2020년 7월 20일 월요일 오전 4시 10분 40초 UTC+9, Raul Rathmann 님의 말:
>
>
> Hi,
>
> I've got a custom board where I need/want to use the MCSPI3 CS0, CS2 and
> CS3 hw lines for SPI.
>
> When I configure and enable mcspi3 in a custom DTS for the Linux image,
> with I get the following message viewable with dmesg:
> [ 1.189920] omap2_mcspi 480b8000.spi: chipselect 0 already in use
> [ 1.196085] spi_master spi2: spi_device register error
> /ocp/spi@480b8000/channel@0
> [ 1.203721] spi_master spi2: Failed to create SPI device for
> /ocp/spi@480b8000/channel@0
>
> So, channel 0 seems to be conflicting with some other driver or usage.
>
> I finally figured out that the "am5729-beagleboneai.dts" file has a
> reference to mcspi3:
> &mcspi3 {
> status = "okay";
> ti,pindir-d0-out-d1-in;
>
> sn65hvs882: sn65hvs882@0 {
> compatible = "pisosr-gpio";
> gpio-controller;
> #gpio-cells = <2>;
>
> reg = <0>;
> spi-max-frequency = <1000000>;
> spi-cpol;
> };
> };
>
> My question is can I disable/override this usage?
>
> I don't know the system purpose of the "pisosr-gpio"/sn65hvs882 device and
> what the effect will be if Linux access is disabled. Since I'll have a
> custom device on linux spidev2.0, I don't want some other part of the
> system trying to access that SPI bus/channel and causing problems with my
> device.
>
> Thanks for any insights.
>
> Raul
>
>
>
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