linux-kernel - Re: [PATCH v12 1/8] power: reset: reboot-mode: Add device tree node-based registration

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Message-ID: <33gq4iyx5jxrr6f5w3ctgy7l7om53jdvb4tmfmxzourhfvpc3t@cr5re2dab4tc>
Date: Tue, 22 Jul 2025 00:36:56 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
Cc: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Sebastian Reichel <sre@...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>,
        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 v12 1/8] power: reset: reboot-mode: Add device tree
 node-based registration

On Mon, Jul 21, 2025 at 11:58:48PM +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>
> ---
>  drivers/power/reset/reboot-mode.c | 45 +++++++++++++++++++++++++++++----------
>  include/linux/reboot-mode.h       |  6 +++++-
>  2 files changed, 39 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/power/reset/reboot-mode.c b/drivers/power/reset/reboot-mode.c
> index fba53f638da04655e756b5f8b7d2d666d1379535..5dd3f06ca88cb28606d9fd2100ce03383c14d215 100644
> --- a/drivers/power/reset/reboot-mode.c
> +++ b/drivers/power/reset/reboot-mode.c
> @@ -3,13 +3,17 @@
>   * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd
>   */
>  
> +#define pr_fmt(fmt)	"reboot-mode: " fmt
> +
>  #include <linux/device.h>
>  #include <linux/init.h>
>  #include <linux/kernel.h>
> +#include <linux/list.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/reboot.h>
>  #include <linux/reboot-mode.h>
> +#include <linux/slab.h>
>  
>  #define PREFIX "mode-"
>  
> @@ -55,7 +59,9 @@ static int reboot_mode_notify(struct notifier_block *this,
>  	unsigned int magic;
>  
>  	reboot = container_of(this, struct reboot_mode_driver, reboot_notifier);
> +	mutex_lock(&reboot->rb_lock);

This one should go into the get_reboot_mode_magic() function, otherwise
it's not obvious why do you need it here.

Also, please split mutex addition to a separate patch.

>  	magic = get_reboot_mode_magic(reboot, cmd);
> +	mutex_unlock(&reboot->rb_lock);
>  	if (magic)
>  		reboot->write(reboot, magic);
>  

-- 
With best wishes
Dmitry