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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