From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: Elliot Berman <quic_eberman@quicinc.com>,
Bjorn Andersson <andersson@kernel.org>,
Konrad Dybcio <konrad.dybcio@linaro.org>,
Sebastian Reichel <sre@kernel.org>, Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>,
Vinod Koul <vkoul@kernel.org>,
Andy Yan <andy.yan@rock-chips.com>,
Lorenzo Pieralisi <lpieralisi@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Bartosz Golaszewski <bartosz.golaszewski@linaro.org>,
Satya Durga Srinivasu Prabhala <quic_satyap@quicinc.com>,
Melody Olvera <quic_molvera@quicinc.com>,
Shivendra Pratap <quic_spratap@quicinc.com>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Florian Fainelli <florian.fainelli@broadcom.com>,
linux-pm@vger.kernel.org, linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH v2 2/4] dt-bindings: arm: Document reboot mode magic
Date: Tue, 16 Apr 2024 15:32:02 +0300 [thread overview]
Message-ID: <CAA8EJpqHOWCLg65TSrpy6eh2kFL2=5uu8Kp+WKqu8dLZdowfZA@mail.gmail.com> (raw)
In-Reply-To: <Zh5FKtLVhIH-6R-I@bogus>
On Tue, 16 Apr 2024 at 12:30, Sudeep Holla <sudeep.holla@arm.com> wrote:
>
> On Sun, Apr 14, 2024 at 12:30:25PM -0700, Elliot Berman wrote:
> > Add bindings to describe vendor-specific reboot modes. Values here
> > correspond to valid parameters to vendor-specific reset types in PSCI
> > SYSTEM_RESET2 call.
> >
>
> IIUC, PSCI SYSTEM_RESET will be always supported, so the choice of using
> SYSTEM_RESET2 sounds like a system policy and must not have any information
> in the device tree. All required support from PSCI is discoverable and
> the policy choice must be userspace driven. That's my opinion.
Well, we are talking about the vendor-specific resets, which are not
discoverable. The spec defines them as "implementation defined".
For example, PCSI spec doesn't define a way to add "reset to
bootloader" or "reset to recovery" kinds of resets.
I think the bindings at least should make it clear that the vendor bit
it being set automatically. I won't comment whether this is a good
decision or not.
--
With best wishes
Dmitry
next prev parent reply other threads:[~2024-04-16 12:32 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-14 19:30 [PATCH v2 0/4] Implement vendor resets for PSCI SYSTEM_RESET2 Elliot Berman
2024-04-14 19:30 ` [PATCH v2 1/4] dt-bindings: power: reset: Convert mode-.* properties to array Elliot Berman
2024-04-20 0:50 ` Krzysztof Kozlowski
2024-04-14 19:30 ` [PATCH v2 2/4] dt-bindings: arm: Document reboot mode magic Elliot Berman
2024-04-15 19:34 ` Konrad Dybcio
2024-04-16 9:30 ` Sudeep Holla
2024-04-16 12:32 ` Dmitry Baryshkov [this message]
2024-04-14 19:30 ` [PATCH v2 3/4] firmware: psci: Read and use vendor reset types Elliot Berman
2024-04-15 19:39 ` Konrad Dybcio
2024-04-14 19:30 ` [PATCH v2 4/4] arm64: dts: qcom: Add PSCI SYSTEM_RESET2 types for qcm6490-idp Elliot Berman
2024-04-14 23:13 ` Dmitry Baryshkov
2024-04-15 0:32 ` Elliot Berman
2024-04-15 19:42 ` Konrad Dybcio
2024-04-16 1:11 ` Elliot Berman
2024-04-16 9:35 ` [PATCH v2 0/4] Implement vendor resets for PSCI SYSTEM_RESET2 Sudeep Holla
2024-04-17 17:50 ` Florian Fainelli
2024-04-19 12:38 ` Sudeep Holla
2024-05-02 2:21 ` Elliot Berman
2024-04-17 21:54 ` Elliot Berman
2024-04-17 22:01 ` Florian Fainelli
2024-04-18 17:52 ` Elliot Berman
2024-04-19 8:53 ` Sudeep Holla
2024-04-19 23:31 ` Elliot Berman
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