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191 lines
5.3 KiB
C
191 lines
5.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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//
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// Renesas RAA215300 PMIC driver
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//
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// Copyright (C) 2023 Renesas Electronics Corporation
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//
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#include <linux/clk.h>
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#include <linux/clkdev.h>
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#include <linux/clk-provider.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#define RAA215300_FAULT_LATCHED_STATUS_1 0x59
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#define RAA215300_FAULT_LATCHED_STATUS_2 0x5a
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#define RAA215300_FAULT_LATCHED_STATUS_3 0x5b
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#define RAA215300_FAULT_LATCHED_STATUS_4 0x5c
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#define RAA215300_FAULT_LATCHED_STATUS_6 0x5e
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#define RAA215300_INT_MASK_1 0x64
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#define RAA215300_INT_MASK_2 0x65
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#define RAA215300_INT_MASK_3 0x66
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#define RAA215300_INT_MASK_4 0x67
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#define RAA215300_INT_MASK_6 0x68
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#define RAA215300_REG_BLOCK_EN 0x6c
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#define RAA215300_HW_REV 0xf8
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#define RAA215300_INT_MASK_1_ALL GENMASK(5, 0)
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#define RAA215300_INT_MASK_2_ALL GENMASK(3, 0)
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#define RAA215300_INT_MASK_3_ALL GENMASK(5, 0)
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#define RAA215300_INT_MASK_4_ALL BIT(0)
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#define RAA215300_INT_MASK_6_ALL GENMASK(7, 0)
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#define RAA215300_REG_BLOCK_EN_RTC_EN BIT(6)
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#define RAA215300_RTC_DEFAULT_ADDR 0x6f
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const char *clkin_name = "clkin";
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const char *xin_name = "xin";
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static struct clk *clk;
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static const struct regmap_config raa215300_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = 0xff,
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};
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static void raa215300_rtc_unregister_device(void *data)
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{
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i2c_unregister_device(data);
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if (!clk) {
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clk_unregister_fixed_rate(clk);
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clk = NULL;
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}
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}
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static int raa215300_clk_present(struct i2c_client *client, const char *name)
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{
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struct clk *clk;
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clk = devm_clk_get_optional(&client->dev, name);
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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return !!clk;
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}
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static int raa215300_i2c_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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const char *clk_name = xin_name;
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unsigned int pmic_version, val;
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struct regmap *regmap;
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int ret;
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regmap = devm_regmap_init_i2c(client, &raa215300_regmap_config);
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if (IS_ERR(regmap))
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return dev_err_probe(dev, PTR_ERR(regmap),
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"regmap i2c init failed\n");
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ret = regmap_read(regmap, RAA215300_HW_REV, &pmic_version);
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if (ret < 0)
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return dev_err_probe(dev, ret, "HW rev read failed\n");
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dev_dbg(dev, "RAA215300 PMIC version 0x%04x\n", pmic_version);
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/* Clear all blocks except RTC, if enabled */
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regmap_read(regmap, RAA215300_REG_BLOCK_EN, &val);
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val &= RAA215300_REG_BLOCK_EN_RTC_EN;
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regmap_write(regmap, RAA215300_REG_BLOCK_EN, val);
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/*Clear the latched registers */
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regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_1, &val);
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regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_1, val);
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regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_2, &val);
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regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_2, val);
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regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_3, &val);
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regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_3, val);
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regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_4, &val);
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regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_4, val);
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regmap_read(regmap, RAA215300_FAULT_LATCHED_STATUS_6, &val);
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regmap_write(regmap, RAA215300_FAULT_LATCHED_STATUS_6, val);
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/* Mask all the PMIC interrupts */
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regmap_write(regmap, RAA215300_INT_MASK_1, RAA215300_INT_MASK_1_ALL);
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regmap_write(regmap, RAA215300_INT_MASK_2, RAA215300_INT_MASK_2_ALL);
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regmap_write(regmap, RAA215300_INT_MASK_3, RAA215300_INT_MASK_3_ALL);
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regmap_write(regmap, RAA215300_INT_MASK_4, RAA215300_INT_MASK_4_ALL);
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regmap_write(regmap, RAA215300_INT_MASK_6, RAA215300_INT_MASK_6_ALL);
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ret = raa215300_clk_present(client, xin_name);
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if (ret < 0) {
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return ret;
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} else if (!ret) {
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ret = raa215300_clk_present(client, clkin_name);
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if (ret < 0)
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return ret;
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clk_name = clkin_name;
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}
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if (ret) {
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char *name = pmic_version >= 0x12 ? "isl1208" : "raa215300_a0";
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struct device_node *np = client->dev.of_node;
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u32 addr = RAA215300_RTC_DEFAULT_ADDR;
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struct i2c_board_info info = {};
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struct i2c_client *rtc_client;
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ssize_t size;
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clk = clk_register_fixed_rate(NULL, clk_name, NULL, 0, 32000);
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clk_register_clkdev(clk, clk_name, NULL);
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if (np) {
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int i;
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i = of_property_match_string(np, "reg-names", "rtc");
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if (i >= 0)
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of_property_read_u32_index(np, "reg", i, &addr);
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}
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info.addr = addr;
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if (client->irq > 0)
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info.irq = client->irq;
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size = strscpy(info.type, name, sizeof(info.type));
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if (size < 0)
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return dev_err_probe(dev, size,
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"Invalid device name: %s\n", name);
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/* Enable RTC block */
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regmap_update_bits(regmap, RAA215300_REG_BLOCK_EN,
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RAA215300_REG_BLOCK_EN_RTC_EN,
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RAA215300_REG_BLOCK_EN_RTC_EN);
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rtc_client = i2c_new_client_device(client->adapter, &info);
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if (IS_ERR(rtc_client))
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return PTR_ERR(rtc_client);
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ret = devm_add_action_or_reset(dev,
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raa215300_rtc_unregister_device,
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rtc_client);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static const struct of_device_id raa215300_dt_match[] = {
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{ .compatible = "renesas,raa215300" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, raa215300_dt_match);
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static struct i2c_driver raa215300_i2c_driver = {
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.driver = {
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.name = "raa215300",
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.of_match_table = raa215300_dt_match,
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},
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.probe_new = raa215300_i2c_probe,
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};
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module_i2c_driver(raa215300_i2c_driver);
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MODULE_DESCRIPTION("Renesas RAA215300 PMIC driver");
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MODULE_AUTHOR("Fabrizio Castro <fabrizio.castro.jz@renesas.com>");
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MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
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MODULE_LICENSE("GPL");
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