From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: [1/2] Documentation: usb: dwc3: add power down clock scale property From: Rob Herring Message-Id: <20190223003246.GA20964@bogus> Date: Fri, 22 Feb 2019 18:32:46 -0600 To: Jun Li Cc: "mark.rutland@arm.com" , "balbi@kernel.org" , "linux-usb@vger.kernel.org" , "devicetree@vger.kernel.org" , dl-linux-imx List-ID: T24gVHVlLCBKYW4gMjIsIDIwMTkgYXQgMTA6Mzc6MTdBTSArMDAwMCwgSnVuIExpIHdyb3RlOgo+ IFRoZSBVU0IzIHN1c3BlbmRfY2xrIGlucHV0IHJlcGxhY2VzIHBpcGUzX3J4X3BjbGsgYXMgYSBj bG9jawo+IHNvdXJjZSB0byBhIHNtYWxsIHBhcnQgb2YgdGhlIFVTQjMgY29yZSB0aGF0IG9wZXJh dGVzIHdoZW4gdGhlCj4gU1MgUEhZIGlzIGluIGl0cyBsb3dlc3QgcG93ZXIoUDMpIHN0YXRlLCBh bmQgdGhlcmVmb3JlIGRvZXMKPiBub3QgcHJvdmlkZSBhIGNsb2NrLiBUaGUgcG93ZXIgZG93biBz Y2FsZSBzcGVjaWZpZXMgaG93IG1hbnkKPiBzdXNwZW5kX2NsayBwZXJpb2RzIGZpdCBpbnRvIGEg MTYgS0h6IGNsb2NrIHBlcmlvZCwgZGV0YWlscwo+IGNhbiBzZWUgRFdDMyBkYXRhYm9vayByZWdp c3RlciBHQ1RMLlBXUkROU0NBTEUuCj4gCj4gU2lnbmVkLW9mZi1ieTogTGkgSnVuIDxqdW4ubGlA bnhwLmNvbT4KPiAtLS0KPiAgRG9jdW1lbnRhdGlvbi9kZXZpY2V0cmVlL2JpbmRpbmdzL3VzYi9k d2MzLnR4dCB8IDYgKysrKysrCj4gIDEgZmlsZSBjaGFuZ2VkLCA2IGluc2VydGlvbnMoKykKPiAK PiBkaWZmIC0tZ2l0IGEvRG9jdW1lbnRhdGlvbi9kZXZpY2V0cmVlL2JpbmRpbmdzL3VzYi9kd2Mz LnR4dCBiL0RvY3VtZW50YXRpb24vZGV2aWNldHJlZS9iaW5kaW5ncy91c2IvZHdjMy50eHQKPiBp bmRleCAzZTRjMzhiLi5kMWM4YjYyIDEwMDY0NAo+IC0tLSBhL0RvY3VtZW50YXRpb24vZGV2aWNl dHJlZS9iaW5kaW5ncy91c2IvZHdjMy50eHQKPiArKysgYi9Eb2N1bWVudGF0aW9uL2RldmljZXRy ZWUvYmluZGluZ3MvdXNiL2R3YzMudHh0Cj4gQEAgLTEwMiw2ICsxMDIsMTIgQEAgT3B0aW9uYWwg cHJvcGVydGllczoKPiAgCQkJbW9yZSB0aGFuIG9uZSB2YWx1ZSwgd2hpY2ggbWVhbnMgdW5kZWZp bmVkIGxlbmd0aCBJTkNSIGJ1cnN0IHR5cGUKPiAgCQkJZW5hYmxlZC4gVGhlIHZhbHVlcyBjYW4g YmUgMSwgNCwgOCwgMTYsIDMyLCA2NCwgMTI4IGFuZCAyNTYuCj4gIAo+ICsgLSBzbnBzLHBvd2Vy LWRvd24tc2NhbGU6IFBvd2VyIGRvd24gc2NhbGUgZmllbGQgc3BlY2lmaWVzIGhvdyBtYW55IHN1 c3BlbmRfY2xrCj4gKwkJCXBlcmlvZHMgZml0IGludG8gYSAxNiBLaHogY2xvY2sgcGVyaW9kLiBX aGVuIHBlcmZvcm1pbmcKPiArCQkJdGhlIGRpdmlzaW9uLCByb3VuZCB1cCB0aGUgcmVtYWluZGVy LiBTdXNwZW5kIGNsb2NrIGlzCj4gKwkJCWZyb20gMzJrSHogdG8gMTI1TUh6LCBtZWFucyB0aGUg dmFsdWUgcmFuZ2UgaXMgMn44MDAwLgo+ICsJCQkoZGV0YWlscyBzZWUgRFdDX3VzYjMgZGF0YWJv b2sgcmVnaXN0ZXIgR0NUTC5QV1JETlNDQUxFKS4KPiArCgpTb3VuZHMgbGlrZSB0aGUgc3VzcGVu ZF9jbGsgc2hvdWxkIGJlIHByb3ZpZGVkIGFzIGEgY2xvY2sgaW5wdXQgc28geW91IApjYW4gY2Fs Y3VsYXRlIHRoaXMgdmFsdWUuCgo+ICAgLSBpbiBhZGRpdGlvbiBhbGwgcHJvcGVydGllcyBmcm9t IHVzYi14aGNpLnR4dCBmcm9tIHRoZSBjdXJyZW50IGRpcmVjdG9yeSBhcmUKPiAgICAgc3VwcG9y dGVkIGFzIHdlbGwKPiAgCj4gLS0gCj4gMi43LjQKPgo= From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Fri, 22 Feb 2019 18:32:46 -0600 From: Rob Herring Subject: Re: [PATCH 1/2] Documentation: usb: dwc3: add power down clock scale property Message-ID: <20190223003246.GA20964@bogus> References: <1548152179-19472-1-git-send-email-jun.li@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1548152179-19472-1-git-send-email-jun.li@nxp.com> To: Jun Li Cc: "mark.rutland@arm.com" , "balbi@kernel.org" , "linux-usb@vger.kernel.org" , "devicetree@vger.kernel.org" , dl-linux-imx List-ID: On Tue, Jan 22, 2019 at 10:37:17AM +0000, Jun Li wrote: > The USB3 suspend_clk input replaces pipe3_rx_pclk as a clock > source to a small part of the USB3 core that operates when the > SS PHY is in its lowest power(P3) state, and therefore does > not provide a clock. The power down scale specifies how many > suspend_clk periods fit into a 16 KHz clock period, details > can see DWC3 databook register GCTL.PWRDNSCALE. > > Signed-off-by: Li Jun > --- > Documentation/devicetree/bindings/usb/dwc3.txt | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt > index 3e4c38b..d1c8b62 100644 > --- a/Documentation/devicetree/bindings/usb/dwc3.txt > +++ b/Documentation/devicetree/bindings/usb/dwc3.txt > @@ -102,6 +102,12 @@ Optional properties: > more than one value, which means undefined length INCR burst type > enabled. The values can be 1, 4, 8, 16, 32, 64, 128 and 256. > > + - snps,power-down-scale: Power down scale field specifies how many suspend_clk > + periods fit into a 16 Khz clock period. When performing > + the division, round up the remainder. Suspend clock is > + from 32kHz to 125MHz, means the value range is 2~8000. > + (details see DWC_usb3 databook register GCTL.PWRDNSCALE). > + Sounds like the suspend_clk should be provided as a clock input so you can calculate this value. > - in addition all properties from usb-xhci.txt from the current directory are > supported as well > > -- > 2.7.4 >