drivers/regulator/raa215300.c

   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 const char *clkin_name = "clkin";
  42 const char *xin_name = "xin";
  43 static struct clk *clk;
  44
  45 static const struct regmap_config raa215300_regmap_config = {
  46         .reg_bits = 8,
  47         .val_bits = 8,
  48         .max_register = 0xff,
  49 };
  50
  51 static void raa215300_rtc_unregister_device(void *data)
  52 {
  53         i2c_unregister_device(data);
  54         if (!clk) {
  55                 clk_unregister_fixed_rate(clk);
  56                 clk = NULL;
  57         }
  58 }
  59
  60 static int raa215300_clk_present(struct i2c_client *client, const char *name)
  61 {
  62         struct clk *clk;
  63
  64         clk = devm_clk_get_optional(&client->dev, name);
  65         if (IS_ERR(clk))
  66                 return PTR_ERR(clk);
  67
  68         return !!clk;
  69 }
  70
  71 static int raa215300_i2c_probe(struct i2c_client *client)
  72 {
  73         struct device *dev = &client->dev;
  74         const char *clk_name = xin_name;
  75         unsigned int pmic_version, val;
  76         struct regmap *regmap;
  77         int ret;
  78
  79         regmap = devm_regmap_init_i2c(client, &raa215300_regmap_config);
  80         if (IS_ERR(regmap))
  81                 return dev_err_probe(dev, PTR_ERR(regmap),
  82                                      "regmap i2c init failed\n");
  83
  84         ret = regmap_read(regmap, RAA215300_HW_REV, &pmic_version);
  85         if (ret < 0)
  86                 return dev_err_probe(dev, ret, "HW rev read failed\n");
  87
  88         dev_dbg(dev, "RAA215300 PMIC version 0x%04x\n", pmic_version);
  89
  90         /* Clear all blocks except RTC, if enabled */
  91         regmap_read(regmap, RAA215300_REG_BLOCK_EN, &val);
  92         val &= RAA215300_REG_BLOCK_EN_RTC_EN;
  93         regmap_write(regmap, RAA215300_REG_BLOCK_EN, val);
  94
  95         /*Clear the latched registers */
  96         regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_1, &val);
  97         regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_1, val);
  98         regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_2, &val);
  99         regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_2, val);
 100         regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_3, &val);
 101         regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_3, val);
 102         regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_4, &val);
 103         regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_4, val);
 104         regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_6, &val);
 105         regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_6, val);
 106
 107         /* Mask all the PMIC interrupts */
 108         regmap_write(regmap, RAA215300_INT_MASK_1, RAA215300_INT_MASK_1_ALL);
 109         regmap_write(regmap, RAA215300_INT_MASK_2, RAA215300_INT_MASK_2_ALL);
 110         regmap_write(regmap, RAA215300_INT_MASK_3, RAA215300_INT_MASK_3_ALL);
 111         regmap_write(regmap, RAA215300_INT_MASK_4, RAA215300_INT_MASK_4_ALL);
 112         regmap_write(regmap, RAA215300_INT_MASK_6, RAA215300_INT_MASK_6_ALL);
 113
 114         ret = raa215300_clk_present(client, xin_name);
 115         if (ret < 0) {
 116                 return ret;
 117         } else if (!ret) {
 118                 ret = raa215300_clk_present(client, clkin_name);
 119                 if (ret < 0)
 120                         return ret;
 121
 122                 clk_name = clkin_name;
 123         }
 124
 125         if (ret) {
 126                 char *name = pmic_version >= 0x12 ? "isl1208" : "raa215300_a0";
 127                 struct device_node *np = client->dev.of_node;
 128                 u32 addr = RAA215300_RTC_DEFAULT_ADDR;
 129                 struct i2c_board_info info = {};
 130                 struct i2c_client *rtc_client;
 131                 ssize_t size;
 132
 133                 clk = clk_register_fixed_rate(NULL, clk_name, NULL, 0, 32000);
 134                 clk_register_clkdev(clk, clk_name, NULL);
 135
 136                 if (np) {
 137                         int i;
 138
 139                         i = of_property_match_string(np, "reg-names", "rtc");
 140                         if (i >= 0)
 141                                 of_property_read_u32_index(np, "reg", i, &addr);
 142                 }
 143
 144                 info.addr = addr;
 145                 if (client->irq > 0)
 146                         info.irq = client->irq;
 147
 148                 size = strscpy(info.type, name, sizeof(info.type));
 149                 if (size < 0)
 150                         return dev_err_probe(dev, size,
 151                                              "Invalid device name: %s\n", name);
 152
 153                 /* Enable RTC block */
 154                 regmap_update_bits(regmap, RAA215300_REG_BLOCK_EN,
 155                                    RAA215300_REG_BLOCK_EN_RTC_EN,
 156                                    RAA215300_REG_BLOCK_EN_RTC_EN);
 157
 158                 rtc_client = i2c_new_client_device(client->adapter, &info);
 159                 if (IS_ERR(rtc_client))
 160                         return PTR_ERR(rtc_client);
 161
 162                 ret = devm_add_action_or_reset(dev,
 163                                                raa215300_rtc_unregister_device,
 164                                                rtc_client);
 165                 if (ret < 0)
 166                         return ret;
 167         }
 168
 169         return 0;
 170 }
 171
 172 static const struct of_device_id raa215300_dt_match[] = {
 173         { .compatible = "renesas,raa215300" },
 174         { /* sentinel */ }
 175 };
 176 MODULE_DEVICE_TABLE(of, raa215300_dt_match);
 177
 178 static struct i2c_driver raa215300_i2c_driver = {
 179         .driver = {
 180                 .name = "raa215300",
 181                 .of_match_table = raa215300_dt_match,
 182         },
 183         .probe_new = raa215300_i2c_probe,
 184 };
 185 module_i2c_driver(raa215300_i2c_driver);
 186
 187 MODULE_DESCRIPTION("Renesas RAA215300 PMIC driver");
 188 MODULE_AUTHOR("Fabrizio Castro <fabrizio.castro.jz@renesas.com>");
 189 MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
 190 MODULE_LICENSE("GPL");