diff options
Diffstat (limited to 'drivers/regulator/ltc3589.c')
| -rw-r--r-- | drivers/regulator/ltc3589.c | 360 |
1 files changed, 128 insertions, 232 deletions
diff --git a/drivers/regulator/ltc3589.c b/drivers/regulator/ltc3589.c index 63f724f260ef..3f70c2225dba 100644 --- a/drivers/regulator/ltc3589.c +++ b/drivers/regulator/ltc3589.c @@ -1,28 +1,15 @@ -/* - * Linear Technology LTC3589,LTC3589-1 regulator support - * - * Copyright (c) 2014 Philipp Zabel <p.zabel@pengutronix.de>, Pengutronix - * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 - * as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - */ +// SPDX-License-Identifier: GPL-2.0 +// +// Linear Technology LTC3589,LTC3589-1 regulator support +// +// Copyright (c) 2014 Philipp Zabel <p.zabel@pengutronix.de>, Pengutronix + #include <linux/i2c.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/of.h> -#include <linux/of_device.h> #include <linux/regmap.h> #include <linux/regulator/driver.h> #include <linux/regulator/of_regulator.h> @@ -66,11 +53,10 @@ #define LTC3589_VCCR_SW3_GO BIT(4) #define LTC3589_VCCR_LDO2_GO BIT(6) -enum ltc3589_variant { - LTC3589, - LTC3589_1, - LTC3589_2, -}; +#define LTC3589_VRRCR_SW1_RAMP_MASK GENMASK(1, 0) +#define LTC3589_VRRCR_SW2_RAMP_MASK GENMASK(3, 2) +#define LTC3589_VRRCR_SW3_RAMP_MASK GENMASK(5, 4) +#define LTC3589_VRRCR_LDO2_RAMP_MASK GENMASK(7, 6) enum ltc3589_reg { LTC3589_SW1, @@ -84,19 +70,15 @@ enum ltc3589_reg { LTC3589_NUM_REGULATORS, }; -struct ltc3589_regulator { - struct regulator_desc desc; - - /* External feedback voltage divider */ - unsigned int r1; - unsigned int r2; +struct ltc3589_info { + const unsigned int *volt_table; + int fixed_uV; }; struct ltc3589 { struct regmap *regmap; struct device *dev; - enum ltc3589_variant variant; - struct ltc3589_regulator regulator_descs[LTC3589_NUM_REGULATORS]; + struct regulator_desc regulator_descs[LTC3589_NUM_REGULATORS]; struct regulator_dev *regulators[LTC3589_NUM_REGULATORS]; }; @@ -108,27 +90,9 @@ static const int ltc3589_12_ldo4[] = { 1200000, 1800000, 2500000, 3200000, }; -static int ltc3589_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay) -{ - struct ltc3589 *ltc3589 = rdev_get_drvdata(rdev); - int sel, shift; - - if (unlikely(ramp_delay <= 0)) - return -EINVAL; - - /* VRRCR slew rate offsets are the same as VCCR go bit offsets */ - shift = ffs(rdev->desc->apply_bit) - 1; - - /* The slew rate can be set to 0.88, 1.75, 3.5, or 7 mV/uS */ - for (sel = 0; sel < 4; sel++) { - if ((880 << sel) >= ramp_delay) { - return regmap_update_bits(ltc3589->regmap, - LTC3589_VRRCR, - 0x3 << shift, sel << shift); - } - } - return -EINVAL; -} +static const unsigned int ltc3589_ramp_table[] = { + 880, 1750, 3500, 7000 +}; static int ltc3589_set_suspend_voltage(struct regulator_dev *rdev, int uV) { @@ -169,7 +133,7 @@ static const struct regulator_ops ltc3589_linear_regulator_ops = { .list_voltage = regulator_list_voltage_linear, .set_voltage_sel = regulator_set_voltage_sel_regmap, .get_voltage_sel = regulator_get_voltage_sel_regmap, - .set_ramp_delay = ltc3589_set_ramp_delay, + .set_ramp_delay = regulator_set_ramp_delay_regmap, .set_voltage_time_sel = regulator_set_voltage_time_sel, .set_suspend_voltage = ltc3589_set_suspend_voltage, .set_suspend_mode = ltc3589_set_suspend_mode, @@ -196,131 +160,106 @@ static const struct regulator_ops ltc3589_table_regulator_ops = { .get_voltage_sel = regulator_get_voltage_sel_regmap, }; +static inline unsigned int ltc3589_scale(unsigned int uV, u32 r1, u32 r2) +{ + uint64_t tmp; -#define LTC3589_REG(_name, _ops, en_bit, dtv1_reg, dtv_mask, go_bit) \ - [LTC3589_ ## _name] = { \ - .desc = { \ - .name = #_name, \ - .n_voltages = (dtv_mask) + 1, \ - .min_uV = (go_bit) ? 362500 : 0, \ - .uV_step = (go_bit) ? 12500 : 0, \ - .ramp_delay = (go_bit) ? 1750 : 0, \ - .fixed_uV = (dtv_mask) ? 0 : 800000, \ - .ops = <c3589_ ## _ops ## _regulator_ops, \ - .type = REGULATOR_VOLTAGE, \ - .id = LTC3589_ ## _name, \ - .owner = THIS_MODULE, \ - .vsel_reg = (dtv1_reg), \ - .vsel_mask = (dtv_mask), \ - .apply_reg = (go_bit) ? LTC3589_VCCR : 0, \ - .apply_bit = (go_bit), \ - .enable_reg = (en_bit) ? LTC3589_OVEN : 0, \ - .enable_mask = (en_bit), \ - }, \ - } - -#define LTC3589_LINEAR_REG(_name, _dtv1) \ - LTC3589_REG(_name, linear, LTC3589_OVEN_ ## _name, \ - LTC3589_ ## _dtv1, 0x1f, \ - LTC3589_VCCR_ ## _name ## _GO) - -#define LTC3589_FIXED_REG(_name) \ - LTC3589_REG(_name, fixed, LTC3589_OVEN_ ## _name, 0, 0, 0) - -static struct ltc3589_regulator ltc3589_regulators[LTC3589_NUM_REGULATORS] = { - LTC3589_LINEAR_REG(SW1, B1DTV1), - LTC3589_LINEAR_REG(SW2, B2DTV1), - LTC3589_LINEAR_REG(SW3, B3DTV1), - LTC3589_FIXED_REG(BB_OUT), - LTC3589_REG(LDO1, fixed_standby, 0, 0, 0, 0), - LTC3589_LINEAR_REG(LDO2, L2DTV1), - LTC3589_FIXED_REG(LDO3), - LTC3589_REG(LDO4, table, LTC3589_OVEN_LDO4, LTC3589_L2DTV2, 0x60, 0), -}; + if (uV == 0) + return 0; -#ifdef CONFIG_OF -static struct of_regulator_match ltc3589_matches[LTC3589_NUM_REGULATORS] = { - { .name = "sw1", }, - { .name = "sw2", }, - { .name = "sw3", }, - { .name = "bb-out", }, - { .name = "ldo1", }, /* standby */ - { .name = "ldo2", }, - { .name = "ldo3", }, - { .name = "ldo4", }, -}; + tmp = (uint64_t)uV * r1; + do_div(tmp, r2); + return uV + (unsigned int)tmp; +} -static int ltc3589_parse_regulators_dt(struct ltc3589 *ltc3589) +static int ltc3589_of_parse_cb(struct device_node *np, + const struct regulator_desc *desc, + struct regulator_config *config) { - struct device *dev = ltc3589->dev; - struct device_node *node; - int i, ret; + struct ltc3589 *ltc3589 = config->driver_data; + struct regulator_desc *rdesc = <c3589->regulator_descs[desc->id]; + u32 