Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * max8952.c - Voltage and current regulation for the Maxim 8952
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2010 Samsung Electronics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * MyungJoo Ham <myungjoo.ham@samsung.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/regulator/driver.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/regulator/max8952.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/regulator/of_regulator.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) /* Registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	MAX8952_REG_MODE0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	MAX8952_REG_MODE1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	MAX8952_REG_MODE2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	MAX8952_REG_MODE3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	MAX8952_REG_CONTROL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	MAX8952_REG_SYNC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	MAX8952_REG_RAMP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	MAX8952_REG_CHIP_ID1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	MAX8952_REG_CHIP_ID2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) struct max8952_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	struct i2c_client	*client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	struct max8952_platform_data *pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	struct gpio_desc *vid0_gpiod;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	struct gpio_desc *vid1_gpiod;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	bool vid0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	bool vid1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) static int max8952_read_reg(struct max8952_data *max8952, u8 reg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	int ret = i2c_smbus_read_byte_data(max8952->client, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	if (ret > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 		ret &= 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static int max8952_write_reg(struct max8952_data *max8952,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		u8 reg, u8 value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	return i2c_smbus_write_byte_data(max8952->client, reg, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) static int max8952_list_voltage(struct regulator_dev *rdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		unsigned int selector)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	if (rdev_get_id(rdev) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	return (max8952->pdata->dvs_mode[selector] * 10 + 770) * 1000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) static int max8952_get_voltage_sel(struct regulator_dev *rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	u8 vid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (max8952->vid0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		vid += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	if (max8952->vid1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		vid += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	return vid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) static int max8952_set_voltage_sel(struct regulator_dev *rdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 				   unsigned selector)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (!max8952->vid0_gpiod || !max8952->vid1_gpiod) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		/* DVS not supported */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	max8952->vid0 = selector & 0x1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	max8952->vid1 = (selector >> 1) & 0x1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	gpiod_set_value(max8952->vid0_gpiod, max8952->vid0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	gpiod_set_value(max8952->vid1_gpiod, max8952->vid1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static const struct regulator_ops max8952_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	.list_voltage		= max8952_list_voltage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	.get_voltage_sel	= max8952_get_voltage_sel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	.set_voltage_sel	= max8952_set_voltage_sel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static const struct regulator_desc regulator = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	.name		= "MAX8952_VOUT",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	.id		= 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	.n_voltages	= MAX8952_NUM_DVS_MODE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	.ops		= &max8952_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	.type		= REGULATOR_VOLTAGE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	.owner		= THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) #ifdef CONFIG_OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static const struct of_device_id max8952_dt_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	{ .compatible = "maxim,max8952" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	{},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) MODULE_DEVICE_TABLE(of, max8952_dt_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static struct max8952_platform_data *max8952_parse_dt(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	struct max8952_platform_data *pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	struct device_node *np = dev->of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	if (!pd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	if (of_property_read_u32(np, "max8952,default-mode", &pd->default_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		dev_warn(dev, "Default mode not specified, assuming 0\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	ret = of_property_read_u32_array(np, "max8952,dvs-mode-microvolt",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 					pd->dvs_mode, ARRAY_SIZE(pd->dvs_mode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		dev_err(dev, "max8952,dvs-mode-microvolt property not specified");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	for (i = 0; i < ARRAY_SIZE(pd->dvs_mode); ++i) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		if (pd->dvs_mode[i] < 770000 || pd->dvs_mode[i] > 1400000) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			dev_err(dev, "DVS voltage %d out of range\n", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		pd->dvs_mode[i] = (pd->dvs_mode[i] - 770000) / 10000;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	if (of_property_read_u32(np, "max8952,sync-freq", &pd->sync_freq))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		dev_warn(dev, "max8952,sync-freq property not specified, defaulting to 26MHz\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	if (of_property_read_u32(np, "max8952,ramp-speed", &pd->ramp_speed))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		dev_warn(dev, "max8952,ramp-speed property not specified, defaulting to 32mV/us\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	pd->reg_data = of_get_regulator_init_data(dev, np, &regulator);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	if (!pd->reg_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		dev_err(dev, "Failed to parse regulator init data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	return pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static struct max8952_platform_data *max8952_parse_dt(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static int max8952_pmic_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		const struct i2c_device_id *i2c_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	struct i2c_adapter *adapter = client->adapter;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	struct max8952_platform_data *pdata = dev_get_platdata(&client->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	struct regulator_config config = { };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	struct max8952_data *max8952;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	struct regulator_dev *rdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	struct gpio_desc *gpiod;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	enum gpiod_flags gflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	if (client->dev.of_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		pdata = max8952_parse_dt(&client->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	if (!pdata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		dev_err(&client->dev, "Require the platform data\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	max8952 = devm_kzalloc(&client->dev, sizeof(struct max8952_data),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			       GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	if (!max8952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	max8952->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	max8952->pdata = pdata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	config.dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	config.init_data = pdata->reg_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	config.driver_data = max8952;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	config.of_node = client->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (pdata->reg_data->constraints.boot_on)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		gflags = GPIOD_OUT_HIGH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		gflags = GPIOD_OUT_LOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	 * Do not use devm* here: the regulator core takes over the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	 * lifecycle management of the GPIO descriptor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	gpiod = gpiod_get_optional(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 				   "max8952,en",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 				   gflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	if (IS_ERR(gpiod))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		return PTR_ERR(gpiod);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	if (gpiod)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		config.ena_gpiod = gpiod;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	rdev = devm_regulator_register(&client->dev, &regulator, &config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	if (IS_ERR(rdev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		ret = PTR_ERR(rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		dev_err(&client->dev, "regulator init failed (%d)\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	max8952->vid0 = pdata->default_mode & 0x1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	max8952->vid1 = (pdata->default_mode >> 1) & 0x1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	/* Fetch vid0 and vid1 GPIOs if available */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	gflags = max8952->vid0 ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	max8952->vid0_gpiod = devm_gpiod_get_index_optional(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 							    "max8952,vid",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 							    0, gflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	if (IS_ERR(max8952->vid0_gpiod))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		return PTR_ERR(max8952->vid0_gpiod);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	gflags = max8952->vid1 ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	max8952->vid1_gpiod = devm_gpiod_get_index_optional(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 							    "max8952,vid",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 							    1, gflags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	if (IS_ERR(max8952->vid1_gpiod))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 		return PTR_ERR(max8952->vid1_gpiod);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	/* If either VID GPIO is missing just disable this */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	if (!max8952->vid0_gpiod || !max8952->vid1_gpiod) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		dev_warn(&client->dev, "VID0/1 gpio invalid: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 			 "DVS not available.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		max8952->vid0 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		max8952->vid1 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		/* Make sure if we have any descriptors they get set to low */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		if (max8952->vid0_gpiod)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			gpiod_set_value(max8952->vid0_gpiod, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		if (max8952->vid1_gpiod)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 			gpiod_set_value(max8952->vid1_gpiod, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		/* Disable Pulldown of EN only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x60);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		dev_err(&client->dev, "DVS modes disabled because VID0 and VID1"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 				" do not have proper controls.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 		 * Disable Pulldown on EN, VID0, VID1 to reduce
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 		 * leakage current of MAX8952 assuming that MAX8952
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		 * is turned on (EN==1). Note that without having VID0/1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		 * properly connected, turning pulldown off can be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		 * problematic. Thus, turn this off only when they are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		 * controllable by GPIO.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	max8952_write_reg(max8952, MAX8952_REG_MODE0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 			(max8952_read_reg(max8952,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 					  MAX8952_REG_MODE0) & 0xC0) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 			(pdata->dvs_mode[0] & 0x3F));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	max8952_write_reg(max8952, MAX8952_REG_MODE1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			(max8952_read_reg(max8952,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 					  MAX8952_REG_MODE1) & 0xC0) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 			(pdata->dvs_mode[1] & 0x3F));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	max8952_write_reg(max8952, MAX8952_REG_MODE2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 			(max8952_read_reg(max8952,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 					  MAX8952_REG_MODE2) & 0xC0) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 			(pdata->dvs_mode[2] & 0x3F));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	max8952_write_reg(max8952, MAX8952_REG_MODE3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 			(max8952_read_reg(max8952,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 					  MAX8952_REG_MODE3) & 0xC0) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 			(pdata->dvs_mode[3] & 0x3F));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	max8952_write_reg(max8952, MAX8952_REG_SYNC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			(max8952_read_reg(max8952, MAX8952_REG_SYNC) & 0x3F) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 			((pdata->sync_freq & 0x3) << 6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	max8952_write_reg(max8952, MAX8952_REG_RAMP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			(max8952_read_reg(max8952, MAX8952_REG_RAMP) & 0x1F) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			((pdata->ramp_speed & 0x7) << 5));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	i2c_set_clientdata(client, max8952);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) static const struct i2c_device_id max8952_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	{ "max8952", 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	{ },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) MODULE_DEVICE_TABLE(i2c, max8952_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) static struct i2c_driver max8952_pmic_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	.probe		= max8952_pmic_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	.driver		= {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		.name	= "max8952",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		.of_match_table = of_match_ptr(max8952_dt_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	.id_table	= max8952_ids,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) static int __init max8952_pmic_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	return i2c_add_driver(&max8952_pmic_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) subsys_initcall(max8952_pmic_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) static void __exit max8952_pmic_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	i2c_del_driver(&max8952_pmic_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) module_exit(max8952_pmic_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) MODULE_DESCRIPTION("MAXIM 8952 voltage regulator driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) MODULE_LICENSE("GPL");