1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
From 36122fec4390663b5c05d5836beb977ba2c09a68 Mon Sep 17 00:00:00 2001
From: Eyal Reizer <eyalr@ti.com>
Date: Thu, 23 May 2013 17:11:14 +0300
Subject: [PATCH 099/104] ti-st: add device tree support
When using device tree, driver configuration data need to be read from
device node.
Add support for getting the platform data information from the device
tree information stored in the .dtb file in case it exists.
Change-Id: I74f7f869fc257a057edb9f35c5fd8cbafb810164
Signed-off-by: Eyal Reizer <eyalr@ti.com>
Signed-off-by: bvijay <bvijay@ti.com>
Signed-off-by: Andrey Gusakov <andrey.gusakov@cogentembedded.com>
---
drivers/misc/ti-st/st_kim.c | 92 +++++++++++++++++++++++++++++++++++++++----
drivers/misc/ti-st/st_ll.c | 19 ++++++++-
2 files changed, 102 insertions(+), 9 deletions(-)
diff --git a/drivers/misc/ti-st/st_kim.c b/drivers/misc/ti-st/st_kim.c
index 71b6455..a36db89 100644
--- a/drivers/misc/ti-st/st_kim.c
+++ b/drivers/misc/ti-st/st_kim.c
@@ -43,6 +43,9 @@ static struct platform_device *st_kim_devices[MAX_ST_DEVICES];
/**********************************************************************/
/* internal functions */
+struct ti_st_plat_data *dt_pdata;
+static struct ti_st_plat_data *get_platform_data(struct device *dev);
+
/**
* st_get_plat_device -
* function which returns the reference to the platform device
@@ -464,7 +467,12 @@ long st_kim_start(void *kim_data)
struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
pr_info(" %s", __func__);
- pdata = kim_gdata->kim_pdev->dev.platform_data;
+ if (kim_gdata->kim_pdev->dev.of_node) {
+ pr_debug("use device tree data");
+ pdata = dt_pdata;
+ } else {
+ pdata = kim_gdata->kim_pdev->dev.platform_data;
+ }
do {
/* platform specific enabling code here */
@@ -524,12 +532,17 @@ long st_kim_stop(void *kim_data)
{
long err = 0;
struct kim_data_s *kim_gdata = (struct kim_data_s *)kim_data;
- struct ti_st_plat_data *pdata =
- kim_gdata->kim_pdev->dev.platform_data;
+ struct ti_st_plat_data *pdata;
struct tty_struct *tty = kim_gdata->core_data->tty;
reinit_completion(&kim_gdata->ldisc_installed);
+ if (kim_gdata->kim_pdev->dev.of_node) {
+ pr_debug("use device tree data");
+ pdata = dt_pdata;
+ } else
+ pdata = kim_gdata->kim_pdev->dev.platform_data;
+
if (tty) { /* can be called before ldisc is installed */
/* Flush any pending characters in the driver and discipline. */
tty_ldisc_flush(tty);
@@ -721,13 +734,53 @@ static const struct file_operations list_debugfs_fops = {
* board-*.c file
*/
+static const struct of_device_id kim_of_match[] = {
+{
+ .compatible = "kim",
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(of, kim_of_match);
+
+static struct ti_st_plat_data *get_platform_data(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ const u32 *dt_property;
+ int len;
+
+ dt_pdata = kzalloc(sizeof(*dt_pdata), GFP_KERNEL);
+
+ if (!dt_pdata)
+ pr_err("Can't allocate device_tree platform data\n");
+
+ dt_property = of_get_property(np, "dev_name", &len);
+ if (dt_property)
+ memcpy(&dt_pdata->dev_name, dt_property, len);
+ of_property_read_u32(np, "nshutdown_gpio",
+ (u32 *)&dt_pdata->nshutdown_gpio);
+ of_property_read_u32(np, "flow_cntrl", (u32 *)&dt_pdata->flow_cntrl);
+ of_property_read_u32(np, "baud_rate", (u32 *)&dt_pdata->baud_rate);
+
+ return dt_pdata;
+}
+
static struct dentry *kim_debugfs_dir;
