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.
80 tristate "Xicor/Intersil X1205"
81 depends on RTC_CLASS && I2C
83 If you say yes here you get support for the
84 Xicor/Intersil X1205 RTC chip.
86 This driver can also be built as a module. If so, the module
87 will be called rtc-x1205.
90 tristate "Dallas/Maxim DS1307 and similar I2C RTC chips"
91 depends on RTC_CLASS && I2C
93 If you say yes here you get support for various compatible RTC
94 chips (often with battery backup) connected with I2C. This driver
95 should handle DS1307, DS1337, DS1338, DS1339, DS1340, ST M41T00,
96 and probably other chips. In some cases the RTC must already
97 have been initialized (by manufacturing or a bootloader).
99 The first seven registers on these chips hold an RTC, and other
100 registers may add features such as NVRAM, a trickle charger for
101 the RTC/NVRAM backup power, and alarms. This driver may not
102 expose all those available chip features.
104 This driver can also be built as a module. If so, the module
105 will be called rtc-ds1307.
107 config RTC_DRV_DS1672
108 tristate "Dallas/Maxim DS1672"
109 depends on RTC_CLASS && I2C
111 If you say yes here you get support for the
112 Dallas/Maxim DS1672 timekeeping chip.
114 This driver can also be built as a module. If so, the module
115 will be called rtc-ds1672.
117 config RTC_DRV_PCF8563
118 tristate "Philips PCF8563/Epson RTC8564"
119 depends on RTC_CLASS && I2C
121 If you say yes here you get support for the
122 Philips PCF8563 RTC chip. The Epson RTC8564
125 This driver can also be built as a module. If so, the module
126 will be called rtc-pcf8563.
128 config RTC_DRV_RS5C372
129 tristate "Ricoh RS5C372A/B"
130 depends on RTC_CLASS && I2C
132 If you say yes here you get support for the
133 Ricoh RS5C372A and RS5C372B RTC chips.
135 This driver can also be built as a module. If so, the module
136 will be called rtc-rs5c372.
138 config RTC_DRV_M48T86
139 tristate "ST M48T86/Dallas DS12887"
142 If you say Y here you will get support for the
143 ST M48T86 and Dallas DS12887 RTC chips.
145 This driver can also be built as a module. If so, the module
146 will be called rtc-m48t86.
148 config RTC_DRV_EP93XX
149 tristate "Cirrus Logic EP93XX"
150 depends on RTC_CLASS && ARCH_EP93XX
152 If you say yes here you get support for the
153 RTC embedded in the Cirrus Logic EP93XX processors.
155 This driver can also be built as a module. If so, the module
156 will be called rtc-ep93xx.
158 config RTC_DRV_SA1100
159 tristate "SA11x0/PXA2xx"
160 depends on RTC_CLASS && (ARCH_SA1100 || ARCH_PXA)
162 If you say Y here you will get access to the real time clock
163 built into your SA11x0 or PXA2xx CPU.
165 To compile this driver as a module, choose M here: the
166 module will be called rtc-sa1100.
168 config RTC_DRV_VR41XX
169 tristate "NEC VR41XX"
170 depends on RTC_CLASS && CPU_VR41XX
172 If you say Y here you will get access to the real time clock
173 built into your NEC VR41XX CPU.
175 To compile this driver as a module, choose M here: the
176 module will be called rtc-vr41xx.
179 tristate "ARM AMBA PL031 RTC"
180 depends on RTC_CLASS && ARM_AMBA
182 If you say Y here you will get access to ARM AMBA
183 PrimeCell PL031 UART found on certain ARM SOCs.
185 To compile this driver as a module, choose M here: the
186 module will be called rtc-pl031.
189 tristate "Test driver/device"
192 If you say yes here you get support for the
193 RTC test driver. It's a software RTC which can be
194 used to test the RTC subsystem APIs. It gets
195 the time from the system clock.
196 You want this driver only if you are doing development
197 on the RTC subsystem. Please read the source code
200 This driver can also be built as a module. If so, the module
201 will be called rtc-test.