Cannot enable magnetometer on BeagleBone Blue via kernel driver

[jadonk]

Please set CONFIG_AK8975=m

Tested with:

• https://gist.github.com/jadonk/99288dd94fb16b6c764c7c81c7735dd0
• https://gist.github.com/jadonk/bcc5f1e65f39406800c3c32cb81290b1

debian@beaglebone:/var/lib/cloud9$ dmesg | grep ak
[    0.412403] hw-breakpoint: debug architecture 0x4 unsupported.                                                       
[   39.936608] ak8975 3-000c: mounting matrix not found: using identity...                                              
[   39.936658] ak8975 3-000c: 3-000c supply vdd not found, using dummy regulator                                        
[   39.936818] ak8975 3-000c: Linked as a consumer to regulator.0                                                       
[   39.936842] ak8975 3-000c: 3-000c supply vid not found, using dummy regulator                                        
debian@beaglebone:/var/lib/cloud9$ cat /sys/bus/iio/devices/iio\:device2/in_magn_x_raw 
-24
debian@beaglebone:/var/lib/cloud9$ 

[RobertCNelson]

@jadonk but it is enabled.. maybe something else broken with the in -kernel one?

https://github.com/beagleboard/linux/blob/4.19/arch/arm/configs/bb.org_defconfig#L2163

Regards,

[RobertCNelson]

For reference, here's what we have on teh blue for mainline (it got removed for roboticcape library..)

	mpu9250@68 {
			compatible = "invensense,mpu9250";
			reg = <0x68>;
			interrupt-parent = <&gpio3>;
			interrupts = <21 IRQ_TYPE_EDGE_RISING>;
			i2c-gate {
				#address-cells = <1>;
				#size-cells = <0>;
				ax8975@c {
					compatible = "ak,ak8975";
					reg = <0x0c>;
				};
			};
		};
	
		pressure@76 {
			compatible = "bosch,bmp280";
			reg = <0x76>;
		};

[jadonk]

compatible = "ak,ak8975";

no longer matches. remove "ak" or add the full company name.

[jadonk]

I'm so confused!

I had these overlays working yesterday before I updated my kernel.

