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- // SPDX-License-Identifier: GPL-2.0
- // Copyright (C) 2020 ROHM Semiconductors
- // ROHM BD9576MUF/BD9573MUF regulator driver
- #include <linux/delay.h>
- #include <linux/err.h>
- #include <linux/gpio/consumer.h>
- #include <linux/interrupt.h>
- #include <linux/kernel.h>
- #include <linux/mfd/rohm-bd957x.h>
- #include <linux/mfd/rohm-generic.h>
- #include <linux/module.h>
- #include <linux/of.h>
- #include <linux/platform_device.h>
- #include <linux/regulator/driver.h>
- #include <linux/regulator/machine.h>
- #include <linux/regulator/of_regulator.h>
- #include <linux/slab.h>
- #define BD957X_VOUTS1_VOLT 3300000
- #define BD957X_VOUTS4_BASE_VOLT 1030000
- #define BD957X_VOUTS34_NUM_VOLT 32
- static int vout1_volt_table[] = {5000000, 4900000, 4800000, 4700000, 4600000,
- 4500000, 4500000, 4500000, 5000000, 5100000,
- 5200000, 5300000, 5400000, 5500000, 5500000,
- 5500000};
- static int vout2_volt_table[] = {1800000, 1780000, 1760000, 1740000, 1720000,
- 1700000, 1680000, 1660000, 1800000, 1820000,
- 1840000, 1860000, 1880000, 1900000, 1920000,
- 1940000};
- static int voutl1_volt_table[] = {2500000, 2540000, 2580000, 2620000, 2660000,
- 2700000, 2740000, 2780000, 2500000, 2460000,
- 2420000, 2380000, 2340000, 2300000, 2260000,
- 2220000};
- struct bd957x_regulator_data {
- struct regulator_desc desc;
- int base_voltage;
- };
- static int bd957x_vout34_list_voltage(struct regulator_dev *rdev,
- unsigned int selector)
- {
- const struct regulator_desc *desc = rdev->desc;
- int multiplier = selector & desc->vsel_mask & 0x7f;
- int tune;
- /* VOUT3 and 4 has 10mV step */
- tune = multiplier * 10000;
- if (!(selector & 0x80))
- return desc->fixed_uV - tune;
- return desc->fixed_uV + tune;
- }
- static int bd957x_list_voltage(struct regulator_dev *rdev,
- unsigned int selector)
- {
- const struct regulator_desc *desc = rdev->desc;
- int index = selector & desc->vsel_mask & 0x7f;
- if (!(selector & 0x80))
- index += desc->n_voltages/2;
- if (index >= desc->n_voltages)
- return -EINVAL;
- return desc->volt_table[index];
- }
- static const struct regulator_ops bd957x_vout34_ops = {
- .is_enabled = regulator_is_enabled_regmap,
- .list_voltage = bd957x_vout34_list_voltage,
- .get_voltage_sel = regulator_get_voltage_sel_regmap,
- };
- static const struct regulator_ops bd957X_vouts1_regulator_ops = {
- .is_enabled = regulator_is_enabled_regmap,
- };
- static const struct regulator_ops bd957x_ops = {
- .is_enabled = regulator_is_enabled_regmap,
- .list_voltage = bd957x_list_voltage,
- .get_voltage_sel = regulator_get_voltage_sel_regmap,
- };
- static struct bd957x_regulator_data bd9576_regulators[] = {
- {
- .desc = {
- .name = "VD50",
- .of_match = of_match_ptr("regulator-vd50"),
- .regulators_node = of_match_ptr("regulators"),
- .id = BD957X_VD50,
- .type = REGULATOR_VOLTAGE,
- .ops = &bd957x_ops,
- .volt_table = &vout1_volt_table[0],
- .n_voltages = ARRAY_SIZE(vout1_volt_table),
- .vsel_reg = BD957X_REG_VOUT1_TUNE,
- .vsel_mask = BD957X_MASK_VOUT1_TUNE,
- .enable_reg = BD957X_REG_POW_TRIGGER1,
- .enable_mask = BD957X_REGULATOR_EN_MASK,
- .enable_val = BD957X_REGULATOR_DIS_VAL,
