| Message ID | 20190516055307.25737-27-mmaddireddy@nvidia.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | Enable Tegra PCIe root port features | expand |
On Thu, May 16, 2019 at 11:23:05AM +0530, Manikanta Maddireddy wrote: > Add DT binding for "reset-gpios" property which supports GPIO based PERST# > signal. > > Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com> > Reviewed-by: Rob Herring <robh@kernel.org> > Acked-by: Thierry Reding <treding@nvidia.com> > --- > V4: No change > > V3: Moved to common pci binding doc > > V2: Using standard "reset-gpio" property > > Documentation/devicetree/bindings/pci/pci.txt | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt > index c77981c5dd18..79124898aa5b 100644 > --- a/Documentation/devicetree/bindings/pci/pci.txt > +++ b/Documentation/devicetree/bindings/pci/pci.txt > @@ -24,3 +24,6 @@ driver implementation may support the following properties: > unsupported link speed, for instance, trying to do training for > unsupported link speed, etc. Must be '4' for gen4, '3' for gen3, '2' > for gen2, and '1' for gen1. Any other values are invalid. > +- reset-gpios: > + If present this property specifies PERST# GPIO. Host drivers can parse the > + GPIO and apply fundamental reset to endpoints. As mentioned in patch 27/28, maybe mention here that this is only a workaround for bad board designs and that it shouldn't be necessary in the majority of cases. Thierry
On 17-Jun-19 5:00 PM, Thierry Reding wrote: > On Thu, May 16, 2019 at 11:23:05AM +0530, Manikanta Maddireddy wrote: >> Add DT binding for "reset-gpios" property which supports GPIO based PERST# >> signal. >> >> Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com> >> Reviewed-by: Rob Herring <robh@kernel.org> >> Acked-by: Thierry Reding <treding@nvidia.com> >> --- >> V4: No change >> >> V3: Moved to common pci binding doc >> >> V2: Using standard "reset-gpio" property >> >> Documentation/devicetree/bindings/pci/pci.txt | 3 +++ >> 1 file changed, 3 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt >> index c77981c5dd18..79124898aa5b 100644 >> --- a/Documentation/devicetree/bindings/pci/pci.txt >> +++ b/Documentation/devicetree/bindings/pci/pci.txt >> @@ -24,3 +24,6 @@ driver implementation may support the following properties: >> unsupported link speed, for instance, trying to do training for >> unsupported link speed, etc. Must be '4' for gen4, '3' for gen3, '2' >> for gen2, and '1' for gen1. Any other values are invalid. >> +- reset-gpios: >> + If present this property specifies PERST# GPIO. Host drivers can parse the >> + GPIO and apply fundamental reset to endpoints. > As mentioned in patch 27/28, maybe mention here that this is only a > workaround for bad board designs and that it shouldn't be necessary in > the majority of cases. > > Thierry This is common DT binding doc, I cannot add Tegra specific here. reset-gpios is common DT prop, so Rob asked me to add it in common file. Manikanta
On Mon, Jun 17, 2019 at 05:08:45PM +0530, Manikanta Maddireddy wrote: > > > On 17-Jun-19 5:00 PM, Thierry Reding wrote: > > On Thu, May 16, 2019 at 11:23:05AM +0530, Manikanta Maddireddy wrote: > >> Add DT binding for "reset-gpios" property which supports GPIO based PERST# > >> signal. > >> > >> Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com> > >> Reviewed-by: Rob Herring <robh@kernel.org> > >> Acked-by: Thierry Reding <treding@nvidia.com> > >> --- > >> V4: No change > >> > >> V3: Moved to common pci binding doc > >> > >> V2: Using standard "reset-gpio" property > >> > >> Documentation/devicetree/bindings/pci/pci.txt | 3 +++ > >> 1 file changed, 3 insertions(+) > >> > >> diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt > >> index c77981c5dd18..79124898aa5b 100644 > >> --- a/Documentation/devicetree/bindings/pci/pci.txt > >> +++ b/Documentation/devicetree/bindings/pci/pci.txt > >> @@ -24,3 +24,6 @@ driver implementation may support the following properties: > >> unsupported link speed, for instance, trying to do training for > >> unsupported link speed, etc. Must be '4' for gen4, '3' for gen3, '2' > >> for gen2, and '1' for gen1. Any other values are invalid. > >> +- reset-gpios: > >> + If present this property specifies PERST# GPIO. Host drivers can parse the > >> + GPIO and apply fundamental reset to endpoints. > > As mentioned in patch 27/28, maybe mention here that this is only a > > workaround for bad board designs and that it shouldn't be necessary in > > the majority of cases. > > > > Thierry > > This is common DT binding doc, I cannot add Tegra specific here. > reset-gpios is common DT prop, so Rob asked me to add it in common file. Ah, indeed. Alright, let's document it in the Tegra driver patch, then. Thierry
diff --git a/Documentation/devicetree/bindings/pci/pci.txt b/Documentation/devicetree/bindings/pci/pci.txt index c77981c5dd18..79124898aa5b 100644 --- a/Documentation/devicetree/bindings/pci/pci.txt +++ b/Documentation/devicetree/bindings/pci/pci.txt @@ -24,3 +24,6 @@ driver implementation may support the following properties: unsupported link speed, for instance, trying to do training for unsupported link speed, etc. Must be '4' for gen4, '3' for gen3, '2' for gen2, and '1' for gen1. Any other values are invalid. +- reset-gpios: + If present this property specifies PERST# GPIO. Host drivers can parse the + GPIO and apply fundamental reset to endpoints.