![Richard Fitzgerald](/assets/img/avatar_default.png)
This adds a new driver identity "madera-ldo1" and probe function so that this driver can be used to control the LDO1 regulator on some Cirrus Logic Madera codecs. Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com> Signed-off-by: Mark Brown <broonie@kernel.org>
419 lines
9.9 KiB
C
419 lines
9.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// arizona-ldo1.c -- LDO1 supply for Arizona devices
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//
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// Copyright 2012 Wolfson Microelectronics PLC.
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//
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// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/bitops.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/gpio/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/machine.h>
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#include <linux/regulator/of_regulator.h>
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#include <linux/slab.h>
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#include <linux/regulator/arizona-ldo1.h>
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#include <linux/mfd/arizona/core.h>
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#include <linux/mfd/arizona/pdata.h>
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#include <linux/mfd/arizona/registers.h>
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#include <linux/mfd/madera/core.h>
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#include <linux/mfd/madera/pdata.h>
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#include <linux/mfd/madera/registers.h>
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struct arizona_ldo1 {
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struct regulator_dev *regulator;
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struct regmap *regmap;
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struct regulator_consumer_supply supply;
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struct regulator_init_data init_data;
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struct gpio_desc *ena_gpiod;
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};
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static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
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unsigned sel)
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{
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struct regmap *regmap = rdev_get_regmap(rdev);
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unsigned int val;
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int ret;
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if (sel == rdev->desc->n_voltages - 1)
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val = ARIZONA_LDO1_HI_PWR;
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else
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val = 0;
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ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
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ARIZONA_LDO1_HI_PWR, val);
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if (ret != 0)
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return ret;
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if (val)
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return 0;
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return regulator_set_voltage_sel_regmap(rdev, sel);
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}
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static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
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{
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struct regmap *regmap = rdev_get_regmap(rdev);
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unsigned int val;
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int ret;
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ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
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if (ret != 0)
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return ret;
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if (val & ARIZONA_LDO1_HI_PWR)
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return rdev->desc->n_voltages - 1;
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return regulator_get_voltage_sel_regmap(rdev);
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}
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static const struct regulator_ops arizona_ldo1_hc_ops = {
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.list_voltage = regulator_list_voltage_linear_range,
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.map_voltage = regulator_map_voltage_linear_range,
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.get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
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.set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
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.get_bypass = regulator_get_bypass_regmap,
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.set_bypass = regulator_set_bypass_regmap,
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};
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static const struct regulator_linear_range arizona_ldo1_hc_ranges[] = {
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REGULATOR_LINEAR_RANGE(900000, 0, 0x6, 50000),
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REGULATOR_LINEAR_RANGE(1800000, 0x7, 0x7, 0),
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};
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static const struct regulator_desc arizona_ldo1_hc = {
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.name = "LDO1",
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.supply_name = "LDOVDD",
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.type = REGULATOR_VOLTAGE,
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.ops = &arizona_ldo1_hc_ops,
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.vsel_reg = ARIZONA_LDO1_CONTROL_1,
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.vsel_mask = ARIZONA_LDO1_VSEL_MASK,
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.bypass_reg = ARIZONA_LDO1_CONTROL_1,
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.bypass_mask = ARIZONA_LDO1_BYPASS,
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.linear_ranges = arizona_ldo1_hc_ranges,
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.n_linear_ranges = ARRAY_SIZE(arizona_ldo1_hc_ranges),
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.n_voltages = 8,
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.enable_time = 1500,
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.ramp_delay = 24000,
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.owner = THIS_MODULE,
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};
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static const struct regulator_ops arizona_ldo1_ops = {
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.list_voltage = regulator_list_voltage_linear,
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.map_voltage = regulator_map_voltage_linear,
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.get_voltage_sel = regulator_get_voltage_sel_regmap,
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.set_voltage_sel = regulator_set_voltage_sel_regmap,
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};
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static const struct regulator_desc arizona_ldo1 = {
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.name = "LDO1",
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.supply_name = "LDOVDD",
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.type = REGULATOR_VOLTAGE,
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.ops = &arizona_ldo1_ops,
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.vsel_reg = ARIZONA_LDO1_CONTROL_1,
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.vsel_mask = ARIZONA_LDO1_VSEL_MASK,
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.min_uV = 900000,
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.uV_step = 25000,
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.n_voltages = 13,
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.enable_time = 500,
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.ramp_delay = 24000,
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.owner = THIS_MODULE,
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};
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static const struct regulator_init_data arizona_ldo1_dvfs = {
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.constraints = {
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.min_uV = 1200000,
