linux-kernel - Re: [PATCH 4/4] Documentation: Add device tree bindings for Freescale FTM PWM

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Message-ID: <521BB40D.7040001@wwwdotorg.org>
Date:	Mon, 26 Aug 2013 14:01:17 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Xiubo Li-B47053 <B47053@...escale.com>
CC:	Thierry Reding <thierry.reding@...il.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Guo Shawn-R65073 <r65073@...escale.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"rob@...dley.net" <rob@...dley.net>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>
Subject: Re: [PATCH 4/4] Documentation: Add device tree bindings for Freescale
 FTM PWM

On 08/25/2013 11:35 PM, Xiubo Li-B47053 wrote:
>> Subject: Re: [PATCH 4/4] Documentation: Add device tree bindings for
...
>>> Why do you need to manipulate the pinctrl to en/disable a channel?
>>
>> This is because in Vybrid VF610 TOWER board, there are 4 leds, and each
>> led's one point(diode's positive pole) is connected to 3.3V, and the
>> other point is connected to pwm's one channel. When the 4 pinctrls are
>> configured as enable at the same time, the 4 pinctrls is low valtage, and
>> the 4 leds will be lighted up as default, then when you enable/disable
>> one led will effects others.
>>
>> These pinctrls are belong to pwm, and I don't think led or other customer
>> could control them directly.
>> So, here I authorize the 4 pinctrls to each channel controls.
>>
> "
> For the reason above, I have to control the pinctrls separately.
> 
> If all the pinctrls set as default state, the 8 pinctrls must be controlled together.
> And the 4 leds will all be lighted up as default and will influence each other.

Sorry, that still doesn't make much sense. Either way though, having
separate pinctrl setup for a single device isn't going to work. You'll
either need to have all combinations of 4 (8?) PWMs represented as
pinctrl states(!), or register separate PWM devices so that they get
independant pinctrl states.
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