Re: DTS question - MPC5200b

On Feb 12, 2008 10:37 AM, Nick [off-list ref] wrote:

Hi,

I need some help.  I am trying to access timer 7 on the MPC5200B
processor.  I have the DTS file setup like this

        gpt@670 {    // General Purpose Timer
          device_type = "gpt";
            compatible = "fsl,mpc5200b-gpt","fsl,mpc5200-gpt";
            cell-index = <7>;
            reg = <670 10>;
            interrupts = <1 10 0>;
            interrupt-parent = <&mpc5200_pic>;
        };

I have timers 0 to 6 defined the same way except the cell-index reflects
the timer number.

In my platform file where I am doing my board setup, I tried the  following.

timer7 = mpc52xx_find_and_map ("mpc5200b-gpt");

Don't use find_and_map; it was a stupid API that I never should have written.

Instead, use for_each_compatible_node() or for_each_matching_node() to
iterate over them until you find the one with the correct reg address.

Then you can use of_iomap() to map the device registers.

How do I specify the timer based on the cell-index?

Match on the reg property instead of cell-index; I'll probably be
dropping the cell-index property from future 5200 device trees because
it just ends up duplicating information already provided by reg.

Cheers,
g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.