1 /*
2 * Copyright (c) 2023 Nordic Semiconductor ASA
3 * SPDX-License-Identifier: Apache-2.0
4 */
5
6 #define DT_DRV_COMPAT nordic_npm6001
7
8 #include <errno.h>
9
10 #include <zephyr/drivers/i2c.h>
11 #include <zephyr/sys/util.h>
12
13 /* nPM6001 registers */
14 #define NPM6001_BUCK3SELDAC 0x44U
15 #define NPM6001_BUCKMODEPADCONF 0x4EU
16 #define NPM6001_PADDRIVESTRENGTH 0x53U
17
18 /* nPM6001 BUCKMODEPADCONF fields */
19 #define NPM6001_BUCKMODEPADCONF_BUCKMODE0PADTYPE_CMOS BIT(0)
20 #define NPM6001_BUCKMODEPADCONF_BUCKMODE1PADTYPE_CMOS BIT(1)
21 #define NPM6001_BUCKMODEPADCONF_BUCKMODE2PADTYPE_CMOS BIT(2)
22 #define NPM6001_BUCKMODEPADCONF_BUCKMODE0PULLD_ENABLED BIT(4)
23 #define NPM6001_BUCKMODEPADCONF_BUCKMODE1PULLD_ENABLED BIT(5)
24 #define NPM6001_BUCKMODEPADCONF_BUCKMODE2PULLD_ENABLED BIT(6)
25
26 /* nPM6001 PADDRIVESTRENGTH fields */
27 #define NPM6001_PADDRIVESTRENGTH_READY_HIGH BIT(2)
28 #define NPM6001_PADDRIVESTRENGTH_NINT_HIGH BIT(3)
29 #define NPM6001_PADDRIVESTRENGTH_SDA_HIGH BIT(5)
30
31 struct mfd_npm6001_config {
32 struct i2c_dt_spec i2c;
33 uint8_t buck_pad_val;
34 uint8_t pad_val;
35 };
36
mfd_npm6001_init(const struct device * dev)37 static int mfd_npm6001_init(const struct device *dev)
38 {
39 const struct mfd_npm6001_config *config = dev->config;
40 int ret;
41
42 if (!i2c_is_ready_dt(&config->i2c)) {
43 return -ENODEV;
44 }
45
46 /* always select BUCK3 DAC (does not increase power consumption) */
47 ret = i2c_reg_write_byte_dt(&config->i2c, NPM6001_BUCK3SELDAC, 1U);
48 if (ret < 0) {
49 return ret;
50 }
51
52 /* configure pad properties */
53 ret = i2c_reg_write_byte_dt(&config->i2c, NPM6001_BUCKMODEPADCONF, config->buck_pad_val);
54 if (ret < 0) {
55 return ret;
56 }
57
58 ret = i2c_reg_write_byte_dt(&config->i2c, NPM6001_PADDRIVESTRENGTH, config->pad_val);
59 if (ret < 0) {
60 return ret;
61 }
62
63 return 0;
64 }
65
66 #define MFD_NPM6001_DEFINE(inst) \
67 static const struct mfd_npm6001_config config##inst = { \
68 .i2c = I2C_DT_SPEC_INST_GET(inst), \
69 .buck_pad_val = ((DT_INST_ENUM_IDX(inst, nordic_buck_mode0_input_type) * \
70 NPM6001_BUCKMODEPADCONF_BUCKMODE0PADTYPE_CMOS) | \
71 (DT_INST_ENUM_IDX(inst, nordic_buck_mode1_input_type) * \
72 NPM6001_BUCKMODEPADCONF_BUCKMODE1PADTYPE_CMOS) | \
73 (DT_INST_ENUM_IDX(inst, nordic_buck_mode2_input_type) * \
74 NPM6001_BUCKMODEPADCONF_BUCKMODE2PADTYPE_CMOS) | \
75 (DT_INST_PROP(inst, nordic_buck_mode0_pull_down) * \
76 NPM6001_BUCKMODEPADCONF_BUCKMODE0PULLD_ENABLED) | \
77 (DT_INST_PROP(inst, nordic_buck_mode1_pull_down) * \
78 NPM6001_BUCKMODEPADCONF_BUCKMODE1PULLD_ENABLED) | \
79 (DT_INST_PROP(inst, nordic_buck_mode2_pull_down) * \
80 NPM6001_BUCKMODEPADCONF_BUCKMODE2PULLD_ENABLED)), \
81 .pad_val = ((DT_INST_PROP(inst, nordic_ready_high_drive) * \
82 NPM6001_PADDRIVESTRENGTH_READY_HIGH) | \
83 (DT_INST_PROP(inst, nordic_nint_high_drive) * \
84 NPM6001_PADDRIVESTRENGTH_NINT_HIGH) | \
85 (DT_INST_PROP(inst, nordic_sda_high_drive) * \
86 NPM6001_PADDRIVESTRENGTH_SDA_HIGH)), \
87 }; \
88 \
89 DEVICE_DT_INST_DEFINE(inst, mfd_npm6001_init, NULL, NULL, &config##inst, POST_KERNEL, \
90 CONFIG_MFD_INIT_PRIORITY, NULL);
91
92 DT_INST_FOREACH_STATUS_OKAY(MFD_NPM6001_DEFINE)
93
