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 <redacted>
---
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

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