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gerrit.devboardsforandroid.linaro.org / platform / external / u-boot / 6bb6049bf2ecde91b62a4b3d55fa6ee8ed61520e / . / doc / driver-model / UDM-rtc.txt
blob: 3640d24c2847197dea82c7a79308fa4128b9a584 [file] [log] [blame]
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]1=============================
2RTC device subsystem analysis
3=============================
4
5Tomas Hlavacek <tmshlvck@gmail.com>
62012-03-10
7
8I) Overview
9-----------
10
11U-Boot currently implements one common API for RTC devices. The interface
12is defined in include/rtc.h and comprises of functions and structures:
13
14 struct rtc_time {
Wolfgang Denk93e14592013-10-04 17:43:24 +0200[diff] [blame]15 int tm_sec;
16 int tm_min;
17 int tm_hour;
18 int tm_mday;
19 int tm_mon;
20 int tm_year;
21 int tm_wday;
22 int tm_yday;
23 int tm_isdst;
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]24 };
25
26 int rtc_get (struct rtc_time *);
27 int rtc_set (struct rtc_time *);
28 void rtc_reset (void);
29
30The functions are implemented by a proper device driver in drivers/rtc
31directory and the driver to be compiled in is selected in a Makefile.
32Drivers are mutually exclusive.
33
34Drivers depends on date code in drivers/rtc/date.c and naturally on board
35specific data.
36
37II) Approach
38------------
39
40 1) New API
41 ----------
42 In the UDM each rtc driver would register itself by a function
43
44 int rtc_device_register(struct instance *i,
Wolfgang Denk93e14592013-10-04 17:43:24 +0200[diff] [blame]45 struct rtc_device_ops *o);
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]46
47 The structure being defined as follows:
48
49 struct rtc_device_ops {
Wolfgang Denk93e14592013-10-04 17:43:24 +0200[diff] [blame]50 int (*get_time)(struct instance *i, struct rtc_time *t);
51 int (*set_time)(struct instance *i, struct rtc_time *t);
52 int (*reset)(struct instance *i);
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]53 };
54
55
56 2) Conversion thougths
57 ----------------------
58 U-Boot RTC drivers exports the same functions and therefore the conversion
59 of the drivers is straight-forward. There is no initialization needed.
60
61
62III) Analysis of in-tree drivers
63--------------------------------
64
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]65 drivers/rtc/rv3029.c
66 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]67 The driver is standard rtc. Simple conversion is possible.
68
69
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]70 drivers/rtc/s3c24x0_rtc.c
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]71 -------------------------
72 The driver is standard rtc. Simple conversion is possible.
73
74
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]75 drivers/rtc/pt7c4338.c
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]76 ----------------------
77 The driver is standard rtc. Simple conversion is possible.
78
79
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]80 drivers/rtc/mvrtc.c
81 -------------------
82 The driver is standard rtc. Simple conversion is possible.
83
84
85 drivers/rtc/ftrtc010.c
86 ----------------------
87 The driver is standard rtc. Simple conversion is possible.
88
89
90 drivers/rtc/mpc5xxx.c
91 ---------------------
92 The driver is standard rtc. Simple conversion is possible.
93
94
95 drivers/rtc/ds164x.c
96 --------------------
97 The driver is standard rtc. Simple conversion is possible.
98
99
100 drivers/rtc/rs5c372.c
101 ---------------------
102 The driver is standard rtc. Simple conversion is possible.
103
104
105 drivers/rtc/m41t94.c
106 --------------------
107 The driver is standard rtc. Simple conversion is possible.
108
109
110 drivers/rtc/mc13xxx-rtc.c
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]111 -------------------------
112 The driver is standard rtc. Simple conversion is possible.
113
114
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]115 drivers/rtc/mcfrtc.c
116 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]117 The driver is standard rtc. Simple conversion is possible.
118
119
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]120 drivers/rtc/davinci.c
121 ---------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]122 The driver is standard rtc. Simple conversion is possible.
123
124
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]125 drivers/rtc/rx8025.c
126 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]127 The driver is standard rtc. Simple conversion is possible.
128
129
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]130 drivers/rtc/bfin_rtc.c
131 ----------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]132 The driver is standard rtc. Simple conversion is possible.
133
134
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]135 drivers/rtc/m41t62.c
136 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]137 The driver is standard rtc. Simple conversion is possible.
138
139
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]140 drivers/rtc/ds1306.c
141 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]142 The driver is standard rtc. Simple conversion is possible.
143
144
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]145 drivers/rtc/mpc8xx.c
146 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]147 The driver is standard rtc. Simple conversion is possible.
148
149
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]150 drivers/rtc/ds3231.c
151 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]152 The driver is standard rtc. Simple conversion is possible.
153
154
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]155 drivers/rtc/ds12887.c
156 ---------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]157 The driver is standard rtc. Simple conversion is possible.
158
159
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]160 drivers/rtc/ds1302.c
161 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]162 The driver is standard rtc. Simple conversion is possible.
163
164
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]165 drivers/rtc/ds1374.c
166 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]167 The driver is standard rtc. Simple conversion is possible.
168
169
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]170 drivers/rtc/ds174x.c
171 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]172 The driver is standard rtc. Simple conversion is possible.
173
174
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]175 drivers/rtc/m41t60.c
176 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]177 The driver is standard rtc. Simple conversion is possible.
178
179
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]180 drivers/rtc/m48t35ax.c
181 ----------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]182 The driver is standard rtc. Simple conversion is possible.
183
184
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]185 drivers/rtc/pl031.c
186 -------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]187 The driver is standard rtc. Simple conversion is possible.
188
189
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]190 drivers/rtc/x1205.c
191 -------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]192 The driver is standard rtc. Simple conversion is possible.
193
194
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]195 drivers/rtc/m41t11.c
196 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]197 The driver is standard rtc. Simple conversion is possible.
198
199
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]200 drivers/rtc/pcf8563.c
201 ---------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]202 The driver is standard rtc. Simple conversion is possible.
203
204
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]205 drivers/rtc/mk48t59.c
206 ---------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]207 Macros needs cleanup. Besides that the driver is standard rtc.
208 Simple conversion is possible.
209
210
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]211 drivers/rtc/mxsrtc.c
212 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]213 The driver is standard rtc. Simple conversion is possible.
214
215
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]216 drivers/rtc/ds1307.c
217 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]218 The driver is standard rtc. Simple conversion is possible.
219
220
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]221 drivers/rtc/ds1556.c
222 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]223 The driver is standard rtc. Simple conversion is possible.
224
225
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]226 drivers/rtc/rtc4543.c
227 ---------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]228 The driver is standard rtc. Simple conversion is possible.
229
230
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]231 drivers/rtc/ds1337.c
232 --------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]233 The driver is standard rtc. Simple conversion is possible.
234
235
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]236 drivers/rtc/isl1208.c
237 ---------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]238 The driver is standard rtc. Simple conversion is possible.
239
240
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]241 drivers/rtc/max6900.c
242 ---------------------
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]243 The driver is standard rtc. Simple conversion is possible.
244
245
Masahiro Yamada566c6e42013-09-24 10:32:04 +0900[diff] [blame]246 drivers/rtc/mc146818.c
247 ----------------------
248 The driver is standard rtc. Simple conversion is possible.
249
250
251 drivers/rtc/at91sam9_rtt.c
Tomas Hlavacek0d9e5992012-08-08 01:42:29 +0000[diff] [blame]252 --------------------------
253 The driver is standard rtc. Simple conversion is possible.