linux-kernel - Re: [PATCH 6/6] dt-bindings: mt8173-mtu3: add reference clock

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Message-ID: <1485049780.10292.78.camel@mhfsdcap03>
Date:   Sun, 22 Jan 2017 09:49:40 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Rob Herring <robh@...nel.org>
CC:     Mathias Nyman <mathias.nyman@...el.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-usb@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH 6/6] dt-bindings: mt8173-mtu3: add reference clock

Hi,

On Sat, 2017-01-21 at 14:11 -0600, Rob Herring wrote:
> On Wed, Jan 18, 2017 at 02:08:27PM +0800, Chunfeng Yun wrote:
> > add a reference clock for compatibility
> 
> Why? This block suddenly has 2 clocks instead of 1?
In fact, there is a reference clock which comes from 26M oscillator
directly. I ignore it because it is a fixed-clock in DTS, and always
turned on for mt8173. But later, I find that I made a mistake before
when I bring up it on a new platform whose reference clock comes from
PLL, and need control it. So here add it, no matter it is a fixed-clock
or not.

> 
> > 
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> >  .../devicetree/bindings/usb/mt8173-mtu3.txt        |   10 +++++-----
> >  1 file changed, 5 insertions(+), 5 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/usb/mt8173-mtu3.txt b/Documentation/devicetree/bindings/usb/mt8173-mtu3.txt
> > index e049d19..8c976cd 100644
> > --- a/Documentation/devicetree/bindings/usb/mt8173-mtu3.txt
> > +++ b/Documentation/devicetree/bindings/usb/mt8173-mtu3.txt
> > @@ -10,7 +10,7 @@ Required properties:
> >   - vusb33-supply : regulator of USB avdd3.3v
> >   - clocks : a list of phandle + clock-specifier pairs, one for each
> >  	entry in clock-names
> > - - clock-names : must contain "sys_ck" for clock of controller;
> > + - clock-names : must contain "sys_ck" and "ref_ck" for clock of controller;
> >  	"wakeup_deb_p0" and "wakeup_deb_p1" are optional, they are
> >  	depends on "mediatek,enable-wakeup"
> >   - phys : a list of phandle + phy specifier pairs
> > @@ -56,10 +56,10 @@ ssusb: usb@...71000 {
> >  	phys = <&phy_port0 PHY_TYPE_USB3>,
> >  	       <&phy_port1 PHY_TYPE_USB2>;
> >  	power-domains = <&scpsys MT8173_POWER_DOMAIN_USB>;
> > -	clocks = <&topckgen CLK_TOP_USB30_SEL>,
> > +	clocks = <&topckgen CLK_TOP_USB30_SEL>, <&clk26m>,
> >  		 <&pericfg CLK_PERI_USB0>,
> >  		 <&pericfg CLK_PERI_USB1>;
> > -	clock-names = "sys_ck",
> > +	clock-names = "sys_ck", "ref_ck",
> >  		      "wakeup_deb_p0",
> >  		      "wakeup_deb_p1";
> >  	vusb33-supply = <&mt6397_vusb_reg>;
> > @@ -79,8 +79,8 @@ ssusb: usb@...71000 {
> >  		reg-names = "mac";
> >  		interrupts = <GIC_SPI 115 IRQ_TYPE_LEVEL_LOW>;
> >  		power-domains = <&scpsys MT8173_POWER_DOMAIN_USB>;
> > -		clocks = <&topckgen CLK_TOP_USB30_SEL>;
> > -		clock-names = "sys_ck";
> > +		clocks = <&topckgen CLK_TOP_USB30_SEL>, <&clk26m>;
> > +		clock-names = "sys_ck", "ref_ck";
> >  		vusb33-supply = <&mt6397_vusb_reg>;
> >  		status = "disabled";
> >  	};
> > -- 
> > 1.7.9.5
> >