Hi,
I'm trying to connect a CAN SPI controller (MCP2515) to my BBB and i'm
experiencing some problems when i enable the SPI interface with device
tree. It is being correctly initiated and the device is also recognized but
I get the following messages on dmesg after enabling the dtbo file:
[ 76.488938] mcp251x spi1.0: mode 0, irq 261, awake 1, clkout 1,
oscillator freq 16000000
[ 77.490240] mcp251x spi1.0: MCP251x didn't enter in conf mode after reset
[ 77.501439] mcp251x spi1.0: hw probe failed
[ 77.501488] mcp251x spi1.0: probe failed
*My dts file:*
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
bone_spi1_pins: pinmux_bone_spi1_pins {
pinctrl-single,pins = <
0x190 0x33 /* mcasp0_aclkx.spi1_sclk, RX_ENABLED | PULLUP |
MODE3 */
0x194 0x33 /* mcasp0_fsx.spi1_d0, RX_ENABLED | PULLUP |
MODE3 */
0x198 0x13 /* mcasp0_axr0.spi1_d1, OUTPUT_PULLUP | MODE3 */
0x19c 0x13 /* mcasp0_ahclkr.spi1_cs0, OUTPUT_PULLUP | MODE3
*/
>;
};
bone_mcp2515_0_pins: pinmux_bone_0_mcp2515_pins {
pinctrl-single,pins = <
0x1AC 0x37 /* mcasp0_ahclkx.gpio3_21, RX_ENABLED |
PULLUP | MODE7 */
>;
};
mcp251x_clock: mcp2515 {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <16000000>;
};
};
};
fragment@1 {
target = <&spi1>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&bone_spi1_pins>;
cs-gpios = <&gpio4 17 0>, <&gpio1 7 0>;
mcp2515@0 {
compatible = "microchip,mcp2515";
reg = <0>; /* cs0 */
mode = <0>;
spi-max-frequency = <10000000>;
clocks = <&mcp251x_clock>;
pinctrl-names = "default";
pinctrl-0 = <&bone_mcp2515_0_pins>;
interrupt-parent = <&gpio4>;
interrupts = <21>;
mcp251x,oscillator-frequency = <16000000>;
mcp251x,irq-gpios = <&gpio4 21 0>;
mcp251x,stay-awake = <1>;
mcp251x,enable-clkout = <1>;
};
};
};
Can anyone help me finding what is missing?
Thank you.
Regards,
Duarte
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