How to enable internal RTC for iMX7D

[isaacnickaein]

What settings (if any) should be added to device tree to enable the internal RTC for i.MX7D 1GB module? 

I have already enabled the drivers in kernel config, but I am not sure what should be added in DTS.

The kernel I am using is 4.9.67.

Here is the relevant RTC kernel configs. I think I have enabled the required drivers:

CONFIG_RTC_LIB=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_HCTOSYS=y
CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
CONFIG_RTC_SYSTOHC=y
CONFIG_RTC_SYSTOHC_DEVICE="rtc0"

CONFIG_RTC_INTF_SYSFS=y
CONFIG_RTC_INTF_PROC=y
CONFIG_RTC_INTF_DEV=y
CONFIG_RTC_DRV_DS1307=y
CONFIG_RTC_DRV_DS1307_HWMON=y

CONFIG_RTC_I2C_AND_SPI=y

CONFIG_RTC_DRV_SNVS=y

But no messages related to RTC is shown up in the dmesg, except an error indicating rtc0 device is not present.

Here is full dmesg log:

[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.9.67-00001-gda84bd4-dirty (samim@ubuntu) (gcc version 7.2.0 (GCC) ) #1 SMP Mon Jan 22 13:53:29 IRST 2018
[ 0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d
[ 0.000000] CPU: div instructions available: patching division code
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] OF: fdt:Machine model: Toradex Colibri iMX7D 1GB on Colibri Evaluation Board V3
[ 0.000000] Reserved memory: created CMA memory pool at 0xac000000, size 320 MiB
[ 0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool
[ 0.000000] Memory policy: Data cache writealloc
[ 0.000000] On node 0 totalpages: 262144
[ 0.000000] free_area_init_node: node 0, pgdat 80c480c0, node_mem_map ab75a000
[ 0.000000] Normal zone: 2048 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 262144 pages, LIFO batch:31
[ 0.000000] percpu: Embedded 14 pages/cpu @ab71f000 s25804 r8192 d23348 u57344
[ 0.000000] pcpu-alloc: s25804 r8192 d23348 u57344 alloc=14*4096
[ 0.000000] pcpu-alloc: [0] 0 [0] 1
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 260096
[ 0.000000] Kernel command line: ip=off root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait console=tty1 console=ttymxc0,115200n8 consoleblank=0 video=mxsfb:640x480M-16@60
[ 0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[ 0.000000] Memory: 698996K/1048576K available (7168K kernel code, 291K rwdata, 2068K rodata, 1024K init, 409K bss, 21900K reserved, 327680K cma-reserved)
[ 0.000000] Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
vmalloc : 0xc0800000 - 0xff800000 (1008 MB)
lowmem : 0x80000000 - 0xc0000000 (1024 MB)
modules : 0x7f000000 - 0x80000000 ( 16 MB)
.text : 0x80008000 - 0x80800000 (8160 kB)
.init : 0x80b00000 - 0x80c00000 (1024 kB)
.data : 0x80c00000 - 0x80c48c60 ( 292 kB)
.bss : 0x80c4a000 - 0x80cb0780 ( 410 kB)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
[ 0.000000] Hierarchical RCU implementation.
[ 0.000000] Build-time adjustment of leaf fanout to 32.
[ 0.000000] RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=2.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=32, nr_cpu_ids=2
[ 0.000000] NR_IRQS:16 nr_irqs:16 16
[ 0.000000] arm_arch_timer: Architected cp15 timer(s) running at 8.00MHz (phys).
[ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x1d854df40, max_idle_ns: 440795202120 ns
[ 0.000007] sched_clock: 56 bits at 8MHz, resolution 125ns, wraps every 2199023255500ns
[ 0.000019] Switching to timer-based delay loop, resolution 125ns
[ 0.000337] Ignoring duplicate/late registration of read_current_timer delay
[ 0.000354] clocksource: mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 637086815595 ns
[ 0.001876] Console: colour dummy device 80x30
[ 0.002560] console [tty1] enabled
[ 0.002593] Calibrating delay loop (skipped), value calculated using timer frequency.. 16.00 BogoMIPS (lpj=80000)
[ 0.002643] pid_max: default: 32768 minimum: 301
