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Commit 0a2266d2 authored by Junjie Wu's avatar Junjie Wu Committed by Gerrit - the friendly Code Review server
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devfreq: devfreq_simple_dev: Add support for preparing device clock 



For certain implementation, device clock needs to be prepared before
rate voting taking effect. Add support for preparing device clock
during initialization.

Change-Id: Ib22e83952187118342ff2546d4c79d3970a288f9
Signed-off-by: default avatarJunjie Wu <junjiew@codeaurora.org>
parent 331e7f8c

Documentation/devicetree/bindings/devfreq/devfreq-simple-dev.txt

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ Required properties: 
Optional properties:

- polling-ms:	Polling interval for the device in milliseconds. Default: 50

- governor:	Initial governor to user for the device. Default: "performance"

- qcom,prepare-clk:	Prepare the device clock during initialization.



Example:

drivers/devfreq/devfreq_simple_dev.c

+14 −3
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2014, The Linux Foundation. All rights reserved.

 * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -146,12 +146,23 @@ static int devfreq_clock_probe(struct platform_device *pdev) 
	if (of_property_read_string(dev->of_node, "governor", &gov_name))

		gov_name = "performance";



	if (of_property_read_bool(dev->of_node, "qcom,prepare-clk")) {

		ret = clk_prepare(d->clk);

		if (ret)

			return ret;

	}



	d->df = devfreq_add_device(dev, p, gov_name, NULL);

	if (IS_ERR(d->df))

		return PTR_ERR(d->df);

	if (IS_ERR(d->df)) {

		ret = PTR_ERR(d->df);

		goto add_err;

	}



	return 0;

add_err:

	if (of_property_read_bool(dev->of_node, "qcom,prepare-clk"))

		clk_unprepare(d->clk);

	return ret;

}



static int devfreq_clock_remove(struct platform_device *pdev)