1 /*
2 * Copyright (c) 2024 GARDENA GmbH
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #define DT_DRV_COMPAT silabs_si32_apb
8
9 #include <stdint.h>
10
11 #include <zephyr/device.h>
12 #include <zephyr/devicetree.h>
13 #include <zephyr/drivers/clock_control.h>
14
15 #include <SI32_CLKCTRL_A_Type.h>
16 #include <si32_device.h>
17
18 struct clock_control_si32_apb_config {
19 const struct device *clock_dev;
20 uint32_t divider;
21 };
22
clock_control_si32_apb_on(const struct device * dev,clock_control_subsys_t sys)23 static int clock_control_si32_apb_on(const struct device *dev, clock_control_subsys_t sys)
24 {
25 return -ENOTSUP;
26 }
27
clock_control_si32_apb_off(const struct device * dev,clock_control_subsys_t sys)28 static int clock_control_si32_apb_off(const struct device *dev, clock_control_subsys_t sys)
29 {
30
31 return -ENOTSUP;
32 }
33
clock_control_si32_apb_get_rate(const struct device * dev,clock_control_subsys_t sys,uint32_t * rate)34 static int clock_control_si32_apb_get_rate(const struct device *dev, clock_control_subsys_t sys,
35 uint32_t *rate)
36 {
37 const struct clock_control_si32_apb_config *config = dev->config;
38 const int ret = clock_control_get_rate(config->clock_dev, NULL, rate);
39
40 if (ret) {
41 return ret;
42 }
43
44 *rate /= config->divider;
45
46 return 0;
47 }
48
49 static DEVICE_API(clock_control, clock_control_si32_apb_api) = {
50 .on = clock_control_si32_apb_on,
51 .off = clock_control_si32_apb_off,
52 .get_rate = clock_control_si32_apb_get_rate,
53 };
54
clock_control_si32_apb_init(const struct device * dev)55 static int clock_control_si32_apb_init(const struct device *dev)
56 {
57 const struct clock_control_si32_apb_config *config = dev->config;
58
59 if (!device_is_ready(config->clock_dev)) {
60 return -ENODEV;
61 }
62
63 if (config->divider == 1) {
64 SI32_CLKCTRL_A_select_apb_divider_1(SI32_CLKCTRL_0);
65 } else if (config->divider == 2) {
66 SI32_CLKCTRL_A_select_apb_divider_2(SI32_CLKCTRL_0);
67 } else {
68 return -ENOTSUP;
69 }
70
71 return 0;
72 }
73
74 static const struct clock_control_si32_apb_config config = {
75 .clock_dev = DEVICE_DT_GET(DT_INST_CLOCKS_CTLR(0)),
76 .divider = DT_PROP(DT_NODELABEL(clk_apb), divider),
77 };
78
79 DEVICE_DT_INST_DEFINE(0, clock_control_si32_apb_init, NULL, NULL, &config, PRE_KERNEL_1,
80 CONFIG_CLOCK_CONTROL_INIT_PRIORITY, &clock_control_si32_apb_api);
81
