Op 5 jul. 2014, om 23:16 heeft bruce bushby <[email protected]> het
volgende geschreven:
>
> Looking much better:
> # ls -l /dev/*spi*
> crw------- 1 root root 153, 0 Jan 10 13:51 /dev/spidev0.0
> #
>
>
> I added an spidev childnode to my spi1 node like so:
>
> spi1: spi@01c06000 {
> pinctrl-names = "default";
> pinctrl-0 = <&spi1_pins_a>;
> status = "okay";
> spidev@0 {
> compatible = "linux,spidev";
> reg = <0>;
> spi-max-frequency = <1000000>;
> };
> };
>
>
>
> Rebuild, reboot and what would you know...... I have " /dev/spidev0.0"
Note that spidev is a userspace 'driver' and a hack, not something you'd use
longterm.
> Really can't thank you guys enough for all the help, much appreciated!!!!
>
> next stop.....connecting an SPI device ....hopefully without too many sparks
> :)
>
> I'm connecting an MPU9250:
> http://www.drotek.fr/shop/421-1256-large_dm/mpu9250-gyro-accelerometer-magnetometer.jpg
>
> Guessing the "compatible" string will just be spi?
iirc the MPU6050 has a driver already, to get that working replace the spidev
entry with the 6050 one.
regards,
Koen
>
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> On Sat, Jul 5, 2014 at 10:04 PM, bruce bushby <[email protected]> wrote:
> Well Jon kindly pointed me to his repo which is confirmed to have spidev
> working on A20. I used his repo and his .config file .....with the same
> results ...which I guess is a good thing as it means my previous attempts
> were probably all working and I just need to find what crucial step I am
> missing.
>
> Here you can see both spi kernel processes running
> #
> # ps -ef | grep -i spi
> 46 root [spi0]
> 47 root [spi1]
> 152 root grep -i spi
> #
>
>
> I changed spidev to be a kernel module....and it loads without any problems
> # lsmod
> Module Size Used by Not tainted
> spidev 5471 0
> #
>
>
>
> The /sys filesystem is aware of the spi devices:
> # find /sys -iname "*spi*"
> /sys/bus/spi
> /sys/bus/spi/drivers/spidev
> /sys/bus/platform/devices/1c06000.spi
> /sys/bus/platform/devices/1c17000.spi
> /sys/bus/platform/drivers/sun4i-spi
> /sys/bus/platform/drivers/sun4i-spi/1c06000.spi
> /sys/bus/platform/drivers/sun4i-spi/1c17000.spi
> /sys/bus/platform/drivers/sun6i-spi
> /sys/devices/soc@01c00000/1c06000.spi
> /sys/devices/soc@01c00000/1c06000.spi/spi_master
> /sys/devices/soc@01c00000/1c06000.spi/spi_master/spi0
> /sys/devices/soc@01c00000/1c17000.spi
> /sys/devices/soc@01c00000/1c17000.spi/spi_master
> /sys/devices/soc@01c00000/1c17000.spi/spi_master/spi1
> /sys/class/spi_master
> /sys/class/spi_master/spi0
> /sys/class/spi_master/spi1
> /sys/class/spidev
> /sys/firmware/devicetree/base/soc@01c00000/spi@01c05000
> /sys/firmware/devicetree/base/soc@01c00000/spi@01c06000
> /sys/firmware/devicetree/base/soc@01c00000/spi@01c17000
> /sys/firmware/devicetree/base/soc@01c00000/spi@01c1f000
> /sys/firmware/devicetree/base/soc@01c00000/pinctrl@01c20800/spi0@0
> /sys/firmware/devicetree/base/soc@01c00000/pinctrl@01c20800/spi1@0
> /sys/firmware/devicetree/base/soc@01c00000/pinctrl@01c20800/spi2@0
> /sys/firmware/devicetree/base/aliases/spi0
> /sys/firmware/devicetree/base/aliases/spi1
> /sys/module/spidev
> /sys/module/spidev/drivers/spi:spidev
> #
>
> I have added "udev" (eudev) to my build
> #
> # /etc/init.d/S10udev stop
> # /etc/init.d/S10udev start
> Populating /dev using udev: [ 1242.412281] udevd[164]: starting version 1.7
> done
> #
>
>
>
> Wondering if I need:
> 1. An actual spi device connected
> 2. An "spiddev node" ....or "spidev" as a "childnode" of spi1
>
>
> Also noticed I don't see any SPI messages from dmesg....which I guess is a
> hint I'll follow soon
>
>
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>
> On Sat, Jul 5, 2014 at 8:59 PM, Maxime Ripard
> <[email protected]> wrote:
> On Sat, Jul 05, 2014 at 02:14:44PM +0100, bruce bushby wrote:
> > update: I added spi0 to my dts file and everything appears to build and
> > boot smoothly.....however I still don't see anything under "/dev/*spi*"
> > ......perhaps something simple as a missing udev rule or mknod script. I'm
> > not sure who or what should create the "/dev/*spi*" device(s).
>
> /dev/spi* is handled by a driver called spidev. If this driver is not
> both loaded and probed, you'll never see a /dev/spi* file, even though
> the controller driver is working fine.
>
> --
> Maxime Ripard, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com
>
>
>
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