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Message-ID: <20140722100613.779a3e11@ipc1.ka-ro> Date: Tue, 22 Jul 2014 10:06:13 +0200 From: Lothar Waßmann <LW@...O-electronics.de> To: <balbi@...com> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>, Ezequiel Garcia <ezequiel@...guardiasur.com.ar>, George Cherian <george.cherian@...com>, <linux-arm-kernel@...ts.infradead.org>, Roger Quadros <rogerq@...com> Subject: Re: [PATCH 8/9] usb: phy: am335x: call usb_gen_phy_init()/usb_gen_phy_shutdown() in am335x_init()/am335x_shutdown() Hi, Felipe Balbi wrote: > Hi,, > > On Mon, Jul 21, 2014 at 10:03:07AM +0200, Lothar Waßmann wrote: > > Hi, > > > > > On Fri, Jul 18, 2014 at 11:31:29AM +0200, Lothar Waßmann 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 Waßmann -- ___________________________________________________________ Ka-Ro electronics GmbH | Pascalstraße 22 | D - 52076 Aachen Phone: +49 2408 1402-0 | Fax: +49 2408 1402-10 Geschäftsführer: Matthias Kaussen Handelsregistereintrag: Amtsgericht Aachen, HRB 4996 www.karo-electronics.de | info@...o-electronics.de ___________________________________________________________ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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