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Message-ID: <20160202061228.GE31828@vireshk>
Date: Tue, 2 Feb 2016 11:42:28 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Rafael Wysocki <rjw@...ysocki.net>
Cc: linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
Stephen Boyd <sboyd@...eaurora.org>, nm@...com,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 16/16] cpufreq: dt: No need to allocate resources
anymore
On 28-01-16, 13:50, Viresh Kumar wrote:
> OPP layer manages it now and cpufreq-dt driver doesn't need it. But, we
> still need to check for availability of resources for deferred probing.
>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Got updated due to 11/16 ..
-------------------------8<-------------------------
From: Viresh Kumar <viresh.kumar@...aro.org>
Date: Wed, 9 Sep 2015 10:41:26 +0530
Subject: [PATCH 09/20] cpufreq: dt: No need to allocate resources anymore
OPP layer manages it now and cpufreq-dt driver doesn't need it. But, we
still need to check for availability of resources for deferred probing.
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---
drivers/cpufreq/cpufreq-dt.c | 116 ++++++++++++++++++-------------------------
1 file changed, 48 insertions(+), 68 deletions(-)
diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 3c43fda48bdf..1beb484b4bbe 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -31,7 +31,6 @@
struct private_data {
struct device *cpu_dev;
- struct regulator *cpu_reg;
struct thermal_cooling_device *cdev;
const char *reg_name;
};
@@ -88,73 +87,61 @@ static const char *find_supply_name(struct device *dev)
return name;
}
-static int allocate_resources(int cpu, struct device **cdev,
- struct regulator **creg, struct clk **cclk)
+static int resources_available(void)
{
struct device *cpu_dev;
struct regulator *cpu_reg;
struct clk *cpu_clk;
int ret = 0;
- char *reg_cpu0 = "cpu0", *reg_cpu = "cpu", *reg;
+ const char *name;
- cpu_dev = get_cpu_device(cpu);
+ cpu_dev = get_cpu_device(0);
if (!cpu_dev) {
- pr_err("failed to get cpu%d device\n", cpu);
+ pr_err("failed to get cpu0 device\n");
return -ENODEV;
}
- /* Try "cpu0" for older DTs */
- if (!cpu)
- reg = reg_cpu0;
- else
- reg = reg_cpu;
-
-try_again:
- cpu_reg = regulator_get_optional(cpu_dev, reg);
- ret = PTR_ERR_OR_ZERO(cpu_reg);
+ cpu_clk = clk_get(cpu_dev, NULL);
+ ret = PTR_ERR_OR_ZERO(cpu_clk);
if (ret) {
/*
- * If cpu's regulator supply node is present, but regulator is
- * not yet registered, we should try defering probe.
+ * If cpu's clk node is present, but clock is not yet
+ * registered, we should try defering probe.
*/
- if (ret == -EPROBE_DEFER) {
- dev_dbg(cpu_dev, "cpu%d regulator not ready, retry\n",
- cpu);
- return ret;
- }
-
- /* Try with "cpu-supply" */
- if (reg == reg_cpu0) {
- reg = reg_cpu;
- goto try_again;
- }
+ if (ret == -EPROBE_DEFER)
+ dev_dbg(cpu_dev, "clock not ready, retry\n");
+ else
+ dev_err(cpu_dev, "failed to get clock: %d\n", ret);
- dev_dbg(cpu_dev, "no regulator for cpu%d: %d\n", cpu, ret);
+ return ret;
}
- cpu_clk = clk_get(cpu_dev, NULL);
- ret = PTR_ERR_OR_ZERO(cpu_clk);
- if (ret) {
- /* put regulator */
- if (!IS_ERR(cpu_reg))
- regulator_put(cpu_reg);
+ clk_put(cpu_clk);
+
+ name = find_supply_name(cpu_dev);
+ if (IS_ERR(name))
+ return PTR_ERR(name);
+
+ if (!name)
+ return 0;
+ cpu_reg = regulator_get_optional(cpu_dev, name);
+ ret = PTR_ERR_OR_ZERO(cpu_reg);
+ if (ret) {
/*
- * If cpu's clk node is present, but clock is not yet
- * registered, we should try defering probe.
+ * If cpu's regulator supply node is present, but regulator is
+ * not yet registered, we should try defering probe.