- .enable_is_inverted = true,
- .owner = THIS_MODULE,
- },
- },
- {
- .desc = {
- .name = "VD18",
- .of_match = of_match_ptr("regulator-vd18"),
- .regulators_node = of_match_ptr("regulators"),
- .id = BD957X_VD18,
- .type = REGULATOR_VOLTAGE,
- .ops = &bd957x_ops,
- .volt_table = &vout2_volt_table[0],
- .n_voltages = ARRAY_SIZE(vout2_volt_table),
- .vsel_reg = BD957X_REG_VOUT2_TUNE,
- .vsel_mask = BD957X_MASK_VOUT2_TUNE,
- .enable_reg = BD957X_REG_POW_TRIGGER2,
- .enable_mask = BD957X_REGULATOR_EN_MASK,
- .enable_val = BD957X_REGULATOR_DIS_VAL,
- .enable_is_inverted = true,
- .owner = THIS_MODULE,
- },
- },
- {
- .desc = {
- .name = "VDDDR",
- .of_match = of_match_ptr("regulator-vdddr"),
- .regulators_node = of_match_ptr("regulators"),
- .id = BD957X_VDDDR,
- .ops = &bd957x_vout34_ops,
- .type = REGULATOR_VOLTAGE,
- .n_voltages = BD957X_VOUTS34_NUM_VOLT,
- .vsel_reg = BD957X_REG_VOUT3_TUNE,
- .vsel_mask = BD957X_MASK_VOUT3_TUNE,
- .enable_reg = BD957X_REG_POW_TRIGGER3,
- .enable_mask = BD957X_REGULATOR_EN_MASK,
- .enable_val = BD957X_REGULATOR_DIS_VAL,
- .enable_is_inverted = true,
- .owner = THIS_MODULE,
- },
- },
- {
- .desc = {
- .name = "VD10",
- .of_match = of_match_ptr("regulator-vd10"),
- .regulators_node = of_match_ptr("regulators"),
- .id = BD957X_VD10,
- .ops = &bd957x_vout34_ops,
- .type = REGULATOR_VOLTAGE,
- .fixed_uV = BD957X_VOUTS4_BASE_VOLT,
- .n_voltages = BD957X_VOUTS34_NUM_VOLT,
- .vsel_reg = BD957X_REG_VOUT4_TUNE,
- .vsel_mask = BD957X_MASK_VOUT4_TUNE,
- .enable_reg = BD957X_REG_POW_TRIGGER4,
- .enable_mask = BD957X_REGULATOR_EN_MASK,
- .enable_val = BD957X_REGULATOR_DIS_VAL,
- .enable_is_inverted = true,
- .owner = THIS_MODULE,
- },
- },
- {
- .desc = {
- .name = "VOUTL1",
- .of_match = of_match_ptr("regulator-voutl1"),
- .regulators_node = of_match_ptr("regulators"),
- .id = BD957X_VOUTL1,
- .ops = &bd957x_ops,
- .type = REGULATOR_VOLTAGE,
- .volt_table = &voutl1_volt_table[0],
- .n_voltages = ARRAY_SIZE(voutl1_volt_table),
- .vsel_reg = BD957X_REG_VOUTL1_TUNE,
- .vsel_mask = BD957X_MASK_VOUTL1_TUNE,
- .enable_reg = BD957X_REG_POW_TRIGGERL1,
- .enable_mask = BD957X_REGULATOR_EN_MASK,
- .enable_val = BD957X_REGULATOR_DIS_VAL,
- .enable_is_inverted = true,
- .owner = THIS_MODULE,
- },
- },
- {
- .desc = {
- .name = "VOUTS1",
- .of_match = of_match_ptr("regulator-vouts1"),
- .regulators_node = of_match_ptr("regulators"),
- .id = BD957X_VOUTS1,
- .ops = &bd957X_vouts1_regulator_ops,
- .type = REGULATOR_VOLTAGE,
- .n_voltages = 1,
- .fixed_uV = BD957X_VOUTS1_VOLT,
- .enable_reg = BD957X_REG_POW_TRIGGERS1,
- .enable_mask = BD957X_REGULATOR_EN_MASK,
- .enable_val = BD957X_REGULATOR_DIS_VAL,
- .enable_is_inverted = true,
- .owner = THIS_MODULE,
- },
- },
- };
- static int bd957x_probe(struct platform_device *pdev)
- {
- struct regmap *regmap;
- struct regulator_config config = { 0 };
- int i;
- bool vout_mode, ddr_sel;
- const struct bd957x_regulator_data *reg_data = &bd9576_regulators[0];
- unsigned int num_reg_data = ARRAY_SIZE(bd9576_regulators);
- enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;
- regmap = dev_get_regmap(pdev->dev.parent, NULL);
- if (!regmap) {
- dev_err(&pdev->dev, "No regmap\n");
- return -EINVAL;
