linux-kernel - Re: [PATCH v14 02/10] power: reset: reboot-mode: Add device tree node-based registration

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Message-ID: <3c56cd00-770f-019a-d93b-5ebaa6b9374d@oss.qualcomm.com>
Date: Wed, 17 Sep 2025 21:59:44 +0530
From: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
To: Sebastian Reichel <sebastian.reichel@...labora.com>
Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Souvik Chakravarty <Souvik.Chakravarty@....com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Andy Yan <andy.yan@...k-chips.com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Konrad Dybcio <konradybcio@...nel.org>,
        cros-qcom-dts-watchers@...omium.org, Vinod Koul <vkoul@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Florian Fainelli <florian.fainelli@...adcom.com>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Mukesh Ojha <mukesh.ojha@....qualcomm.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Andre Draszik
 <andre.draszik@...aro.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        Elliot Berman <quic_eberman@...cinc.com>,
        Srinivas Kandagatla <srini@...nel.org>
Subject: Re: [PATCH v14 02/10] power: reset: reboot-mode: Add device tree
 node-based registration



On 9/17/2025 12:18 AM, Sebastian Reichel wrote:
> Hi,
> 
> On Fri, Aug 15, 2025 at 08:05:07PM +0530, Shivendra Pratap wrote:
>> The reboot-mode driver does not have a strict requirement for
>> device-based registration. It primarily uses the device's of_node
>> to read mode-<cmd> properties and the device pointer for logging.
>>
>> Remove the dependency on struct device and introduce support for
>> Device Tree (DT) node-based registration. This enables drivers
>> that are not associated with a struct device to leverage the
>> reboot-mode framework.
>>
>> Signed-off-by: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
>> ---
> 
> Please use fwnode instead of device_node, so that the same thing
> can be used with non DT setups, if that becomes necessary. Otherwise
> LGTM.

To be more clear on this, have one question: the current unmodified
design of reboot-mode is dt based:

struct device_node *np = reboot->dev->of_node;
and then parses the node using for_each_property_of_node(np, prop).

We want to refactor reboot-mode to support non-DT setups by adding
support for fwnode-based approach (struct fwnode_handle *fwnode)?

Can you please explain a bit? Some more details would be helpful to
make the change.

thanks,
Shivendra