phy: Add configuration interface

The phy framework is only allowing to configure the power state of the PHY
using the init and power_on hooks, and their power_off and exit
counterparts.

While it works for most, simple, PHYs supported so far, some more advanced
PHYs need some configuration depending on runtime parameters. These PHYs
have been supported by a number of means already, often by using ad-hoc
drivers in their consumer drivers.

That doesn't work too well however, when a consumer device needs to deal
with multiple PHYs, or when multiple consumers need to deal with the same
PHY (a DSI driver and a CSI driver for example).

So we'll add a new interface, through two funtions, phy_validate and
phy_configure. The first one will allow to check that a current
configuration, for a given mode, is applicable. It will also allow the PHY
driver to tune the settings given as parameters as it sees fit.

phy_configure will actually apply that configuration in the phy itself.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index df3d4ba516ab..19b05e824ee4 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -408,6 +408,70 @@ int phy_calibrate(struct phy *phy)
 EXPORT_SYMBOL_GPL(phy_calibrate);
 
 /**
+ * phy_configure() - Changes the phy parameters
+ * @phy: the phy returned by phy_get()
+ * @opts: New configuration to apply
+ *
+ * Used to change the PHY parameters. phy_init() must have been called
+ * on the phy. The configuration will be applied on the current phy
+ * mode, that can be changed using phy_set_mode().
+ *
+ * Returns: 0 if successful, an negative error code otherwise
+ */
+int phy_configure(struct phy *phy, union phy_configure_opts *opts)
+{
+	int ret;
+
+	if (!phy)
+		return -EINVAL;
+
+	if (!phy->ops->configure)
+		return -EOPNOTSUPP;
+
+	mutex_lock(&phy->mutex);
+	ret = phy->ops->configure(phy, opts);
+	mutex_unlock(&phy->mutex);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(phy_configure);
+
+/**
+ * phy_validate() - Checks the phy parameters
+ * @phy: the phy returned by phy_get()
+ * @mode: phy_mode the configuration is applicable to.
+ * @submode: PHY submode the configuration is applicable to.
+ * @opts: Configuration to check
+ *
+ * Used to check that the current set of parameters can be handled by
+ * the phy. Implementations are free to tune the parameters passed as
+ * arguments if needed by some implementation detail or
+ * constraints. It will not change any actual configuration of the
+ * PHY, so calling it as many times as deemed fit will have no side
+ * effect.
+ *
+ * Returns: 0 if successful, an negative error code otherwise
+ */
+int phy_validate(struct phy *phy, enum phy_mode mode, int submode,
+		 union phy_configure_opts *opts)
+{
+	int ret;
+
+	if (!phy)
+		return -EINVAL;
+
+	if (!phy->ops->validate)
+		return -EOPNOTSUPP;
+
+	mutex_lock(&phy->mutex);
+	ret = phy->ops->validate(phy, mode, submode, opts);
+	mutex_unlock(&phy->mutex);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(phy_validate);
+
+/**
  * _of_phy_get() - lookup and obtain a reference to a phy by phandle
  * @np: device_node for which to get the phy
  * @index: the index of the phy