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.19.50-ti-r22 (voodoo@x2-am57xx-beagle-x15-2gb) (gcc version 8.3.0 (Debian 8.3.0-6)) #1buster SMP PREEMPT Mon Jul 8 22:23:19 UTC 2019
[    0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] OF: fdt: Machine model: TI AM335x BeagleBone Blue
[    0.000000] Memory policy: Data cache writeback
[    0.000000] efi: Getting EFI parameters from FDT:
[    0.000000] efi: UEFI not found.
[    0.000000] cma: Reserved 48 MiB at 0x9c800000
[    0.000000] On node 0 totalpages: 130560
[    0.000000]   Normal zone: 1148 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 130560 pages, LIFO batch:31
[    0.000000] CPU: All CPU(s) started in SVC mode.
[    0.000000] AM335X ES2.1 (sgx neon)
[    0.000000] random: get_random_bytes called from start_kernel+0xa0/0x508 with crng_init=0
[    0.000000] percpu: Embedded 18 pages/cpu s43084 r8192 d22452 u73728
[    0.000000] pcpu-alloc: s43084 r8192 d22452 u73728 alloc=18*4096
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 129412
[    0.000000] Kernel command line: console=ttyO0,115200n8 bone_capemgr.uboot_capemgr_enabled=1 root=/dev/mmcblk1p1 ro rootfstype=ext4 rootwait coherent_pool=1M net.ifnames=0 rng_core.default_quality=100 cape_universal=enable quiet
[    0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
[    0.000000] Memory: 437388K/522240K available (13312K kernel code, 1152K rwdata, 4432K rodata, 1024K init, 349K bss, 35700K reserved, 49152K cma-reserved, 0K highmem)
[    0.000000] Virtual kernel memory layout:
                   vector  : 0xffff0000 - 0xffff1000   (   4 kB)
                   fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
                   vmalloc : 0xe0000000 - 0xff800000   ( 504 MB)
                   lowmem  : 0xc0000000 - 0xdfe00000   ( 510 MB)
                   pkmap   : 0xbfe00000 - 0xc0000000   (   2 MB)
                   modules : 0xbf000000 - 0xbfe00000   (  14 MB)
                     .text : 0x(ptrval) - 0x(ptrval)   (14304 kB)
                     .init : 0x(ptrval) - 0x(ptrval)   (1024 kB)
                     .data : 0x(ptrval) - 0x(ptrval)   (1153 kB)
                      .bss : 0x(ptrval) - 0x(ptrval)   ( 350 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] ftrace: allocating 42466 entries in 125 pages
[    0.000000] rcu: Preemptible hierarchical RCU implementation.
[    0.000000] rcu: 	RCU restricting CPUs from NR_CPUS=2 to nr_cpu_ids=1.
[    0.000000] 	Tasks RCU enabled.
[    0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
[    0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[    0.000000] IRQ: Found an INTC at 0x(ptrval) (revision 5.0) with 128 interrupts
[    0.000000] OMAP clockevent source: timer2 at 24000000 Hz
[    0.000020] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[    0.000039] clocksource: timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[    0.000051] OMAP clocksource: timer1 at 24000000 Hz
[    0.001600] timer_probe: no matching timers found
[    0.001944] Console: colour dummy device 80x30
[    0.001975] WARNING: Your 'console=ttyO0' has been replaced by 'ttyS0'
[    0.001979] This ensures that you still see kernel messages. Please
[    0.001984] update your kernel commandline.
[    0.002044] Calibrating delay loop... 995.32 BogoMIPS (lpj=1990656)
[    0.021473] pid_max: default: 32768 minimum: 301
[    0.021760] Security Framework initialized
[    0.021773] Yama: becoming mindful.
[    0.021922] AppArmor: AppArmor initialized
[    0.022031] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.022043] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.023148] CPU: Testing write buffer coherency: ok
