// SPDX-License-Identifier: GPL-2.0
//
// Renesas RAA215300 PMIC driver
//
// Copyright (C) 2023 Renesas Electronics Corporation
//
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#define RAA215300_FAULT_LATCHED_STATUS_1 0x59
#define RAA215300_FAULT_LATCHED_STATUS_2 0x5a
#define RAA215300_FAULT_LATCHED_STATUS_3 0x5b
#define RAA215300_FAULT_LATCHED_STATUS_4 0x5c
#define RAA215300_FAULT_LATCHED_STATUS_6 0x5e
#define RAA215300_INT_MASK_1 0x64
#define RAA215300_INT_MASK_2 0x65
#define RAA215300_INT_MASK_3 0x66
#define RAA215300_INT_MASK_4 0x67
#define RAA215300_INT_MASK_6 0x68
#define RAA215300_REG_BLOCK_EN 0x6c
#define RAA215300_HW_REV 0xf8
#define RAA215300_INT_MASK_1_ALL GENMASK(5, 0)
#define RAA215300_INT_MASK_2_ALL GENMASK(3, 0)
#define RAA215300_INT_MASK_3_ALL GENMASK(5, 0)
#define RAA215300_INT_MASK_4_ALL BIT(0)
#define RAA215300_INT_MASK_6_ALL GENMASK(7, 0)
#define RAA215300_REG_BLOCK_EN_RTC_EN BIT(6)
#define RAA215300_RTC_DEFAULT_ADDR 0x6f
static const struct regmap_config raa215300_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0xff,
};
static void raa215300_rtc_unregister_device(void *data)
{
i2c_unregister_device(data);
}
static int raa215300_clk_present(struct i2c_client *client, const char *name)
{
struct clk *clk;
clk = devm_clk_get_optional(&client->dev, name);
if (IS_ERR(clk))
return PTR_ERR(clk);
return !!clk;
}
static int raa215300_i2c_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
const char *clkin_name = "clkin";
unsigned int pmic_version, val;
const char *xin_name = "xin";
const char *clk_name = NULL;
struct regmap *regmap;
int ret;
regmap = devm_regmap_init_i2c(client, &raa215300_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap),
"regmap i2c init failed\n");
ret = regmap_read(regmap, RAA215300_HW_REV, &pmic_version);
if (ret < 0)
return dev_err_probe(dev, ret, "HW rev read failed\n");
dev_dbg(dev, "RAA215300 PMIC version 0x%04x\n", pmic_version);
/* Clear all blocks except RTC, if enabled */
regmap_read(regmap, RAA215300_REG_BLOCK_EN, &val);
val &= RAA215300_REG_BLOCK_EN_RTC_EN;
regmap_write(regmap, RAA215300_REG_BLOCK_EN, val);
/* Clear the latched registers */
regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_1, &val);
regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_1, val);
regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_2, &val);
regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_2, val);
regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_3, &val);
regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_3, val);
regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_4, &val);
regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_4, val);
regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_6, &val);
regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_6, val);
/* Mask all the PMIC interrupts */
regmap_write(regmap, RAA215300_INT_MASK_1, RAA215300_INT_MASK_1_ALL);
regmap_write(regmap, RAA215300_INT_MASK_2, RAA215300_INT_MASK_2_ALL);
regmap_write(regmap, RAA215300_INT_MASK_3, RAA215300_INT_MASK_3_ALL);
regmap_write(regmap, RAA215300_INT_MASK_4, RAA215300_INT_MASK_4_ALL);
regmap_write(regmap, RAA215300_INT_MASK_6, RAA215300_INT_MASK_6_ALL);
ret = raa215300_clk_present(client, xin_name);
if (ret < 0) {
return ret;
} else if (ret) {
clk_name = xin_name;
} else {
ret = raa215300_clk_present(client, clkin_name);
if (ret < 0)
return ret;
if (ret)
clk_name = clkin_name;
}
if (clk_name) {
const char *name = pmic_version >= 0x12 ? "isl1208" : "raa215300_a0";
struct device_node *np = client->dev.of_node;
u32 addr = RAA215300_RTC_DEFAULT_ADDR;
struct i2c_board_info info = {};
struct i2c_client *rtc_client;
struct clk_hw *hw;
ssize_t size;
hw = devm_clk_hw_register_fixed_rate(dev, clk_name, NULL, 0, 32768);
if (IS_ERR(hw))
return PTR_ERR(hw);
ret = devm_clk_hw_register_clkdev(dev, hw, clk_name, NULL);
if (ret)
return dev_err_probe(dev, ret, "Failed to initialize clkdev\n");
if (np) {
int i;
i = of_property_match_string(np, "reg-names", "rtc");
if (i >= 0)
of_property_read_u32_index(np, "reg", i, &addr);
}
info.addr = addr;
if (client->irq > 0)
info.irq = client->irq;
size = strscpy(info.type, name, sizeof(info.type));
if (size < 0)
return dev_err_probe(dev, size,
"Invalid device name: %s\n", name);
/* Enable RTC block */
regmap_update_bits(regmap, RAA215300_REG_BLOCK_EN,
RAA215300_REG_BLOCK_EN_RTC_EN,
RAA215300_REG_BLOCK_EN_RTC_EN);
rtc_client = i2c_new_client_device(client->adapter, &info);
if (IS_ERR(rtc_client))
return PTR_ERR(rtc_client);
ret = devm_add_action_or_reset(dev,
raa215300_rtc_unregister_device,
rtc_client);
if (ret < 0)
return ret;
}
return 0;
}
static const struct of_device_id raa215300_dt_match[] = {
{ .compatible = "renesas,raa215300" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, raa215300_dt_match);
static struct i2c_driver raa215300_i2c_driver = {
.driver = {
.name = "raa215300",
.of_match_table = raa215300_dt_match,
},
.probe = raa215300_i2c_probe,
};
module_i2c_driver(raa215300_i2c_driver);
MODULE_DESCRIPTION("Renesas RAA215300 PMIC driver");
MODULE_AUTHOR("Fabrizio Castro <[email protected]>");
MODULE_AUTHOR("Biju Das <[email protected]>");
MODULE_LICENSE("GPL");
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