linux-kernel - [PATCH 05/14] usb: phy: nop: Handle RESET for the PHY

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: <1357836694-30788-6-git-send-email-rogerq@ti.com>
Date:	Thu, 10 Jan 2013 18:51:25 +0200
From:	Roger Quadros <rogerq@...com>
To:	<balbi@...com>
CC:	<gregkh@...uxfoundation.org>, <sameo@...ux.intel.com>,
	<tony@...mide.com>, <kishon@...com>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <rogerq@...com>
Subject: [PATCH 05/14] usb: phy: nop: Handle RESET for the PHY

We expect the RESET line to be modeled as a regulator with supply
name "reset". The regulator should be modeled such that enabling
the regulator brings the PHY device out of RESET and disabling the
regulator holds the device in RESET.

They PHY will be held in RESET in .shutdown() and brought out of
RESET in .init().

Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/usb/otg/nop-usb-xceiv.c |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/otg/nop-usb-xceiv.c b/drivers/usb/otg/nop-usb-xceiv.c
index 1c6db10..8fd49a8 100644
--- a/drivers/usb/otg/nop-usb-xceiv.c
+++ b/drivers/usb/otg/nop-usb-xceiv.c
@@ -40,6 +40,7 @@ struct nop_usb_xceiv {
 	struct device		*dev;
 	struct clk		*clk;
 	struct regulator	*vcc;
+	struct regulator	*reset;
 };
 
 static struct platform_device *pd;
@@ -80,6 +81,12 @@ static int nop_init(struct usb_phy *phy)
 	if (nop->clk)
 		clk_enable(nop->clk);
 
+	if (nop->reset) {
+		/* De-assert RESET */
+		if (regulator_enable(nop->reset))
+			dev_err(phy->dev, "Failed to de-assert reset\n");
+	}
+
 	return 0;
 }
 
@@ -87,6 +94,12 @@ static void nop_shutdown(struct usb_phy *phy)
 {
 	struct nop_usb_xceiv *nop = dev_get_drvdata(phy->dev);
 
+	if (nop->reset) {
+		/* Assert RESET */
+		if (regulator_disable(nop->reset))
+			dev_err(phy->dev, "Failed to assert reset\n");
+	}
+
 	if (nop->clk)
 		clk_disable(nop->clk);
 
@@ -175,6 +188,12 @@ static int nop_usb_xceiv_probe(struct platform_device *pdev)
 		nop->vcc = NULL;
 	}
 
+	nop->reset = devm_regulator_get(&pdev->dev, "reset");
+	if (IS_ERR(nop->reset)) {
+		dev_dbg(&pdev->dev, "Error getting reset regulator\n");
+		nop->reset = NULL;
+	}
+
 	nop->dev		= &pdev->dev;
 	nop->phy.dev		= nop->dev;
 	nop->phy.label		= "nop-xceiv";
-- 
1.7.4.1

--
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/