OPP: Add support for config_regulators() helper

Extend the dev_pm_opp_set_config() interface to allow adding
config_regulators() helpers. This helper will be called to set the
voltages of the regulators from the regular path in _set_opp(), while we
are trying to change the OPP.

This will eventually replace the custom set_opp() helper.

Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

2 files changed, 69 insertions, 1 deletions

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 1745e25c1eaf..12bae79564f1 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1185,6 +1185,17 @@ static int _set_opp(struct device *dev, struct opp_table *opp_table,
 			dev_err(dev, "Failed to set bw: %d\n", ret);
 			return ret;
 		}
+
+		if (opp_table->config_regulators) {
+			ret = opp_table->config_regulators(dev, old_opp, opp,
+							   opp_table->regulators,
+							   opp_table->regulator_count);
+			if (ret) {
+				dev_err(dev, "Failed to set regulator voltages: %d\n",
+					ret);
+				return ret;
+			}
+		}
 	}
 
 	if (opp_table->set_opp) {
@@ -1202,6 +1213,17 @@ static int _set_opp(struct device *dev, struct opp_table *opp_table,
 
 	/* Scaling down? Configure required OPPs after frequency */
 	if (scaling_down) {
+		if (opp_table->config_regulators) {
+			ret = opp_table->config_regulators(dev, old_opp, opp,
+							   opp_table->regulators,
+							   opp_table->regulator_count);
+			if (ret) {
+				dev_err(dev, "Failed to set regulator voltages: %d\n",
+					ret);
+				return ret;
+			}
+		}
+
 		ret = _set_opp_bw(opp_table, opp, dev);
 		if (ret) {
 			dev_err(dev, "Failed to set bw: %d\n", ret);
@@ -2268,6 +2290,38 @@ static void _opp_unregister_set_opp_helper(struct opp_table *opp_table)
 	}
 }
 
+/**
+ * _opp_set_config_regulators_helper() - Register custom set regulator helper.
+ * @dev: Device for which the helper is getting registered.
+ * @config_regulators: Custom set regulator helper.
+ *
+ * This is useful to support platforms with multiple regulators per device.
+ *
+ * This must be called before any OPPs are initialized for the device.
+ */
+static int _opp_set_config_regulators_helper(struct opp_table *opp_table,
+		struct device *dev, config_regulators_t config_regulators)
+{
+	/* Another CPU that shares the OPP table has set the helper ? */
+	if (!opp_table->config_regulators)
+		opp_table->config_regulators = config_regulators;
+
+	return 0;
+}
+
+/**
+ * _opp_put_config_regulators_helper() - Releases resources blocked for
+ *					 config_regulators helper.
+ * @opp_table: OPP table returned from _opp_set_config_regulators_helper().
+ *
+ * Release resources blocked for platform specific config_regulators helper.
+ */
+static void _opp_put_config_regulators_helper(struct opp_table *opp_table)
+{
+	if (opp_table->config_regulators)
+		opp_table->config_regulators = NULL;
+}
+
 static void _detach_genpd(struct opp_table *opp_table)
 {
 	int index;
@@ -2394,8 +2448,10 @@ static void _opp_clear_config(struct opp_config_data *data)
 		_opp_put_regulators(data->opp_table);
 	if (data->flags & OPP_CONFIG_SUPPORTED_HW)
 		_opp_put_supported_hw(data->opp_table);
-	if (data->flags & OPP_CONFIG_REGULATOR_HELPER)
+	if (data->flags & OPP_CONFIG_REGULATOR_HELPER) {
+		_opp_put_config_regulators_helper(data->opp_table);
 		_opp_unregister_set_opp_helper(data->opp_table);
+	}
 	if (data->flags & OPP_CONFIG_PROP_NAME)
 		_opp_put_prop_name(data->opp_table);
 	if (data->flags & OPP_CONFIG_CLK)
@@ -2476,6 +2532,16 @@ int dev_pm_opp_set_config(struct device *dev, struct dev_pm_opp_config *config)
 		data->flags |= OPP_CONFIG_REGULATOR_HELPER;
 	}
 
+	/* Configure config_regulators helper */
+	if (config->config_regulators) {
+		ret = _opp_set_config_regulators_helper(opp_table, dev,
+						config->config_regulators);
+		if (ret)
+			goto err;
+
+		data->flags |= OPP_CONFIG_REGULATOR_HELPER;
+	}
+
 	/* Configure supported hardware */
 	if (config->supported_hw) {
 		ret = _opp_set_supported_hw(opp_table, config->supported_hw,
diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
index d652f0cc84f1..45fd40737159 100644
--- a/drivers/opp/opp.h
+++ b/drivers/opp/opp.h
@@ -172,6 +172,7 @@ enum opp_table_access {
  * @prop_name: A name to postfix to many DT properties, while parsing them.
  * @clk_configured: Clock name is configured by the platform.
  * @clk: Device's clock handle
+ * @config_regulators: Platform specific config_regulators() callback.
  * @regulators: Supply regulators
  * @regulator_count: Number of power supply regulators. Its value can be -1
  * (uninitialized), 0 (no opp-microvolt property) or > 0 (has opp-microvolt
@@ -224,6 +225,7 @@ struct opp_table {
 	const char *prop_name;
 	bool clk_configured;
 	struct clk *clk;
+	config_regulators_t config_regulators;
 	struct regulator **regulators;
 	int regulator_count;
 	struct icc_path **paths;