From mboxrd@z Thu Jan  1 00:00:00 1970
From: LW@KARO-electronics.de (Lothar =?UTF-8?B?V2HDn21hbm4=?=)
Date: Tue, 22 Jul 2014 10:06:13 +0200
Subject: [PATCH 8/9] usb: phy: am335x: call
 usb_gen_phy_init()/usb_gen_phy_shutdown() in
 am335x_init()/am335x_shutdown()
In-Reply-To: <20140721151043.GF6852@saruman.home>
References: <1405675890-8802-2-git-send-email-LW@KARO-electronics.de>
 <1405675890-8802-3-git-send-email-LW@KARO-electronics.de>
 <1405675890-8802-4-git-send-email-LW@KARO-electronics.de>
 <1405675890-8802-5-git-send-email-LW@KARO-electronics.de>
 <1405675890-8802-6-git-send-email-LW@KARO-electronics.de>
 <1405675890-8802-7-git-send-email-LW@KARO-electronics.de>
 <1405675890-8802-8-git-send-email-LW@KARO-electronics.de>
 <1405675890-8802-9-git-send-email-LW@KARO-electronics.de>
 <20140718135713.GH24914@saruman.home>
 <20140721100307.21172b65@ipc1.ka-ro>
 <20140721151043.GF6852@saruman.home>
Message-ID: <20140722100613.779a3e11@ipc1.ka-ro>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hi,

Felipe Balbi wrote:
> Hi,,
> 
> On Mon, Jul 21, 2014 at 10:03:07AM +0200, Lothar Wa?mann wrote:
> > Hi,
> > 
> > > On Fri, Jul 18, 2014 at 11:31:29AM +0200, Lothar Wa?mann wrote:
> > > > This patch makes it possible to use the musb driver with HW that
> > > > requires external regulators or clocks.
> > > 
> > > can you provide an example of such HW ? Are you not using the internal
> > > PHYs ?
> > > 
> > The Ka-Ro electronics TX48 module uses the mmc0_clk pin as VBUSEN
> > rathern than usb0_drvvbus. This patch makes it possible to use an
> > external regulator to handle the VBUS switch through the 'vcc-supply'
> > property of the underlying generic_phy device.
> 
> OK, I get it now. But why would not use usb0_drvvbus ? You could still
> route usb0_drvvbus to the regulator enable pin and the regulator would
> be enabled for you once correct values are written to the IP's mailbox.
> 
> I suppose this has something to do with layout constraints ?
> 
Yes. The usb0_drvvbus is used for a different purpose.


Lothar Wa?mann
-- 
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