linux-kernel - [PATCH v7 4/7] usb: allow to supply the PHY in the drivers when using HCD

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Message-Id: <1414514141-31767-5-git-send-email-antoine.tenart@free-electrons.com>
Date:	Tue, 28 Oct 2014 17:35:38 +0100
From:	Antoine Tenart <antoine.tenart@...e-electrons.com>
To:	balbi@...com, gregkh@...uxfoundation.org, Peter.Chen@...escale.com,
	kishon@...com, stern@...land.harvard.edu
Cc:	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	alexandre.belloni@...e-electrons.com,
	thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
	jszhang@...vell.com, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v7 4/7] usb: allow to supply the PHY in the drivers when using HCD

This patch modify the generic code handling PHYs to allow them to be
supplied from the drivers. This adds checks to ensure no PHY was already
there when looking for one in the generic code. This also makes sure we
do not modify its state in the generic HCD functions, it was provided by
the driver.

Signed-off-by: Antoine Tenart <antoine.tenart@...e-electrons.com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
---
 drivers/usb/core/hcd.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index b84fb141e122..6a2a2fd990ab 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2648,7 +2648,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
 		}
 	}
 
-	if (IS_ENABLED(CONFIG_GENERIC_PHY)) {
+	if (IS_ENABLED(CONFIG_GENERIC_PHY) && !hcd->phy) {
 		struct phy *phy = phy_get(hcd->self.controller, "usb");
 
 		if (IS_ERR(phy)) {
@@ -2668,6 +2668,7 @@ int usb_add_hcd(struct usb_hcd *hcd,
 				goto err_phy;
 			}
 			hcd->phy = phy;
+			hcd->remove_phy = 1;
 		}
 	}
 
@@ -2814,7 +2815,7 @@ err_allocate_root_hub:
 err_register_bus:
 	hcd_buffer_destroy(hcd);
 err_create_buf:
-	if (IS_ENABLED(CONFIG_GENERIC_PHY) && hcd->phy) {
+	if (IS_ENABLED(CONFIG_GENERIC_PHY) && hcd->remove_phy && hcd->phy) {
 		phy_power_off(hcd->phy);
 		phy_exit(hcd->phy);
 		phy_put(hcd->phy);
@@ -2898,7 +2899,7 @@ void usb_remove_hcd(struct usb_hcd *hcd)
 	usb_deregister_bus(&hcd->self);
 	hcd_buffer_destroy(hcd);
 
-	if (IS_ENABLED(CONFIG_GENERIC_PHY) && hcd->phy) {
+	if (IS_ENABLED(CONFIG_GENERIC_PHY) && hcd->remove_phy && hcd->phy) {
 		phy_power_off(hcd->phy);
 		phy_exit(hcd->phy);
 		phy_put(hcd->phy);
-- 
1.9.1

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