linux-kernel - [PATCH 4/5] phy: tegra: xusb: Add support for power supplies

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Date:   Fri, 25 Jan 2019 12:25:24 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>, JC Kuo <jckuo@...dia.com>,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] phy: tegra: xusb: Add support for power supplies

From: Thierry Reding <treding@...dia.com>

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

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/phy/tegra/xusb.c | 34 +++++++++++++++++++++++++++++++++-
 drivers/phy/tegra/xusb.h |  5 +++++
 2 files changed, 38 insertions(+), 1 deletion(-)

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,
-- 
2.19.1