linux-kernel - Re: [PATCH v2 1/3] power: reset: read priority from device tree

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Message-ID: <CAL85gmBq30pWxP0buKbM8so6QqsJq2YojiSK1EWtMPsH_7foeg@mail.gmail.com>
Date:	Mon, 1 Dec 2014 09:15:21 -0800
From:	Feng Kan <fkan@....com>
To:	Stefan Agner <stefan@...er.ch>
Cc:	shawn.guo@...aro.org, kernel@...gutronix.de,
	Guenter Roeck <linux@...ck-us.net>,
	Arnd Bergmann <arnd@...db.de>, sre@...nel.org,
	grant.likely@...aro.org, robh+dt@...nel.org,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] power: reset: read priority from device tree

On Mon, Dec 1, 2014 at 9:03 AM, Stefan Agner <stefan@...er.ch> wrote:
> This patch adds an optional property which allows to specify the
> reset source priority. This priority is used by the kernel restart
> handler call chain to sort out the proper reset/restart method.
> Depending on the power design of a board or other machine/board
> specific peculiarity, it is not possible to pick a generic priority.
>
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
>  Documentation/devicetree/bindings/power/reset/syscon-reboot.txt | 3 +++
>  drivers/power/reset/syscon-reboot.c                             | 5 ++++-
>  2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt b/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt
> index 1190631..ee41d9c 100644
> --- a/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt
> +++ b/Documentation/devicetree/bindings/power/reset/syscon-reboot.txt
> @@ -11,6 +11,9 @@ Required properties:
>  - offset: offset in the register map for the reboot register (in bytes)
>  - mask: the reset value written to the reboot register (32 bit access)
>
> +Optional properties:
> +- priority: define the priority of the reset (0-255, defaults to 128)
> +
>  Default will be little endian mode, 32 bit access only.
>
>  Examples:
> diff --git a/drivers/power/reset/syscon-reboot.c b/drivers/power/reset/syscon-reboot.c
> index 815b901..3060d6b 100644
> --- a/drivers/power/reset/syscon-reboot.c
> +++ b/drivers/power/reset/syscon-reboot.c
> @@ -67,8 +67,11 @@ static int syscon_reboot_probe(struct platform_device *pdev)
>         if (of_property_read_u32(pdev->dev.of_node, "mask", &ctx->mask))
>                 return -EINVAL;
>
> -       ctx->restart_handler.notifier_call = syscon_restart_handle;
>         ctx->restart_handler.priority = 128;
> +       of_property_read_u32(pdev->dev.of_node, "priority",
> +                            &ctx->restart_handler.priority);

What is this for?
> +
> +       ctx->restart_handler.notifier_call = syscon_restart_handle;
>         err = register_restart_handler(&ctx->restart_handler);
>         if (err)
>                 dev_err(dev, "can't register restart notifier (err=%d)\n", err);
> --
> 2.1.3
>
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