linux-kernel - [PATCH v2] usb: ehci-platform: add reset controller number in struct ehci_platform

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Message-ID: <1462258069-1435-1-git-send-email-xuejiancheng@hisilicon.com>
Date:	Tue, 3 May 2016 14:47:49 +0800
From:	Jiancheng Xue <xuejiancheng@...ilicon.com>
To:	<stern@...land.harvard.edu>
CC:	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<yanhaifeng@...ilicon.com>, <yanghongwei@...ilicon.com>,
	<zhangzhenxing@...ilicon.com>, <suwenping@...ilicon.com>,
	<raojun@...ilicon.com>, <ml.yang@...ilicon.com>,
	<gaofei@...ilicon.com>, <hermit.wangheming@...ilicon.com>,
	<jiangheng@...ilicon.com>, <lpc.li@...ilicon.com>,
	Jiancheng Xue <xuejiancheng@...ilicon.com>
Subject: [PATCH v2] usb: ehci-platform: add reset controller number in struct ehci_platform_priv

Some ehci compatible controllers have more than one reset signal lines,
e.g., Synopsys DWC USB2.0 Host-AHB Controller has two resets hreset_i_n
and phy_rst_i_n. Two more resets are added in this patch in order for
this kind of controller to use this driver directly.

Signed-off-by: Jiancheng Xue <xuejiancheng@...ilicon.com>
---
Change Log:
v2:
-Fixed a bug pointed by Alan Stern.
 Called reset_control_put() for the offending reset line.
-Fixed a compiling error.

 drivers/usb/host/ehci-platform.c | 45 +++++++++++++++++++++++++---------------
 1 file changed, 28 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index 1757ebb..bc33f45 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -39,11 +39,12 @@
 
 #define DRIVER_DESC "EHCI generic platform driver"
 #define EHCI_MAX_CLKS 3
+#define EHCI_MAX_RSTS 3
 #define hcd_to_ehci_priv(h) ((struct ehci_platform_priv *)hcd_to_ehci(h)->priv)
 
 struct ehci_platform_priv {
 	struct clk *clks[EHCI_MAX_CLKS];
-	struct reset_control *rst;
+	struct reset_control *rsts[EHCI_MAX_RSTS];
 	struct phy **phys;
 	int num_phys;
 	bool reset_on_resume;
@@ -149,7 +150,7 @@ static int ehci_platform_probe(struct platform_device *dev)
 	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ehci_platform_priv *priv;
 	struct ehci_hcd *ehci;
-	int err, irq, phy_num, clk = 0;
+	int err, irq, phy_num, clk = 0, rst;
 
 	if (usb_disabled())
 		return -ENODEV;
@@ -234,16 +235,22 @@ static int ehci_platform_probe(struct platform_device *dev)
 		}
 	}
 
-	priv->rst = devm_reset_control_get_optional(&dev->dev, NULL);
-	if (IS_ERR(priv->rst)) {
-		err = PTR_ERR(priv->rst);
-		if (err == -EPROBE_DEFER)
-			goto err_put_clks;
-		priv->rst = NULL;
-	} else {
-		err = reset_control_deassert(priv->rst);
-		if (err)
-			goto err_put_clks;
+	for (rst = 0; rst < EHCI_MAX_RSTS; rst++) {
+		priv->rsts[rst] = of_reset_control_get_by_index(
+					dev->dev.of_node, rst);
+		if (IS_ERR(priv->rsts[rst])) {
+			err = PTR_ERR(priv->rsts[rst]);
+			if (err == -EPROBE_DEFER)
+				goto err_reset;
+			priv->rsts[rst] = NULL;
+			break;
+		}
+
+		err = reset_control_deassert(priv->rsts[rst]);
+		if (err) {
+			reset_control_put(priv->rsts[rst]);
+			goto err_reset;
+		}
 	}
 
 	if (pdata->big_endian_desc)
@@ -300,8 +307,10 @@ err_power:
 	if (pdata->power_off)
 		pdata->power_off(dev);
 err_reset:
-	if (priv->rst)
-		reset_control_assert(priv->rst);
+	while (--rst >= 0) {
+		reset_control_assert(priv->rsts[rst]);
+		reset_control_put(priv->rsts[rst]);
+	}
 err_put_clks:
 	while (--clk >= 0)
 		clk_put(priv->clks[clk]);
@@ -319,15 +328,17 @@ static int ehci_platform_remove(struct platform_device *dev)
 	struct usb_hcd *hcd = platform_get_drvdata(dev);
 	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ehci_platform_priv *priv = hcd_to_ehci_priv(hcd);
-	int clk;
+	int clk, rst;
 
 	usb_remove_hcd(hcd);
 
 	if (pdata->power_off)
 		pdata->power_off(dev);
 
-	if (priv->rst)
-		reset_control_assert(priv->rst);
+	for (rst = 0; rst < EHCI_MAX_RSTS && priv->rsts[rst]; rst++) {
+		reset_control_assert(priv->rsts[rst]);
+		reset_control_put(priv->rsts[rst]);
+	}
 
 	for (clk = 0; clk < EHCI_MAX_CLKS && priv->clks[clk]; clk++)
 		clk_put(priv->clks[clk]);
-- 
1.9.1