1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Clkout driver for Rockchip RK808 4 * 5 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd 6 * 7 * Author:Chris Zhong <zyw@rock-chips.com> 8 */ 9 10 #include <linux/clk-provider.h> 11 #include <linux/module.h> 12 #include <linux/slab.h> 13 #include <linux/platform_device.h> 14 #include <linux/mfd/rk808.h> 15 #include <linux/i2c.h> 16 17 struct rk808_clkout { 18 struct rk808 *rk808; 19 struct clk_hw clkout1_hw; 20 struct clk_hw clkout2_hw; 21 }; 22 23 static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw, 24 unsigned long parent_rate) 25 { 26 return 32768; 27 } 28 29 static int rk808_clkout2_enable(struct clk_hw *hw, bool enable) 30 { 31 struct rk808_clkout *rk808_clkout = container_of(hw, 32 struct rk808_clkout, 33 clkout2_hw); 34 struct rk808 *rk808 = rk808_clkout->rk808; 35 36 return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG, 37 CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0); 38 } 39 40 static int rk808_clkout2_prepare(struct clk_hw *hw) 41 { 42 return rk808_clkout2_enable(hw, true); 43 } 44 45 static void rk808_clkout2_unprepare(struct clk_hw *hw) 46 { 47 rk808_clkout2_enable(hw, false); 48 } 49 50 static int rk808_clkout2_is_prepared(struct clk_hw *hw) 51 { 52 struct rk808_clkout *rk808_clkout = container_of(hw, 53 struct rk808_clkout, 54 clkout2_hw); 55 struct rk808 *rk808 = rk808_clkout->rk808; 56 uint32_t val; 57 58 int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val); 59 60 if (ret < 0) 61 return ret; 62 63 return (val & CLK32KOUT2_EN) ? 1 : 0; 64 } 65 66 static const struct clk_ops rk808_clkout1_ops = { 67 .recalc_rate = rk808_clkout_recalc_rate, 68 }; 69 70 static const struct clk_ops rk808_clkout2_ops = { 71 .prepare = rk808_clkout2_prepare, 72 .unprepare = rk808_clkout2_unprepare, 73 .is_prepared = rk808_clkout2_is_prepared, 74 .recalc_rate = rk808_clkout_recalc_rate, 75 }; 76 77 static struct clk_hw * 78 of_clk_rk808_get(struct of_phandle_args *clkspec, void *data) 79 { 80 struct rk808_clkout *rk808_clkout = data; 81 unsigned int idx = clkspec->args[0]; 82 83 if (idx >= 2) { 84 pr_err("%s: invalid index %u\n", __func__, idx); 85 return ERR_PTR(-EINVAL); 86 } 87 88 return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw; 89 } 90 91 static int rk817_clkout2_enable(struct clk_hw *hw, bool enable) 92 { 93 struct rk808_clkout *rk808_clkout = container_of(hw, 94 struct rk808_clkout, 95 clkout2_hw); 96 struct rk808 *rk808 = rk808_clkout->rk808; 97 98 return regmap_update_bits(rk808->regmap, RK817_SYS_CFG(1), 99 RK817_CLK32KOUT2_EN, 100 enable ? RK817_CLK32KOUT2_EN : 0); 101 } 102 103 static int rk817_clkout2_prepare(struct clk_hw *hw) 104 { 105 return rk817_clkout2_enable(hw, true); 106 } 107 108 static void rk817_clkout2_unprepare(struct clk_hw *hw) 109 { 110 rk817_clkout2_enable(hw, false); 111 } 112 113 static int rk817_clkout2_is_prepared(struct clk_hw *hw) 114 { 115 struct rk808_clkout *rk808_clkout = container_of(hw, 116 struct rk808_clkout, 117 clkout2_hw); 118 struct rk808 *rk808 = rk808_clkout->rk808; 119 unsigned int val; 120 121 int ret = regmap_read(rk808->regmap, RK817_SYS_CFG(1), &val); 122 123 if (ret < 0) 124 return 0; 125 126 return (val & RK817_CLK32KOUT2_EN) ? 1 : 0; 127 } 128 129 static const struct clk_ops rk817_clkout2_ops = { 130 .prepare = rk817_clkout2_prepare, 131 .unprepare = rk817_clkout2_unprepare, 132 .is_prepared = rk817_clkout2_is_prepared, 133 .recalc_rate = rk808_clkout_recalc_rate, 134 }; 135 136 static const struct clk_ops *rkpmic_get_ops(long variant) 137 { 138 switch (variant) { 139 case RK809_ID: 140 case RK817_ID: 141 return &rk817_clkout2_ops; 142 /* 143 * For the default case, it match the following PMIC type. 144 * RK805_ID 145 * RK808_ID 146 * RK818_ID 147 */ 148 default: 149 return &rk808_clkout2_ops; 150 } 151 } 152 153 static int rk808_clkout_probe(struct platform_device *pdev) 154 { 155 struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent); 156 struct i2c_client *client = rk808->i2c; 157 struct device_node *node = client->dev.of_node; 158 struct clk_init_data init = {}; 159 struct rk808_clkout *rk808_clkout; 160 int ret; 161 162 rk808_clkout = devm_kzalloc(&client->dev, 163 sizeof(*rk808_clkout), GFP_KERNEL); 164 if (!rk808_clkout) 165 return -ENOMEM; 166 167 rk808_clkout->rk808 = rk808; 168 169 init.parent_names = NULL; 170 init.num_parents = 0; 171 init.name = "rk808-clkout1"; 172 init.ops = &rk808_clkout1_ops; 173 rk808_clkout->clkout1_hw.init = &init; 174 175 /* optional override of the clockname */ 176 of_property_read_string_index(node, "clock-output-names", 177 0, &init.name); 178 179 ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout1_hw); 180 if (ret) 181 return ret; 182 183 init.name = "rk808-clkout2"; 184 init.ops = rkpmic_get_ops(rk808->variant); 185 rk808_clkout->clkout2_hw.init = &init; 186 187 /* optional override of the clockname */ 188 of_property_read_string_index(node, "clock-output-names", 189 1, &init.name); 190 191 ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout2_hw); 192 if (ret) 193 return ret; 194 195 return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rk808_get, 196 rk808_clkout); 197 } 198 199 static struct platform_driver rk808_clkout_driver = { 200 .probe = rk808_clkout_probe, 201 .driver = { 202 .name = "rk808-clkout", 203 }, 204 }; 205 206 module_platform_driver(rk808_clkout_driver); 207 208 MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs"); 209 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>"); 210 MODULE_LICENSE("GPL"); 211 MODULE_ALIAS("platform:rk808-clkout"); 212