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566c6e4370
Everytime a dead driver is removed from the list, we must re-number. This is a painful task. Try git showe53232250-- doc/driver-model/UDM-serial.txt git show6f62f4207-- doc/driver-model/UDM-serial.txt git showb9f4bc34a-- doc/driver-model/UDM-serial.txt to see what I mean. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
253 lines
5.6 KiB
Text
253 lines
5.6 KiB
Text
=============================
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RTC device subsystem analysis
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=============================
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Tomas Hlavacek <tmshlvck@gmail.com>
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2012-03-10
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I) Overview
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-----------
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U-Boot currently implements one common API for RTC devices. The interface
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is defined in include/rtc.h and comprises of functions and structures:
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struct rtc_time {
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int tm_sec;
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int tm_min;
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int tm_hour;
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int tm_mday;
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int tm_mon;
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int tm_year;
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int tm_wday;
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int tm_yday;
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int tm_isdst;
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};
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int rtc_get (struct rtc_time *);
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int rtc_set (struct rtc_time *);
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void rtc_reset (void);
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The functions are implemented by a proper device driver in drivers/rtc
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directory and the driver to be compiled in is selected in a Makefile.
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Drivers are mutually exclusive.
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Drivers depends on date code in drivers/rtc/date.c and naturally on board
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specific data.
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II) Approach
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------------
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1) New API
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----------
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In the UDM each rtc driver would register itself by a function
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int rtc_device_register(struct instance *i,
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struct rtc_device_ops *o);
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The structure being defined as follows:
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struct rtc_device_ops {
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int (*get_time)(struct instance *i, struct rtc_time *t);
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int (*set_time)(struct instance *i, struct rtc_time *t);
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int (*reset)(struct instance *i);
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};
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2) Conversion thougths
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----------------------
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U-Boot RTC drivers exports the same functions and therefore the conversion
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of the drivers is straight-forward. There is no initialization needed.
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III) Analysis of in-tree drivers
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--------------------------------
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drivers/rtc/rv3029.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/s3c24x0_rtc.c
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-------------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/pt7c4338.c
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----------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/mvrtc.c
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-------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/ftrtc010.c
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----------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/mpc5xxx.c
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---------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/ds164x.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/rs5c372.c
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---------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/m41t94.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/mc13xxx-rtc.c
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-------------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/mcfrtc.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/davinci.c
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---------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/rx8025.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/bfin_rtc.c
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----------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/m41t62.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/ds1306.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/mpc8xx.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/ds3231.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/ds12887.c
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---------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/ds1302.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/ds1374.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/ds174x.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/m41t60.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/m48t35ax.c
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----------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/pl031.c
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-------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/x1205.c
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-------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/m41t11.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/pcf8563.c
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---------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/mk48t59.c
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---------------------
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Macros needs cleanup. Besides that the driver is standard rtc.
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Simple conversion is possible.
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drivers/rtc/mxsrtc.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/ds1307.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/ds1556.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/rtc4543.c
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---------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/ds1337.c
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--------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/isl1208.c
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---------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/max6900.c
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---------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/mc146818.c
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----------------------
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The driver is standard rtc. Simple conversion is possible.
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drivers/rtc/at91sam9_rtt.c
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--------------------------
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The driver is standard rtc. Simple conversion is possible.
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