[    0.023212] CPU0: Spectre v2: using BPIALL workaround
[    0.023702] CPU0: thread -1, cpu 0, socket -1, mpidr 0
[    0.045566] Setting up static identity map for 0x80100000 - 0x80100060
[    0.053477] rcu: Hierarchical SRCU implementation.
[    0.064749] EFI services will not be available.
[    0.069486] smp: Bringing up secondary CPUs ...
[    0.069500] smp: Brought up 1 node, 1 CPU
[    0.069511] SMP: Total of 1 processors activated (995.32 BogoMIPS).
[    0.069518] CPU: All CPU(s) started in SVC mode.
[    0.071251] devtmpfs: initialized
[    0.097929] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
[    0.098583] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[    0.098607] futex hash table entries: 256 (order: 2, 16384 bytes)
[    0.102572] xor: measuring software checksum speed
[    0.141459]    arm4regs  :  1217.000 MB/sec
[    0.181449]    8regs     :  1091.000 MB/sec
[    0.221449]    32regs    :  1088.000 MB/sec
[    0.261447]    neon      :  1673.000 MB/sec
[    0.261454] xor: using function: neon (1673.000 MB/sec)
[    0.261472] pinctrl core: initialized pinctrl subsystem
[    0.262843] NET: Registered protocol family 16
[    0.268989] DMA: preallocated 1024 KiB pool for atomic coherent allocations
[    0.344510] l4_wkup_cm:clk:0010:0: failed to disable
[    0.384698] audit: initializing netlink subsys (disabled)
[    0.386110] cpuidle: using governor menu
[    0.389573] audit: type=2000 audit(0.380:1): state=initialized audit_enabled=0 res=1
[    0.394377] OMAP GPIO hardware version 0.1
[    0.397343] GPIO line 106 (LS_BUF_EN) hogged as output/high
[    0.413618] No ATAGs?
[    0.413638] hw-breakpoint: debug architecture 0x4 unsupported.
[    0.415044] omap4_sram_init:Unable to allocate sram needed to handle errata I688
[    0.415056] omap4_sram_init:Unable to get sram pool needed to handle errata I688
[    0.441629] raid6: using algorithm neonx8 gen() 0 MB/s
[    0.441642] raid6: .... xor() 0 MB/s, rmw enabled
[    0.441649] raid6: using neon recovery algorithm
[    0.449531] edma 49000000.edma: TI EDMA DMA engine driver
[    0.455432] SCSI subsystem initialized
[    0.457619] libata version 3.00 loaded.
[    0.457932] usbcore: registered new interface driver usbfs
[    0.457995] usbcore: registered new interface driver hub
[    0.458124] usbcore: registered new device driver usb
[    0.459256] media: Linux media interface: v0.10
[    0.459302] videodev: Linux video capture interface: v2.00
[    0.459434] pps_core: LinuxPPS API ver. 1 registered
[    0.459440] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <[email protected]>
[    0.459460] PTP clock support registered
[    0.460099] omap-mailbox 480c8000.mailbox: omap mailbox rev 0x400
[    0.461856] Advanced Linux Sound Architecture Driver Initialized.
[    0.462679] NetLabel: Initializing
[    0.462691] NetLabel:  domain hash size = 128
[    0.462695] NetLabel:  protocols = UNLABELED CIPSOv4 CALIPSO
[    0.462799] NetLabel:  unlabeled traffic allowed by default
[    0.463930] clocksource: Switched to clocksource timer1
[    0.627723] VFS: Disk quotas dquot_6.6.0
[    0.627841] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[    0.628844] AppArmor: AppArmor Filesystem Enabled
[    0.641546] NET: Registered protocol family 2
[    0.642564] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes)
[    0.642599] TCP established hash table entries: 4096 (order: 2, 16384 bytes)
[    0.642642] TCP bind hash table entries: 4096 (order: 3, 32768 bytes)
[    0.642699] TCP: Hash tables configured (established 4096 bind 4096)
