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 static const struct regmap_config raa215300_regmap_config = {
  42         .reg_bits = 8,
  43         .val_bits = 8,
  44         .max_register = 0xff,
  45 };
  46
  47 static void raa215300_rtc_unregister_device(void *data)
  48 {
  49         i2c_unregister_device(data);
  50 }
  51
  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
  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");