Re: spi-imx: add support for single burst mode (8,16,32)

[Chris Ruehl <chris.ruehl-CR359r9tUDPXPF5Rlphj1Q@public.gmane.org>]

On Tuesday, May 31, 2016 07:06 PM, Sascha Hauer wrote:
> On Tue, May 31, 2016 at 07:43:37AM -0300, Fabio Estevam wrote:
>> [Adding Sascha and Anton in Cc]
>>
>> On Tue, May 31, 2016 at 6:40 AM, Chris Ruehl <chris.ruehl-CR359r9tUDPXPF5Rlphj1Q@public.gmane.org> wrote:
>>> Hi,
>>>
>>> as imx6 using multiple burst to send data to spi slaves and drop the
>>> chipselect between the words by default my sensor NXP MPL115A1 wasn't
>>> working.
>
> I generally recommend to use GPIO Chip selects. The SPI controller has
> its own ideas when to assert the chipselects which is hard to match (if
> possible at all) with what Linux SPI expects. See the cs-gpios device
> tree property.
>
> Sascha

Sascha that's a good approach to fight this problem, if you have the
choice. Sadly my hardware design is finished and I can only switch to
a gpio by run wires on the finished PCB.. and that's not what I want.

With the single burst mode patch, the logic analyser shows a very nice and
and clean and accurate chipselect clock MOSI and MISO.

Chris
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