Additionally. You did set the time on the RTC before trying to read from it ?
On Sat, Jul 2, 2016 at 2:26 PM, William Hermans <[email protected]> wrote: > Have you updated the device tree compiler ? Here, I'm assuming you simply > upgraded the kernel form an image that initially had 3.8.x installed . . . > > > http://www.embeddedhobbyist.com/2015/09/beaglebone-black-updating-device-tree-files/ > > On Sat, Jul 2, 2016 at 2:08 PM, <[email protected]> wrote: > >> >> Running kernel 4.4 and trying to read a DS3234 clock on the second SPI >> port I can suppress the HDMI pins in uEnv.txt with: >> >> dtb=am335x-boneblack-emmc-overlay.dtb >> >> optargs=cape_disable=bone_capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN >> >> (uEnv.txt isn't loading the "universal overlay".) >> >> Loading BB-SPIDEV0 and BB-SPI1CLK then produces the expected >> /dev/spidev1.0, >> /dev/spidev1.1 and /dev/rtc1 devices. >> >> dmesg says: >> bone_capemgr bone_capemgr: part_number 'BB-SPI1CLK', version 'N/A' >> bone_capemgr bone_capemgr: slot #6: override >> bone_capemgr bone_capemgr: Using override eeprom data at slot 6 >> bone_capemgr bone_capemgr: slot #6: 'Override Board Name,00A0,Override >> Manuf,BB-SPI1CLK' >> ds3234 spi2.0: Control Reg: 0x00 >> ds3234 spi2.0: Ctrl/Stat Reg: 0x00 >> ds3234 spi2.0: rtc core: registered ds3234 as rtc1 >> bone_capemgr bone_capemgr: slot #6: dtbo 'BB-SPI1CLK-00A0.dtbo' loaded; >> overlay id #1 >> >> However, there's no spi pingroup, and the relevant pins remain in mode 7 >> not mode 3, and are unclaimed: >> >> pin 100 (44e10990.0) 00000027 pinctrl-single >> pin 101 (44e10994.0) 00000027 pinctrl-single >> pin 102 (44e10998.0) 00000027 pinctrl-single >> pin 103 (44e1099c.0) 00000027 pinctrl-single >> >> pin 100 (44e10990.0): (MUX UNCLAIMED) (GPIO UNCLAIMED) >> pin 101 (44e10994.0): (MUX UNCLAIMED) (GPIO UNCLAIMED) >> pin 102 (44e10998.0): (MUX UNCLAIMED) (GPIO UNCLAIMED) >> pin 103 (44e1099c.0): (MUX UNCLAIMED) (GPIO UNCLAIMED) >> >> and reading the clocks gives: >> >> quid ~ # hwclock -f /dev/rtc0 -r >> Sat Jul 2 21:00:10 2016 .954216 seconds >> quid ~ # hwclock -f /dev/rtc1 -r >> hwclock: ioctl(RTC_RD_TIME) to /dev/rtc1 to read the time failed: Invalid >> argument >> quid ~ # >> >> The clock overlay worked in 3.8, and I _think_ I've updated it correctly >> for >> 4.4. Can anyone spot what I've missed? >> >> /* >> ** Dallas DS3234 RTC SPI driver test. >> ** >> ** Virtual cape for SPI1 on connector pins P9.29 P9.31 P9.30 P9.28 >> ** >> ** Pin Identities. >> ** >> ** SPI_1 names : CS0, DO, DI, CLK >> ** P9 pins : 28, 29, 30, 31 >> ** GPIO3 pins : 17, 15, 16, 14 >> ** Processor pins : C12, B13, D12, A13 >> ** SRM table 15 ?? : 214, 210, 212, 218 >> ** Pingroup labels : 103, 101, ??? 100 >> ** Code offsets : 0x19c, 0x194, 0x198, 0x190 >> ** Base pin gpmc_ad0 has address 0x800 giving: >> ** : 0x99c, 0x994, 0x998, 0x990 >> ** TRM 9.3 (spi0) : 0x95c, 0x954, 0x958, 0x950 >> ** >> ** Moved to kernel 4.x GPIO bank numbering. >> */ >> >> /dts-v1/; >> /plugin/; >> >> / { >> compatible = "ti,beaglebone", "ti,beaglebone-black"; >> >> /* identification */ >> part-number = "BB-SPI1CLK"; >> version = "00A0"; >> >> /* Resources */ >> exclusive-use = >> /* Pin header */ >> "P9.31", /* spi1_sclk */ >> "P9.29", /* spi1_d0 */ >> "P9.30", /* spi1_d1 */ >> "P9.28", /* spi1_cs0 */ >> /* Hardware */ >> "spi1"; >> >> fragment@0 { >> target = <&am33xx_pinmux>; >> __overlay__ { >> /* Default has all gpios released, mode uart1 */ >> pinctrl_spi1: pinctrl_spi1_pins { >> pinctrl-single,pins = < >> 0x190 0x33 /* P9_31 = mcasp0_aclkx.spi1_sclk, >> INPUT_PULLUP | MODE3 */ >> 0x194 0x33 /* P9_29 = mcasp0_fsx.spi1_d0, >> INPUT_PULLUP | MODE3 */ >> 0x198 0x13 /* P9_30 = mcasp0_axr0.spi1_d1, >> OUTPUT_PULLUP | MODE3 */ >> 0x19c 0x13 /* P9_28 = mcasp0_ahclkr.spi1_cs0, >> OUTPUT_PULLUP | MODE3 */ >> >; >> }; >> }; >> }; >> >> fragment@1 { >> target = <&spi1>; >> __overlay__ { >> #address-cells = <1>; >> #size-cells = <0>; >> status = "okay"; >> pinctrl-names = "default"; >> pinctrl-0 = <&pinctrl_spi1>; >> cs-gpios = <&gpio3 17 0>; /* Is this needed ??? */ >> ds3234@0 { >> #address-cells = <1>; >> #size-cells = <0>; >> compatible = "ds3234"; >> reg = <0>; >> spi-max-frequency = <200000>; /* Slowed for testing */ >> /* spi-cpha ??? */ >> }; >> }; >> }; >> >> }; >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/214a0cf1-6d1f-4b52-9335-7689dd8abb68%40googlegroups.com >> <https://groups.google.com/d/msgid/beagleboard/214a0cf1-6d1f-4b52-9335-7689dd8abb68%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. 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