static int kim_probe(struct platform_device *pdev)
{
struct kim_data_s *kim_gdata;
- struct ti_st_plat_data *pdata = pdev->dev.platform_data;
+ struct ti_st_plat_data *pdata;
int err;
+ if (pdev->dev.of_node)
+ pdata = get_platform_data(&pdev->dev);
+ else
+ pdata = pdev->dev.platform_data;
+
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "Platform Data is missing\n");
+ return -ENXIO;
+ }
+
if ((pdev->id != -1) && (pdev->id < MAX_ST_DEVICES)) {
/* multiple devices could exist */
st_kim_devices[pdev->id] = pdev;
@@ -808,9 +861,16 @@ err_core_init:
static int kim_remove(struct platform_device *pdev)
{
/* free the GPIOs requested */
- struct ti_st_plat_data *pdata = pdev->dev.platform_data;
+ struct ti_st_plat_data *pdata;
struct kim_data_s *kim_gdata;
+ if (pdev->dev.of_node) {
+ pr_debug("use device tree data");
+ pdata = dt_pdata;
+ } else {
+ pdata = pdev->dev.platform_data;
+ }
+
kim_gdata = platform_get_drvdata(pdev);
/* Free the Bluetooth/FM/GPIO
@@ -828,12 +888,22 @@ static int kim_remove(struct platform_device *pdev)
kfree(kim_gdata);
kim_gdata = NULL;
+ kfree(dt_pdata);
+ dt_pdata = NULL;
+
return 0;
}
static int kim_suspend(struct platform_device *pdev, pm_message_t state)
{
- struct ti_st_plat_data *pdata = pdev->dev.platform_data;
+ struct ti_st_plat_data *pdata;
+
+ if (pdev->dev.of_node) {
+ pr_debug("use device tree data");
+ pdata = dt_pdata;
+ } else {
+ pdata = pdev->dev.platform_data;
+ }
if (pdata->suspend)
return pdata->suspend(pdev, state);
@@ -843,7 +913,14 @@ static int kim_suspend(struct platform_device *pdev, pm_message_t state)
static int kim_resume(struct platform_device *pdev)
{
- struct ti_st_plat_data *pdata = pdev->dev.platform_data;
+ struct ti_st_plat_data *pdata;
+
+ if (pdev->dev.of_node) {
+ pr_debug("use device tree data");
+ pdata = dt_pdata;
+ } else {
+ pdata = pdev->dev.platform_data;
+ }
if (pdata->resume)
return pdata->resume(pdev);
@@ -860,6 +937,7 @@ static struct platform_driver kim_platform_driver = {
.resume = kim_resume,
.driver = {
.name = "kim",
+ .of_match_table = of_match_ptr(kim_of_match),
},
};
diff --git a/drivers/misc/ti-st/st_ll.c b/drivers/misc/ti-st/st_ll.c
index 93b4d67..644f00e 100644
--- a/drivers/misc/ti-st/st_ll.c
+++ b/drivers/misc/ti-st/st_ll.c
@@ -25,7 +25,10 @@
#include <linux/platform_device.h>
#include <linux/ti_wilink_st.h>
+extern struct ti_st_plat_data *dt_pdata;
+
/**********************************************************************/
+
/* internal functions */
static void send_ll_cmd(struct st_data_s *st_data,
unsigned char cmd)
@@ -53,7 +56,13 @@ static void ll_device_want_to_sleep(struct st_data_s *st_data)
/* communicate to platform about chip asleep */
kim_data = st_data->kim_data;
- pdata = kim_data->kim_pdev->dev.platform_data;
+ if (kim_data->kim_pdev->dev.of_node) {
+ pr_debug("use device tree data");
+ pdata = dt_pdata;
+ } else {
+ pdata = kim_data->kim_pdev->dev.platform_data;
+ }
+
if (pdata->chip_asleep)
pdata->chip_asleep(NULL);
}
@@ -86,7 +95,13 @@ static void ll_device_want_to_wakeup(struct st_data_s *st_data)
/* communicate to platform about chip wakeup */
kim_data = st_data->kim_data;
- pdata = kim_data->kim_pdev->dev.platform_data;
+ if (kim_data->kim_pdev->dev.of_node) {
+ pr_debug("use device tree data");
+ pdata = dt_pdata;
+ } else {
+ pdata = kim_data->kim_pdev->dev.platform_data;
+ }
+
if (pdata->chip_awake)
pdata->chip_awake(NULL);
}
--
1.7.10.4
|
