Hello, On 29/11/2018 01:50:11+0000, Anson Huang wrote: > i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller > inside, the system controller is in charge of controlling power, > clock and secure rtc etc.. > > This patch adds i.MX system controller RTC driver support, > Linux kernel has to communicate with system controller via MU > (message unit) IPC to set/get RTC time and other alarm functions, > since the RTC set time needs to be done in secure EL3 mode (required > by system controller firmware) and alarm functions needs to be done > with general MU IRQ handle, these depend on other components which > are NOT ready, so this patch ONLY enables the RTC time read. > > Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx> > --- > ChangeLog: > V3->V4: > *remove unnecessary headfile included; > *fix potential memory currpution for the message responce; > *update the compatible string name to start with "fsl" instead of "nxp". > drivers/rtc/Kconfig | 6 +++ > drivers/rtc/Makefile | 1 + > drivers/rtc/rtc-imx-sc.c | 98 ++++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 105 insertions(+) > create mode 100644 drivers/rtc/rtc-imx-sc.c > I applied it on my test branch and this makes sparc64-allyesconfig fail with: drivers/rtc/rtc-imx-sc.o: In function `imx_sc_rtc_read_time': rtc-imx-sc.c:(.text+0x34): undefined reference to `imx_scu_call_rpc' drivers/rtc/rtc-imx-sc.o: In function `imx_sc_rtc_probe': rtc-imx-sc.c:(.text+0x90): undefined reference to `imx_scu_get_handle' -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
