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92d96b6037
As per Table 130 of the wm8994 datasheet at [1], there is an off-on delay for LDO1 and LDO2. In the wm8958 datasheet [2], I could not find any reference to it. I could not find a wm1811 datasheet to double-check there, but as no one has complained presumably it works without it. This solves the issue on Samsung Aries boards with a wm8994 where register writes fail when the device is powered off and back-on quickly. [1] https://statics.cirrus.com/pubs/proDatasheet/WM8994_Rev4.6.pdf [2] https://statics.cirrus.com/pubs/proDatasheet/WM8958_v3.5.pdf Signed-off-by: Jonathan Bakker <xc-racer2@live.ca> Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com> Link: https://lore.kernel.org/r/CY4PR04MB056771CFB80DC447C30D5A31CB1D9@CY4PR04MB0567.namprd04.prod.outlook.com Signed-off-by: Mark Brown <broonie@kernel.org>
240 lines
5.8 KiB
C
240 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// wm8994-regulator.c -- Regulator driver for the WM8994
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//
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// Copyright 2009 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/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/gpio/consumer.h>
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#include <linux/slab.h>
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#include <linux/mfd/wm8994/core.h>
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#include <linux/mfd/wm8994/registers.h>
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#include <linux/mfd/wm8994/pdata.h>
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struct wm8994_ldo {
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struct regulator_dev *regulator;
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struct wm8994 *wm8994;
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struct regulator_consumer_supply supply;
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struct regulator_init_data init_data;
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};
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#define WM8994_LDO1_MAX_SELECTOR 0x7
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#define WM8994_LDO2_MAX_SELECTOR 0x3
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static const struct regulator_ops wm8994_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 int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
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unsigned int selector)
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{
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struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
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if (selector > WM8994_LDO2_MAX_SELECTOR)
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return -EINVAL;
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switch (ldo->wm8994->type) {
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case WM8994:
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return (selector * 100000) + 900000;
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case WM8958:
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return (selector * 100000) + 1000000;
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case WM1811:
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switch (selector) {
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case 0:
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return -EINVAL;
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default:
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return (selector * 100000) + 950000;
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}
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break;
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default:
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return -EINVAL;
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}
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}
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static const struct regulator_ops wm8994_ldo2_ops = {
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.list_voltage = wm8994_ldo2_list_voltage,
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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 wm8994_ldo_desc[] = {
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{
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.name = "LDO1",
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.id = 1,
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.type = REGULATOR_VOLTAGE,
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.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
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.vsel_reg = WM8994_LDO_1,
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.vsel_mask = WM8994_LDO1_VSEL_MASK,
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.ops = &wm8994_ldo1_ops,
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.min_uV = 2400000,
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.uV_step = 100000,
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.enable_time = 3000,
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.off_on_delay = 36000,
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.owner = THIS_MODULE,
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},
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{
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.name = "LDO2",
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.id = 2,
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.type = REGULATOR_VOLTAGE,
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.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
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.vsel_reg = WM8994_LDO_2,
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.vsel_mask = WM8994_LDO2_VSEL_MASK,
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.ops = &wm8994_ldo2_ops,
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.enable_time = 3000,
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.off_on_delay = 36000,
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.owner = THIS_MODULE,
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},
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};
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static const struct regulator_desc wm8958_ldo_desc[] = {
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{
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.name = "LDO1",
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.id = 1,
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.type = REGULATOR_VOLTAGE,
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.n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
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.vsel_reg = WM8994_LDO_1,
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.vsel_mask = WM8994_LDO1_VSEL_MASK,
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.ops = &wm8994_ldo1_ops,
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.min_uV = 2400000,
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.uV_step = 100000,
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.enable_time = 3000,
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.owner = THIS_MODULE,
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},
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{
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.name = "LDO2",
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.id = 2,
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.type = REGULATOR_VOLTAGE,
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.n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
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.vsel_reg = WM8994_LDO_2,
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.vsel_mask = WM8994_LDO2_VSEL_MASK,
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.ops = &wm8994_ldo2_ops,
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.enable_time = 3000,
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.owner = THIS_MODULE,
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},
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};
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static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
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{ .supply = "AVDD1" },
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{ .supply = "DCVDD" },
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};
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static const struct regulator_init_data wm8994_ldo_default[] = {
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{
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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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{
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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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};
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static int wm8994_ldo_probe(struct platform_device *pdev)
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{
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struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
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struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
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int id = pdev->id % ARRAY_SIZE(pdata->ldo);
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struct regulator_config config = { };
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struct wm8994_ldo *ldo;
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struct gpio_desc *gpiod;
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int ret;
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dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
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ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
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if (!ldo)
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return -ENOMEM;
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ldo->wm8994 = wm8994;
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ldo->supply = wm8994_ldo_consumer[id];
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ldo->supply.dev_name = dev_name(wm8994->dev);
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config.dev = wm8994->dev;
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config.driver_data = ldo;
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config.regmap = wm8994->regmap;
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config.init_data = &ldo->init_data;
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/*
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* Look up LDO enable GPIO from the parent device node, we don't
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* use devm because the regulator core will free the GPIO
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*/
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gpiod = gpiod_get_optional(pdev->dev.parent,
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id ? "wlf,ldo2ena" : "wlf,ldo1ena",
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GPIOD_OUT_LOW |
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GPIOD_FLAGS_BIT_NONEXCLUSIVE);
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if (IS_ERR(gpiod))
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return PTR_ERR(gpiod);
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config.ena_gpiod = gpiod;
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/* Use default constraints if none set up */
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if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
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dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
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ldo->supply.dev_name, ldo->supply.supply);
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ldo->init_data = wm8994_ldo_default[id];
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ldo->init_data.consumer_supplies = &ldo->supply;
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if (!gpiod)
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ldo->init_data.constraints.valid_ops_mask = 0;
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} else {
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ldo->init_data = *pdata->ldo[id].init_data;
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}
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/*
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* At this point the GPIO descriptor is handled over to the
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* regulator core and we need not worry about it on the
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* error path.
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*/
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if (ldo->wm8994->type == WM8994) {
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ldo->regulator = devm_regulator_register(&pdev->dev,
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&wm8994_ldo_desc[id],
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&config);
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} else {
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ldo->regulator = devm_regulator_register(&pdev->dev,
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&wm8958_ldo_desc[id],
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&config);
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}
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if (IS_ERR(ldo->regulator)) {
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ret = PTR_ERR(ldo->regulator);
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dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
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id + 1, ret);
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return ret;
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}
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platform_set_drvdata(pdev, ldo);
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return 0;
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}
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static struct platform_driver wm8994_ldo_driver = {
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.probe = wm8994_ldo_probe,
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.driver = {
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.name = "wm8994-ldo",
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},
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};
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module_platform_driver(wm8994_ldo_driver);
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/* Module information */
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("WM8994 LDO driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm8994-ldo");
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