Hello all,
I'm still working on the dts file for d-link dir-825-c1. I'm trying to
get the usb led to work. Configuring the led with gpio 11 alone is not
enough, the led stays dark, even if it appears in
/sys/kernel/debug/gpio:
gpio-11 ( |d-link:blue:usb ) out hi
On ar71xx in the mach file
ath79_gpio_output_select(11, AR934X_GPIO_OUT_GPIO);
is called to make it work. In a chat on irc it was suggested that this
could probably be done with some pinctrl magic, possibly with
"pinctrl-single,bits". But I have trouble coming up with the arguments.
I did an ar71xx compile before which I put some extra printk into
gpio.c:
void __init ath79_gpio_output_select(unsigned gpio, u8 val)
{
<snip>
printk("Here comes GPIO %u\n", gpio);
printk("t is %u and reg is %u\n", t, reg);
printk("base is %p and base + reg is %p\n", base, base + reg);
__raw_writel(t, base + reg);
/* flush write */
(void) __raw_readl(base + reg);
}
In dmesg I got this:
[ 0.135479] Here comes GPIO 11
[ 0.139500] t is 1572864 and reg is 52
[ 0.145149] base is b8040000 and base + reg is b8040034
These numbers are the same on every reboot. 1572864 is 0x180000.
I checked the mem area's content:
root@OpenWrt:~# devmem 0xb8040000 64
0x0003131B006FA420
I compiled an image that doesn't call ath79_gpio_output_select(). So usb
led was dark. I checked the same area again:
root@OpenWrt:~# devmem 0xb8040000 64
0x0003131B006FAC20
But really this doesn't tell me anything :)
Anybody knows if I can use pinctrl to get what I need and how to go
about it?
Thanks for reading!
Best regards,
Seb
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