Re: Suggestion Needed on Demuxer to Select Slave Devices

["Lad, Prabhakar" <prabhakar.csengg@xxxxxxxxx>]

Hi Geert,

Seems like my earlier reply didn’t make to the mailing list, so
replying back again.

On Tue, Aug 22, 2017 at 12:56 PM, Geert Uytterhoeven
<geert@xxxxxxxxxxxxxx> wrote:
> Hi Lad,
>
> On Tue, Aug 22, 2017 at 1:06 PM, Lad, Prabhakar
> <prabhakar.csengg@xxxxxxxxx> wrote:
>> I am writing a Linux SPI slave driver, on the latest kernel, and
>> wanted a suggestion on how the driver could fit in the latest kernel
>> with DT.
>>
>> I have SPI controller which is connected to decoder [1], the SPI
>> controller has 2 chip selects, but only one (cs0) is connected to the
>> decoder.
>
> ... to e.g. G2A of the decoder?
>
the chip select is connected to the G1, which is active high, G2A/G2B
are grounded [1].

>> The decoder has 8 slave devices connected to it, which can be can be
>> selected by gpios from the muxer.
>
> So the A/B/C inputs of the decoder are connected to GPIOs?
>
Yes A/B/C are the inputs to the decoder which are GPIO's.

[1] https://pasteboard.co/GGXwYM8S.jpg

Cheers,
--Prabhakar
--
To unsubscribe from this list: send the line "unsubscribe linux-spi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html