Re: [PATCH v4 1/6] dt-bindings: usb: musb: Add support for MediaTek musb controller

[Min Guo <min.guo@mediatek.com>]

Hi Bin,

Sorry to bother you again, I encounter a problem about the extcon
property.

I don't find a common driver describing the usb-connector. Is
there any driver that I can refer to, specially the way to switch MUSB
controller between host and device mode? 
If it needs to implement by myself, is it possible to emulate an
usb-connector driver by extcon-usb-gpio, and also use the notifier
mechanism or can you give me some advices?


Hi Rob,

On Mon, 2019-01-21 at 09:14 -0600, Rob Herring wrote:
> On Mon, Jan 21, 2019 at 08:22:26PM +0800, min.guo@mediatek.com wrote:
> > From: Min Guo <min.guo@mediatek.com>
> > 
> > This adds support for MediaTek musb controller in
> > host, peripheral and otg mode.
> > 
> > Signed-off-by: Min Guo <min.guo@mediatek.com>
> > ---
> > changes in v4:
> > suggested by Sergei:
> > 1. String alignment
> > 
> > changes in v3:
> > 1. no changes
> > 
> > changes in v2:
> > suggested by Bin:
> > 1. Modify DRC to DRD
> > suggested by Rob:
> > 2. Drop the "<soc-model>-musb" in compatible
> 
> This is not what I said. I gave you the exact text to put.

Sorry to misunderstood your meaning last time,  I will modify it in next
patch.
	compatible: should be one of "mediatek,mt2701-musb"...,followed by
"mediatek,mtk-musb"

> > 3. Remove phy-names
> > 4. Add space after comma in clock-names
> > ---
> >  .../devicetree/bindings/usb/mediatek,musb.txt      | 43 ++++++++++++++++++++++
> >  1 file changed, 43 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/usb/mediatek,musb.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/usb/mediatek,musb.txt b/Documentation/devicetree/bindings/usb/mediatek,musb.txt
> > new file mode 100644
> > index 0000000..4305770
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/usb/mediatek,musb.txt
> > @@ -0,0 +1,43 @@
> > +MediaTek musb DRD/OTG controller
> > +-------------------------------------------
> > +
> > +Required properties:
> > + - compatible      : should be "mediatek,mtk-musb"
> > + - reg             : specifies physical base address and size of
> > +                     the registers
> > + - interrupts      : interrupt used by musb controller
> > + - interrupt-names : must be "mc"
> > + - phys            : PHY specifier for the OTG phy
> > + - dr_mode         : should be one of "host", "peripheral" or "otg",
> > +                     refer to usb/generic.txt
> > + - clocks          : a list of phandle + clock-specifier pairs, one for
> > +                     each entry in clock-names
> > + - clock-names     : must contain "main", "mcu", "univpll"
> > +                     for clocks of controller
> > +
> > +Optional properties:
> > + - extcon          : external connector for VBUS and ID pin changes detection,
> > +                     needed when supports dual-role mode
> 
> Again, do not use extcon in new bindings.

Thanks, ok.

> > + - vbus-supply     : reference to the VBUS regulator, needed when supports
> > +                     dual-role mode
> > + - power-domains   : a phandle to USB power domain node to control USB's
> > +                     MTCMOS
> > +
> > +Example:
> > +
> > +usb2: usb@11200000 {
> > +	compatible = "mediatek,mt2701-musb",
> > +		     "mediatek,mtk-musb";
> > +	reg = <0 0x11200000 0 0x1000>;
> > +	interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_LOW>;
> > +	interrupt-names = "mc";
> > +	phys = <&u2port2 PHY_TYPE_USB2>;
> > +	vbus-supply = <&usb_vbus>;
> > +	extcon = <&extcon_usb>;
> > +	dr_mode = "otg";
> > +	clocks = <&pericfg CLK_PERI_USB0>,
> > +		 <&pericfg CLK_PERI_USB0_MCU>,
> > +		 <&pericfg CLK_PERI_USB_SLV>;
> > +	clock-names = "main","mcu","univpll";
> > +	power-domains = <&scpsys MT2701_POWER_DOMAIN_IFR_MSC>;
> > +};
> > -- 
> > 1.9.1
> > 
> > 
> > _______________________________________________
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> > linux-arm-kernel@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Regards,
Min.