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

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Date:	Mon,  1 Dec 2014 18:03:07 +0100
From:	Stefan Agner <stefan@...er.ch>
To:	shawn.guo@...aro.org, kernel@...gutronix.de, linux@...ck-us.net,
	arnd@...db.de, sre@...nel.org, fkan@....com,
	grant.likely@...aro.org, robh+dt@...nel.org
Cc:	dbaryshkov@...il.com, dwmw2@...radead.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, stefan@...er.ch
Subject: [PATCH v2 1/3] power: reset: read priority from device tree

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);
+
+	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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