[PATCH v3 0/3] rockchip: odroid-m1s/rk3566 watchdog support

[Andreas Zdziarstek]

This series makes the Synopsys DesignWare watchdog usable on rk3566/rk3568
and enables it on the Hardkernel ODROID-M1S.

On current next the dw-wdt driver already probes (d62801d09441), but a
timeout or "wdt expire" still hangs the SoC: CRU_GLB_RST_CON routes the
watchdog to the second global reset by default, which causes a hung SoC.

Patch 1 routes the watchdog to the first global reset instead, same as
the PX30 implementation. Patch 2 does the same for the TSADC, so a
thermal shutdown also resets the whole SoC. Patch 3 enables the watchdog
(wdt command only, no autostart to be non-breaking) on the ODROID-M1S.

Verified on the ODROID-M1S (RK3566): a watchdog timeout cleanly reboots
the board.

Changes in v3:
- patch 1: keep the glb_rst_con write inside CONFIG_XPL_BUILD (review
  comment by Jonas)
- patch 2: fold the WDT and TSADC bits into a single glb_rst_con
  read-modify-write instead of two separate ones (review comment by Jonas)

Changes in v2:
- patch 1: access CRU_GLB_RST_CON through the rk3568_cru struct, matching
  PX30's arch_cpu_init() (review comment by Quentin)
- patch 2 (new): also route the TSADC to a first global reset (review
  comment by Quentin)
- patch 3 (was 2/2): unchanged

On the TSADC (patch 2): while checking how the ODROID-M1S comes up, I
noticed the rkbin DDR init (probably, at least I don't know what else
could set it at that stage) already sets the TSADC bit in CRU_GLB_RST_CON
before U-Boot runs. So, on this board the patch is effectively a no-op. It
still seems right to configure it explicitly in U-Boot rather than depend
on the firmware blob, and it matches what PX30 does.

Andreas Zdziarstek (3):
  rockchip: rk3568: make the WDT trigger a first global reset
  rockchip: rk3568: make the TSADC trigger a first global reset
  rockchip: odroid-m1s: enable watchdog support

 arch/arm/mach-rockchip/rk3568/rk3568.c | 11 +++++++++++
 configs/odroid-m1s-rk3566_defconfig    |  5 +++++
 2 files changed, 16 insertions(+)


base-commit: 835a18f80f25731dc818bf9b771bfa111ea3dbeb
-- 
2.53.0