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
 41static const struct regmap_config raa215300_regmap_config = {
 42	.reg_bits = 8,
 43	.val_bits = 8,
 44	.max_register = 0xff,
 45};
 46
 47static void raa215300_rtc_unregister_device(void *data)
 48{
 49	i2c_unregister_device(data);
 50}
 51
 52static 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
 63static 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
174static const struct of_device_id raa215300_dt_match[] = {
175	{ .compatible = "renesas,raa215300" },
176	{ /* sentinel */ }
177};
178MODULE_DEVICE_TABLE(of, raa215300_dt_match);
179
180static 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};
187module_i2c_driver(raa215300_i2c_driver);
188
189MODULE_DESCRIPTION("Renesas RAA215300 PMIC driver");
190MODULE_AUTHOR("Fabrizio Castro <fabrizio.castro.jz@renesas.com>");
191MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
192MODULE_LICENSE("GPL");