[    0.642830] UDP hash table entries: 256 (order: 1, 8192 bytes)
[    0.642853] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[    0.643209] NET: Registered protocol family 1
[    0.656498] RPC: Registered named UNIX socket transport module.
[    0.656509] RPC: Registered udp transport module.
[    0.656514] RPC: Registered tcp transport module.
[    0.656519] RPC: Registered tcp NFSv4.1 backchannel transport module.
[    0.657256] Unpacking initramfs...
[    1.015993] random: fast init done
[    1.090780] Freeing initrd memory: 7584K
[    1.091692] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 counters available
[    1.094715] Initialise system trusted keyrings
[    1.095136] workingset: timestamp_bits=14 max_order=17 bucket_order=3
[    1.102543] zbud: loaded
[    1.110074] NFS: Registering the id_resolver key type
[    1.110117] Key type id_resolver registered
[    1.110124] Key type id_legacy registered
[    1.110143] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[    1.110507] fuse init (API version 7.27)
[    1.121030] Key type asymmetric registered
[    1.121044] Asymmetric key parser 'x509' registered
[    1.121142] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 244)
[    1.125507] io scheduler noop registered
[    1.125518] io scheduler deadline registered
[    1.125839] io scheduler cfq registered (default)
[    1.125849] io scheduler mq-deadline registered
[    1.129343] pinctrl-single 44e10800.pinmux: 142 pins, size 568
[    1.140524] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle
[    1.147812] Serial: 8250/16550 driver, 6 ports, IRQ sharing disabled
[    1.151431] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 30, base_baud = 3000000) is a 8250
[    1.168363] console [ttyS0] enabled
[    1.169501] 48022000.serial: ttyS1 at MMIO 0x48022000 (irq = 31, base_baud = 3000000) is a 8250
[    1.170431] 48024000.serial: ttyS2 at MMIO 0x48024000 (irq = 32, base_baud = 3000000) is a 8250
[    1.171403] 481a6000.serial: ttyS3 at MMIO 0x481a6000 (irq = 33, base_baud = 3000000) is a 8250
[    1.172503] 481a8000.serial: ttyS4 at MMIO 0x481a8000 (irq = 34, base_baud = 3000000) is a 8250
[    1.173530] 481aa000.serial: ttyS5 at MMIO 0x481aa000 (irq = 35, base_baud = 3000000) is a 8250
[    1.177142] omap_rng 48310000.rng: Random Number Generator ver. 20
[    1.180493] random: crng init done
[    1.186905] eqep 48300180.eqep: ver. 1.0
[    1.187129] eqep 48300180.eqep: count_mode:0
[    1.187141] eqep 48300180.eqep: invert_qa:1
[    1.187149] eqep 48300180.eqep: invert_qb:1
[    1.187157] eqep 48300180.eqep: invert_qi:0
[    1.187165] eqep 48300180.eqep: invert_qs:0
[    1.187173] eqep 48300180.eqep: swap_inputs:0
[    1.187182] eqep 48300180.eqep: QDECCTL:0x0180
[    1.187190] eqep 48300180.eqep: QPOSINIT:0x00000000
[    1.187197] eqep 48300180.eqep: QPOSMAX:0xffffffff
[    1.187204] eqep 48300180.eqep: QPOSCNT:0x00000000
[    1.187212] eqep 48300180.eqep: omit_interrupt:0
[    1.187219] eqep 48300180.eqep: QEINT:0x0800
[    1.187226] eqep 48300180.eqep: QUPRD:0x05f5e100
[    1.187233] eqep 48300180.eqep: QEPCTL:0x009e write
[    1.187240] eqep 48300180.eqep: QEPCTL:0x009e read
[    1.187270] eqep 48300180.eqep: irq:62, clk_rate:100000000
[    1.187629] eqep 48302180.eqep: ver. 1.0
[    1.187764] eqep 48302180.eqep: count_mode:0
[    1.187772] eqep 48302180.eqep: invert_qa:1
[    1.187780] eqep 48302180.eqep: invert_qb:1
[    1.187788] eqep 48302180.eqep: invert_qi:0
[    1.187796] eqep 48302180.eqep: invert_qs:0
[    1.187804] eqep 48302180.eqep: swap_inputs:0
[    1.187812] eqep 48302180.eqep: QDECCTL:0x0180
