Hello,
I was trying to play with SPI overlay but without success. *I had it
working on 3.8 kernel but with 4.1 it fails.*
Device is created in */dev* but no real communication on board.
It does not work with mine dtbo file or even with precompiled one
(BB-SPIDEV0).
*dmesg *reports no errors:
> [ 89.102860] bone_capemgr bone_capemgr: part_number 'BB-SPIDEV0',
>> version 'N/A'
>
> [ 89.102911] bone_capemgr bone_capemgr: slot #4: override
>
> [ 89.102938] bone_capemgr bone_capemgr: Using override eeprom data at
>> slot 4
>
> [ 89.102966] bone_capemgr bone_capemgr: slot #4: 'Override Board
>> Name,00A0,Override Manuf,BB-SPIDEV0'
>
> [ 89.124965] bone_capemgr bone_capemgr: slot #4: dtbo
>> 'BB-SPIDEV0-00A0.dtbo' loaded; overlay id #0
>
>
>
*kernel*: *Linux beaglebone 4.1.15-ti-rt-r43 #1 SMP PREEMPT RT Thu Jan 21
20:13:58 UTC 2016*
*image*: *bone-debian-8.3-lxqt-4gb-armhf-2016-01-24-4gb.img*
*dtc*: *Version: DTC 1.4.1-g1e75ebc9*
Mine edited dts file i was trying it with:
/dts-v1/;
>
/plugin/;
> / {
compatible = "ti,beaglebone", "ti,beaglebone-black", "ti,beaglebone-green";
> /* identification */
part-number = "BB-SPIDEV0";
version = "00A0";
> /* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P9.17", /* spi0_cs0 */
"P9.18", /* spi0_d1 */
"P9.21", /* spi0_d0 */
"P9.22", /* spi0_sclk */
/* the hardware ip uses */
"spi0";
> fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
/* default state has all gpios released and mode set to uart1 */
bb_spi0_pins: pinmux_bb_spi0_pins {
pinctrl-single,pins = <
0x150 0x30 /* spi0_sclk.spi0_sclk, INPUT_PULLUP | MODE0 */
0x154 0x10 /* spi0_d0.spi0_d0, INPUT_PULLUP | MODE0 */
0x158 0x30 /* spi0_d1.spi0_d1, OUTPUT_PULLUP | MODE0 */
0x15c 0x10 /* spi0_cs0.spi0_cs0, OUTPUT_PULLUP | MODE0 */
>;
};
};
};
> fragment@1 {
target = <&spi0>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
> status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&bb_spi0_pins>;
ti,pio-mode; /* disable dma when used as an overlay, dma gets stuck at 160
> bits... */
ti,pindir-d0-out-d1-in = <1>;
channel@0 {
#address-cells = <1>;
#size-cells = <0>;
> compatible = "spidev";
> reg = <0>;
spi-max-frequency = <16000000>;
spi-cpha;
};
> channel@1 {
#address-cells = <1>;
#size-cells = <0>;
> compatible = "spidev";
> reg = <1>;
spi-max-frequency = <16000000>;
};
};
};
};
--
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