linux-kernel - Re: [PATCH v2 0/2] arm64: dts: ti: k3-j784s4: Mark tps659413 regulators as bootph-all

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Message-ID: <lnrcosn7e7x6v5kerll3sqyy7r3qup5nmqi4m3puzjfcvpoljv@6lfmyprzwseu>
Date: Thu, 12 Sep 2024 11:02:46 -0500
From: Andrew Halaney <ahalaney@...hat.com>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, 
	Udit Kumar <u-kumar1@...com>, Tero Kristo <kristo@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: Keerthy <j-keerthy@...com>, Neha Malcom Francis <n-francis@...com>, 
	Eric Chanudet <echanude@...hat.com>, Enric Balletbo <eballetb@...hat.com>, 
	Udit Kumar <u-kumar1@...com>, linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/2] arm64: dts: ti: k3-j784s4: Mark tps659413
 regulators as bootph-all

On Wed, Sep 11, 2024 at 12:19:01PM GMT, Andrew Halaney wrote:
> This series marks tps659413's regulators as bootph-all in order for
> the nodes (and parent nodes) to be accessible during MCU's u-boot SPL.
> 
> This in turn is desired since the tps659413 needs its MCU ESM
> state machine setup in order for the watchdog to reset the board.
> 
> This took me a little while to track down, as enabling the ESM, TPS6594,
> etc in u-boot would result in the below boot failure:
> 
>     U-Boot SPL 2024.10-rc4-00007-g44b12cbcd1b3-dirty (Sep 06 2024 - 14:25:52 -0500)
>     SYSFW ABI: 3.1 (firmware rev 0x0009 '9.2.4--v09.02.04 (Kool Koala)')
>     Initialized 4 DRAM controllers
>     SPL initial stack usage: 13408 bytes
>     ### ERROR ### Please RESET the board ###
> 
> Which turns out to actually have failed far earlier in spl_early_init(),
> due to these nodes not being accessible in u-boot. That's hard to tell
> though since console isn't setup until later (and for that reason I
> think spl_early_init()'s return value in j784s4_init.c isn't
> evaluated since a panic() at that point would leave a user with *no*
> information at all).
> 
> I've tested this in conjunction with a u-boot series which I'll link in
> a follow-up response on the k3-j784s4-evm. I'd appreciate someone testing
> on the k3-am69-sk at a minimum, as it should suffer the same fate if things
> aren't setup appropriately.
> 
> Signed-off-by: Andrew Halaney <ahalaney@...hat.com>

Link to the u-boot series: https://lore.kernel.org/all/3bf2177d-178f-46bf-abfe-6f00a52c623b@ti.com/#t

Udit, it seems you tested the am69-sk patch from this series in the above
u-boot link, thanks! If that's correct mind adding your Tested-by on
the patch here then as well?

Thanks,
Andrew

> ---
> Changes in v2:
> - Only mark the regulator nodes as bootph-all since parents are implied
> - Link to v1: https://lore.kernel.org/r/20240906-j784s4-tps6594-bootph-v1-0-c5b58d43bf04@redhat.com
> 
> ---
> Andrew Halaney (2):
>       arm64: dts: ti: k3-j784s4-evm: Mark tps659413 regulators as bootph-all
>       arm64: dts: ti: k3-am69-sk:  Mark tps659413 regulators as bootph-all
> 
>  arch/arm64/boot/dts/ti/k3-am69-sk.dts    | 8 ++++++++
>  arch/arm64/boot/dts/ti/k3-j784s4-evm.dts | 8 ++++++++
>  2 files changed, 16 insertions(+)
> ---
> base-commit: 9aaeb87ce1e966169a57f53a02ba05b30880ffb8
> change-id: 20240906-j784s4-tps6594-bootph-19d3f00fb98a
> 
> Best regards,
> -- 
> Andrew Halaney <ahalaney@...hat.com>
>