[    1.187820] eqep 48302180.eqep: QPOSINIT:0x00000000
[    1.187826] eqep 48302180.eqep: QPOSMAX:0xffffffff
[    1.187833] eqep 48302180.eqep: QPOSCNT:0x00000000
[    1.187841] eqep 48302180.eqep: omit_interrupt:0
[    1.187848] eqep 48302180.eqep: QEINT:0x0800
[    1.187855] eqep 48302180.eqep: QUPRD:0x05f5e100
[    1.187861] eqep 48302180.eqep: QEPCTL:0x009e write
[    1.187868] eqep 48302180.eqep: QEPCTL:0x009e read
[    1.187890] eqep 48302180.eqep: irq:64, clk_rate:100000000
[    1.188302] eqep 48304180.eqep: ver. 1.0
[    1.188453] eqep 48304180.eqep: count_mode:0
[    1.188462] eqep 48304180.eqep: invert_qa:1
[    1.188470] eqep 48304180.eqep: invert_qb:1
[    1.188478] eqep 48304180.eqep: invert_qi:0
[    1.188486] eqep 48304180.eqep: invert_qs:0
[    1.188493] eqep 48304180.eqep: swap_inputs:0
[    1.188501] eqep 48304180.eqep: QDECCTL:0x0180
[    1.188508] eqep 48304180.eqep: QPOSINIT:0x00000000
[    1.188515] eqep 48304180.eqep: QPOSMAX:0xffffffff
[    1.188522] eqep 48304180.eqep: QPOSCNT:0x00000000
[    1.188530] eqep 48304180.eqep: omit_interrupt:0
[    1.188537] eqep 48304180.eqep: QEINT:0x0800
[    1.188544] eqep 48304180.eqep: QUPRD:0x05f5e100
[    1.188551] eqep 48304180.eqep: QEPCTL:0x009e write
[    1.188558] eqep 48304180.eqep: QEPCTL:0x009e read
[    1.188578] eqep 48304180.eqep: irq:66, clk_rate:100000000
[    1.202039] libphy: Fixed MDIO Bus: probed
[    1.205806] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    1.205872] ehci-platform: EHCI generic platform driver
[    1.206193] ehci-omap: OMAP-EHCI Host Controller driver
[    1.207036] usbcore: registered new interface driver usb-storage
[    1.210355] am335x-phy-driver 47401300.usb-phy: 47401300.usb-phy supply vcc not found, using dummy regulator
[    1.210513] am335x-phy-driver 47401300.usb-phy: Linked as a consumer to regulator.0
[    1.213918] am335x-phy-driver 47401b00.usb-phy: 47401b00.usb-phy supply vcc not found, using dummy regulator
[    1.214106] am335x-phy-driver 47401b00.usb-phy: Linked as a consumer to regulator.0
[    1.217592] musb-hdrc musb-hdrc.1: MUSB HDRC host driver
[    1.217635] musb-hdrc musb-hdrc.1: new USB bus registered, assigned bus number 1
[    1.217978] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 4.19
[    1.217989] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    1.217997] usb usb1: Product: MUSB HDRC host driver
[    1.218004] usb usb1: Manufacturer: Linux 4.19.50-ti-r22 musb-hcd
[    1.218011] usb usb1: SerialNumber: musb-hdrc.1
[    1.218834] hub 1-0:1.0: USB hub found
[    1.218895] hub 1-0:1.0: 1 port detected
[    1.230731] omap_rtc 44e3e000.rtc: already running
[    1.231430] omap_rtc 44e3e000.rtc: registered as rtc0
[    1.232921] i2c /dev entries driver
[    1.233458] Driver for 1-wire Dallas network protocol.
[    1.236316] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
[    1.236910] softdog: initialized. soft_noboot=0 soft_margin=60 sec soft_panic=0 (nowayout=0)
[    1.238599] cpuidle: enable-method property 'ti,am3352' found operations
[    1.239379] sdhci: Secure Digital Host Controller Interface driver
[    1.239387] sdhci: Copyright(c) Pierre Ossman
[    1.240194] omap_gpio 44e07000.gpio: Could not set line 6 debounce to 200000 microseconds (-22)
[    1.240209] omap_hsmmc 48060000.mmc: Got CD GPIO
[    1.240822] omap_hsmmc 48060000.mmc: Linked as a consumer to regulator.1
[    1.266658] omap_hsmmc 481d8000.mmc: Linked as a consumer to regulator.1
[    1.293383] omap_hsmmc 47810000.mmc: Linked as a consumer to regulator.2
[    1.340928] mmc1: new high speed MMC card at address 0001
