linux-kernel - Re: [PATCH v3 0/2] arm64: dts: ti: k3-j784s4: Mark tps659413 regulators as bootph-all

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Message-ID: <wl6ri2djky2rkfuaj6hhotzgie6el7leno2qupze6geshp6j4i@g7q5a2rt2cmr>
Date: Thu, 10 Oct 2024 09:56:53 -0500
From: Andrew Halaney <ahalaney@...hat.com>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...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>, Beleswar Prasad Padhi <b-padhi@...com>, 
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/2] arm64: dts: ti: k3-j784s4: Mark tps659413
 regulators as bootph-all

On Mon, Sep 16, 2024 at 12:14:50PM 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>
> ---
> Changes in v3:
> - Added Udit's Tested-by tags
> - Reordered bootph-all to align with dts-coding-style (Beleswar)
> - Link to v2: https://lore.kernel.org/r/20240911-j784s4-tps6594-bootph-v2-0-a83526264ab1@redhat.com

This applies fine still on linux-next, any chance this could be picked
up?

The associated[0] u-boot change is dependent on this and it would be
nice to get the wdog working on mainline u-boot + linux.

[0] https://lore.kernel.org/all/3bf2177d-178f-46bf-abfe-6f00a52c623b@ti.com/