[ 0.002750] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.002782] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.003494] CPU: Testing write buffer coherency: ok
[ 0.003809] Setting up static identity map for 0x80100000 - 0x80100058
[ 0.005770] Brought up 2 CPUs
[ 0.005808] SMP: Total of 2 processors activated (32.00 BogoMIPS).
[ 0.005834] CPU: All CPU(s) started in SVC mode.
[ 0.006536] devtmpfs: initialized
[ 0.019148] VFP support v0.3: implementor 41 architecture 2 part 30 variant 7 rev 5
[ 0.019512] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.019572] futex hash table entries: 512 (order: 3, 32768 bytes)
[ 0.030846] pinctrl core: initialized pinctrl subsystem
[ 0.032020] NET: Registered protocol family 16
[ 0.037501] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.059958] cpuidle: using governor menu
[ 0.070749] DDR type is DDR3!
[ 0.079086] imx7d_enet_clk_sel: failed to get enet_out clock, assuming ext. clock source
[ 0.079165] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[ 0.079207] hw-breakpoint: maximum watchpoint size is 8 bytes.
[ 0.079539] imx7d-pinctrl 302c0000.iomuxc-lpsr: initialized IMX pinctrl driver
[ 0.080927] imx7d-pinctrl 30330000.iomuxc: initialized IMX pinctrl driver
[ 0.081858] imx-gpcv2 30000000.aips-bus:pgc: mipi regulator not ready.
[ 0.082454] MU is ready for cross core communication!
[ 0.105416] mxs-dma 33000000.dma-apbh: initialized
[ 0.106896] VCC_USB[1-4]: supplied by 5V
[ 0.107524] SCSI subsystem initialized
[ 0.107832] usbcore: registered new interface driver usbfs
[ 0.107925] usbcore: registered new interface driver hub
[ 0.108061] usbcore: registered new device driver usb
[ 0.108282] 30800000.aips-bus:usbphynop1 supply vcc not found, using dummy regulator
[ 0.108552] 30800000.aips-bus:usbphynop2 supply vcc not found, using dummy regulator
[ 0.109636] i2c i2c-0: IMX I2C adapter registered
[ 0.109674] i2c i2c-0: can't use DMA, using PIO instead.
[ 0.110329] i2c i2c-3: IMX I2C adapter registered
[ 0.110367] i2c i2c-3: can't use DMA, using PIO instead.
[ 0.110571] pps_core: LinuxPPS API ver. 1 registered
[ 0.110600] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.110665] PTP clock support registered
[ 0.111140] imx rpmsg driver is registered.
[ 0.112433] clocksource: Switched to clocksource arch_sys_counter
[ 0.112571] VFS: Disk quotas dquot_6.6.0
[ 0.112648] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 0.123357] NET: Registered protocol family 2
[ 0.123978] TCP established hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.124101] TCP bind hash table entries: 8192 (order: 4, 65536 bytes)
[ 0.124264] TCP: Hash tables configured (established 8192 bind 8192)
[ 0.124346] UDP hash table entries: 512 (order: 2, 16384 bytes)
[ 0.124417] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes)
[ 0.124619] NET: Registered protocol family 1
[ 0.125040] RPC: Registered named UNIX socket transport module.
[ 0.125073] RPC: Registered udp transport module.
[ 0.125098] RPC: Registered tcp transport module.
[ 0.125121] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 0.126880] Bus freq driver module loaded
[ 0.128347] workingset: timestamp_bits=30 max_order=18 bucket_order=0
[ 0.136670] NFS: Registering the id_resolver key type
[ 0.136725] Key type id_resolver registered
[ 0.136749] Key type id_legacy registered
[ 0.136782] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[ 0.137382] ntfs: driver 2.1.32 [Flags: R/W].
[ 0.137744] fuse init (API version 7.26)
[ 0.143248] io scheduler noop registered
[ 0.143284] io scheduler deadline registered
[ 0.143486] io scheduler cfq registered (default)
[ 0.145831] 30730000.lcdif supply lcd not found, using dummy regulator
[ 0.210774] mxsfb 30730000.lcdif: failed to find mxc display driver