[    1.346359] mmcblk1: mmc1:0001 S10004 3.56 GiB 
[    1.347006] mmcblk1boot0: mmc1:0001 S10004 partition 1 4.00 MiB
[    1.347615] mmcblk1boot1: mmc1:0001 S10004 partition 2 4.00 MiB
[    1.348061] mmcblk1rpmb: mmc1:0001 S10004 partition 3 4.00 MiB, chardev (242:0)
[    1.353830]  mmcblk1: p1
[    1.396553] sdhci-pltfm: SDHCI platform and OF driver helper
[    1.400331] ledtrig-cpu: registered to indicate activity on CPUs
[    1.401037] omap-aes 53500000.aes: OMAP AES hw accel rev: 3.2
[    1.401354] omap-aes 53500000.aes: will run requests pump with realtime priority
[    1.404332] omap-sham 53100000.sham: hw accel on OMAP rev 4.3
[    1.406152] omap_hsmmc 47810000.mmc: card claims to support voltages below defined range
[    1.408864] hidraw: raw HID events driver (C) Jiri Kosina
[    1.409645] usbcore: registered new interface driver usbhid
[    1.409651] usbhid: USB HID core driver
[    1.411077] remoteproc remoteproc0: wkup_m3 is available
[    1.412902] remoteproc remoteproc1: 4a334000.pru is available
[    1.413026] pru-rproc 4a334000.pru: PRU rproc node pru@4a334000 probed successfully
[    1.413397] remoteproc remoteproc2: 4a338000.pru is available
[    1.413484] pru-rproc 4a338000.pru: PRU rproc node pru@4a338000 probed successfully
[    1.421524] mmc2: new high speed SDIO card at address 0001
[    1.422453] gnss: GNSS driver registered with major 239
[    1.428549] wireguard: WireGuard 0.0.20190702 loaded. See www.wireguard.com for information.
[    1.428561] wireguard: Copyright (C) 2015-2019 Jason A. Donenfeld <[email protected]>. All Rights Reserved.
[    1.429660] NET: Registered protocol family 10
[    1.501369] Segment Routing with IPv6
[    1.501505] mip6: Mobile IPv6
[    1.501528] NET: Registered protocol family 17
[    1.501660] Key type dns_resolver registered
[    1.501667] mpls_gso: MPLS GSO support
[    1.502039] ThumbEE CPU extension supported.
[    1.502054] Registering SWP/SWPB emulation handler
[    1.502064] omap_voltage_late_init: Voltage driver support not added
[    1.509244] PM: Cannot get wkup_m3_ipc handle
[    1.515116] registered taskstats version 1
[    1.515125] Loading compiled-in X.509 certificates
[    1.515265] zswap: loaded using pool lzo/zbud
[    1.518518] Btrfs loaded, crc32c=crc32c-generic
[    1.518627] AppArmor: AppArmor sha1 policy hashing enabled
[    1.573346] tps6521x_pwrbutton tps65217-pwrbutton: DMA mask not set
[    1.574164] input: tps65217_pwr_but as /devices/platform/ocp/44e0b000.i2c/i2c-0/0-0024/tps65217-pwrbutton/input/input0
[    1.574741] tps65217 0-0024: TPS65217 ID 0xe version 1.2
[    1.575658] at24 0-0050: 32768 byte 24c256 EEPROM, writable, 1 bytes/write
[    1.575770] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
[    1.577652] omap_i2c 4802a000.i2c: bus 1 rev0.11 at 400 kHz
[    1.579697] omap_i2c 4819c000.i2c: bus 2 rev0.11 at 400 kHz
[    1.581645] remoteproc remoteproc0: powering up wkup_m3
[    1.581770] remoteproc remoteproc0: Booting fw image am335x-pm-firmware.elf, size 217168
[    1.585213] remoteproc remoteproc0: remote processor wkup_m3 is now up
[    1.585234] wkup_m3_ipc 44e11324.wkup_m3_ipc: CM3 Firmware Version = 0x193
[    1.585584] cpu cpu0: Linked as a consumer to regulator.4
[    1.585692] cpu cpu0: Dropping the link to regulator.4
[    1.586233] cpu cpu0: Linked as a consumer to regulator.4
[    1.589161] PM: bootloader does not support rtc-only!
[    1.591898] omap_rtc 44e3e000.rtc: setting system clock to 2019-07-11 20:05:45 UTC (1562875545)
[    1.593374] wlan-en-regulator: disabling
[    1.593400] ALSA device list:
[    1.593406]   No soundcards found.
