linux-kernel - Re: [PATCH v6 5/5] mfd: tps6586x: register restart handler

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Message-ID: <20230518094434.GD404509@google.com>
Date:   Thu, 18 May 2023 10:44:34 +0100
From:   Lee Jones <lee@...nel.org>
To:     Benjamin Bara <bbara93@...il.com>
Cc:     Wolfram Sang <wsa@...nel.org>, rafael.j.wysocki@...el.com,
        dmitry.osipenko@...labora.com, peterz@...radead.org,
        jonathanh@...dia.com, richard.leitner@...ux.dev,
        treding@...dia.com, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        Benjamin Bara <benjamin.bara@...data.com>
Subject: Re: [PATCH v6 5/5] mfd: tps6586x: register restart handler

On Tue, 09 May 2023, Benjamin Bara wrote:

> From: Benjamin Bara <benjamin.bara@...data.com>
> 
> There are a couple of boards which use a tps6586x as
> "ti,system-power-controller", e.g. the tegra20-tamonten.dtsi.
> For these, the only registered restart handler is the warm reboot via
> tegra's PMC. As the bootloader of the tegra20 requires the VDE, it must
> be ensured that VDE is enabled (which is the case after a cold reboot).
> For the "normal reboot", this is basically the case since 8f0c714ad9be.
> However, this workaround is not executed in case of an emergency restart.
> In case of an emergency restart, the system now simply hangs in the
> bootloader, as VDE is not enabled (because it is not used).
> 
> The TPS658629-Q1 provides a SOFT RST bit in the SUPPLYENE reg to request
> a (cold) reboot, which takes at least 20ms (as the data sheet states).
> This avoids the hang-up.
> 
> Tested on a TPS658640.
> 
> Signed-off-by: Benjamin Bara <benjamin.bara@...data.com>
> ---
>  drivers/mfd/tps6586x.c | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)

I plan to apply the whole set once you have all required Acks.

For my own reference (apply this as-is to your sign-off block):

Acked-for-MFD-by: Lee Jones <lee@...nel.org>

-- 
Lee Jones [李琼斯]