Messages in this thread |  | | Date | Tue, 14 Jan 2025 12:17:08 -0800 | | Subject | Re: [PATCH v3 0/6] Add support to retrieve the bootstatus from watchdog for RZ/V2H(P) SoC | | From | Guenter Roeck <> |
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On 1/14/25 12:03, Rob Herring wrote: > On Mon, Jan 13, 2025 at 11:38:08AM +0000, Biju Das wrote: >> Hi Prabhakar, >> >>> -----Original Message----- >>> From: Prabhakar <prabhakar.csengg@gmail.com> >>> Sent: 13 January 2025 11:24 >>> Subject: [PATCH v3 0/6] Add support to retrieve the bootstatus from watchdog for RZ/V2H(P) SoC >>> >>> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> >>> >>> Hi All, >>> >>> This patch series adds SYSCON support to retrieve boot status information for RZ/V2H(P) SoC. >>> Summary of Changes, >>> >>> Clock: >>> Add syscon compatible support to the CPG block in bindings and >>> device trees. >>> >>> Watchdog: >>> Document the renesas,r9a09g057-syscon-wdt-errorrst property. >>> Update the watchdog driver to fetch and report boot status via >>> Error Reset Registers (CPG_ERROR_RSTm). >>> >>> Device Tree: >>> Add the syscon property to CPG and WDT nodes in R9A09G057 and >>> R9A09G047 SoC DTSI. >>> >>> These changes enable the watchdog driver to identify boot sources like Power-on Reset and Watchdog >>> Reset, improving system diagnostics. >> >> This means that, we should assume U-boot/bootloader should not clear the WDT reset status bit. >> >> If they clear it, there should be a way to propagate it from u-boot/bootloader to linux, >> otherwise, we get wrong bootstatus in linux. >> But the clearing of watchdog status by one of the cases: >> >> 1) u-boot identify the boot source and clear the status bit >> 2) u-boot identify the boot source and does not clear the status bit, but linux clear it. >> 3) u-boot does not touch WDT status bits, but linux clear it. > > Sounds like the same problem as this[1]. If that works for you, please > comment there. Always better if there is more than 1 user for something > "common". > > Rob > > [1]https://lore.kernel.org/devicetree-spec/48defa98-9718-4997-86cb-b171187708a6@cherry.de/T/#u
If this ends up being provided through /chosen, it should probably be supported in the watchdog core.
Guenter
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