linux-kernel - Re: [PATCH v3 2/4] pwm: rockchip: Allow polarity invert on rk3288

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Date:	Wed, 20 Aug 2014 12:31:15 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Thierry Reding <thierry.reding@...il.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Caesar Wang <caesar.wang@...k-chips.com>,
	Sonny Rao <sonnyrao@...omium.org>,
	Olof Johansson <olof@...om.net>,
	Eddie Cai <eddie.cai@...k-chips.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	linux-pwm <linux-pwm@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, hpa@...or.com
Subject: Re: [PATCH v3 2/4] pwm: rockchip: Allow polarity invert on rk3288

Dmitry,

On Wed, Aug 20, 2014 at 12:29 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
> On August 20, 2014 1:54:11 PM CDT, Doug Anderson <dianders@...omium.org> wrote:
>>On Wed, Aug 20, 2014 at 3:04 AM, Thierry Reding
>><thierry.reding@...il.com> wrote:
>>> On Tue, Aug 19, 2014 at 09:07:54AM -0700, Doug Anderson wrote:
>>>> The rk3288 has the ability to invert
>>>> +     struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip);
>>>> +
>>>> +     if (!pc->data->has_invert)
>>>> +             return -ENOSYS;
>>>> +
>
> At the kernel summit hpa also mentioned that ENOSYS should only be used for missing syscalls. Not sure what error code would suit better here though...

Luckily this code is gone now.  See v4 of the series.  ;)

-Doug
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