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: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

3 files changed, 43 insertions, 0 deletions

diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index 5d74826d75be..b38d5028a03e 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -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
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 6d1186701a9c..d7b646c0f2e9 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -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.
diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
new file mode 100644
index 000000000000..2a3532427ecf
--- /dev/null
+++ b/drivers/cpufreq/cpufreq-dt-platdev.c
@@ -0,0 +1,32 @@
+/*
+ * 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);