> -----Original Message----- > From: Mark Rutland [mailto:mark.rutland@xxxxxxx] > Sent: Thursday, July 23, 2015 4:27 PM > To: Badola Nikhil-B46172 > Cc: linux-kernel@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; balbi@xxxxxx > Subject: Re: [PATCH 1/3] Documentation: dt: dwc3: Add snps,configure-fladj > property > > On Thu, Jul 23, 2015 at 11:52:19AM +0100, Badola Nikhil wrote: > > > -----Original Message----- > > > From: Mark Rutland [mailto:mark.rutland@xxxxxxx] > > > Sent: Thursday, July 23, 2015 3:27 PM > > > To: Badola Nikhil-B46172 > > > Cc: linux-kernel@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; > > > balbi@xxxxxx > > > Subject: Re: [PATCH 1/3] Documentation: dt: dwc3: Add > > > snps,configure-fladj property > > > > > > On Thu, Jul 23, 2015 at 11:09:21AM +0100, Nikhil Badola wrote: > > > > Add property snps,configure-fladj for enabling post silicon frame > > > > length adjustment > > > > > > > > Signed-off-by: Nikhil Badola <nikhil.badola@xxxxxxxxxxxxx> > > > > --- > > > > Documentation/devicetree/bindings/usb/dwc3.txt | 1 + > > > > 1 file changed, 1 insertion(+) > > > > > > > > diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt > > > > b/Documentation/devicetree/bindings/usb/dwc3.txt > > > > index 0815eac..90c3972 100644 > > > > --- a/Documentation/devicetree/bindings/usb/dwc3.txt > > > > +++ b/Documentation/devicetree/bindings/usb/dwc3.txt > > > > @@ -40,6 +40,7 @@ Optional properties: > > > > - snps,hird-threshold: HIRD threshold > > > > - snps,hsphy_interface: High-Speed PHY interface selection > > > > between > > > "utmi" for > > > > UTMI+ and "ulpi" for ULPI when the DWC_USB3_HSPHY_INTERFACE > > > > has > > > value 3. > > > > + - snps,configure-fladj: enables post-silicon frame length > > > > + adjustment > > > > > > Could you elaborate on what this means and why you think it's > necessary? > > > > This property enables the use of GFLADJ_30MHZ field value of gfladj > > register for frame length adjustment instead of considering from the > sideband input signal fladj_30mhz_reg from SOC. > > This is required when signal fladj_30mhz_reg is connected to a wrong > > value or is not valid as in our case, hence post-silicon. > > Ok, so this is basically an override for the GFLADJ_30MHZ field of the gfladj > register when there was a problem at integration time. > That's right. > > However this field can be used to adjust any offset ranging from 00h > > to 3Fh, from the clock source generating SOF(start of frame) packets. > > Thus, this property can be added to device tree with appropriate > adjustment value. > > It takes a value? The description above makes it sound like a boolean > property. > > I'd expect a description more like: > > - snps,fladj-override: Value for GFLADJ_30MHZ when the fladj_30mhz_reg > signal is invalid or incorrect. > > Which makes it clear what the value is and when it should be set. Agreed. Will change and send a new version of the patch-set. > > Thanks, > Mark. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
