diff options
| author | David Gibson <dwg@au1.ibm.com> | 2008-01-11 14:25:34 +1100 |
|---|---|---|
| committer | Josh Boyer <jwboyer@linux.vnet.ibm.com> | 2008-01-25 07:07:26 -0600 |
| commit | 22258fa40e54ceefe75a6c6a793f5c44d8339b9c (patch) | |
| tree | 6a77172e80c134ba4c46889e309d00494e6f8211 /arch/powerpc/platforms | |
| parent | a40955167ffc34a1651ebe2e88a8c1db2987fc91 (diff) | |
[POWERPC] Enable RTC for Ebony and Walnut (v2)
This patch extends the Ebony and Walnut platform code to instantiate
the existing ds1742 RTC class driver for the DS1743 RTC/NVRAM chip
found on both those boards. The patch uses a helper function to scan
the device tree and instantiate the appropriate platform_device based
on it, so it should be easy to extend for other boards which have mmio
mapped RTC chips.
Along with this, the device tree binding for the ds1743 chips is
tweaked, based on the existing DS1385 OF binding found at:
http://playground.sun.com/1275/proposals/Closed/Remanded/Accepted/346-it.txt
Although that document covers the NVRAM portion of the chip, whereas
here we're interested in the RTC portion, so it's not entirely clear
if that's a good model.
This implements only RTC class driver support - that is /dev/rtc0, not
/dev/rtc, and the low-level get/set time callbacks remain
unimplemented. That means in order to get at the clock you will
either need a modified version of hwclock which will look at
/dev/rtc0, or you'll need to configure udev to symlink rtc0 to rtc.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Diffstat (limited to 'arch/powerpc/platforms')
| -rw-r--r-- | arch/powerpc/platforms/40x/walnut.c | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/44x/Kconfig | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/44x/ebony.c | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/Kconfig | 6 |
4 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/40x/walnut.c b/arch/powerpc/platforms/40x/walnut.c index f115b6dbf5a..5d9edd917f9 100644 --- a/arch/powerpc/platforms/40x/walnut.c +++ b/arch/powerpc/platforms/40x/walnut.c @@ -36,6 +36,7 @@ static __initdata struct of_device_id walnut_of_bus[] = { static int __init walnut_device_probe(void) { of_platform_bus_probe(NULL, walnut_of_bus, NULL); + of_instantiate_rtc(); return 0; } diff --git a/arch/powerpc/platforms/44x/Kconfig b/arch/powerpc/platforms/44x/Kconfig index d2480130534..c3e4e8c3c46 100644 --- a/arch/powerpc/platforms/44x/Kconfig +++ b/arch/powerpc/platforms/44x/Kconfig @@ -13,6 +13,7 @@ config EBONY default y select 440GP select PCI + select OF_RTC help This option enables support for the IBM PPC440GP evaluation board. diff --git a/arch/powerpc/platforms/44x/ebony.c b/arch/powerpc/platforms/44x/ebony.c index 481a016e153..1a8d467bff8 100644 --- a/arch/powerpc/platforms/44x/ebony.c +++ b/arch/powerpc/platforms/44x/ebony.c @@ -18,6 +18,7 @@ #include <linux/init.h> #include <linux/of_platform.h> +#include <linux/rtc.h> #include <asm/machdep.h> #include <asm/prom.h> @@ -38,6 +39,7 @@ static __initdata struct of_device_id ebony_of_bus[] = { static int __init ebony_device_probe(void) { of_platform_bus_probe(NULL, ebony_of_bus, NULL); + of_instantiate_rtc(); return 0; } diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig index 2cec34314d2..4286664741d 100644 --- a/arch/powerpc/platforms/Kconfig +++ b/arch/powerpc/platforms/Kconfig @@ -321,6 +321,12 @@ config FSL_ULI1575 config CPM bool +config OF_RTC + bool + help + Uses information from the OF or flattened device tree to instatiate + platform devices for direct mapped RTC chips like the DS1742 or DS1743. + source "arch/powerpc/sysdev/bestcomm/Kconfig" endmenu |