[    1.600308] Freeing unused kernel memory: 1024K
[    1.601035] Run /init as init process
[    1.624179] usb 1-1: new high-speed USB device number 2 using musb-hdrc
[    1.841591] usb 1-1: New USB device found, idVendor=05a3, idProduct=9320, bcdDevice=27.02
[    1.841609] usb 1-1: New USB device strings: Mfr=2, Product=1, SerialNumber=3
[    1.841617] usb 1-1: Product: HD USB Camera
[    1.841624] usb 1-1: Manufacturer: HD USB Camera
[    1.841631] usb 1-1: SerialNumber: HD USB Camera
[    7.018646] EXT4-fs (mmcblk1p1): mounted filesystem with ordered data mode. Opts: (null)
[    7.837673] systemd[1]: systemd 241 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid)
[    7.838434] systemd[1]: Detected architecture arm.
[    7.862863] systemd[1]: Set hostname to <beaglebone>.
[    9.157267] systemd[1]: /lib/systemd/system/rc_battery_monitor.service:5: PIDFile= references path below legacy directory /var/run/, updating /var/run/rc_battery_monitor.pid → /run/rc_battery_monitor.pid; please update the unit file accordingly.
[    9.271218] systemd[1]: Listening on udev Kernel Socket.
[    9.273535] systemd[1]: Listening on Journal Audit Socket.
[    9.281176] systemd[1]: Created slice system-serial\x2dgetty.slice.
[    9.282324] systemd[1]: Listening on Journal Socket (/dev/log).
[    9.283322] systemd[1]: Listening on udev Control Socket.
[    9.286154] systemd[1]: Created slice system-getty.slice.
[   10.153836] EXT4-fs (mmcblk1p1): re-mounted. Opts: errors=remount-ro
[   11.597094] systemd-journald[304]: Received request to flush runtime journal from PID 1
[   21.408535] using random self ethernet address
[   21.408554] using random host ethernet address
[   21.639464] using random self ethernet address
[   21.639482] using random host ethernet address
[   22.179287] Mass Storage Function, version: 2009/09/11
[   22.179311] LUN: removable file: (no medium)
[   22.592437] usb0: HOST MAC 50:65:83:e4:ce:8c
[   22.599050] usb0: MAC 50:65:83:e4:ce:8d
[   22.619300] usb1: HOST MAC 50:65:83:e4:ce:8f
[   22.619619] usb1: MAC 50:65:83:e4:ce:90
[   23.504917] IPv6: ADDRCONF(NETDEV_UP): usb0: link is not ready
[   23.754724] IPv6: ADDRCONF(NETDEV_UP): usb1: link is not ready
[   25.208463] configfs-gadget gadget: high-speed config #1: c
[   25.208818] IPv6: ADDRCONF(NETDEV_CHANGE): usb0: link becomes ready
[   25.493081] IPv6: ADDRCONF(NETDEV_CHANGE): usb1: link becomes ready
[   30.211071] inv-mpu6050-i2c 2-0068: mounting matrix not found: using identity...
[   30.232617] inv-mpu6050-i2c 2-0068: invalid whoami 0x0 expected 0x71 (MPU9250)
[   30.453531] CAN device driver interface
[   30.877265] c_can_platform 481d0000.can: c_can_platform device registered (regs=9db33e58, irq=43)
[   31.753109] uvcvideo: Found UVC 1.00 device HD USB Camera (05a3:9320)
[   31.917038] uvcvideo 1-1:1.0: Entity type for entity Extension 3 was not initialized!
[   31.917061] uvcvideo 1-1:1.0: Entity type for entity Processing 2 was not initialized!
[   31.917072] uvcvideo 1-1:1.0: Entity type for entity Camera 1 was not initialized!
[   31.917587] input: HD USB Camera: HD USB Camera as /devices/platform/ocp/47400000.usb/47401c00.usb/musb-hdrc.1/usb1/1-1/1-1:1.0/input/input1
[   31.928184] usbcore: registered new interface driver uvcvideo
[   31.928199] USB Video Class driver (1.1.1)
[   35.213409] pvrsrvkm: loading out-of-tree module taints kernel.
[   35.872771] [drm] Initialized pvr 1.17.4948957 20110701 for 56000000.sgx on minor 0
[   40.726293] Bluetooth: Core ver 2.22
[   40.726478] NET: Registered protocol family 31
[   40.726486] Bluetooth: HCI device and connection manager initialized
