1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Renesas RAA215300 PMIC driver
4 //
5 // Copyright (C) 2023 Renesas Electronics Corporation
6 //
7
8 #include <linux/clk.h>
9 #include <linux/clkdev.h>
10 #include <linux/clk-provider.h>
11 #include <linux/err.h>
12 #include <linux/i2c.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/regmap.h>
16
17 #define RAA215300_FAULT_LATCHED_STATUS_1 0x59
18 #define RAA215300_FAULT_LATCHED_STATUS_2 0x5a
19 #define RAA215300_FAULT_LATCHED_STATUS_3 0x5b
20 #define RAA215300_FAULT_LATCHED_STATUS_4 0x5c
21 #define RAA215300_FAULT_LATCHED_STATUS_6 0x5e
22
23 #define RAA215300_INT_MASK_1 0x64
24 #define RAA215300_INT_MASK_2 0x65
25 #define RAA215300_INT_MASK_3 0x66
26 #define RAA215300_INT_MASK_4 0x67
27 #define RAA215300_INT_MASK_6 0x68
28
29 #define RAA215300_REG_BLOCK_EN 0x6c
30 #define RAA215300_HW_REV 0xf8
31
32 #define RAA215300_INT_MASK_1_ALL GENMASK(5, 0)
33 #define RAA215300_INT_MASK_2_ALL GENMASK(3, 0)
34 #define RAA215300_INT_MASK_3_ALL GENMASK(5, 0)
35 #define RAA215300_INT_MASK_4_ALL BIT(0)
36 #define RAA215300_INT_MASK_6_ALL GENMASK(7, 0)
37
38 #define RAA215300_REG_BLOCK_EN_RTC_EN BIT(6)
39 #define RAA215300_RTC_DEFAULT_ADDR 0x6f
40
41 static const struct regmap_config raa215300_regmap_config = {
42 .reg_bits = 8,
43 .val_bits = 8,
44 .max_register = 0xff,
45 };
46
raa215300_rtc_unregister_device(void * data)47 static void raa215300_rtc_unregister_device(void *data)
48 {
49 i2c_unregister_device(data);
50 }
51
raa215300_clk_present(struct i2c_client * client,const char * name)52 static int raa215300_clk_present(struct i2c_client *client, const char *name)
53 {
54 struct clk *clk;
55
56 clk = devm_clk_get_optional(&client->dev, name);
57 if (IS_ERR(clk))
58 return PTR_ERR(clk);
59
60 return !!clk;
61 }
62
raa215300_i2c_probe(struct i2c_client * client)63 static int raa215300_i2c_probe(struct i2c_client *client)
64 {
65 struct device *dev = &client->dev;
66 const char *clkin_name = "clkin";
67 unsigned int pmic_version, val;
68 const char *xin_name = "xin";
69 const char *clk_name = NULL;
70 struct regmap *regmap;
71 int ret;
72
73 regmap = devm_regmap_init_i2c(client, &raa215300_regmap_config);
74 if (IS_ERR(regmap))
75 return dev_err_probe(dev, PTR_ERR(regmap),
76 "regmap i2c init failed\n");
77
78 ret = regmap_read(regmap, RAA215300_HW_REV, &pmic_version);
79 if (ret < 0)
80 return dev_err_probe(dev, ret, "HW rev read failed\n");
81
82 dev_dbg(dev, "RAA215300 PMIC version 0x%04x\n", pmic_version);
83
84 /* Clear all blocks except RTC, if enabled */
85 regmap_read(regmap, RAA215300_REG_BLOCK_EN, &val);
86 val &= RAA215300_REG_BLOCK_EN_RTC_EN;
87 regmap_write(regmap, RAA215300_REG_BLOCK_EN, val);
88
89 /* Clear the latched registers */
90 regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_1, &val);
91 regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_1, val);
92 regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_2, &val);
93 regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_2, val);
94 regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_3, &val);
