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Subject[PATCH 4/4] cpufreq: dt: Add support for interconnect bandwidth scaling
Date
In addition to clocks and regulators, some devices can scale the bandwidth
of their on-chip interconnect - for example between CPU and DDR memory. Add
support for that, so that platforms which support it can make use of it.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
---
drivers/cpufreq/cpufreq-dt.c | 27 ++++++++++++++++++++++++++-
1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index e58bfcb1169e..30fed0fc266d 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -17,6 +17,7 @@
#include <linux/cpufreq.h>
#include <linux/cpumask.h>
#include <linux/err.h>
+#include <linux/interconnect.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm_opp.h>
@@ -100,6 +101,7 @@ static int resources_available(void)
struct device *cpu_dev;
struct regulator *cpu_reg;
struct clk *cpu_clk;
+ struct icc_path *cpu_path;
int ret = 0;
const char *name;

@@ -126,6 +128,19 @@ static int resources_available(void)

clk_put(cpu_clk);

+ cpu_path = of_icc_get(cpu_dev, NULL);
+ ret = PTR_ERR_OR_ZERO(cpu_path);
+ if (ret) {
+ if (ret == -EPROBE_DEFER)
+ dev_dbg(cpu_dev, "defer icc path: %d\n", ret);
+ else
+ dev_err(cpu_dev, "failed to get icc path: %d\n", ret);
+
+ return ret;
+ }
+
+ icc_put(cpu_path);
+
name = find_supply_name(cpu_dev);
/* Platform doesn't require regulator */
if (!name)
@@ -205,10 +220,18 @@ static int cpufreq_init(struct cpufreq_policy *policy)
}
}

+ opp_table = dev_pm_opp_set_path(cpu_dev, NULL);
+ if (IS_ERR(opp_table)) {
+ ret = PTR_ERR(opp_table);
+ dev_err(cpu_dev, "Failed to set interconnect path for cpu%d: %d\n",
+ policy->cpu, ret);
+ goto out_put_regulator;
+ }
+
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv) {
ret = -ENOMEM;
- goto out_put_regulator;
+ goto out_put_path;
}

priv->reg_name = name;
@@ -288,6 +311,8 @@ static int cpufreq_init(struct cpufreq_policy *policy)
if (priv->have_static_opps)
dev_pm_opp_of_cpumask_remove_table(policy->cpus);
kfree(priv);
+out_put_path:
+ dev_pm_opp_put_path(opp_table);
out_put_regulator:
if (name)
dev_pm_opp_put_regulators(opp_table);
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