1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2020 ROHM Semiconductors
3 // ROHM BD9576MUF/BD9573MUF regulator driver
5 #include <linux/delay.h>
7 #include <linux/gpio/consumer.h>
8 #include <linux/interrupt.h>
9 #include <linux/kernel.h>
10 #include <linux/mfd/rohm-bd957x.h>
11 #include <linux/mfd/rohm-generic.h>
12 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/regulator/driver.h>
16 #include <linux/regulator/machine.h>
17 #include <linux/regulator/of_regulator.h>
18 #include <linux/slab.h>
20 #define BD957X_VOUTS1_VOLT 3300000
21 #define BD957X_VOUTS4_BASE_VOLT 1030000
22 #define BD957X_VOUTS34_NUM_VOLT 32
24 static int vout1_volt_table
[] = {5000000, 4900000, 4800000, 4700000, 4600000,
25 4500000, 4500000, 4500000, 5000000, 5100000,
26 5200000, 5300000, 5400000, 5500000, 5500000,
29 static int vout2_volt_table
[] = {1800000, 1780000, 1760000, 1740000, 1720000,
30 1700000, 1680000, 1660000, 1800000, 1820000,
31 1840000, 1860000, 1880000, 1900000, 1920000,
34 static int voutl1_volt_table
[] = {2500000, 2540000, 2580000, 2620000, 2660000,
35 2700000, 2740000, 2780000, 2500000, 2460000,
36 2420000, 2380000, 2340000, 2300000, 2260000,
39 struct bd957x_regulator_data
{
40 struct regulator_desc desc
;
44 static int bd957x_vout34_list_voltage(struct regulator_dev
*rdev
,
45 unsigned int selector
)
47 const struct regulator_desc
*desc
= rdev
->desc
;
48 int multiplier
= selector
& desc
->vsel_mask
& 0x7f;
51 /* VOUT3 and 4 has 10mV step */
52 tune
= multiplier
* 10000;
54 if (!(selector
& 0x80))
55 return desc
->fixed_uV
- tune
;
57 return desc
->fixed_uV
+ tune
;
60 static int bd957x_list_voltage(struct regulator_dev
*rdev
,
61 unsigned int selector
)
63 const struct regulator_desc
*desc
= rdev
->desc
;
64 int index
= selector
& desc
->vsel_mask
& 0x7f;
66 if (!(selector
& 0x80))
67 index
+= desc
->n_voltages
/2;
69 if (index
>= desc
->n_voltages
)
72 return desc
->volt_table
[index
];
75 static const struct regulator_ops bd957x_vout34_ops
= {
76 .is_enabled
= regulator_is_enabled_regmap
,
77 .list_voltage
= bd957x_vout34_list_voltage
,
78 .get_voltage_sel
= regulator_get_voltage_sel_regmap
,
81 static const struct regulator_ops bd957X_vouts1_regulator_ops
= {
82 .is_enabled
= regulator_is_enabled_regmap
,
85 static const struct regulator_ops bd957x_ops
= {
86 .is_enabled
= regulator_is_enabled_regmap
,
87 .list_voltage
= bd957x_list_voltage
,
88 .get_voltage_sel
= regulator_get_voltage_sel_regmap
,
91 static struct bd957x_regulator_data bd9576_regulators
[] = {
95 .of_match
= of_match_ptr("regulator-vd50"),
96 .regulators_node
= of_match_ptr("regulators"),
98 .type
= REGULATOR_VOLTAGE
,
100 .volt_table
= &vout1_volt_table
[0],
101 .n_voltages
= ARRAY_SIZE(vout1_volt_table
),
102 .vsel_reg
= BD957X_REG_VOUT1_TUNE
,
103 .vsel_mask
= BD957X_MASK_VOUT1_TUNE
,
104 .enable_reg
= BD957X_REG_POW_TRIGGER1
,
105 .enable_mask
= BD957X_REGULATOR_EN_MASK
,
106 .enable_val
