On 11/28/07, Wolfgang Denk [off-list ref] wrote:

In message [ref] you wrote:

quoted

Regardless what I'm doing in the 2.6 kernel configuration I can't get
this RTC running (I activated RTC support and the driver for the M41T00
in the configuration).
hwclock --debug tells me:

You have to add the i2c device to this table in arch/powerpc/sysdev/fsl_soc.c

static struct i2c_driver_device i2c_devices[] __initdata = {
        {"ricoh,rs5c372a", "rtc-rs5c372", "rs5c372a",},
        {"ricoh,rs5c372b", "rtc-rs5c372", "rs5c372b",},
        {"ricoh,rv5c386",  "rtc-rs5c372", "rv5c386",},
        {"ricoh,rv5c387a", "rtc-rs5c372", "rv5c387a",},
        {"dallas,ds1307",  "rtc-ds1307",  "ds1307",},
        {"dallas,ds1337",  "rtc-ds1307",  "ds1337",},
        {"dallas,ds1338",  "rtc-ds1307",  "ds1338",},
        {"dallas,ds1339",  "rtc-ds1307",  "ds1339",},
        {"dallas,ds1340",  "rtc-ds1307",  "ds1340",},
        {"stm,m41t00",     "rtc-ds1307",  "m41t00"},
        {"dallas,ds1374",  "rtc-ds1374",  "rtc-ds1374",},
};

Then make a device tree node for it with the address.

		i2c@3d40 {
			compatible = "mpc5200b-i2c","mpc5200-i2c","fsl-i2c";
			reg = <3d40 40>;
			interrupts = <2 10 0>;
			interrupt-parent = <&mpc5200_pic>;
			fsl5200-clocking;

			rtc@51 {
				compatible = "epson,rtc8564";
				reg = <51>;
			};
		};
		
The device will be named /dev/rtc0. A more update to date version of
hwclock will find it or you can make a symlink from rtc to rtc0.

When it works right:
rtc-pcf8563 1-0051: rtc core: registered rtc-pcf8563 as rtc0
rtc-pcf8563 1-0051: setting system clock to 2007-11-28 16:53:12 UTC (1196268792)

I have a pending series of patches that removes this table and moves
the aliasing into the i2c drivers. It is waiting for a core change to
go into the i2c subsystem.

quoted

hwclock: Open of /dev/rtc failed, errno=19: No such device.

Well... did you check how your /dev/rtc is set up? It used  to  be  a
misc  device with MAJ=10 MIN=135 in old kernel versions, but now it's
MAJ=254 MIN=4, i. e. it should look like this:

crw-r--r-- 1 root root 254,   0 Jun 22 18:30 /dev/rtc


Best regards,

Wolfgang Denk

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