- }
- vout_mode = of_property_read_bool(pdev->dev.parent->of_node,
- "rohm,vout1-en-low");
- if (vout_mode) {
- struct gpio_desc *en;
- dev_dbg(&pdev->dev, "GPIO controlled mode\n");
- /* VOUT1 enable state judged by VOUT1_EN pin */
- /* See if we have GPIO defined */
- en = devm_gpiod_get_from_of_node(&pdev->dev,
- pdev->dev.parent->of_node,
- "rohm,vout1-en-gpios", 0,
- GPIOD_OUT_LOW, "vout1-en");
- if (!IS_ERR(en)) {
- /* VOUT1_OPS gpio ctrl */
- /*
- * Regulator core prioritizes the ena_gpio over
- * enable/disable/is_enabled callbacks so no need to
- * clear them. We can still use same ops
- */
- config.ena_gpiod = en;
- } else {
- /*
- * In theory it is possible someone wants to set
- * vout1-en LOW during OTP loading and set VOUT1 to be
- * controlled by GPIO - but control the GPIO from some
- * where else than this driver. For that to work we
- * should unset the is_enabled callback here.
- *
- * I believe such case where rohm,vout1-en-low is set
- * and vout1-en-gpios is not is likely to be a
- * misconfiguration. So let's just err out for now.
- */
- dev_err(&pdev->dev,
- "Failed to get VOUT1 control GPIO\n");
- return PTR_ERR(en);
- }
- }
- /*
- * If more than one PMIC needs to be controlled by same processor then
- * allocate the regulator data array here and use bd9576_regulators as
- * template. At the moment I see no such use-case so I spare some
- * bytes and use bd9576_regulators directly for non-constant configs
- * like DDR voltage selection.
- */
- ddr_sel = of_property_read_bool(pdev->dev.parent->of_node,
- "rohm,ddr-sel-low");
- if (ddr_sel)
- bd9576_regulators[2].desc.fixed_uV = 1350000;
- else
- bd9576_regulators[2].desc.fixed_uV = 1500000;
- switch (chip) {
- case ROHM_CHIP_TYPE_BD9576:
- dev_dbg(&pdev->dev, "Found BD9576MUF\n");
- break;
- case ROHM_CHIP_TYPE_BD9573:
- dev_dbg(&pdev->dev, "Found BD9573MUF\n");
- break;
- default:
- dev_err(&pdev->dev, "Unsupported chip type\n");
- return -EINVAL;
- }
- config.dev = pdev->dev.parent;
- config.regmap = regmap;
- for (i = 0; i < num_reg_data; i++) {
- const struct regulator_desc *desc;
- struct regulator_dev *rdev;
- const struct bd957x_regulator_data *r;
- r = ®_data[i];
- desc = &r->desc;
- rdev = devm_regulator_register(&pdev->dev, desc, &config);
- if (IS_ERR(rdev)) {
- dev_err(&pdev->dev,
- "failed to register %s regulator\n",
- desc->name);
- return PTR_ERR(rdev);
- }
- /*
- * Clear the VOUT1 GPIO setting - rest of the regulators do not
- * support GPIO control
- */
- config.ena_gpiod = NULL;
- }
- return 0;
- }
- static const struct platform_device_id bd957x_pmic_id[] = {
- { "bd9573-pmic", ROHM_CHIP_TYPE_BD9573 },
- { "bd9576-pmic", ROHM_CHIP_TYPE_BD9576 },
- { },
- };
- MODULE_DEVICE_TABLE(platform, bd957x_pmic_id);
- static struct platform_driver bd957x_regulator = {
- .driver = {
- .name = "bd957x-pmic",
- },
- .probe = bd957x_probe,
- .id_table = bd957x_pmic_id,
- };
- module_platform_driver(bd957x_regulator);
- MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
- MODULE_DESCRIPTION("ROHM BD9576/BD9573 voltage regulator driver");
- MODULE_LICENSE("GPL");
- MODULE_ALIAS("platform:bd957x-pmic");
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