*/
if (ret == -EPROBE_DEFER)
- dev_dbg(cpu_dev, "cpu%d clock not ready, retry\n", cpu);
+ dev_dbg(cpu_dev, "cpu0 regulator not ready, retry\n");
else
- dev_err(cpu_dev, "failed to get cpu%d clock: %d\n", cpu,
- ret);
- } else {
- *cdev = cpu_dev;
- *creg = cpu_reg;
- *cclk = cpu_clk;
+ dev_dbg(cpu_dev, "no regulator for cpu0: %d\n", ret);
+
+ return ret;
}
- return ret;
+ regulator_put(cpu_reg);
+ return 0;
}
static int cpufreq_init(struct cpufreq_policy *policy)
@@ -162,7 +149,6 @@ static int cpufreq_init(struct cpufreq_policy *policy)
struct cpufreq_frequency_table *freq_table;
struct private_data *priv;
struct device *cpu_dev;
- struct regulator *cpu_reg;
struct clk *cpu_clk;
struct dev_pm_opp *suspend_opp;
unsigned int transition_latency;
@@ -170,9 +156,16 @@ static int cpufreq_init(struct cpufreq_policy *policy)
const char *name = NULL;
int ret;
- ret = allocate_resources(policy->cpu, &cpu_dev, &cpu_reg, &cpu_clk);
- if (ret) {
- pr_err("%s: Failed to allocate resources: %d\n", __func__, ret);
+ cpu_dev = get_cpu_device(policy->cpu);
+ if (!cpu_dev) {
+ pr_err("failed to get cpu%d device\n", policy->cpu);
+ return -ENODEV;
+ }
+
+ cpu_clk = clk_get(cpu_dev, NULL);
+ if (IS_ERR(cpu_clk)) {
+ ret = PTR_ERR(cpu_clk);
+ dev_err(cpu_dev, "%s: failed to get clk: %d\n", __func__, ret);
return ret;
}
@@ -186,7 +179,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
if (ret == -ENOENT)
opp_v1 = true;
else
- goto out_put_reg_clk;
+ goto out_put_clk;
}
/*
@@ -196,7 +189,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
name = find_supply_name(cpu_dev);
if (IS_ERR(name)) {
ret = PTR_ERR(name);
- goto out_put_reg_clk;
+ goto out_put_clk;
}
if (name) {
@@ -204,7 +197,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
if (ret) {
dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n",
policy->cpu, ret);
- goto out_put_reg_clk;
+ goto out_put_clk;
}
}
@@ -262,9 +255,7 @@ static int cpufreq_init(struct cpufreq_policy *policy)
}
priv->cpu_dev = cpu_dev;
- priv->cpu_reg = cpu_reg;
policy->driver_data = priv;
-
policy->clk = cpu_clk;
rcu_read_lock();
@@ -305,10 +296,8 @@ static int cpufreq_init(struct cpufreq_policy *policy)
dev_pm_opp_of_cpumask_remove_table(policy->cpus);
if (name)
dev_pm_opp_put_regulator(cpu_dev);
-out_put_reg_clk:
+out_put_clk:
clk_put(cpu_clk);
- if (!IS_ERR(cpu_reg))
- regulator_put(cpu_reg);
return ret;
}
@@ -324,8 +313,6 @@ static int cpufreq_exit(struct cpufreq_policy *policy)
dev_pm_opp_put_regulator(priv->cpu_dev);
clk_put(policy->clk);
- if (!IS_ERR(priv->cpu_reg))
- regulator_put(priv->cpu_reg);
kfree(priv);
return 0;
@@ -378,9 +365,6 @@ static struct cpufreq_driver dt_cpufreq_driver = {
static int dt_cpufreq_probe(struct platform_device *pdev)
{
- struct device *cpu_dev;
- struct regulator *cpu_reg;
- struct clk *cpu_clk;
int ret;
/*
@@ -390,19 +374,15 @@ static int dt_cpufreq_probe(struct platform_device *pdev)
*
* FIXME: Is checking this only for CPU0 sufficient ?
*/
- ret = allocate_resources(0, &cpu_dev, &cpu_reg, &cpu_clk);
+ ret = resources_available();
if (ret)
return ret;
- clk_put(cpu_clk);
- if (!IS_ERR(cpu_reg))
- regulator_put(cpu_reg);
-
dt_cpufreq_driver.driver_data = dev_get_platdata(&pdev->dev);
ret = cpufreq_register_driver(&dt_cpufreq_driver);
if (ret)
- dev_err(cpu_dev, "failed register driver: %d\n", ret);
+ dev_err(&pdev->dev, "failed register driver: %d\n", ret);
return ret;
}
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