= BD957X_REGULATOR_DIS_VAL
,
107 .enable_is_inverted
= true,
108 .owner
= THIS_MODULE
,
114 .of_match
= of_match_ptr("regulator-vd18"),
115 .regulators_node
= of_match_ptr("regulators"),
117 .type
= REGULATOR_VOLTAGE
,
119 .volt_table
= &vout2_volt_table
[0],
120 .n_voltages
= ARRAY_SIZE(vout2_volt_table
),
121 .vsel_reg
= BD957X_REG_VOUT2_TUNE
,
122 .vsel_mask
= BD957X_MASK_VOUT2_TUNE
,
123 .enable_reg
= BD957X_REG_POW_TRIGGER2
,
124 .enable_mask
= BD957X_REGULATOR_EN_MASK
,
125 .enable_val
= BD957X_REGULATOR_DIS_VAL
,
126 .enable_is_inverted
= true,
127 .owner
= THIS_MODULE
,
133 .of_match
= of_match_ptr("regulator-vdddr"),
134 .regulators_node
= of_match_ptr("regulators"),
136 .ops
= &bd957x_vout34_ops
,
137 .type
= REGULATOR_VOLTAGE
,
138 .n_voltages
= BD957X_VOUTS34_NUM_VOLT
,
139 .vsel_reg
= BD957X_REG_VOUT3_TUNE
,
140 .vsel_mask
= BD957X_MASK_VOUT3_TUNE
,
141 .enable_reg
= BD957X_REG_POW_TRIGGER3
,
142 .enable_mask
= BD957X_REGULATOR_EN_MASK
,
143 .enable_val
= BD957X_REGULATOR_DIS_VAL
,
144 .enable_is_inverted
= true,
145 .owner
= THIS_MODULE
,
151 .of_match
= of_match_ptr("regulator-vd10"),
152 .regulators_node
= of_match_ptr("regulators"),
154 .ops
= &bd957x_vout34_ops
,
155 .type
= REGULATOR_VOLTAGE
,
156 .fixed_uV
= BD957X_VOUTS4_BASE_VOLT
,
157 .n_voltages
= BD957X_VOUTS34_NUM_VOLT
,
158 .vsel_reg
= BD957X_REG_VOUT4_TUNE
,
159 .vsel_mask
= BD957X_MASK_VOUT4_TUNE
,
160 .enable_reg
= BD957X_REG_POW_TRIGGER4
,
161 .enable_mask
= BD957X_REGULATOR_EN_MASK
,
162 .enable_val
= BD957X_REGULATOR_DIS_VAL
,
163 .enable_is_inverted
= true,
164 .owner
= THIS_MODULE
,
170 .of_match
= of_match_ptr("regulator-voutl1"),
171 .regulators_node
= of_match_ptr("regulators"),
174 .type
= REGULATOR_VOLTAGE
,
175 .volt_table
= &voutl1_volt_table
[0],
176 .n_voltages
= ARRAY_SIZE(voutl1_volt_table
),
177 .vsel_reg
= BD957X_REG_VOUTL1_TUNE
,
178 .vsel_mask
= BD957X_MASK_VOUTL1_TUNE
,
179 .enable_reg
= BD957X_REG_POW_TRIGGERL1
,
180 .enable_mask
= BD957X_REGULATOR_EN_MASK
,
181 .enable_val
= BD957X_REGULATOR_DIS_VAL
,
182 .enable_is_inverted
= true,
183 .owner
= THIS_MODULE
,
189 .of_match
= of_match_ptr("regulator-vouts1"),
190 .regulators_node
= of_match_ptr("regulators"),
192 .ops
= &bd957X_vouts1_regulator_ops
,
193 .type
= REGULATOR_VOLTAGE
,
195 .fixed_uV
= BD957X_VOUTS1_VOLT
,
196 .enable_reg
= BD957X_REG_POW_TRIGGERS1
,
197 .enable_mask
= BD957X_REGULATOR_EN_MASK
,
198 .enable_val
= BD957X_REGULATOR_DIS_VAL
,
199 .enable_is_inverted
= true,
200 .owner
= THIS_MODULE
,
205 static int bd957x_probe(struct platform_device
*pdev
)
207 struct regmap
*regmap
;
208 struct regulator_config config
= { 0 };
210 bool vout_mode
, ddr_sel
;
211 const struct bd957x_regulator_data
*reg_data
= &bd9576_regulators
[0];
212 unsigned int num_reg_data
= ARRAY_SIZE(bd9576_regulators
);
213 enum rohm_chip_type chip
= platform_get_device_id(pdev
)->driver_data
;
215 regmap
= dev_get_regmap(pdev
->dev
.parent
