295070e9aa
The regulator has never been properly enabled, it has been
dormant all the time. It's strange that MMC was working
at all, but it likely worked by the signals going through
the levelshifter and reaching the card anyways.
Fixes: 3615a34ea1 ("regulator: add STw481x VMMC driver")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*
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* Regulator driver for STw4810/STw4811 VMMC regulator.
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*
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* Copyright (C) 2013 ST-Ericsson SA
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* Written on behalf of Linaro for ST-Ericsson
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/mfd/stw481x.h>
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#include <linux/module.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/of_regulator.h>
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static const unsigned int stw481x_vmmc_voltages[] = {
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1800000,
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1800000,
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2850000,
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3000000,
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1850000,
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2600000,
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2700000,
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3300000,
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};
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static struct regulator_ops stw481x_vmmc_ops = {
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.list_voltage = regulator_list_voltage_table,
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.enable = regulator_enable_regmap,
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.disable = regulator_disable_regmap,
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.is_enabled = regulator_is_enabled_regmap,
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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 struct regulator_desc vmmc_regulator = {
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.name = "VMMC",
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.id = 0,
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.ops = &stw481x_vmmc_ops,
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.type = REGULATOR_VOLTAGE,
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.owner = THIS_MODULE,
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.n_voltages = ARRAY_SIZE(stw481x_vmmc_voltages),
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.volt_table = stw481x_vmmc_voltages,
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.enable_time = 200, /* FIXME: look this up */
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.enable_reg = STW_CONF1,
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.enable_mask = STW_CONF1_PDN_VMMC | STW_CONF1_MMC_LS_STATUS,
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.enable_val = STW_CONF1_PDN_VMMC,
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.vsel_reg = STW_CONF1,
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.vsel_mask = STW_CONF1_VMMC_MASK,
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};
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static int stw481x_vmmc_regulator_probe(struct platform_device *pdev)
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{
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struct stw481x *stw481x = dev_get_platdata(&pdev->dev);
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struct regulator_config config = { };
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struct regulator_dev *rdev;
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int ret;
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/* First disable the external VMMC if it's active */
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ret = regmap_update_bits(stw481x->map, STW_CONF2,
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STW_CONF2_VMMC_EXT, 0);
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if (ret) {
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dev_err(&pdev->dev, "could not disable external VMMC\n");
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return ret;
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}
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/* Register VMMC regulator */
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config.dev = &pdev->dev;
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config.driver_data = stw481x;
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config.regmap = stw481x->map;
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config.of_node = pdev->dev.of_node;
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config.init_data = of_get_regulator_init_data(&pdev->dev,
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pdev->dev.of_node,
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&vmmc_regulator);
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rdev = devm_regulator_register(&pdev->dev, &vmmc_regulator, &config);
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if (IS_ERR(rdev)) {
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dev_err(&pdev->dev,
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"error initializing STw481x VMMC regulator\n");
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return PTR_ERR(rdev);
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}
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dev_info(&pdev->dev, "initialized STw481x VMMC regulator\n");
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return 0;
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}
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static const struct of_device_id stw481x_vmmc_match[] = {
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{ .compatible = "st,stw481x-vmmc", },
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{},
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};
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static struct platform_driver stw481x_vmmc_regulator_driver = {
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.driver = {
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.name = "stw481x-vmmc-regulator",
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.of_match_table = stw481x_vmmc_match,
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},
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.probe = stw481x_vmmc_regulator_probe,
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};
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module_platform_driver(stw481x_vmmc_regulator_driver);
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