r[2]; + int ret; - node = of_get_child_by_name(dev->of_node, "regulators"); - if (!node) { - dev_err(dev, "regulators node not found\n"); - return -EINVAL; - } + /* Parse feedback voltage dividers. LDO3 and LDO4 don't have them */ + if (desc->id >= LTC3589_LDO3) + return 0; - ret = of_regulator_match(dev, node, ltc3589_matches, - ARRAY_SIZE(ltc3589_matches)); - of_node_put(node); - if (ret < 0) { - dev_err(dev, "Error parsing regulator init data: %d\n", ret); - return ret; - } - if (ret != LTC3589_NUM_REGULATORS) { - dev_err(dev, "Only %d regulators described in device tree\n", + ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider", r, 2); + if (ret) { + dev_err(ltc3589->dev, "Failed to parse voltage divider: %d\n", ret); - return -EINVAL; + return ret; } - /* Parse feedback voltage dividers. LDO3 and LDO4 don't have them */ - for (i = 0; i < LTC3589_LDO3; i++) { - struct ltc3589_regulator *desc = <c3589->regulator_descs[i]; - struct device_node *np = ltc3589_matches[i].of_node; - u32 vdiv[2]; - - ret = of_property_read_u32_array(np, "lltc,fb-voltage-divider", - vdiv, 2); - if (ret) { - dev_err(dev, "Failed to parse voltage divider: %d\n", - ret); - return ret; - } + if (!r[0] || !r[1]) + return 0; - desc->r1 = vdiv[0]; - desc->r2 = vdiv[1]; - } + rdesc->min_uV = ltc3589_scale(desc->min_uV, r[0], r[1]); + rdesc->uV_step = ltc3589_scale(desc->uV_step, r[0], r[1]); + rdesc->fixed_uV = ltc3589_scale(desc->fixed_uV, r[0], r[1]); return 0; } -static inline struct regulator_init_data *match_init_data(int index) -{ - return ltc3589_matches[index].init_data; -} +#define LTC3589_REG(_name, _of_name, _ops, en_bit, dtv1_reg, dtv_mask) \ + [LTC3589_ ## _name] = { \ + .name = #_name, \ + .of_match = of_match_ptr(#_of_name), \ + .regulators_node = of_match_ptr("regulators"), \ + .of_parse_cb = ltc3589_of_parse_cb, \ + .n_voltages = (dtv_mask) + 1, \ + .fixed_uV = (dtv_mask) ? 0 : 800000, \ + .ops = <c3589_ ## _ops ## _regulator_ops, \ + .type = REGULATOR_VOLTAGE, \ + .id = LTC3589_ ## _name, \ + .owner = THIS_MODULE, \ + .vsel_reg = (dtv1_reg), \ + .vsel_mask = (dtv_mask), \ + .enable_reg = (en_bit) ? LTC3589_OVEN : 0, \ + .enable_mask = (en_bit), \ + } -static inline struct device_node *match_of_node(int index) -{ - return ltc3589_matches[index].of_node; -} -#else -static inline int ltc3589_parse_regulators_dt(struct ltc3589 *ltc3589) -{ - return 0; -} +#define LTC3589_LINEAR_REG(_name, _of_name, _dtv1) \ + [LTC3589_ ## _name] = { \ + .name = #_name, \ + .of_match = of_match_ptr(#_of_name), \ + .regulators_node = of_match_ptr("regulators"), \ + .of_parse_cb = ltc3589_of_parse_cb, \ + .n_voltages = 32, \ + .min_uV = 362500, \ + .uV_step = 12500, \ + .ramp_delay = 1750, \ + .ops = <c3589_linear_regulator_ops, \ + .type = REGULATOR_VOLTAGE, \ + .id = LTC3589_ ## _name, \ + .owner = THIS_MODULE, \ + .vsel_reg = LTC3589_ ## _dtv1, \ + .vsel_mask = 0x1f, \ + .apply_reg = LTC3589_VCCR, \ + .apply_bit = LTC3589_VCCR_ ## _name ## _GO, \ + .enable_reg = LTC3589_OVEN, \ + .enable_mask = (LTC3589_OVEN_ ## _name), \ + .ramp_reg = LTC3589_VRRCR, \ + .ramp_mask = LTC3589_VRRCR_ ## _name ## _RAMP_MASK, \ + .ramp_delay_table = ltc3589_ramp_table, \ + .n_ramp_values = ARRAY_SIZE(ltc3589_ramp_table), \ + } -static inline struct regulator_init_data *match_init_data(int index) -{ - return NULL; -} -static inline struct device_node *match_of_node(int index) -{ - return NULL; -} -#endif +#define LTC3589_FIXED_REG(_name, _of_name) \ + LTC3589_REG(_name, _of_name, fixed, LTC3589_OVEN_ ## _name, 0, 0) + +static const struct regulator_desc ltc3589_regulators[] = { + LTC3589_LINEAR_REG(SW1, sw1, B1DTV1), + LTC3589_LINEAR_REG(SW2, sw2, B2DTV1), + LTC3589_LINEAR_REG(SW3, sw3, B3DTV1), + LTC3589_FIXED_REG(BB_OUT, bb-out), + LTC3589_REG(LDO1, ldo1, fixed_standby, 0, 0, 0), + LTC3589_LINEAR_REG(LDO2, ldo2, L2DTV1), + LTC3589_FIXED_REG(LDO3, ldo3), + LTC3589_REG(LDO4, ldo4, table, LTC3589_OVEN_LDO4, LTC3589_L2DTV2, 0x60), +}; static bool ltc3589_writeable_reg(struct device *dev, unsigned int reg) { @@ -406,10 +345,9 @@ static const struct regmap_config ltc3589_regmap_config = { .num_reg_defaults = ARRAY_SIZE(ltc3589_reg_defaults), .use_single_read = true, .use_single_write = true, - .cache_type = REGCACHE_RBTREE, + .cache_type = REGCACHE_MAPLE, }; - static irqreturn_t ltc3589_isr(int irq, void *dev_id) { struct ltc3589 *ltc3589 = dev_id; @@ -437,33 +375,11 @@ static irqreturn_t ltc3589_isr(int irq, void *dev_id) return IRQ_HANDLED; } -static inline unsigned int ltc3589_scale(unsigned int uV, u32 r1, u32 r2) -{ - uint64_t tmp; - if (uV == 0) - return 0; - tmp = (uint64_t)uV * r1; - do_div(tmp, r2); - return uV + (unsigned int)tmp; -} - -static void ltc3589_apply_fb_voltage_divider(struct ltc3589_regulator *rdesc) -{ - struct regulator_desc *desc = &rdesc->desc; - - if (!rdesc->r1 || !rdesc->r2) - return; - - desc->min_uV = ltc3589_scale(desc->min_uV, rdesc->r1, rdesc->r2); - desc->uV_step = ltc3589_scale(desc->uV_step, rdesc->r1, rdesc->r2); - desc->fixed_uV = ltc3589_scale(desc->fixed_uV, rdesc->r1, rdesc->r2); -} - -static int ltc3589_probe(struct i2c_client *client, - const struct i2c_device_id *id) +static int ltc3589_probe(struct i2c_client *client) { struct device *dev = &client->dev; - struct ltc3589_regulator *descs; + const struct ltc3589_info *info; + struct regulator_desc *descs; struct ltc3589 *ltc3589; int i, ret; @@ -472,22 +388,13 @@ static int ltc3589_probe(struct i2c_client *client, return -ENOMEM; i2c_set_clientdata(client, ltc3589); - if (client->dev.of_node) - ltc3589->variant = (enum ltc3589_variant) - of_device_get_match_data(&client->dev); - else - ltc3589->variant = id->driver_data; + info = i2c_get_match_data(client); ltc3589->dev = dev; descs = ltc3589->regulator_descs; memcpy(descs, ltc3589_regulators, sizeof(ltc3589_regulators)); - if (ltc3589->variant == LTC3589) { - descs[LTC3589_LDO3].desc.fixed_uV = 1800000; - descs[LTC3589_LDO4].desc.volt_table = ltc3589_ldo4; - } else { - descs[LTC3589_LDO3].desc.fixed_uV = 2800000; - descs[LTC3589_LDO4].desc.volt_table = ltc3589_12_ldo4; - } + descs[LTC3589_LDO3].fixed_uV = info->fixed_uV; + descs[LTC3589_LDO4].volt_table = info->volt_table; ltc3589->regmap = devm_regmap_init_i2c(client, <c3589_regmap_config); if (IS_ERR(ltc3589->regmap)) { @@ -496,25 +403,12 @@ static int ltc3589_probe(struct i2c_client *client, return ret; } - ret = ltc3589_parse_regulators_dt(ltc3589); - if (ret) - return ret; - for (i = 0; i < LTC3589_NUM_REGULATORS; i++) { - struct ltc3589_regulator *rdesc = <c3589->regulator_descs[i]; - struct regulator_desc *desc = &rdesc->desc; - struct regulator_init_data *init_data; + struct regulator_desc *desc = <c3589->regulator_descs[i]; struct regulator_config config = { }; - init_data = match_init_data(i); - - if (i < LTC3589_LDO3) - ltc3589_apply_fb_voltage_divider(rdesc); - config.dev = dev; - config.init_data = init_data; config.driver_data = ltc3589; - config.of_node = match_of_node(i); ltc3589->regulators[i] = devm_regulator_register(dev, desc, &config); @@ -540,34 +434,36 @@ static int ltc3589_probe(struct i2c_client *client, return 0; } +static const struct ltc3589_info ltc3589_info = { + .fixed_uV = 1800000, + .volt_table = ltc3589_ldo4, +}; + +static const struct ltc3589_info ltc3589_12_info = { + .fixed_uV = 2800000, + .volt_table = ltc3589_12_ldo4, +}; + static const struct i2c_device_id ltc3589_i2c_id[] = { - { "ltc3589", LTC3589 }, - { "ltc3589-1", LTC3589_1 }, - { "ltc3589-2", LTC3589_2 }, + { "ltc3589", (kernel_ulong_t)<c3589_info }, + { "ltc3589-1", (kernel_ulong_t)<c3589_12_info }, + { "ltc3589-2", (kernel_ulong_t)<c3589_12_info }, { } }; MODULE_DEVICE_TABLE(i2c, ltc3589_i2c_id); -static const struct of_device_id ltc3589_of_match[] = { - { - .compatible = "lltc,ltc3589", - .data = (void *)LTC3589, - }, - { - .compatible = "lltc,ltc3589-1", - .data = (void *)LTC3589_1, - }, - { - .compatible = "lltc,ltc3589-2", - .data = (void *)LTC3589_2, - }, - { }, +static const struct of_device_id __maybe_unused ltc3589_of_match[] = { + { .compatible = "lltc,ltc3589", .data = <c3589_info }, + { .compatible = "lltc,ltc3589-1", .data = <c3589_12_info }, + { .compatible = "lltc,ltc3589-2", .data = <c3589_12_info }, + { } }; MODULE_DEVICE_TABLE(of, ltc3589_of_match); static struct i2c_driver ltc3589_driver = { .driver = { .name = DRIVER_NAME, + .probe_type = PROBE_PREFER_ASYNCHRONOUS, .of_match_table = of_match_ptr(ltc3589_of_match), }, .probe = ltc3589_probe, |