2 # RTC class/drivers configuration
12 depends on EXPERIMENTAL
16 Generic RTC class support. If you say yes here, you will
17 be allowed to plug one or more RTCs to your system. You will
18 probably want to enable one of more of the interfaces below.
20 This driver can also be built as a module. If so, the module
21 will be called rtc-class.
24 bool "Set system time from RTC on startup"
25 depends on RTC_CLASS = y
28 If you say yes here, the system time will be set using
29 the value read from the specified RTC device. This is useful
30 in order to avoid unnecessary fschk runs.
32 config RTC_HCTOSYS_DEVICE
33 string "The RTC to read the time from"
34 depends on RTC_HCTOSYS = y
37 The RTC device that will be used as the source for
38 the system time, usually rtc0.
40 comment "RTC interfaces"
45 depends on RTC_CLASS && SYSFS
48 Say yes here if you want to use your RTC using the sysfs
49 interface, /sys/class/rtc/rtcX .
51 This driver can also be built as a module. If so, the module
52 will be called rtc-sysfs.
56 depends on RTC_CLASS && PROC_FS
59 Say yes here if you want to use your RTC using the proc
60 interface, /proc/driver/rtc .
62 This driver can also be built as a module. If so, the module
63 will be called rtc-proc.
70 Say yes here if you want to use your RTC using the dev
73 This driver can also be built as a module. If so, the module
74 will be called rtc-dev.
76 config RTC_INTF_DEV_UIE_EMUL
77 bool "RTC UIE emulation on dev interface"
78 depends on RTC_INTF_DEV
80 Provides an emulation for RTC_UIE if the underlaying rtc chip
81 driver did not provide RTC_UIE ioctls.
87 tristate "Xicor/Intersil X1205"
88 depends on RTC_CLASS && I2C
90 If you say yes here you get support for the
91 Xicor/Intersil X1205 RTC chip.
93 This driver can also be built as a module. If so, the module
94 will be called rtc-x1205.
97 tristate "Dallas/Maxim DS1307 and similar I2C RTC chips"
98 depends on RTC_CLASS && I2C
100 If you say yes here you get support for various compatible RTC
101 chips (often with battery backup) connected with I2C. This driver
102 should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
103 and probably other chips. In some cases the RTC must already
104 have been initialized (by manufacturing or a bootloader).
106 The first seven registers on these chips hold an RTC, and other
107 registers may add features such as NVRAM, a trickle charger for
108 the RTC/NVRAM backup power, and alarms. This driver may not
109 expose all those available chip features.
111 This driver can also be built as a module. If so, the module
112 will be called rtc-ds1307.
114 config RTC_DRV_DS1672
115 tristate "Dallas/Maxim DS1672"
116 depends on RTC_CLASS && I2C
118 If you say yes here you get support for the
119 Dallas/Maxim DS1672 timekeeping chip.
121 This driver can also be built as a module. If so, the module
122 will be called rtc-ds1672.
124 config RTC_DRV_PCF8563
125 tristate "Philips PCF8563/Epson RTC8564"
126 depends on RTC_CLASS && I2C
128 If you say yes here you get support for the
129 Philips PCF8563 RTC chip. The Epson RTC8564
132 This driver can also be built as a module. If so, the module
133 will be called rtc-pcf8563.
135 config RTC_DRV_RS5C372
136 tristate "Ricoh RS5C372A/B"
137 depends on RTC_CLASS && I2C
139 If you say yes here you get support for the
140 Ricoh RS5C372A and RS5C372B RTC chips.
142 This driver can also be built as a module. If so, the module
143 will be called rtc-rs5c372.
145 config RTC_DRV_M48T86
146 tristate "ST M48T86/Dallas DS12887"
149 If you say Y here you will get support for the
150 ST M48T86 and Dallas DS12887 RTC chips.
152 This driver can also be built as a module. If so, the module
153 will be called rtc-m48t86.
155 config RTC_DRV_EP93XX
156 tristate "Cirrus Logic EP93XX"
157 depends on RTC_CLASS && ARCH_EP93XX
159 If you say yes here you get support for the
160 RTC embedded in the Cirrus Logic EP93XX processors.
162 This driver can also be built as a module. If so, the module
163 will be called rtc-ep93xx.
165 config RTC_DRV_SA1100
166 tristate "SA11x0/PXA2xx"
167 depends on RTC_CLASS && (ARCH_SA1100 || ARCH_PXA)
169 If you say Y here you will get access to the real time clock
170 built into your SA11x0 or PXA2xx CPU.
172 To compile this driver as a module, choose M here: the
173 module will be called rtc-sa1100.
175 config RTC_DRV_VR41XX
176 tristate "NEC VR41XX"
177 depends on RTC_CLASS && CPU_VR41XX
179 If you say Y here you will get access to the real time clock
180 built into your NEC VR41XX CPU.
182 To compile this driver as a module, choose M here: the
183 module will be called rtc-vr41xx.
186 tristate "ARM AMBA PL031 RTC"
187 depends on RTC_CLASS && ARM_AMBA
189 If you say Y here you will get access to ARM AMBA
190 PrimeCell PL031 UART found on certain ARM SOCs.
192 To compile this driver as a module, choose M here: the
193 module will be called rtc-pl031.
196 tristate "Test driver/device"
199 If you say yes here you get support for the
200 RTC test driver. It's a software RTC which can be
201 used to test the RTC subsystem APIs. It gets
202 the time from the system clock.
203 You want this driver only if you are doing development
204 on the RTC subsystem. Please read the source code
207 This driver can also be built as a module. If so, the module
208 will be called rtc-test.