[ 0.219803] Console: switching to colour frame buffer device 80x30
[ 0.238217] mxsfb 30730000.lcdif: initialized
[ 0.241728] imx-sdma 30bd0000.sdma: no iram assigned, using external mem
[ 0.245014] imx-sdma 30bd0000.sdma: loaded firmware 4.2
[ 0.251887] 30860000.serial: ttymxc0 at MMIO 0x30860000 (irq = 53, base_baud = 1500000) is a IMX
[ 0.944075] console [ttymxc0] enabled
[ 0.950570] 30890000.serial: ttymxc1 at MMIO 0x30890000 (irq = 54, base_baud = 1500000) is a IMX
[ 0.964235] 30880000.serial: ttymxc2 at MMIO 0x30880000 (irq = 55, base_baud = 500000) is a IMX
[ 0.984674] loop: module loaded
[ 0.995289] vdd1p0d: supplied by DCDC3
[ 1.012208] spi_imx 30840000.ecspi: dma setup error -19, use pio
[ 1.020889] spi_imx 30840000.ecspi: probed
[ 1.027757] libphy: Fixed MDIO Bus: probed
[ 1.034528] CAN device driver interface
[ 1.040887] 30a00000.can supply xceiver not found, using dummy regulator
[ 1.050670] flexcan 30a00000.can: device registered (reg_base=f5a00000, irq=58)
[ 1.062514] 30a10000.can supply xceiver not found, using dummy regulator
[ 1.072301] flexcan 30a10000.can: device registered (reg_base=f5a10000, irq=59)
[ 1.087533] pps pps0: new PPS source ptp0
[ 1.099209] libphy: fec_enet_mii_bus: probed
[ 1.106776] fec 30be0000.ethernet eth0: registered PHC device 0
[ 1.115325] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 1.124309] ehci-mxc: Freescale On-Chip EHCI Host driver
[ 1.132237] usbcore: registered new interface driver usb-storage
[ 1.140789] usbcore: registered new interface driver usbserial
[ 1.149031] usbcore: registered new interface driver usbserial_generic
[ 1.157926] usbserial: USB Serial support registered for generic
[ 1.166280] usbcore: registered new interface driver ftdi_sio
[ 1.174382] usbserial: USB Serial support registered for FTDI USB Serial Device
[ 1.186252] usbcore: registered new interface driver pl2303
[ 1.194202] usbserial: USB Serial support registered for pl2303
[ 1.203567] 30b10200.usbmisc supply vbus-wakeup not found, using dummy regulator
[ 1.215648] 30b30200.usbmisc supply vbus-wakeup not found, using dummy regulator
[ 1.227845] 30b20200.usbmisc supply vbus-wakeup not found, using dummy regulator
[ 1.243955] ci_hdrc ci_hdrc.0: EHCI Host Controller
[ 1.251321] ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 1
[ 1.282469] ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
[ 1.291389] hub 1-0:1.0: USB hub found
[ 1.297670] hub 1-0:1.0: 1 port detected
[ 1.304999] mousedev: PS/2 mouse device common for all mice
[ 1.316012] input: AD7879 Touchscreen as /devices/soc0/soc/30800000.aips-bus/30a20000.i2c/i2c-0/0-002c/input/input0
[ 1.331974] i2c /dev entries driver
[ 1.339895] imx2-wdt 30280000.wdog: timeout 60 sec (nowayout=0)
[ 1.349628] sdhci: Secure Digital Host Controller Interface driver
[ 1.358258] sdhci: Copyright(c) Pierre Ossman
[ 1.365004] sdhci-pltfm: SDHCI platform and OF driver helper
[ 1.373942] sdhci-esdhc-imx 30b40000.usdhc: Got CD GPIO
[ 1.442578] mmc1: SDHCI controller on 30b40000.usdhc [30b40000.usdhc] using ADMA
[ 1.516688] mmc1: new high speed SD card at address 0001
[ 1.524589] mmc0: SDHCI controller on 30b60000.usdhc [30b60000.usdhc] using ADMA
[ 1.537710] mmcblk1: mmc1:0001 SD 1.85 GiB
[ 1.545282] caam 30900000.caam: ERA source: CCBVID.
[ 1.559582] caam 30900000.caam: Entropy delay = 3200
[ 1.566590] mmcblk1: p1
[ 1.571635] caam 30900000.caam: Instantiated RNG4 SH0
[ 1.631047] caam 30900000.caam: Instantiated RNG4 SH1
[ 1.637947] caam 30900000.caam: device ID = 0x0a16030000000000 (Era 8)
[ 1.646294] caam 30900000.caam: job rings = 3, qi = 0
[ 1.678239] caam algorithms registered in /proc/crypto
[ 1.688222] caam_jr 30901000.jr0: registering rng-caam
[ 1.695307] caam 30900000.caam: caam pkc algorithms registered in /proc/crypto
