phy: tegra: xusb: Add support for power supplies

Support enabling various supplies needed to provide power to the PLLs
and logic used to drive the USB, PCI and SATA pads.

Reviewed-by: JC Kuo <jckuo@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

2 files changed, 38 insertions, 1 deletions

diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index 57a2d08ef6da..e510629f4f1c 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -864,6 +864,7 @@ static int tegra_xusb_padctl_probe(struct platform_device *pdev)
         struct tegra_xusb_padctl *padctl;
         const struct of_device_id *match;
         struct resource *res;
+        unsigned int i;
         int err;
 
         /* for backwards compatibility with old device trees */
@@ -901,14 +902,38 @@ static int tegra_xusb_padctl_probe(struct platform_device *pdev)
                 goto remove;
         }
 
+        padctl->supplies = devm_kcalloc(&pdev->dev, padctl->soc->num_supplies,
+                                        sizeof(*padctl->supplies), GFP_KERNEL);
+        if (!padctl->supplies) {
+                err = -ENOMEM;
+                goto remove;
+        }
+
+        for (i = 0; i < padctl->soc->num_supplies; i++)
+                padctl->supplies[i].supply = padctl->soc->supply_names[i];
+
+        err = devm_regulator_bulk_get(&pdev->dev, padctl->soc->num_supplies,
+                                      padctl->supplies);
+        if (err < 0) {
+                dev_err(&pdev->dev, "failed to get regulators: %d\n", err);
+                goto remove;
+        }
+
         err = reset_control_deassert(padctl->rst);
         if (err < 0)
                 goto remove;
 
+        err = regulator_bulk_enable(padctl->soc->num_supplies,
+                                    padctl->supplies);
+        if (err < 0) {
+                dev_err(&pdev->dev, "failed to enable supplies: %d\n", err);
+                goto reset;
+        }
+
         err = tegra_xusb_setup_pads(padctl);
         if (err < 0) {
                 dev_err(&pdev->dev, "failed to setup pads: %d\n", err);
-                goto reset;
+                goto power_down;
         }
 
         err = tegra_xusb_setup_ports(padctl);
@@ -921,6 +946,8 @@ static int tegra_xusb_padctl_probe(struct platform_device *pdev)
 
 remove_pads:
         tegra_xusb_remove_pads(padctl);
+power_down:
+        regulator_bulk_disable(padctl->soc->num_supplies, padctl->supplies);
 reset:
         reset_control_assert(padctl->rst);
 remove:
@@ -936,6 +963,11 @@ static int tegra_xusb_padctl_remove(struct platform_device *pdev)
         tegra_xusb_remove_ports(padctl);
         tegra_xusb_remove_pads(padctl);
 
+        err = regulator_bulk_disable(padctl->soc->num_supplies,
+                                     padctl->supplies);
+        if (err < 0)
+                dev_err(&pdev->dev, "failed to disable supplies: %d\n", err);
+
         err = reset_control_assert(padctl->rst);
         if (err < 0)
                 dev_err(&pdev->dev, "failed to assert reset: %d\n", err);
diff --git a/drivers/phy/tegra/xusb.h b/drivers/phy/tegra/xusb.h
index bb60fc09c752..5d5d22f6cb41 100644
--- a/drivers/phy/tegra/xusb.h
+++ b/drivers/phy/tegra/xusb.h
@@ -370,6 +370,9 @@ struct tegra_xusb_padctl_soc {
         } ports;
 
         const struct tegra_xusb_padctl_ops *ops;
+
+        const char * const *supply_names;
+        unsigned int num_supplies;
 };
 
 struct tegra_xusb_padctl {
@@ -393,6 +396,8 @@ struct tegra_xusb_padctl {
         unsigned int enable;
 
         struct clk *clk;
+
+        struct regulator_bulk_data *supplies;
 };
 
 static inline void padctl_writel(struct tegra_xusb_padctl *padctl, u32 value,