On 2019-09-30 04:43, Biwen Li wrote:
>>
>> On 2019-09-29 12:36, Biwen Li wrote:
>>> On some Layerscape boards like LS2085ARDB and LS2088ARDB, input
>>> pull-up resistors on PCA954x MUX device are missing on board, So, if
>>> MUX are disabled after powered-on, input lines will float leading to
>>> i
>
> Hello Biwen,
>
> > + /* Errata ID E-00013 on board LS2088ARDB and LS2088ARDB:
> > +* The point here is that you must not disable a mux if there
> > +* are no pullups on the input or you mess up the I2C. This
> > +* needs to be put into the DTS really as the kerne
>
> On 2019-09-29 12:36, Biwen Li wrote:
> > On some Layerscape boards like LS2085ARDB and LS2088ARDB, input
> > pull-up resistors on PCA954x MUX device are missing on board, So, if
> > MUX are disabled after powered-on, input lines will float leading to
> > incorrect functionality.
>
> Hi!
>
>
On 2019-09-29 12:36, Biwen Li wrote:
> On some Layerscape boards like LS2085ARDB and LS2088ARDB,
> input pull-up resistors on PCA954x MUX device are missing on board,
> So, if MUX are disabled after powered-on, input lines will float
> leading to incorrect functionality.
Hi!
Are you saying that t
Hello Biwen,
> + /* Errata ID E-00013 on board LS2088ARDB and LS2088ARDB:
> +* The point here is that you must not disable a mux if there
> +* are no pullups on the input or you mess up the I2C. This
> +* needs to be put into the DTS really as the kernel cannot
> +
On some Layerscape boards like LS2085ARDB and LS2088ARDB,
input pull-up resistors on PCA954x MUX device are missing on board,
So, if MUX are disabled after powered-on, input lines will float
leading to incorrect functionality.
Hence, PCA954x MUX device should never be turned-off after
power-on.
A
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