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Commit f56aad1d authored by Viresh Kumar's avatar Viresh Kumar Committed by Rafael J. Wysocki
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cpufreq: dt: Add generic platform-device creation support 



Multiple platforms are using the generic cpufreq-dt driver now, and all
of them are required to create a platform device with name "cpufreq-dt",
in order to get the cpufreq-dt probed.

Many of them do it from platform code, others have special drivers just
to do that.

It would be more sensible to do this at a generic place, where all such
platform can mark their entries.

This patch adds a separate file to get this device created. Currently
the compat list of platforms that we support is empty, and will be
filled in as and when we move platforms to use it.

It always compiles as part of the kernel and so doesn't need a
module-exit operation.

Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 7e67e239

drivers/cpufreq/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -225,6 +225,7 @@ config CPUFREQ_DT 
	depends on HAVE_CLK && OF

	# if CPU_THERMAL is on and THERMAL=m, CPUFREQ_DT cannot be =y:

	depends on !CPU_THERMAL || THERMAL

	select CPUFREQ_DT_PLATDEV

	select PM_OPP

	help

	  This adds a generic DT based cpufreq driver for frequency management.
@@ -233,6 +234,15 @@ config CPUFREQ_DT 


	  If in doubt, say N.



config CPUFREQ_DT_PLATDEV

	bool

	help

	  This adds a generic DT based cpufreq platdev driver for frequency

	  management.  This creates a 'cpufreq-dt' platform device, on the

	  supported platforms.



	  If in doubt, say N.



if X86

source "drivers/cpufreq/Kconfig.x86"

endif

drivers/cpufreq/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ obj-$(CONFIG_CPU_FREQ_GOV_COMMON) += cpufreq_governor.o 
obj-$(CONFIG_CPU_FREQ_GOV_ATTR_SET)	+= cpufreq_governor_attr_set.o



obj-$(CONFIG_CPUFREQ_DT)		+= cpufreq-dt.o

obj-$(CONFIG_CPUFREQ_DT_PLATDEV)	+= cpufreq-dt-platdev.o



##################################################################################

# x86 drivers.

drivers/cpufreq/cpufreq-dt-platdev.c

0 → 100644
+32 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2016 Linaro.

 * Viresh Kumar <viresh.kumar@linaro.org>

 *

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

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 */



#include <linux/err.h>

#include <linux/of.h>

#include <linux/platform_device.h>



static const struct of_device_id machines[] = {

};



static int __init cpufreq_dt_platdev_init(void)

{

	struct device_node *np = of_find_node_by_path("/");



	if (!np)

		return -ENODEV;



	if (!of_match_node(machines, np))

		return -ENODEV;



	of_node_put(of_root);



	return PTR_ERR_OR_ZERO(platform_device_register_simple("cpufreq-dt", -1,

							       NULL, 0));

}

device_initcall(cpufreq_dt_platdev_init);