linux-kernel - Re: [PATCH] pinctrl: dra: dt-bindings: Fix pull enable/disable

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Date:	Tue, 22 Jul 2014 13:31:43 -0500
From:	Nishanth Menon <nm@...com>
To:	<balbi@...com>, Tony Lindgren <tony@...mide.com>
CC:	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Benoit Cousson <bcousson@...libre.com>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] pinctrl: dra: dt-bindings: Fix pull enable/disable

On 07/22/2014 11:47 AM, Felipe Balbi wrote:
> On Tue, Jul 22, 2014 at 10:39:54AM -0500, Nishanth Menon wrote:
>> The DRA74/72 control module pins have a weak pull up and pull down.
>> This is configured by bit offset 17. if BIT(17) is 1, a pull up is
>> selected, else a pull down is selected.
>>
>> However, this pull resisstor is applied based on BIT(16) -
>> PULLUDENABLE - if BIT(18) is *0*, then pull as defined in BIT(17) is
>> applied, else no weak pulls are applied. We defined this in reverse.
>>
>> Reference: Table 18-5 (Description of the pad configuration register
>> bits) in Technical Reference Manual Revision (DRA74x revision Q:
>> SPRUHI2Q Revised June 2014 and DRA72x revision F: SPRUHP2F - Revised
>> June 2014)
>>
>> Fixes: 6e58b8f1daaf1a ("ARM: dts: DRA7: Add the dts files for dra7 SoC and dra7-evm board")
>> Signed-off-by: Nishanth Menon <nm@...com>
>> ---
> 
> Tested on an upcoming board.
> 
> Tested-by: Felipe Balbi <balbi@...com>
> Acked-by: Felipe Balbi <balbi@...com>
> 
> 
Felipe,
Thanks.

Tony,

If you could consider this for the rc cycle it might be great(as well
as for stable). The pull direction error can cause all kinds of
Pull-down Vs Pull-Up contention with severe risk for certain IP
reliability.

-- 
Regards,
Nishanth Menon
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