[ 1.706497] hidraw: raw HID events driver (C) Jiri Kosina
[ 1.713950] usbcore: registered new interface driver usbhid
[ 1.721272] usbhid: USB HID core driver
[ 1.731504] coresight-etm3x 3007c000.etm: ETM 3.5 initialized
[ 1.739548] coresight-etm3x 3007d000.etm: ETM 3.5 initialized
[ 1.747199] Netfilter messages via NETLINK v0.30.
[ 1.753607] nfnl_acct: registering with nfnetlink.
[ 1.760293] nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
[ 1.768381] nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>
[ 1.776858] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 1.784412] NET: Registered protocol family 10
[ 1.793140] ip6_tables: (C) 2000-2006 Netfilter Core Team
[ 1.800245] NET: Registered protocol family 17
[ 1.806412] Bridge firewalling registered
[ 1.812029] can: controller area network core (rev 20120528 abi 9)
[ 1.820023] NET: Registered protocol family 29
[ 1.826105] can: raw protocol (rev 20120528)
[ 1.831933] can: broadcast manager protocol (rev 20161123 t)
[ 1.839189] can: netlink gateway (rev 20130117) max_hops=1
[ 1.846459] 8021q: 802.1Q VLAN Support v1.8
[ 1.852280] Key type dns_resolver registered
[ 1.864605] Registering SWP/SWPB emulation handler
[ 1.875255] registered taskstats version 1
[ 1.890419] mmc0: new HS400 MMC card at address 0001
[ 1.902532] mmcblk0: mmc0:0001 Q2J54A 3.64 GiB
[ 1.909218] mmcblk0boot0: mmc0:0001 Q2J54A partition 1 2.00 MiB
[ 1.917058] mmcblk0boot1: mmc0:0001 Q2J54A partition 2 2.00 MiB
[ 1.925835] mmcblk0: p1 p2
[ 1.942482] random: fast init done
[ 2.503839] imx_thermal 30000000.aips-bus:tempmon: Extended Commercial CPU temperature grade - max:105C critical:100C passive:95C
[ 2.520666] input: gpio-keys as /devices/soc0/gpio-keys/input/input1
[ 2.529532] hctosys: unable to open rtc device (rtc0)
[ 2.557876] +V3.3: disabling
[ 2.562403] +V3.3_AVDD_AUDIO: disabling
[ 2.576783] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 2.588275] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
[ 2.598899] devtmpfs: mounted
[ 2.604668] Freeing unused kernel memory: 1024K
[ 2.693178] systemd[1]: System time before build time, advancing clock.
[ 2.716163] systemd[1]: systemd 234 running in system mode. (+PAM -AUDIT -SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP -LIBCRYPTSETUP -GCRYPT -GNUTLS -ACL -XZ +LZ4 -SECCOMP +BLKID -ELFUTILS +KMOD -IDN2 +IDN default-hierarchy=hybrid)
[ 2.744289] systemd[1]: Detected architecture arm.
[ 2.783023] systemd[1]: Set hostname to <colibri-imx7-emmc>.
[ 3.000506] systemd[1]: Listening on /dev/initctl Compatibility Named Pipe.
[ 3.042893] systemd[1]: Listening on Journal Socket.
[ 3.082826] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
[ 3.122702] systemd[1]: Reached target Remote File Systems.
[ 3.162871] systemd[1]: Started Dispatch Password Requests to Console Directory Watch.
[ 3.202648] systemd[1]: Reached target Paths.
[ 3.243230] systemd[1]: Created slice User and Session Slice.
[ 3.798279] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[ 4.118582] systemd-journald[193]: Received request to flush runtime journal from PID 1
[ 4.138703] systemd-journald[193]: File /var/log/journal/8207b698f4924866ae8061b92bb22c0a/system.journal corrupted or uncleanly shut down, renaming and replacing.
[ 5.352933] using random self ethernet address
[ 5.359745] using random host ethernet address
[ 5.606341] FAT-fs (mmcblk1p1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[ 5.872646] Micrel KSZ8041 30be0000.ethernet-1:00: attached PHY driver [Micrel KSZ8041] (mii_bus:phy_addr=30be0000.ethernet-1:00, irq=-1)
[ 5.889535] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 7.993096] fec 30be0000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 8.001194] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 206.752537] random: crng init done

