This commit extends the cpufreq-dt driver to take a platform_data
structure. This structure is for now used to tell the cpufreq-dt
driver the layout of the clocks on the platform, i.e whether all CPUs
share the same clock or whether each CPU has a separate clock.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
---
drivers/cpufreq/cpufreq-dt.c | 20 ++++++++++++++++++--
include/linux/cpufreq-dt.h | 22 ++++++++++++++++++++++
2 files changed, 40 insertions(+), 2 deletions(-)
create mode 100644 include/linux/cpufreq-dt.h
diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index e002650..35d396e 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -18,6 +18,7 @@
#include <linux/cpu.h>
#include <linux/cpu_cooling.h>
#include <linux/cpufreq.h>
+#include <linux/cpufreq-dt.h>
#include <linux/cpumask.h>
#include <linux/err.h>
#include <linux/module.h>
@@ -28,6 +29,9 @@
#include <linux/slab.h>
#include <linux/thermal.h>
+/* cpufreq_driver->flags values */
+#define CPUFREQ_DT_INDEPENDENT_CLOCKS (1 << 16)
+
struct private_data {
struct device *cpu_dev;
struct regulator *cpu_reg;
@@ -266,9 +270,17 @@ static int cpufreq_init(struct cpufreq_policy *policy)
policy->driver_data = priv;
policy->clk = cpu_clk;
- ret = cpufreq_generic_init(policy, freq_table, transition_latency);
- if (ret)
+ ret = cpufreq_table_validate_and_show(policy, freq_table);
+ if (ret) {
+ dev_err(cpu_dev, "%s: invalid frequency table: %d\n", __func__,
+ ret);
goto out_cooling_unregister;
+ }
+
+ policy->cpuinfo.transition_latency = transition_latency;
+
+ if (!(cpufreq_get_driver_flags() & CPUFREQ_DT_INDEPENDENT_CLOCKS))
+ cpumask_setall(policy->cpus);
return 0;
@@ -314,6 +326,7 @@ static struct cpufreq_driver dt_cpufreq_driver = {
static int dt_cpufreq_probe(struct platform_device *pdev)
{
+ struct cpufreq_dt_platform_data *pd = dev_get_platdata(&pdev->dev);
struct device *cpu_dev;
struct regulator *cpu_reg;
struct clk *cpu_clk;
@@ -334,6 +347,9 @@ static int dt_cpufreq_probe(struct platform_device *pdev)
if (!IS_ERR(cpu_reg))
regulator_put(cpu_reg);
+ if (pd->independent_clocks)
+ dt_cpufreq_driver.flags |= CPUFREQ_DT_INDEPENDENT_CLOCKS;
+
ret = cpufreq_register_driver(&dt_cpufreq_driver);
if (ret)
dev_err(cpu_dev, "failed register driver: %d\n", ret);
diff --git a/include/linux/cpufreq-dt.h b/include/linux/cpufreq-dt.h
new file mode 100644
index 0000000..0414009
--- /dev/null
+++ b/include/linux/cpufreq-dt.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2014 Marvell
+ * Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#ifndef __CPUFREQ_DT_H__
+#define __CPUFREQ_DT_H__
+
+struct cpufreq_dt_platform_data {
+ /*
+ * True when each CPU has its own clock to control its
+ * frequency, false when all CPUs are controlled by a single
+ * clock.
+ */
+ bool independent_clocks;
+};
+
+#endif /* __CPUFREQ_DT_H__ */
--
2.0.0
--
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