linux-kernel - [PATCH] usb: ehci-msm: Don't ioremap configuration space exclusively

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Message-Id: <1428568436-9134-1-git-send-email-ivan.ivanov@linaro.org>
Date:	Thu,  9 Apr 2015 11:33:56 +0300
From:	"Ivan T. Ivanov" <ivan.ivanov@...aro.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: [PATCH] usb: ehci-msm: Don't ioremap configuration space exclusively

This allow same IO space to be shared between HCD and Device
controller driver. Which can be loaded simultaneously and
started/stopped on demand by USB OTG PHY driver.

Signed-off-by: Ivan T. Ivanov <ivan.ivanov@...aro.org>
---
 drivers/usb/host/ehci-msm.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
index 9db74ca..f059e15 100644
--- a/drivers/usb/host/ehci-msm.c
+++ b/drivers/usb/host/ehci-msm.c
@@ -88,13 +88,17 @@ static int ehci_msm_probe(struct platform_device *pdev)
 	}

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (!res)
+		return -ENODEV;
+
+	hcd->rsrc_start = res->start;
+	hcd->rsrc_len = resource_size(res);
+
+	hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
 	if (IS_ERR(hcd->regs)) {
 		ret = PTR_ERR(hcd->regs);
 		goto put_hcd;
 	}
-	hcd->rsrc_start = res->start;
-	hcd->rsrc_len = resource_size(res);

 	/*
 	 * OTG driver takes care of PHY initialization, clock management,
--
1.9.1

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