1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2018
4 * Lukasz Majewski, DENX Software Engineering, lukma@denx.de
5 *
6 */
7
8 #include <common.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <fsl_pmic.h>
12 #include <i2c.h>
13 #include <power/pmic.h>
14
15 DECLARE_GLOBAL_DATA_PTR;
16
mc34708_reg_count(struct udevice * dev)17 static int mc34708_reg_count(struct udevice *dev)
18 {
19 return PMIC_NUM_OF_REGS;
20 }
21
mc34708_write(struct udevice * dev,uint reg,const u8 * buff,int len)22 static int mc34708_write(struct udevice *dev, uint reg, const u8 *buff,
23 int len)
24 {
25 u8 buf[3] = { 0 };
26 int ret;
27
28 if (len != MC34708_TRANSFER_SIZE)
29 return -EINVAL;
30
31 /*
32 * The MC34708 sends data with big endian format, hence we need to
33 * perform manual byte swap.
34 */
35 buf[0] = buff[2];
36 buf[1] = buff[1];
37 buf[2] = buff[0];
38
39 ret = dm_i2c_write(dev, reg, buf, len);
40 if (ret)
41 printf("write error to device: %p register: %#x!\n", dev, reg);
42
43 return ret;
44 }
45
mc34708_read(struct udevice * dev,uint reg,u8 * buff,int len)46 static int mc34708_read(struct udevice *dev, uint reg, u8 *buff, int len)
47 {
48 u8 buf[3] = { 0 };
49 int ret;
50
51 if (len != MC34708_TRANSFER_SIZE)
52 return -EINVAL;
53
54 ret = dm_i2c_read(dev, reg, buf, len);
55 if (ret)
56 printf("read error from device: %p register: %#x!\n", dev, reg);
57
58 buff[0] = buf[2];
59 buff[1] = buf[1];
60 buff[2] = buf[0];
61
62 return ret;
63 }
64
mc34708_probe(struct udevice * dev)65 static int mc34708_probe(struct udevice *dev)
66 {
67 struct uc_pmic_priv *priv = dev_get_uclass_priv(dev);
68
69 priv->trans_len = MC34708_TRANSFER_SIZE;
70
71 /*
72 * Handle PMIC Errata 37: APS mode not fully functional,
73 * use explicit PWM or PFM instead
74 */
75 pmic_clrsetbits(dev, MC34708_REG_SW12_OPMODE,
76 MC34708_SW1AMODE_MASK | MC34708_SW2MODE_MASK,
77 SW_MODE_PWMPWM | (SW_MODE_PWMPWM << 14u));
78
79 pmic_clrsetbits(dev, MC34708_REG_SW345_OPMODE,
80 MC34708_SW3MODE_MASK | MC34708_SW4AMODE_MASK |
81 MC34708_SW4BMODE_MASK | MC34708_SW5MODE_MASK,
82 SW_MODE_PWMPWM | (SW_MODE_PWMPWM << 6u) |
83 (SW_MODE_PWMPWM << 12u) | (SW_MODE_PWMPWM << 18u));
84
85 return 0;
86 }
87
88 static struct dm_pmic_ops mc34708_ops = {
89 .reg_count = mc34708_reg_count,
90 .read = mc34708_read,
91 .write = mc34708_write,
92 };
93
94 static const struct udevice_id mc34708_ids[] = {
95 { .compatible = "fsl,mc34708" },
96 { }
97 };
98
99 U_BOOT_DRIVER(pmic_mc34708) = {
100 .name = "mc34708_pmic",
101 .id = UCLASS_PMIC,
102 .of_match = mc34708_ids,
103 .probe = mc34708_probe,
104 .ops = &mc34708_ops,
105 };
106