On Fri, Feb 12, 2016 at 10:35 AM, Matthijs van Duin
<[email protected]> wrote:
> On 12 February 2016 at 16:37, Robert Nelson <[email protected]> wrote:
>>
>> So, P9.15, gpmc_a0 is setup as:
>>
>> {OFFSET(gpmc_ad0), (MODE(1) | RXACTIVE | PULLUP_EN)}, /* MMC1_DAT0 */
>
>
> Those are different pins. The only useful purpose of pin 16 ("gpmc_a0") on a
> BBB is as pwm 1 tripzone input.
>
> mmc1 pins are obviously not double-mapped with anything.
/* P9.15 */
{OFFSET(gpmc_a0), MODE(0) | PULLUDDIS},
{OFFSET(gpmc_csn3), (MODE(3) | RXACTIVE | PULLUP_EN)},
>> so, gpmc_csn3 (which is also used by the bbgw as mmc2_cmd)
>
>
> mmc2 cmd is indeed the only useful use of the other pin of the pair.
>
> I'm thinking just disable the pull of pin 16 ("gpmc_a0"). The pull of the
> other pin should already take care of things.
>
> In general in DTs I would also recommend disabling (gpio input, rx disabled,
> no pull) the "other pin" of any pin-pair whenever one is in use, but at a
> minimum they should avoid a pull conflict. There are three such pairs, see
> P9 tab of my pins spreadsheet -> https://goo.gl/Jkcg0w
Yeah, P9.41/42..
We do separate them out:
https://github.com/beagleboard/bb.org-overlays/blob/master/include/dt-bindings/board/am335x-bbw-bbb-base.h#L96-L101
I'll have to fix up:
bone_eqep0-00A0.dts
as it uses: BONE_P9_41B
But doesn't unset P9_41A
Regards,
--
Robert Nelson
https://rcn-ee.com/
--
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