[   40.726516] Bluetooth: HCI socket layer initialized
[   40.726530] Bluetooth: L2CAP socket layer initialized
[   40.726590] Bluetooth: SCO socket layer initialized
[   40.786767] Bluetooth: HCI UART driver ver 2.3
[   40.786788] Bluetooth: HCI UART protocol H4 registered
[   40.787046] Bluetooth: HCI UART protocol LL registered
[   40.787054] Bluetooth: HCI UART protocol ATH3K registered
[   40.787165] Bluetooth: HCI UART protocol Three-wire (H5) registered
[   41.765927] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   41.765944] Bluetooth: BNEP filters: protocol multicast
[   41.765972] Bluetooth: BNEP socket layer initialized
[   42.248775] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[   42.262556] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[   42.266362] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[   42.266398] cfg80211: failed to load regulatory.db
[   42.820573] Bluetooth: RFCOMM TTY layer initialized
[   42.820616] Bluetooth: RFCOMM socket layer initialized
[   42.820680] Bluetooth: RFCOMM ver 1.11
[   43.889435] wlcore: wl18xx HW: 183x or 180x, PG 2.2 (ROM 0x11)
[   43.913830] wlcore: loaded
[   44.512618] wlcore: PHY firmware version: Rev 8.2.0.0.242
[   44.553256] wlcore: firmware booted (Rev 8.9.0.0.79)
[   44.582510] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   45.302583] IPv6: ADDRCONF(NETDEV_UP): SoftAp0: link is not ready
[   46.017220] wlan0: authenticate with 36:c2:13:af:ad:d1
[   46.034163] wlan0: send auth to 36:c2:13:af:ad:d1 (try 1/3)
[   46.059700] wlan0: authenticated
[   46.068161] wlan0: associate with 36:c2:13:af:ad:d1 (try 1/3)
[   46.077661] wlan0: RX AssocResp from 36:c2:13:af:ad:d1 (capab=0x431 status=0 aid=1)
[   46.111426] wlan0: associated
[   46.127058] wlan0: Limiting TX power to 30 (30 - 0) dBm as advertised by 36:c2:13:af:ad:d1
[   46.489421] cryptd: max_cpu_qlen set to 1000
[   46.594908] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[   46.630041] wlcore: Association completed.
[   48.372970] wlcore: down
[   48.524498] IPv6: ADDRCONF(NETDEV_CHANGE): SoftAp0: link becomes ready
[  192.816309] wlcore: Beacon loss detected. roles:0x1
[  196.701489] wlcore: Beacon loss detected. roles:0x1
[  197.626940] wlcore: Connection loss work (role_id: 0).
[  197.626991] wlan0: Connection to AP 36:c2:13:af:ad:d1 lost
[  197.905011] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[  198.539945] wlan0: authenticate with 36:c2:13:af:ad:d1
[  198.548613] wlan0: send auth to 36:c2:13:af:ad:d1 (try 1/3)
[  198.672347] wlan0: authenticated
[  198.680061] wlan0: associate with 36:c2:13:af:ad:d1 (try 1/3)
[  198.684771] wlan0: RX AssocResp from 36:c2:13:af:ad:d1 (capab=0x431 status=0 aid=1)
[  198.704419] wlan0: associated
[  198.749922] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[  198.775715] wlcore: Association completed.

[pdp7]

@jadonk @RobertCNelson is this still an issue on the Blue?

[ConnorRigby]

Any news on this one? i'm trying to build a custom kernel that uses this device, but the latest kernel doesn't seem to even reference the mpu9250 symbol at all

edit: i was looking at the wrong kernel. I think i found it.

[ConnorRigby]

okay, i got it working with:

+	mpu9250@68 {
+		compatible = "invensense,mpu9250";
+		reg = <0x68>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <21 IRQ_TYPE_EDGE_RISING>;
+		i2c-gate {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			ax8975@c {
+				compatible = "ak8975";
+				reg = <0x0c>;
+			};
+		};
+	};

CONFIG_INV_MPU6050_I2C=y
CONFIG_AK8975=y
CONFIG_BMP280=y

Hopefully this helps someone in the future