gpio: hog: requesting hog failed

Hi everybody,
I've just tried new gpio hog functionality, but maybe I misunderstand something or I'm doing something wrong?
Can someone help me with it, please?
Thanks, Jiri.

Here is dmesg:

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.3.0-rc4-next-20151006_cpm9g25+ (prchal@prchalpc) (gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-12ubuntu1) ) #7 PREEMPT Thu Oct 8 09:08:21 CEST 2015
[    0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f
...
[    0.243333] requesting hog GPIO in18 (chip fffff400.gpio, offset 28) failed
[    0.243333] requesting hog GPIO in19 (chip fffff400.gpio, offset 21) failed
[    0.246666] gpio-at91 fffff400.gpio: at address c8856400

...

and here my part of dts:
...

	ahb {
		apb {
			pinctrl@fffff400 {
				pioA: gpio@fffff400 {
					in18 {
						gpio-hog;
						gpios = <28 0>;
						input;
						line-name = "in18";
					};
					in19 {
						gpio-hog;
						gpios = <21 GPIO_ACTIVE_LOW>;
						input;
					};
				};

...

Sometimes this has something to do with driver probe order. For example if the driver uses a pin control backend to the GPIO, it will not be able to request its own GPIOs until after both drivers have probed.

You need to talk to the maintainers of this driver, J-C, Alexander Stein, Nicolas Ferre.

Yours,
Linus Walleij
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