I am trying to get MAX14830
<https://www.maximintegrated.com/en/products/interface/controllers-expanders/MAX14830.html>
to work with beaglebone black using max310x
<https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/serial/maxim%2Cmax310x.txt>driver
over spi. With my dts, the overlay gets loaded, but i dont get any new
devices in /dev. With my oscilloscope i can see that nothing happens and
that CS is low (Active low, so something is wrong). I dont understand what
I am doing wrong. I have the chip connected to a 4Mhz external crystal.
Output from dmesg after loading manually:
[ 212.403551] bone_capemgr bone_capemgr: part_number 'BB-MAX14830-01',
version 'N/A'
[ 212.411232] bone_capemgr bone_capemgr: slot #6: override
[ 212.416720] bone_capemgr bone_capemgr: Using override eeprom data at
slot 6
[ 212.423786] bone_capemgr bone_capemgr: slot #6: 'Override Board
Name,00A0,Override Manuf,BB-MAX14830-01'
[ 212.461917] bone_capemgr bone_capemgr: slot #6: dtbo
'BB-MAX14830-01-00A0.dtbo' loaded; overlay id #0
modalias:
debian@arm:~$ cat /sys/bus/spi/devices/*/modalias
spi:max14830
DTS:
/dts-v1/;
/plugin/;
/ {
compatible = "ti,beaglebone", "ti,beaglebone-black";
part-number = "BB-MAX14830-01";
/* state the resources this cape uses */
exclusive-use =
/* the pin header uses */
"P9.25", /* spi irq: gpio3_21 */
"P9.31", /* spi: spi1_sclk */
"P9.29", /* spi: spi1_d0 */
"P9.30", /* spi: spi1_d1 */
"P9.28", /* spi: spi1_cs0 */
/* the hardware IP uses */
"gpio3_21",
"spi1";
fragment@0 {
target = <&am33xx_pinmux>;
__overlay__ {
bone_14830_spi1_pins: pinmux_bone_14830_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_14830_pins: pinmux_bone_14830_pins {
pinctrl-single,pins = <
0x1ac 0x37 /*
mcasp0_ahclkx.gpio3_21, RX_ENABLED | PULLUP | MODE7 */
>;
};
};
};
fragment@1 {
target = <&spi1>;
__overlay__ {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
pinctrl-names = "default";
pinctrl-0 = <&bone_14830_spi1_pins>;
max14830@0 {
compatible = "maxim,max14830";
reg = <0>; /* cs0 */
mode=<0>;
spi-max-frequency=<1000000>;
pinctrl-names="default";
pinctrl-0 = <&bone_14830_pins>;
clocks=<&clk4m>;
clock-names="xtal";
interrupt-parent = <&gpio3>;
interrupts = <21 2>; // Edge Falling
clk4m: clk4m@10 {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <4000000>;
};
};
};
};
};
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