On Thu, Jun 9, 2016 at 10:08 AM, <[email protected]> wrote: > > I've been trying to port the driver for a SPI rtc, the DS3234, from the 3.8 > kernel > to a recent 4.4. After minor changes the cape manager loads the dts file > sucessfully, > and the slot entry and /dev/rtc1 appear, but reading and writing to the > clock fails. > > Checking the pins and pin groups it seems that 4.4 isn't enabling the pins > group. > In 3.8 I get: > pin 100 (44e10990): 481a0000.spi (GPIO UNCLAIMED) function pinctrl_spi1_pins > group pinctrl_spi1_pins > pin 101 (44e10994): 481a0000.spi (GPIO UNCLAIMED) function pinctrl_spi1_pins > group pinctrl_spi1_pins > pin 102 (44e10998): 481a0000.spi (GPIO UNCLAIMED) function pinctrl_spi1_pins > group pinctrl_spi1_pins > pin 103 (44e1099c): 481a0000.spi (GPIO UNCLAIMED) function pinctrl_spi1_pins > group pinctrl_spi1_pins > > and in 4.4 the pins are unclaimed by both GPIO and MUX. > > The uEnv.txt line is: > optargs=bone_capemgr.enable_partno=BB-SPIDEV0,BB-SPI1CLK > Loading SPIDEV1 in place of SPI1CLK produces the correct /dev/spidevN.N > devices, > but again these don't seem to be useable; the test programs in the kernel > sources fail. > > The only change between the 3.8 and 4.4 setups is that the HDMI overlay has > gone, > and there seems no way to disable HDMI. There's a note in one of Robert > Nelson's > pages that setting dtb=am335x-boneblack-overlay.dtb in uEnv.txt will achieve > this, > but checking the new u-boot code that doesn't seem likely, and checking the > pins > and pingroups shows no change.
Our u-boot patch looks for dtb=... https://github.com/RobertCNelson/Bootloader-Builder/blob/master/patches/v2016.03/0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch#L455-L458 Regards, -- Robert Nelson https://rcn-ee.com/ -- 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/CAOCHtYiUzcpZqMwRrA__LKhnHNoyukSKFDctk%2B1MiKdMK3rA5g%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
