Hello Stefan, On Tue, Dec 04, 2018 at 09:40:26AM +0100, Stefan Wahren wrote: > Am 04.12.18 um 09:31 schrieb Uwe Kleine-König: > > The status quo on i.MX6 is that if "over-current-active-high" is > > specified in the device tree this is configured as expected. If > > the property is missing polarity isn't changed and so the > > polarity is kept as setup by the bootloader. Reset default is > > active high, so active low can only be used with help by the > > bootloader. On i.MX7 it is similar, but there disabling of > > over current detection has a similar inconsistency. > > > > This patch introduces a new property that allows to explicitly > > configure for active low over current detection and consistently > > sets this up. In the absence of an explicit configuration the > > bit is kept as is. On i.MX7 over current detection is used unless > > disabled in the device tree. > > > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> > > --- > > .../devicetree/bindings/usb/ci-hdrc-usb2.txt | 5 ++-- > > drivers/usb/chipidea/ci_hdrc_imx.c | 16 ++++++++--- > > drivers/usb/chipidea/ci_hdrc_imx.h | 8 +++++- > > drivers/usb/chipidea/usbmisc_imx.c | 28 ++++++++++++++----- > > 4 files changed, 43 insertions(+), 14 deletions(-) > > > > diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt > > index 529e51879fb2..c32f6e983cf6 100644 > > --- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt > > +++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt > > @@ -87,8 +87,9 @@ i.mx specific properties > > - fsl,usbmisc: phandler of non-core register device, with one > > argument that indicate usb controller index > > - disable-over-current: disable over current detect > > -- over-current-active-high: over current signal polarity is high active, > > - typically over current signal polarity is low active. > > +- over-current-active-low: over current signal polarity is active low. > > +- over-current-active-high: over current signal polarity is active high. > > + It's recommended to specify the over current polarity. > > - external-vbus-divider: enables off-chip resistor divider for Vbus > > > > Example: > > thanks for making this configurable. But shouldn't this be a separate > patch and reviewed by the devicetree guys? I'm not sure about the separate patch part. My impression is it depends on the maintainer if a change to the binding (opposed to the introduction of a binding) should be separate or not. But for the review you are right, I added the dt people to Cc for them to comment. In v2 Matthew also noted that he would prefer to handle the situation when both over-current-active-low and over-current-active-high were given differently. I think we don't need that as this is a case of "broken dt" and it doesn't matter much what is done then. (With my patch we're configuring for active high in that case.) A feedback here would be great, too. Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | http://www.pengutronix.de/ |
