linux-kernel - [PATCH v8 13/20] usb: phy: msm: Use reset framework for LINK and PHY resets

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Date:	Mon, 28 Apr 2014 16:34:16 +0300
From:	"Ivan T. Ivanov" <iivanov@...sol.com>
To:	Felipe Balbi <balbi@...com>
Cc:	"Ivan T. Ivanov" <iivanov@...sol.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: [PATCH v8 13/20] usb: phy: msm: Use reset framework for LINK and PHY resets

From: "Ivan T. Ivanov" <iivanov@...sol.com>

Using reset framework eliminate need of platform specific
callbacks and enable reset lines to be specified in DT files.

Signed-off-by: Ivan T. Ivanov <iivanov@...sol.com>
---
 drivers/usb/phy/phy-msm-usb.c | 29 +++++++++++++++++++++--------
 include/linux/usb/msm_hsusb.h |  3 +++
 2 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/phy/phy-msm-usb.c b/drivers/usb/phy/phy-msm-usb.c
index 1bf2d4e..a6abb1b 100644
--- a/drivers/usb/phy/phy-msm-usb.c
+++ b/drivers/usb/phy/phy-msm-usb.c
@@ -32,6 +32,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
 #include <linux/of_device.h>
+#include <linux/reset.h>

 #include <linux/usb.h>
 #include <linux/usb/otg.h>
@@ -235,12 +236,15 @@ static void ulpi_init(struct msm_otg *motg)

 static int msm_otg_link_clk_reset(struct msm_otg *motg, bool assert)
 {
-	int ret = 0;
+	int ret;

-	if (!motg->pdata->link_clk_reset)
-		return ret;
+	if (motg->pdata->link_clk_reset)
+		ret = motg->pdata->link_clk_reset(motg->clk, assert);
+	else if (assert)
+		ret = reset_control_assert(motg->link_rst);
+	else
+		ret = reset_control_deassert(motg->link_rst);

-	ret = motg->pdata->link_clk_reset(motg->clk, assert);
 	if (ret)
 		dev_err(motg->phy.dev, "usb link clk reset %s failed\n",
 			assert ? "assert" : "deassert");
@@ -250,12 +254,13 @@ static int msm_otg_link_clk_reset(struct msm_otg *motg, bool assert)

 static int msm_otg_phy_clk_reset(struct msm_otg *motg)
 {
-	int ret = 0;
+	int ret;

-	if (!motg->pdata->phy_clk_reset)
-		return ret;
+	if (motg->pdata->phy_clk_reset)
+		ret = motg->pdata->phy_clk_reset(motg->phy_reset_clk);
+	else
+		ret = reset_control_reset(motg->phy_rst);

-	ret = motg->pdata->phy_clk_reset(motg->phy_reset_clk);
 	if (ret)
 		dev_err(motg->phy.dev, "usb phy clk reset failed\n");

@@ -1377,6 +1382,14 @@ static int msm_otg_read_dt(struct platform_device *pdev, struct msm_otg *motg)
 	id = of_match_device(msm_otg_dt_match, &pdev->dev);
 	pdata->phy_type = (int) id->data;

+	motg->link_rst = devm_reset_control_get(&pdev->dev, "link");
+	if (IS_ERR(motg->link_rst))
+		return PTR_ERR(motg->link_rst);
+
+	motg->phy_rst = devm_reset_control_get(&pdev->dev, "phy");
+	if (IS_ERR(motg->phy_rst))
+		return PTR_ERR(motg->phy_rst);
+
 	pdata->mode = of_usb_get_dr_mode(node);
 	if (pdata->mode == USB_DR_MODE_UNKNOWN)
 		pdata->mode = USB_DR_MODE_OTG;
diff --git a/include/linux/usb/msm_hsusb.h b/include/linux/usb/msm_hsusb.h
index bd68299..4e5d916 100644
--- a/include/linux/usb/msm_hsusb.h
+++ b/include/linux/usb/msm_hsusb.h
@@ -165,6 +165,9 @@ struct msm_otg {
 	struct regulator *v3p3;
 	struct regulator *v1p8;
 	struct regulator *vddcx;
+
+	struct reset_control *phy_rst;
+	struct reset_control *link_rst;
 };

 #endif
--
1.8.3.2

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