linux-kernel - Re: [PATCH v4] ARM:dts:omap4-panda: Update the LED support for the panda DTS

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Date:	Thu, 16 May 2013 15:22:51 -0500
From:	Dan Murphy <dmurphy@...com>
To:	Nishanth Menon <nm@...com>
CC:	Benoît Cousson <b-cousson@...com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-omap <linux-omap@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] ARM:dts:omap4-panda: Update the LED support for the
 panda DTS

On 05/16/2013 01:18 PM, Nishanth Menon wrote:
> On Thu, May 16, 2013 at 10:35 AM, Dan Murphy <dmurphy@...com> wrote:
>> I am not sure you really want to do this.
>> If I make the pinctrl part of the led structure then the only way the gpio_wk7 on a1-a3 to be configured is when
>> the CONFIG_LEDS_GPIO flag is set.
>>
>> Do you really want that dependency?  You did say it was a key fix
>> At least this way the pins are configured regardless of that flag.
> That is better as the system will be left in the pinmux configuration
> handed over from bootloader.
So you want to depend on a boot loader to configure pins correctly for the kernel?
Hmmm seems risky to me.
> The point being, muxing up pins even when not needed(config switched
> off) has no real benefit - in this case albeit, the default mux was
> causing a bug.
> pinctrl IMHO should be considered as any other resource, if it is not
> mandatory for boot, and needed only for a device functionality when
> probed, it should done there only.
>
> just my 2 cents.
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-- 
------------------
Dan Murphy

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