdata(phy, hdmi_phy);
166
167	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
168	if (IS_ERR(phy_provider))
169		return dev_err_probe(dev, PTR_ERR(phy_provider),
170				     "Failed to register HDMI PHY\n");
171
172	if (hdmi_phy->conf->pll_default_off)
173		hdmi_phy->conf->hdmi_phy_disable_tmds(hdmi_phy);
174
175	if (hdmi_phy->conf->hdmi_phy_regulator_desc) {
176		ret = mtk_hdmi_phy_register_regulators(hdmi_phy);
177		if (ret)
178			return ret;
179	}
180
181	return of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
182				   hdmi_phy->pll);
183}
184
185static const struct of_device_id mtk_hdmi_phy_match[] = {
186	{ .compatible = "mediatek,mt2701-hdmi-phy",
187	  .data = &mtk_hdmi_phy_2701_conf,
188	},
189	{ .compatible = "mediatek,mt8173-hdmi-phy",
190	  .data = &mtk_hdmi_phy_8173_conf,
191	},
192	{ .compatible = "mediatek,mt8195-hdmi-phy",
193	  .data = &mtk_hdmi_phy_8195_conf,
194	},
195	{},
196};
197MODULE_DEVICE_TABLE(of, mtk_hdmi_phy_match);
198
199static struct platform_driver mtk_hdmi_phy_driver = {
200	.probe = mtk_hdmi_phy_probe,
201	.driver = {
202		.name = "mediatek-hdmi-phy",
203		.of_match_table = mtk_hdmi_phy_match,
204	},
205};
206module_platform_driver(mtk_hdmi_phy_driver);
207
208MODULE_DESCRIPTION("MediaTek HDMI PHY Driver");
209MODULE_LICENSE("GPL v2");