[CarlosCasillas]

toradex do you have any comment regarding this?

[isaacnickaein]

Hi Carlos,

I've also asked this question on Toradex's forum here:

How to enable internal RTC on Colibri iMX7 1GB - Toradex Community 

Apparently, the internal RTC can be enabled by adding a snvs node to the device tree as follows. More info can be found on the post for anyone having the similar issue.

Cheers,

--- a/arch/arm/boot/dts/imx7s.dtsi
+++ b/arch/arm/boot/dts/imx7s.dtsi
@@ -643,6 +643,34 @@
reg = <0x30370000 0x10000>;
};

+ snvs: snvs@30370000 {
+ compatible = "fsl,sec-v4.0-mon", "syscon", "simple-mfd";
+ reg = <0x30370000 0x10000>;
+
+ snvs_rtc: snvs-rtc-lp {
+ compatible = "fsl,sec-v4.0-mon-rtc-lp";
+ regmap = <&snvs>;
+ offset = <0x34>;
+ interrupts = <GIC_SPI 19 IRQ_TYPE_LEVEL_HIGH>,
+ <GIC_SPI 20 IRQ_TYPE_LEVEL_HIGH>;
+ };
+
+ snvs_poweroff: snvs-poweroff {
+ compatible = "syscon-poweroff";
+ regmap = <&snvs>;
+ offset = <0x38>;
+ mask = <0x60>;
+ };
+
+ snvs_pwrkey: snvs-powerkey {
+ compatible = "fsl,sec-v4.0-pwrkey";
+ regmap = <&snvs>;
+ interrupts = <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
+ linux,keycode = <KEY_POWER>;
+ wakeup-source;
+ };
+ };

[falstaff]

Yes this is an issue in our current 2.8b1 release (using NXP L4.9.11 release). There is a fix available on our -next branch:

linux-toradex.git - Linux kernel for Apalis and Colibri modules