From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thierry Reding <thierry.reding@gmail.com>
Subject: Re: [exynos4412]How to test a pwm device, is there a test program?
Date: Mon, 9 Dec 2013 12:55:24 +0100
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On Mon, Dec 09, 2013 at 07:04:12PM +0800, randy wrote:
[...]
> Actually, I don't know whether the pwm works or not. In dmesg, I saw:
> [  853.690000] samsung-pwm 139d0000.pwm: tried to request PWM channel
> 0 without output
> [  876.930000] samsung-pwm 139d0000.pwm: tried to request PWM channel
> 0 without output
> [  879.615000] samsung-pwm 139d0000.pwm: tried to request PWM channel
> 1 without output
>=20
> in my dts, I only add
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
> pwm@139D0000 {
> 	status =3D "okay";
> };
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D
> is it enough to make pwm work, if the driver in kernel has been correct.

It seems like you're missing the samsung,pwm-outputs property (see
Documentation/devicetree/bindings/pwm/pwm-samsung.txt).

Thierry

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