95 regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_3, val);
96 regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_4, &val);
97 regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_4, val);
98 regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_6, &val);
99 regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_6, val);
100
101 /* Mask all the PMIC interrupts */
102 regmap_write(regmap, RAA215300_INT_MASK_1, RAA215300_INT_MASK_1_ALL);
103 regmap_write(regmap, RAA215300_INT_MASK_2, RAA215300_INT_MASK_2_ALL);
104 regmap_write(regmap, RAA215300_INT_MASK_3, RAA215300_INT_MASK_3_ALL);
105 regmap_write(regmap, RAA215300_INT_MASK_4, RAA215300_INT_MASK_4_ALL);
106 regmap_write(regmap, RAA215300_INT_MASK_6, RAA215300_INT_MASK_6_ALL);
107
108 ret = raa215300_clk_present(client, xin_name);
109 if (ret < 0) {
110 return ret;
111 } else if (ret) {
112 clk_name = xin_name;
113 } else {
114 ret = raa215300_clk_present(client, clkin_name);
115 if (ret < 0)
116 return ret;
117 if (ret)
118 clk_name = clkin_name;
119 }
120
121 if (clk_name) {
122 const char *name = pmic_version >= 0x12 ? "isl1208" : "raa215300_a0";
123 struct device_node *np = client->dev.of_node;
124 u32 addr = RAA215300_RTC_DEFAULT_ADDR;
125 struct i2c_board_info info = {};
126 struct i2c_client *rtc_client;
127 struct clk_hw *hw;
128 ssize_t size;
129
130 hw = devm_clk_hw_register_fixed_rate(dev, clk_name, NULL, 0, 32768);
131 if (IS_ERR(hw))
132 return PTR_ERR(hw);
133
134 ret = devm_clk_hw_register_clkdev(dev, hw, clk_name, NULL);
135 if (ret)
136 return dev_err_probe(dev, ret, "Failed to initialize clkdev\n");
137
138 if (np) {
139 int i;
140
141 i = of_property_match_string(np, "reg-names", "rtc");
142 if (i >= 0)
143 of_property_read_u32_index(np, "reg", i, &addr);
144 }
145
146 info.addr = addr;
147 if (client->irq > 0)
148 info.irq = client->irq;
149
150 size = strscpy(info.type, name, sizeof(info.type));
151 if (size < 0)
152 return dev_err_probe(dev, size,
153 "Invalid device name: %s\n", name);
154
155 /* Enable RTC block */
156 regmap_update_bits(regmap, RAA215300_REG_BLOCK_EN,
157 RAA215300_REG_BLOCK_EN_RTC_EN,
158 RAA215300_REG_BLOCK_EN_RTC_EN);
159
160 rtc_client = i2c_new_client_device(client->adapter, &info);
161 if (IS_ERR(rtc_client))
162 return PTR_ERR(rtc_client);
163
164 ret = devm_add_action_or_reset(dev,
165 raa215300_rtc_unregister_device,
166 rtc_client);
167 if (ret < 0)
168 return ret;
169 }
170
171 return 0;
172 }
173
174 static const struct of_device_id raa215300_dt_match[] = {
175 { .compatible = "renesas,raa215300" },
176 { /* sentinel */ }
177 };
178 MODULE_DEVICE_TABLE(of, raa215300_dt_match);
179
180 static struct i2c_driver raa215300_i2c_driver = {
181 .driver = {
182 .name = "raa215300",
183 .of_match_table = raa215300_dt_match,
184 },
185 .probe = raa215300_i2c_probe,
186 };
187 module_i2c_driver(raa215300_i2c_driver);
188
189 MODULE_DESCRIPTION("Renesas RAA215300 PMIC driver");
190 MODULE_AUTHOR("Fabrizio Castro <fabrizio.castro.jz@renesas.com>");
191 MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
192 MODULE_LICENSE("GPL");
193