From: "Albrecht Dreß" <albrecht.dress@arcor•de>
To: linuxppc-dev@lists•ozlabs.org
Subject: Q: how to access the MPC5200B's timer gipo's?
Date: Wed, 9 Dec 2009 17:28:13 +0100 (CET) [thread overview]
Message-ID: <10228901.1260376093135.JavaMail.ngmail@webmail18.arcor-online.net> (raw)
Hi all,
I have a (probably dumb) question regarding the access to the MPC5200B's timer gpio's. I added e.g.
timer@640 { // General Purpose Timer 4
compatible = "fsl,mpc5200b-gpt","fsl,mpc5200-gpt";
reg = <0x640 0x10>;
interrupts = <1 13 0>;
interrupt-parent = <&mpc5200_pic>;
gpio-controller;
#gpio-cells = <2>;
};
in the DTS file to several timers. Several gpiochipxxx folders are now present in /sys/class/gpio/.
In my code, I grab the node by calling of_find_node_by_path("/soc5200@f0000000/timer@640"), which returns the proper node. Then I try to get the gpio number (for a call to gpio_set_value()) by calling of_get_gpio(node, 0) with the node found above. However, this call always dumps
of_get_gpio_flags: can't parse gpios property
of_get_gpio_flags exited with status -2
What would be the proper way to determine the gpio number for a timer's gpio pin from the node name or path?
Thanks for any help,
Albrecht.
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next reply other threads:[~2009-12-09 16:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-09 16:28 Albrecht Dreß [this message]
2009-12-11 6:02 ` Q: how to access the MPC5200B's timer gipo's? Grant Likely
2009-12-11 17:55 ` Albrecht Dreß
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