[PATCH v5 4/9] ata: ahci_platform: add support for PHY controller regulator

[Corentin Labbe]

The SoC R40 AHCI controller need a PHY regulator to work.
But since the PHY is embedded in the controller, we cannot do a DT node for it,
since phy-supply works only in node with a PHY compatible.
So this patch adds a way to add an optional phy-supply regulator on AHCI 
controller node.

Signed-off-by: Corentin Labbe <clabbe.montj...@gmail.com>
---
 drivers/ata/ahci.h             |  1 +
 drivers/ata/libahci_platform.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 1415f1012de5..ef356e70e6de 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -353,6 +353,7 @@ struct ahci_host_priv {
        struct reset_control    *rsts;          /* Optional */
        struct regulator        **target_pwrs;  /* Optional */
        struct regulator        *ahci_regulator;/* Optional */
+       struct regulator        *phy_regulator;/* Optional */
        /*
         * If platform uses PHYs. There is a 1:1 relation between the port 
number and
         * the PHY position in this array.
diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index a886b61476a3..dc4d79b1c9ae 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -157,6 +157,12 @@ int ahci_platform_enable_regulators(struct ahci_host_priv 
*hpriv)
                        return rc;
        }
 
+       if (hpriv->phy_regulator) {
+               rc = regulator_enable(hpriv->phy_regulator);
+               if (rc)
+                       goto disable_ahci_pwrs;
+       }
+
        for (i = 0; i < hpriv->nports; i++) {
                if (!hpriv->target_pwrs[i])
                        continue;
@@ -173,6 +179,9 @@ int ahci_platform_enable_regulators(struct ahci_host_priv 
*hpriv)
                if (hpriv->target_pwrs[i])
                        regulator_disable(hpriv->target_pwrs[i]);
 
+       if (hpriv->phy_regulator)
+               regulator_disable(hpriv->phy_regulator);
+disable_ahci_pwrs:
        if (hpriv->ahci_regulator)
                regulator_disable(hpriv->ahci_regulator);
        return rc;
@@ -198,6 +207,8 @@ void ahci_platform_disable_regulators(struct ahci_host_priv 
*hpriv)
 
        if (hpriv->ahci_regulator)
                regulator_disable(hpriv->ahci_regulator);
+       if (hpriv->phy_regulator)
+               regulator_disable(hpriv->phy_regulator);
 }
 EXPORT_SYMBOL_GPL(ahci_platform_disable_regulators);
 /**
@@ -430,6 +441,15 @@ struct ahci_host_priv *ahci_platform_get_resources(struct 
platform_device *pdev,
                hpriv->ahci_regulator = NULL;
        }
 
+       hpriv->phy_regulator = devm_regulator_get_optional(dev, "phy");
+       if (IS_ERR(hpriv->phy_regulator)) {
+               rc = PTR_ERR(hpriv->phy_regulator);
+               if (rc == -EPROBE_DEFER)
+                       goto err_out;
+               rc = 0;
+               hpriv->phy_regulator = NULL;
+       }
+
        if (flags & AHCI_PLATFORM_GET_RESETS) {
                hpriv->rsts = devm_reset_control_array_get_optional_shared(dev);
                if (IS_ERR(hpriv->rsts)) {
-- 
2.16.4