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.max_uV = 1800000,
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.valid_ops_mask = REGULATOR_CHANGE_STATUS |
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REGULATOR_CHANGE_VOLTAGE,
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},
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.num_consumer_supplies = 1,
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};
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static const struct regulator_init_data arizona_ldo1_default = {
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.constraints = {
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.valid_ops_mask = REGULATOR_CHANGE_STATUS,
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},
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.num_consumer_supplies = 1,
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};
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static const struct regulator_init_data arizona_ldo1_wm5110 = {
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.constraints = {
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.min_uV = 1175000,
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.max_uV = 1200000,
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.valid_ops_mask = REGULATOR_CHANGE_STATUS |
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REGULATOR_CHANGE_VOLTAGE,
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},
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.num_consumer_supplies = 1,
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};
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static const struct regulator_desc madera_ldo1 = {
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.name = "LDO1",
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.supply_name = "LDOVDD",
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.type = REGULATOR_VOLTAGE,
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.ops = &arizona_ldo1_ops,
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.vsel_reg = MADERA_LDO1_CONTROL_1,
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.vsel_mask = MADERA_LDO1_VSEL_MASK,
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.min_uV = 900000,
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.uV_step = 25000,
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.n_voltages = 13,
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.enable_time = 3000,
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.owner = THIS_MODULE,
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};
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static const struct regulator_init_data madera_ldo1_default = {
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.constraints = {
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.min_uV = 1200000,
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.max_uV = 1200000,
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.valid_ops_mask = REGULATOR_CHANGE_STATUS,
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},
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.num_consumer_supplies = 1,
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};
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static int arizona_ldo1_of_get_pdata(struct arizona_ldo1_pdata *pdata,
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struct regulator_config *config,
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const struct regulator_desc *desc,
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bool *external_dcvdd)
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{
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struct arizona_ldo1 *ldo1 = config->driver_data;
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struct device_node *np = config->dev->of_node;
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struct device_node *init_node, *dcvdd_node;
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struct regulator_init_data *init_data;
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init_node = of_get_child_by_name(np, "ldo1");
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dcvdd_node = of_parse_phandle(np, "DCVDD-supply", 0);
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if (init_node) {
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config->of_node = init_node;
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init_data = of_get_regulator_init_data(config->dev, init_node,
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desc);
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if (init_data) {
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init_data->consumer_supplies = &ldo1->supply;
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init_data->num_consumer_supplies = 1;
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if (dcvdd_node && dcvdd_node != init_node)
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*external_dcvdd = true;
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pdata->init_data = init_data;
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}
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} else if (dcvdd_node) {
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*external_dcvdd = true;
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}
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of_node_put(dcvdd_node);
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return 0;
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}
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static int arizona_ldo1_common_init(struct platform_device *pdev,
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struct arizona_ldo1 *ldo1,
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const struct regulator_desc *desc,
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struct arizona_ldo1_pdata *pdata,
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bool *external_dcvdd)
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{
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struct device *parent_dev = pdev->dev.parent;
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struct regulator_config config = { };
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int ret;
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*external_dcvdd = false;
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ldo1->supply.supply = "DCVDD";
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ldo1->init_data.consumer_supplies = &ldo1->supply;
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ldo1->supply.dev_name = dev_name(parent_dev);
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config.dev = parent_dev;
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config.driver_data = ldo1;
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config.regmap = ldo1->regmap;
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if (IS_ENABLED(CONFIG_OF)) {
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if (!dev_get_platdata(parent_dev)) {
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ret = arizona_ldo1_of_get_pdata(pdata,
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&config, desc,
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external_dcvdd);
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if (ret < 0)
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return ret;
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}
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}
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/* We assume that high output = regulator off
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* Don't use devm, since we need to get against the parent device
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* so clean up would happen at the wrong time
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*/
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config.ena_gpiod = gpiod_get_optional(parent_dev, "wlf,ldoena",
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GPIOD_OUT_LOW | GPIOD_FLAGS_BIT_NONEXCLUSIVE);
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if (IS_ERR(config.ena_gpiod))
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return PTR_ERR(config.ena_gpiod);
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ldo1->ena_gpiod = config.ena_gpiod;
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if (pdata->init_data)
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config.init_data = pdata->init_data;
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else
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config.init_data = &ldo1->init_data;
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/*
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* LDO1 can only be used to supply DCVDD so if it has no
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* consumers then DCVDD is supplied externally.
