linux-kernel - [RFC][PATCH 2/3] HACK: dwc2: force dual use of uphy and phy

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Date:   Tue, 22 Nov 2016 19:46:48 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Wei Xu <xuwei5@...ilicon.com>,
        Guodong Xu <guodong.xu@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        John Youn <johnyoun@...opsys.com>,
        Douglas Anderson <dianders@...omium.org>,
        Chen Yu <chenyu56@...wei.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org
Subject: [RFC][PATCH 2/3] HACK: dwc2: force dual use of uphy and phy

I can't seem to figure out how to connect a generic phy device
to the usb UDC logic, as the dwc2 code seems to exclusively work
with either generic phys or usb-phys.

So to try to make this work with the phy-hi6220-usb driver, tweak
the dwc2 logic to support call hooks to both phy and uphy devices.

I realize this is likely wrong, but without a good pointer as to
how this should be done, I'm a bit wandering around in the dark.

Cc: Wei Xu <xuwei5@...ilicon.com>
Cc: Guodong Xu <guodong.xu@...aro.org>
Cc: Amit Pundir <amit.pundir@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: John Youn <johnyoun@...opsys.com>
Cc: Douglas Anderson <dianders@...omium.org>
Cc: Chen Yu <chenyu56@...wei.com>
Cc: Kishon Vijay Abraham I <kishon@...com>
Cc: Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 drivers/usb/dwc2/platform.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 8e1728b..8fb2f4d 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -297,7 +297,7 @@ static int __dwc2_lowlevel_hw_enable(struct dwc2_hsotg *hsotg)
 
 	if (hsotg->uphy)
 		ret = usb_phy_init(hsotg->uphy);
-	else if (hsotg->plat && hsotg->plat->phy_init)
+	if (hsotg->plat && hsotg->plat->phy_init)
 		ret = hsotg->plat->phy_init(pdev, hsotg->plat->phy_type);
 	else {
 		ret = phy_power_on(hsotg->phy);
@@ -411,7 +411,7 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
 		}
 	}
 
-	if (!hsotg->phy) {
+	if (1 || !hsotg->phy) {
 		hsotg->uphy = devm_usb_get_phy(hsotg->dev, USB_PHY_TYPE_USB2);
 		if (IS_ERR(hsotg->uphy)) {
 			ret = PTR_ERR(hsotg->uphy);
-- 
2.7.4