linux-kernel - [PATCH v6 2/4] usb: host: xhci-plat: Get PHYs for xhci's hcds

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Date:	Tue,  2 Sep 2014 16:42:16 +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,
	linux-arm-kernel@...ts.infradead.org, gregkh@...uxfoundation.org,
	kishon@...com, balbi@...com, stern@...land.harvard.edu,
	kgene.kim@...sung.com, heikki.krogerus@...ux.intel.com,
	mathias.nyman@...el.com, sergei.shtylyov@...entembedded.com,
	jg1.han@...sung.com, Vivek Gautam <gautam.vivek@...sung.com>
Subject: [PATCH v6 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 |   27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 1a0cf9f..6afd508 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 +181,19 @@ 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) {
+			hcd->gen_phy = NULL;
+			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 +223,19 @@ 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) {
+			xhci->shared_hcd->gen_phy = NULL;
+			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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