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*/
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if (config.init_data->num_consumer_supplies == 0)
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*external_dcvdd = true;
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ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
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of_node_put(config.of_node);
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if (IS_ERR(ldo1->regulator)) {
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ret = PTR_ERR(ldo1->regulator);
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dev_err(&pdev->dev, "Failed to register LDO1 supply: %d\n",
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ret);
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return ret;
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}
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platform_set_drvdata(pdev, ldo1);
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return 0;
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}
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static int arizona_ldo1_probe(struct platform_device *pdev)
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{
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struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
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struct arizona_ldo1 *ldo1;
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const struct regulator_desc *desc;
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bool external_dcvdd;
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int ret;
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ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
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if (!ldo1)
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return -ENOMEM;
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ldo1->regmap = arizona->regmap;
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/*
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* Since the chip usually supplies itself we provide some
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* default init_data for it. This will be overridden with
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* platform data if provided.
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*/
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switch (arizona->type) {
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case WM5102:
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case WM8997:
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case WM8998:
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case WM1814:
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desc = &arizona_ldo1_hc;
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ldo1->init_data = arizona_ldo1_dvfs;
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break;
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case WM5110:
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case WM8280:
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desc = &arizona_ldo1;
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ldo1->init_data = arizona_ldo1_wm5110;
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break;
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default:
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desc = &arizona_ldo1;
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ldo1->init_data = arizona_ldo1_default;
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break;
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}
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ret = arizona_ldo1_common_init(pdev, ldo1, desc,
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&arizona->pdata.ldo1,
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&external_dcvdd);
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if (ret == 0)
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arizona->external_dcvdd = external_dcvdd;
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return ret;
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}
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static int arizona_ldo1_remove(struct platform_device *pdev)
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{
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struct arizona_ldo1 *ldo1 = platform_get_drvdata(pdev);
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if (ldo1->ena_gpiod)
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gpiod_put(ldo1->ena_gpiod);
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return 0;
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}
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static int madera_ldo1_probe(struct platform_device *pdev)
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{
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struct madera *madera = dev_get_drvdata(pdev->dev.parent);
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struct arizona_ldo1 *ldo1;
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bool external_dcvdd;
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int ret;
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ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
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if (!ldo1)
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return -ENOMEM;
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ldo1->regmap = madera->regmap;
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ldo1->init_data = madera_ldo1_default;
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ret = arizona_ldo1_common_init(pdev, ldo1, &madera_ldo1,
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&madera->pdata.ldo1,
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&external_dcvdd);
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if (ret)
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return ret;
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madera->internal_dcvdd = !external_dcvdd;
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return 0;
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}
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static struct platform_driver arizona_ldo1_driver = {
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.probe = arizona_ldo1_probe,
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.remove = arizona_ldo1_remove,
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.driver = {
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.name = "arizona-ldo1",
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},
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};
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static struct platform_driver madera_ldo1_driver = {
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.probe = madera_ldo1_probe,
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.remove = arizona_ldo1_remove,
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.driver = {
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.name = "madera-ldo1",
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},
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};
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static struct platform_driver * const madera_ldo1_drivers[] = {
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&arizona_ldo1_driver,
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&madera_ldo1_driver,
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};
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static int __init arizona_ldo1_init(void)
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{
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return platform_register_drivers(madera_ldo1_drivers,
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ARRAY_SIZE(madera_ldo1_drivers));
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}
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module_init(arizona_ldo1_init);
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static void __exit madera_ldo1_exit(void)
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{
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platform_unregister_drivers(madera_ldo1_drivers,
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ARRAY_SIZE(madera_ldo1_drivers));
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}
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module_exit(madera_ldo1_exit);
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/* Module information */
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("Arizona LDO1 driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:arizona-ldo1");
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MODULE_ALIAS("platform:madera-ldo1");
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