, NULL
);
217 dev_err(&pdev
->dev
, "No regmap\n");
220 vout_mode
= of_property_read_bool(pdev
->dev
.parent
->of_node
,
221 "rohm,vout1-en-low");
223 struct gpio_desc
*en
;
225 dev_dbg(&pdev
->dev
, "GPIO controlled mode\n");
227 /* VOUT1 enable state judged by VOUT1_EN pin */
228 /* See if we have GPIO defined */
229 en
= devm_gpiod_get_from_of_node(&pdev
->dev
,
230 pdev
->dev
.parent
->of_node
,
231 "rohm,vout1-en-gpios", 0,
232 GPIOD_OUT_LOW
, "vout1-en");
234 /* VOUT1_OPS gpio ctrl */
236 * Regulator core prioritizes the ena_gpio over
237 * enable/disable/is_enabled callbacks so no need to
238 * clear them. We can still use same ops
240 config
.ena_gpiod
= en
;
243 * In theory it is possible someone wants to set
244 * vout1-en LOW during OTP loading and set VOUT1 to be
245 * controlled by GPIO - but control the GPIO from some
246 * where else than this driver. For that to work we
247 * should unset the is_enabled callback here.
249 * I believe such case where rohm,vout1-en-low is set
250 * and vout1-en-gpios is not is likely to be a
251 * misconfiguration. So let's just err out for now.
254 "Failed to get VOUT1 control GPIO\n");
260 * If more than one PMIC needs to be controlled by same processor then
261 * allocate the regulator data array here and use bd9576_regulators as
262 * template. At the moment I see no such use-case so I spare some
263 * bytes and use bd9576_regulators directly for non-constant configs
264 * like DDR voltage selection.
266 ddr_sel
= of_property_read_bool(pdev
->dev
.parent
->of_node
,
269 bd9576_regulators
[2].desc
.fixed_uV
= 1350000;
271 bd9576_regulators
[2].desc
.fixed_uV
= 1500000;
274 case ROHM_CHIP_TYPE_BD9576
:
275 dev_dbg(&pdev
->dev
, "Found BD9576MUF\n");
277 case ROHM_CHIP_TYPE_BD9573
:
278 dev_dbg(&pdev
->dev
, "Found BD9573MUF\n");
281 dev_err(&pdev
->dev
, "Unsupported chip type\n");
286 config
.dev
= pdev
->dev
.parent
;
287 config
.regmap
= regmap
;
289 for (i
= 0; i
< num_reg_data
; i
++) {
291 const struct regulator_desc
*desc
;
292 struct regulator_dev
*rdev
;
293 const struct bd957x_regulator_data
*r
;
298 rdev
= devm_regulator_register(&pdev
->dev
, desc
, &config
);
301 "failed to register %s regulator\n",
307 * Clear the VOUT1 GPIO setting - rest of the regulators do not
308 * support GPIO control
310 config
.ena_gpiod
= NULL
;
317 static const struct platform_device_id bd957x_pmic_id
[] = {
318 { "bd9573-pmic", ROHM_CHIP_TYPE_BD9573
},
319 { "bd9576-pmic", ROHM_CHIP_TYPE_BD9576
},
322 MODULE_DEVICE_TABLE(platform
, bd957x_pmic_id
);
324 static struct platform_driver bd957x_regulator
= {
326 .name
= "bd957x-pmic",
328 .probe
= bd957x_probe
,
329 .id_table
= bd957x_pmic_id
,
332 module_platform_driver(bd957x_regulator
);
334 MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
335 MODULE_DESCRIPTION("ROHM BD9576/BD9573 voltage regulator driver");
336 MODULE_LICENSE("GPL");
337 MODULE_ALIAS("platform:bd957x-pmic");