linux-kernel - [PATCH 3/6] phy: core: Support regulator supply for PHY power

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1404302638-3003-4-git-send-email-rogerq@ti.com>
Date:	Wed, 2 Jul 2014 15:03:55 +0300
From:	Roger Quadros <rogerq@...com>
To:	<tony@...mide.com>, <kishon@...com>, <balbi@...com>
CC:	<nsekhar@...com>, <nm@...com>, <george.cherian@...com>,
	<linux-omap@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Roger Quadros <rogerq@...com>
Subject: [PATCH 3/6] phy: core: Support regulator supply for PHY power

Some PHYs can be powered by an external power regulator.
e.g. USB_HS PHY on DRA7 SoC. Make the PHY core support a
power regulator.

Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/phy/phy-core.c  | 32 ++++++++++++++++++++++++++++++++
 include/linux/phy/phy.h |  2 ++
 2 files changed, 34 insertions(+)

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 49c4465..d817107 100644
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -21,6 +21,7 @@
 #include <linux/phy/phy.h>
 #include <linux/idr.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 
 static struct class *phy_class;
 static DEFINE_MUTEX(phy_provider_mutex);
@@ -226,6 +227,12 @@ int phy_power_on(struct phy *phy)
 	if (!phy)
 		return 0;
 
+	if (phy->pwr) {
+		ret = regulator_enable(phy->pwr);
+		if (ret)
+			return ret;
+	}
+
 	ret = phy_pm_runtime_get_sync(phy);
 	if (ret < 0 && ret != -ENOTSUPP)
 		return ret;
@@ -247,6 +254,8 @@ int phy_power_on(struct phy *phy)
 out:
 	mutex_unlock(&phy->mutex);
 	phy_pm_runtime_put_sync(phy);
+	if (phy->pwr)
+		regulator_disable(phy->pwr);
 
 	return ret;
 }
@@ -272,6 +281,9 @@ int phy_power_off(struct phy *phy)
 	mutex_unlock(&phy->mutex);
 	phy_pm_runtime_put(phy);
 
+	if (phy->pwr)
+		regulator_disable(phy->pwr);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(phy_power_off);
@@ -588,6 +600,16 @@ struct phy *phy_create(struct device *dev, const struct phy_ops *ops,
 		goto free_phy;
 	}
 
+	/* phy-supply */
+	phy->pwr = regulator_get_optional(dev, "phy");
+	if (IS_ERR(phy->pwr)) {
+		if (PTR_ERR(phy->pwr) == -EPROBE_DEFER) {
+			ret = -EPROBE_DEFER;
+			goto free_ida;
+		}
+		phy->pwr = NULL;
+	}
+
 	device_initialize(&phy->dev);
 	mutex_init(&phy->mutex);
 
@@ -617,6 +639,9 @@ put_dev:
 	put_device(&phy->dev);  /* calls phy_release() which frees resources */
 	return ERR_PTR(ret);
 
+free_ida:
+	ida_simple_remove(&phy_ida, phy->id);
+
 free_phy:
 	kfree(phy);
 	return ERR_PTR(ret);
@@ -664,6 +689,10 @@ EXPORT_SYMBOL_GPL(devm_phy_create);
 void phy_destroy(struct phy *phy)
 {
 	pm_runtime_disable(&phy->dev);
+
+	if (phy->pwr)
+		regulator_put(phy->pwr);
+
 	device_unregister(&phy->dev);
 }
 EXPORT_SYMBOL_GPL(phy_destroy);
@@ -800,6 +829,9 @@ static void phy_release(struct device *dev)
 
 	phy = to_phy(dev);
 	dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
+	if (phy->pwr)
+		regulator_put(phy->pwr);
+
 	ida_simple_remove(&phy_ida, phy->id);
 	kfree(phy);
 }
diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index 2760744..9a86945 100644
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -18,6 +18,7 @@
 #include <linux/of.h>
 #include <linux/device.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 
 struct phy;
 
@@ -65,6 +66,7 @@ struct phy {
 	int			init_count;
 	int			power_count;
 	struct phy_attrs	attrs;
+	struct regulator	*pwr;
 };
 
 /**
-- 
1.8.3.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/