Thread (14 messages) 14 messages, 2 authors, 2014-09-02

Re: [PATCH v4 2/3] usb: dwc3: dwc3-st: Add st-dwc3 devicetree bindings documentation

From: Peter Griffin <peter.griffin@linaro.org>
Date: 2014-08-21 13:33:48
Also in: linux-arm-kernel, linux-omap, lkml

Hi Felipe,

Thanks for reviewing, see my comments below: -

On Wed, 20 Aug 2014, Felipe Balbi wrote:
quoted
+	dwc3: dwc3@9900000 {
+		compatible	= "snps,dwc3";
+		reg		= <0x09900000 0x100000>;
+		interrupts	= <GIC_SPI 155 IRQ_TYPE_NONE>;
+		dr_mode		= "host"
+		usb-phy		= <&usb3_phy>;
+		phy-names	= "usb2-phy";
+		phys		= <&usb2_picophy2>;
why are you using different binding for usb2 and usb3 phys ? Why can't
you just:

	phys-names	= "usb2-phy", "usb3-phy";
	phys		= <&usb2_picophy2>, <&usb3_phy>;

??
Currently (in the vendor tree) one of the phys lives in drivers/usb/phy and the other in drivers/phy.
I believe that is because one is only a usb phy and the other is a multi function phy which can drive
PCI-E or USB3.

So to make that work, when dwc3/core.c gets the PHYS in dwc3_core_get_phy() we need to use the different
bindings.

I think we are the only platform using "one of each", but luckily dwc3_core_get_phy()
has been written generically enough that it "just works" :-).

regards,

Peter.
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