1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2020 Texas Instruments Incorporated - https://www.ti.com/
6 #include <linux/clk-provider.h>
7 #include <linux/kernel.h>
8 #include <linux/mfd/syscon.h>
9 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/regmap.h>
12 #include <linux/slab.h>
14 struct ti_syscon_gate_clk_priv {
16 struct regmap *regmap;
21 struct ti_syscon_gate_clk_data {
28 ti_syscon_gate_clk_priv *to_ti_syscon_gate_clk_priv(struct clk_hw *hw)
30 return container_of(hw, struct ti_syscon_gate_clk_priv, hw);
33 static int ti_syscon_gate_clk_enable(struct clk_hw *hw)
35 struct ti_syscon_gate_clk_priv *priv = to_ti_syscon_gate_clk_priv(hw);
37 return regmap_write_bits(priv->regmap, priv->reg, priv->idx,
41 static void ti_syscon_gate_clk_disable(struct clk_hw *hw)
43 struct ti_syscon_gate_clk_priv *priv = to_ti_syscon_gate_clk_priv(hw);
45 regmap_write_bits(priv->regmap, priv->reg, priv->idx, 0);
48 static int ti_syscon_gate_clk_is_enabled(struct clk_hw *hw)
51 struct ti_syscon_gate_clk_priv *priv = to_ti_syscon_gate_clk_priv(hw);
53 regmap_read(priv->regmap, priv->reg, &val);
55 return !!(val & priv->idx);
58 static const struct clk_ops ti_syscon_gate_clk_ops = {
59 .enable = ti_syscon_gate_clk_enable,
60 .disable = ti_syscon_gate_clk_disable,
61 .is_enabled = ti_syscon_gate_clk_is_enabled,
65 *ti_syscon_gate_clk_register(struct device *dev, struct regmap *regmap,
66 const char *parent_name,
67 const struct ti_syscon_gate_clk_data *data)
69 struct ti_syscon_gate_clk_priv *priv;
70 struct clk_init_data init;
74 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
76 return ERR_PTR(-ENOMEM);
78 init.ops = &ti_syscon_gate_clk_ops;
80 name = kasprintf(GFP_KERNEL, "%s:%s", data->name, parent_name);
82 init.parent_names = &parent_name;
84 init.flags = CLK_SET_RATE_PARENT;
86 init.name = data->name;
87 init.parent_names = NULL;
92 priv->regmap = regmap;
93 priv->reg = data->offset;
94 priv->idx = BIT(data->bit_idx);
95 priv->hw.init = &init;
97 ret = devm_clk_hw_register(dev, &priv->hw);
108 static int ti_syscon_gate_clk_probe(struct platform_device *pdev)
110 const struct ti_syscon_gate_clk_data *data, *p;
111 struct clk_hw_onecell_data *hw_data;
112 struct device *dev = &pdev->dev;
113 int num_clks, num_parents, i;
114 const char *parent_name;
115 struct regmap *regmap;
117 data = device_get_match_data(dev);
121 regmap = device_node_to_regmap(dev->of_node);
123 return dev_err_probe(dev, PTR_ERR(regmap),
124 "failed to get regmap\n");
127 for (p = data; p->name; p++)
130 num_parents = of_clk_get_parent_count(dev->of_node);
131 if (of_device_is_compatible(dev->of_node, "ti,am62-audio-refclk") &&
133 return dev_err_probe(dev, -EINVAL,
134 "must specify a parent clock\n");
137 hw_data = devm_kzalloc(dev, struct_size(hw_data, hws, num_clks),
142 hw_data->num = num_clks;
144 parent_name = of_clk_get_parent_name(dev->of_node, 0);
145 for (i = 0; i < num_clks; i++) {
146 hw_data->hws[i] = ti_syscon_gate_clk_register(dev, regmap,
149 if (IS_ERR(hw_data->hws[i]))
150 dev_warn(dev, "failed to register %s\n",
155 return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
157 return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_data);
160 #define TI_SYSCON_CLK_GATE(_name, _offset, _bit_idx) \
163 .offset = (_offset), \
164 .bit_idx = (_bit_idx), \
167 static const struct ti_syscon_gate_clk_data am654_clk_data[] = {
168 TI_SYSCON_CLK_GATE("ehrpwm_tbclk0", 0x0, 0),
169 TI_SYSCON_CLK_GATE("ehrpwm_tbclk1", 0x4, 0),
170 TI_SYSCON_CLK_GATE("ehrpwm_tbclk2", 0x8, 0),
171 TI_SYSCON_CLK_GATE("ehrpwm_tbclk3", 0xc, 0),
172 TI_SYSCON_CLK_GATE("ehrpwm_tbclk4", 0x10, 0),
173 TI_SYSCON_CLK_GATE("ehrpwm_tbclk5", 0x14, 0),
177 static const struct ti_syscon_gate_clk_data am64_clk_data[] = {
178 TI_SYSCON_CLK_GATE("epwm_tbclk0", 0x0, 0),
179 TI_SYSCON_CLK_GATE("epwm_tbclk1", 0x0, 1),
180 TI_SYSCON_CLK_GATE("epwm_tbclk2", 0x0, 2),
181 TI_SYSCON_CLK_GATE("epwm_tbclk3", 0x0, 3),
182 TI_SYSCON_CLK_GATE("epwm_tbclk4", 0x0, 4),
183 TI_SYSCON_CLK_GATE("epwm_tbclk5", 0x0, 5),
184 TI_SYSCON_CLK_GATE("epwm_tbclk6", 0x0, 6),
185 TI_SYSCON_CLK_GATE("epwm_tbclk7", 0x0, 7),
186 TI_SYSCON_CLK_GATE("epwm_tbclk8", 0x0, 8),
190 static const struct ti_syscon_gate_clk_data am62_clk_data[] = {
191 TI_SYSCON_CLK_GATE("epwm_tbclk0", 0x0, 0),
192 TI_SYSCON_CLK_GATE("epwm_tbclk1", 0x0, 1),
193 TI_SYSCON_CLK_GATE("epwm_tbclk2", 0x0, 2),
197 static const struct ti_syscon_gate_clk_data am62_audio_clk_data[] = {
198 TI_SYSCON_CLK_GATE("audio_refclk", 0x0, 15),
202 static const struct of_device_id ti_syscon_gate_clk_ids[] = {
204 .compatible = "ti,am654-ehrpwm-tbclk",
205 .data = &am654_clk_data,
208 .compatible = "ti,am64-epwm-tbclk",
209 .data = &am64_clk_data,
212 .compatible = "ti,am62-epwm-tbclk",
213 .data = &am62_clk_data,
216 .compatible = "ti,am62-audio-refclk",
217 .data = &am62_audio_clk_data,
221 MODULE_DEVICE_TABLE(of, ti_syscon_gate_clk_ids);
223 static struct platform_driver ti_syscon_gate_clk_driver = {
224 .probe = ti_syscon_gate_clk_probe,
226 .name = "ti-syscon-gate-clk",
227 .of_match_table = ti_syscon_gate_clk_ids,
230 module_platform_driver(ti_syscon_gate_clk_driver);
232 MODULE_AUTHOR("Vignesh Raghavendra <vigneshr@ti.com>");
233 MODULE_DESCRIPTION("Syscon backed gate-clock driver");
234 MODULE_LICENSE("GPL");