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.
> 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
Matthijs
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