linux-kernel - [PATCH v5 2/4] usb: host: xhci-plat: Get PHYs for xhci's hcds

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Message-Id: <1408632923-19591-3-git-send-email-gautam.vivek@samsung.com>
Date:	Thu, 21 Aug 2014 20:25:21 +0530
From:	Vivek Gautam <gautam.vivek@...sung.com>
To:	linux-usb@...r.kernel.org
Cc:	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, kishon@...com, kgene.kim@...sung.com,
	mathias.nyman@...el.com, stern@...land.harvard.edu,
	sergei.shtylyov@...entembedded.com,
	heikki.krogerus@...ux.intel.com, balbi@...com,
	Vivek Gautam <gautam.vivek@...sung.com>
Subject: [PATCH v5 2/4] usb: host: xhci-plat: Get PHYs for xhci's hcds

The host controller by itself may sometimes need to handle PHY
and/or calibrate some of the PHY settings to get full support out
of the PHY controller. The PHY core provides a calibration
funtionality now to do so.
Therefore, facilitate getting the two possible PHYs, viz.
USB 2.0 type (UTMI+) and USB 3.0 type (PIPE3).

Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
---
 drivers/usb/host/xhci-plat.c |   23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 1a0cf9f..56ef9cf 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -16,6 +16,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/phy/phy.h>
 #include <linux/slab.h>
 #include <linux/usb/xhci_pdriver.h>
 
@@ -180,6 +181,17 @@ static int xhci_plat_probe(struct platform_device *pdev)
 			goto put_hcd;
 	}
 
+	/* Get possile USB 2.0 type PHY (UTMI+) available with xhci */
+	hcd->gen_phy = devm_phy_get(&pdev->dev, "usb2-phy");
+	if (IS_ERR(hcd->gen_phy)) {
+		ret = PTR_ERR(hcd->gen_phy);
+		if (ret == -EPROBE_DEFER)
+			return ret;
+		else if (ret != -ENOSYS && ret != -ENODEV)
+			dev_warn(&pdev->dev,
+				 "Error retrieving usb2 phy: %d\n", ret);
+	}
+
 	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 	if (ret)
 		goto disable_clk;
@@ -209,6 +221,17 @@ static int xhci_plat_probe(struct platform_device *pdev)
 	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
 		xhci->shared_hcd->can_do_streams = 1;
 
+	/* Get possile USB 3.0 type PHY (PIPE3) available with xhci */
+	xhci->shared_hcd->gen_phy = devm_phy_get(&pdev->dev, "usb3-phy");
+	if (IS_ERR(xhci->shared_hcd->gen_phy)) {
+		ret = PTR_ERR(xhci->shared_hcd->gen_phy);
+		if (ret == -EPROBE_DEFER)
+			return ret;
+		else if (ret != -ENOSYS && ret != -ENODEV)
+			dev_warn(&pdev->dev,
+				 "Error retrieving usb3 phy: %d\n", ret);
+	}
+
 	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 	if (ret)
 		goto put_usb3_hcd;
-- 
1.7.10.4

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