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From: Rob Herring <>
To: Sascha Hauer <>
	Minas Harutyunyan <>,,
Subject: Re: [PATCH v2 0/2] usb: dwc2: Use clk bulk API for supporting multiple clocks
Date: Tue, 9 Feb 2021 10:54:24 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Mon, Jan 25, 2021 at 10:38:23AM +0100, Sascha Hauer wrote:
> Currently the dwc2 driver only supports a single clock. I have a board
> here which has a dwc2 controller with a somewhat special clock routing
> to the phy. Both the dwc2 controller and the ULPI phy get their phy
> clock from a SI5351 clock generator. This clock generator has multiple
> clock outputs which each is modelled as a separate clk in Linux.
> Unfortunately the clock to the phy and the clock to the dwc2 core are on
> two different output pins of the SI5351, so we have two clocks which
> must be enabled.  The phy is driven by the usb-nop-xceiver driver which
> supports a single clock. My first approach was to add support for a
> second clock to that driver, but technically the other clock is
> connected to the dwc2 core, so instead I added support for a second
> clock to the dwc2 driver.  This can easily be archieved with the clk
> bulk API as done in this series.

Where is the usb-nop-xceiver single clock coming from? 

Maybe you shouldn't be using usb-nop-xceiver? There is a ULPI binding 
though that alone doesn't really help you.


  parent reply	other threads:[~2021-02-09 16:55 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-25  9:38 [PATCH v2 0/2] usb: dwc2: Use clk bulk API for supporting multiple clocks Sascha Hauer
2021-01-25  9:38 ` [PATCH 1/2] dt-bindings: usb: dwc2: Add support for additional clock Sascha Hauer
2021-02-09 16:46   ` Rob Herring
2021-02-10  8:39     ` Sascha Hauer
2021-01-25  9:38 ` [PATCH 2/2] usb: dwc2: use clk bulk API for supporting additional clocks Sascha Hauer
2021-02-09 16:54 ` Rob Herring [this message]
2021-02-10  8:42   ` [PATCH v2 0/2] usb: dwc2: Use clk bulk API for supporting multiple clocks Sascha Hauer

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