Re: [PATCH v6 2/5] spi: spi-imx: add support for SPI_MOSI_IDLE_LOW mode bit

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Am Mi., 24. Mai 2023 um 11:47 Uhr schrieb Frieder Schrempf
<frieder.schrempf@xxxxxxxxxx>:
>
> On 24.05.23 11:19, Boerge Struempfel wrote:
> > By default, the spi-imx controller pulls the mosi line high, whenever it
> > is idle. This behaviour can be inverted per CS by setting the
> > corresponding DATA_CTL bit in the config register of the controller.
> >
> > Also, since the controller mode-bits have to be touched anyways, the
> > SPI_CPOL and SPI_CPHA are replaced by the combined SPI_MODE_X_MASK flag.
> >
> > Signed-off-by: Boerge Struempfel <boerge.struempfel@xxxxxxxxx>
>
> Thanks for working on this! We used a similar downstream patch for
> driving NeoPixels with i.MX. I'm happy to see a proper upstream solution.
>

Thanks for your reply. I'm glad to see that there is an interest for this
and I'm not the only one, who is working with this.

> I also have this Python module [1] around for using spidev to drive the
> LEDs. It would be nice to see support for SPI_MOSI_IDLE_LOW in py-spidev
> [2] so we could use it there. Though the latter looks a bit like it is
> not properly maintained anymore.

The python modules looks interesting.

FYI: there is already another patch by Chuanhong Guo on the mailing
list, which implements a proper driver for neopixel leds. It also allows
to add them via DT and access them via sys-fs. It might be an
interesting upstream alternative for your python module if it gets
accepted.

https://lore.kernel.org/lkml/20221212045558.69602-1-gch981213@xxxxxxxxx/

>
> [1] https://github.com/fschrempf/py-neopixel-spidev
> [2] https://github.com/doceme/py-spidev
>
> Reviewed-by: Frieder Schrempf <frieder.schrempf@xxxxxxxxxx>

--
Kind Regards,
Börge Strümpfel




[Index of Archives]     [Linux Kernel]     [Linux ARM (vger)]     [Linux ARM MSM]     [Linux Omap]     [Linux Arm]     [Linux Tegra]     [Fedora ARM]     [Linux for Samsung SOC]     [eCos]     [Linux Fastboot]     [Gcc Help]     [Git]     [DCCP]     [IETF Announce]     [Security]     [Linux MIPS]     [Yosemite Campsites]

  Powered by Linux