Hello,
I am creating a custom cape which uses SPI1 with both cs0 and cs1 and uses
multiple GPIO pins including 8.07 mapped as GPIO pin.. My prototype has
been working without issues but I recently noticed a curious issue while
parsing dmesg:
[ 10.775173] pinctrl-single 44e10800.pinmux: pin 44e10890.0 already
requested by ocp:gpio_helper; cannot claim for 481a0000.spi
[ 10.786802] pinctrl-single 44e10800.pinmux: pin-36 (481a0000.spi) status
-22
[ 10.793955] pinctrl-single 44e10800.pinmux: could not request pin 36
(44e10890.0) from group MYTEST_GPIO on device pinctrl-single
[ 10.805516] omap2_mcspi 481a0000.spi: Error applying setting, reverse
things back
where MYTEST_GPIO is:
__overlay__ {
my_example: MYTEST_GPIO {
pinctrl-single,pins = <
0x090 0x07 // P8_07 this seems to be the
offending pin
0x094 0x07 // P8_08
// few more pins not shown here
>;
};
};
The SPI overlay is:
bb_spi1_pins: pinmux_bb_spi1_pins {
pinctrl-single,pins = <
0x190 0x33 /* spi1_sclk, INPUT_PULLUP | MODE3 */
0x194 0x13 /* spi1_d0, OUTPUT_PULLUP | MODE3 */
0x19c 0x13 /* spi1_cs0, OUTPUT_PULLUP | MODE3 */
0x164 0x12 /* spi1_cs1 OUTPUT_PULLUP | MODE2 */
>;
};
I am not defining the use of a timer in the overlays. I understand SPI
needs to generate a clock in master mode, though I am not sure if one of
the timers is used for this purpose. However, I am not sure I understand
why is the pin 8.07 physically required especially when I am mapping it as
a GPIO pin.
Some system information if it helps:
debian@beaglebone:~$ uname -a
Linux beaglebone 4.4.47-ti-r87 #1 SMP Mon Feb 6 22:21:49 UTC 2017 armv7l
GNU/Linux
debian@beaglebone:~$ cat /sys/devices/platform/bone_capemgr/slots
0: P---L- 0 4D 4.3 LCD CAPE- 4DCAPE-43T ,00A1,4D SYSTEMS
,BB-BONE-LCD4-01
1: PF---- -1
2: PF---- -1
3: PF---- -1
4: P-O-L- 1 Override Board Name,00A0,Override Manuf,MYTEST-SPIDEV1
5: P-O-L- 2 Override Board Name,00A0,Override Manuf,MYTEST-GPIO
Any thoughts would be appreciated..
Thanks
Gaurav
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