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a4a86d27 AG |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * phy-can-transceiver.c - phy driver for CAN transceivers | |
4 | * | |
5 | * Copyright (C) 2021 Texas Instruments Incorporated - https://www.ti.com | |
6 | * | |
7 | */ | |
8 | #include<linux/phy/phy.h> | |
9 | #include<linux/platform_device.h> | |
10 | #include<linux/module.h> | |
11 | #include<linux/gpio.h> | |
12 | #include<linux/gpio/consumer.h> | |
13 | ||
14 | struct can_transceiver_data { | |
15 | u32 flags; | |
16 | #define CAN_TRANSCEIVER_STB_PRESENT BIT(0) | |
17 | #define CAN_TRANSCEIVER_EN_PRESENT BIT(1) | |
18 | }; | |
19 | ||
20 | struct can_transceiver_phy { | |
21 | struct phy *generic_phy; | |
22 | struct gpio_desc *standby_gpio; | |
23 | struct gpio_desc *enable_gpio; | |
24 | }; | |
25 | ||
26 | /* Power on function */ | |
27 | static int can_transceiver_phy_power_on(struct phy *phy) | |
28 | { | |
29 | struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy); | |
30 | ||
31 | if (can_transceiver_phy->standby_gpio) | |
32 | gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 0); | |
33 | if (can_transceiver_phy->enable_gpio) | |
34 | gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 1); | |
35 | ||
36 | return 0; | |
37 | } | |
38 | ||
39 | /* Power off function */ | |
40 | static int can_transceiver_phy_power_off(struct phy *phy) | |
41 | { | |
42 | struct can_transceiver_phy *can_transceiver_phy = phy_get_drvdata(phy); | |
43 | ||
44 | if (can_transceiver_phy->standby_gpio) | |
45 | gpiod_set_value_cansleep(can_transceiver_phy->standby_gpio, 1); | |
46 | if (can_transceiver_phy->enable_gpio) | |
47 | gpiod_set_value_cansleep(can_transceiver_phy->enable_gpio, 0); | |
48 | ||
49 | return 0; | |
50 | } | |
51 | ||
52 | static const struct phy_ops can_transceiver_phy_ops = { | |
53 | .power_on = can_transceiver_phy_power_on, | |
54 | .power_off = can_transceiver_phy_power_off, | |
55 | .owner = THIS_MODULE, | |
56 | }; | |
57 | ||
58 | static const struct can_transceiver_data tcan1042_drvdata = { | |
59 | .flags = CAN_TRANSCEIVER_STB_PRESENT, | |
60 | }; | |
61 | ||
62 | static const struct can_transceiver_data tcan1043_drvdata = { | |
63 | .flags = CAN_TRANSCEIVER_STB_PRESENT | CAN_TRANSCEIVER_EN_PRESENT, | |
64 | }; | |
65 | ||
66 | static const struct of_device_id can_transceiver_phy_ids[] = { | |
67 | { | |
68 | .compatible = "ti,tcan1042", | |
69 | .data = &tcan1042_drvdata | |
70 | }, | |
71 | { | |
72 | .compatible = "ti,tcan1043", | |
73 | .data = &tcan1043_drvdata | |
74 | }, | |
75 | { } | |
76 | }; | |
77 | MODULE_DEVICE_TABLE(of, can_transceiver_phy_ids); | |
78 | ||
79 | static int can_transceiver_phy_probe(struct platform_device *pdev) | |
80 | { | |
81 | struct phy_provider *phy_provider; | |
82 | struct device *dev = &pdev->dev; | |
83 | struct can_transceiver_phy *can_transceiver_phy; | |
84 | const struct can_transceiver_data *drvdata; | |
85 | const struct of_device_id *match; | |
86 | struct phy *phy; | |
87 | struct gpio_desc *standby_gpio; | |
88 | struct gpio_desc *enable_gpio; | |
89 | u32 max_bitrate = 0; | |
90 | ||
91 | can_transceiver_phy = devm_kzalloc(dev, sizeof(struct can_transceiver_phy), GFP_KERNEL); | |
92 | if (!can_transceiver_phy) | |
93 | return -ENOMEM; | |
94 | ||
95 | match = of_match_node(can_transceiver_phy_ids, pdev->dev.of_node); | |
96 | drvdata = match->data; | |
97 | ||
98 | phy = devm_phy_create(dev, dev->of_node, | |
99 | &can_transceiver_phy_ops); | |
100 | if (IS_ERR(phy)) { | |
101 | dev_err(dev, "failed to create can transceiver phy\n"); | |
102 | return PTR_ERR(phy); | |
103 | } | |
104 | ||
105 | device_property_read_u32(dev, "max-bitrate", &max_bitrate); | |
106 | if (!max_bitrate) | |
107 | dev_warn(dev, "Invalid value for transceiver max bitrate. Ignoring bitrate limit\n"); | |
108 | phy->attrs.max_link_rate = max_bitrate; | |
109 | ||
110 | can_transceiver_phy->generic_phy = phy; | |
111 | ||
112 | if (drvdata->flags & CAN_TRANSCEIVER_STB_PRESENT) { | |
113 | standby_gpio = devm_gpiod_get(dev, "standby", GPIOD_OUT_HIGH); | |
114 | if (IS_ERR(standby_gpio)) | |
115 | return PTR_ERR(standby_gpio); | |
116 | can_transceiver_phy->standby_gpio = standby_gpio; | |
117 | } | |
118 | ||
119 | if (drvdata->flags & CAN_TRANSCEIVER_EN_PRESENT) { | |
120 | enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); | |
121 | if (IS_ERR(enable_gpio)) | |
122 | return PTR_ERR(enable_gpio); | |
123 | can_transceiver_phy->enable_gpio = enable_gpio; | |
124 | } | |
125 | ||
126 | phy_set_drvdata(can_transceiver_phy->generic_phy, can_transceiver_phy); | |
127 | ||
128 | phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); | |
129 | ||
130 | return PTR_ERR_OR_ZERO(phy_provider); | |
131 | } | |
132 | ||
133 | static struct platform_driver can_transceiver_phy_driver = { | |
134 | .probe = can_transceiver_phy_probe, | |
135 | .driver = { | |
136 | .name = "can-transceiver-phy", | |
137 | .of_match_table = can_transceiver_phy_ids, | |
138 | }, | |
139 | }; | |
140 | ||
141 | module_platform_driver(can_transceiver_phy_driver); | |
142 | ||
143 | MODULE_AUTHOR("Faiz Abbas <faiz_abbas@ti.com>"); | |
144 | MODULE_AUTHOR("Aswath Govindraju <a-govindraju@ti.com>"); | |
145 | MODULE_DESCRIPTION("CAN TRANSCEIVER PHY driver"); | |
146 | MODULE_LICENSE("GPL v2"); |