[PATCH 4.4.y-cip 11/23] cpufreq: dt: Pass regulator name to the OPP core


Chen-Yu Tsai (Moxa) <wens@...>
 

From: Viresh Kumar <viresh.kumar@linaro.org>

commit 050794aaebbb9f2c2c50b340b6998273e7c64189 upstream.

OPP core can handle the regulators by itself, and but it needs to know
the name of the regulator to fetch. Add support for that.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Chen-Yu Tsai (Moxa) <wens@csie.org>
---
drivers/cpufreq/cpufreq-dt.c | 46 ++++++++++++++++++++++++++++++++++++
1 file changed, 46 insertions(+)

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 4c9f8a828f6f1..2af75f8088bbb 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -34,6 +34,7 @@ struct private_data {
struct regulator *cpu_reg;
struct thermal_cooling_device *cdev;
unsigned int voltage_tolerance; /* in percentage */
+ const char *reg_name;
};
=20
static struct freq_attr *cpufreq_dt_attr[] =3D {
@@ -119,6 +120,30 @@ static int set_target(struct cpufreq_policy *policy,=
unsigned int index)
return ret;
}
=20
+/*
+ * An earlier version of opp-v1 bindings used to name the regulator
+ * "cpu0-supply", we still need to handle that for backwards compatibili=
ty.
+ */
+static const char *find_supply_name(struct device *dev, struct device_no=
de *np)
+{
+ struct property *pp;
+ int cpu =3D dev->id;
+
+ /* Try "cpu0" for older DTs */
+ if (!cpu) {
+ pp =3D of_find_property(np, "cpu0-supply", NULL);
+ if (pp)
+ return "cpu0";
+ }
+
+ pp =3D of_find_property(np, "cpu-supply", NULL);
+ if (pp)
+ return "cpu";
+
+ dev_dbg(dev, "no regulator for cpu%d\n", cpu);
+ return NULL;
+}
+
static int allocate_resources(int cpu, struct device **cdev,
struct regulator **creg, struct clk **cclk)
{
@@ -200,6 +225,7 @@ static int cpufreq_init(struct cpufreq_policy *policy=
)
unsigned long min_uV =3D ~0, max_uV =3D 0;
unsigned int transition_latency;
bool opp_v1 =3D false;
+ const char *name;
int ret;
=20
ret =3D allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk);
@@ -228,6 +254,20 @@ static int cpufreq_init(struct cpufreq_policy *polic=
y)
goto out_node_put;
}
=20
+ /*
+ * OPP layer will be taking care of regulators now, but it needs to kno=
w
+ * the name of the regulator first.
+ */
+ name =3D find_supply_name(cpu_dev, np);
+ if (name) {
+ ret =3D dev_pm_opp_set_regulator(cpu_dev, name);
+ if (ret) {
+ dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
+ policy->cpu, ret);
+ goto out_node_put;
+ }
+ }
+
/*
* Initialize OPP tables for all policy->cpus. They will be shared by
* all CPUs which have marked their CPUs shared with OPP bindings.
@@ -273,6 +313,7 @@ static int cpufreq_init(struct cpufreq_policy *policy=
)
goto out_free_opp;
}
=20
+ priv->reg_name =3D name;
of_property_read_u32(np, "voltage-tolerance", &priv->voltage_tolerance)=
;
=20
transition_latency =3D dev_pm_opp_get_max_clock_latency(cpu_dev);
@@ -366,6 +407,8 @@ out_free_priv:
kfree(priv);
out_free_opp:
dev_pm_opp_of_cpumask_remove_table(policy->cpus);
+ if (name)
+ dev_pm_opp_put_regulator(cpu_dev);
out_node_put:
of_node_put(np);
out_put_reg_clk:
@@ -383,6 +426,9 @@ static int cpufreq_exit(struct cpufreq_policy *policy=
)
cpufreq_cooling_unregister(priv->cdev);
dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table);
dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
+ if (priv->reg_name)
+ dev_pm_opp_put_regulator(priv->cpu_dev);
+
clk_put(policy->clk);
if (!IS_ERR(priv->cpu_reg))
regulator_put(priv->cpu_reg);
--=20
2.27.0

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