| Message ID | 20200817030324.5690-2-crystal.guo@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | introduce TI reset controller for MT8192 SoC | expand |
On Mon, Aug 17, 2020 at 11:03:21AM +0800, Crystal Guo wrote: > introduce 'reset' method to allow device do serialized assert and > deassert operations in a single step, which needs a minimum delay > to be waited between assert and deassert. Why is Mediatek adding to a TI binding? > > Signed-off-by: Crystal Guo <crystal.guo@mediatek.com> > --- > Documentation/devicetree/bindings/reset/ti-syscon-reset.txt | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt b/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt > index 86945502ccb5..ab041032339b 100644 > --- a/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt > +++ b/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt > @@ -59,6 +59,11 @@ Required properties: > Please also refer to Documentation/devicetree/bindings/reset/reset.txt for > common reset controller usage by consumers. > > +Optional properties: > +- reset-duration-us: When do serialized assert and deassert operations, minimum delay in microseconds > +is needed to be waited between an assert and a deassert to reset the device. This value can be 0, 0 means > +that such a delay is not needed. This goes in the reset controller node or each consumer? For the latter, it should be a cell in 'resets' if you need this. But really, I think the reset controller should enforce some minimum time that works for all consumers. Surely having a minimum time per reset isn't really needed. Rob
On Wed, 2020-08-26 at 01:42 +0800, Rob Herring wrote: > On Mon, Aug 17, 2020 at 11:03:21AM +0800, Crystal Guo wrote: > > introduce 'reset' method to allow device do serialized assert and > > deassert operations in a single step, which needs a minimum delay > > to be waited between assert and deassert. > > Why is Mediatek adding to a TI binding? TI reset-controller provides a common reset management, and is suitable for Mediatek SoCs, thus Mediatek wants to reuse this driver for reset. > > > > > Signed-off-by: Crystal Guo <crystal.guo@mediatek.com> > > --- > > Documentation/devicetree/bindings/reset/ti-syscon-reset.txt | 5 +++++ > > 1 file changed, 5 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt b/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt > > index 86945502ccb5..ab041032339b 100644 > > --- a/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt > > +++ b/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt > > @@ -59,6 +59,11 @@ Required properties: > > Please also refer to Documentation/devicetree/bindings/reset/reset.txt for > > common reset controller usage by consumers. > > > > +Optional properties: > > +- reset-duration-us: When do serialized assert and deassert operations, minimum delay in microseconds > > +is needed to be waited between an assert and a deassert to reset the device. This value can be 0, 0 means > > +that such a delay is not needed. > > This goes in the reset controller node or each consumer? For the latter, > it should be a cell in 'resets' if you need this. But really, I think > the reset controller should enforce some minimum time that works for all > consumers. Surely having a minimum time per reset isn't really needed. > > Rob 'reset-duration-us' will be in the reset controller node, and it's optional. If minimum delay is needed to be waited between an assert and a deassert to reset the device, this property will be set.Otherwise no need to set this property. Best Regards Crystal
diff --git a/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt b/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt index 86945502ccb5..ab041032339b 100644 --- a/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt +++ b/Documentation/devicetree/bindings/reset/ti-syscon-reset.txt @@ -59,6 +59,11 @@ Required properties: Please also refer to Documentation/devicetree/bindings/reset/reset.txt for common reset controller usage by consumers. +Optional properties: +- reset-duration-us: When do serialized assert and deassert operations, minimum delay in microseconds +is needed to be waited between an assert and a deassert to reset the device. This value can be 0, 0 means +that such a delay is not needed. + Example: -------- The following example demonstrates a syscon node, the reset controller node
introduce 'reset' method to allow device do serialized assert and deassert operations in a single step, which needs a minimum delay to be waited between assert and deassert. Signed-off-by: Crystal Guo <crystal.guo@mediatek.com> --- Documentation/devicetree/bindings/reset/ti-syscon-reset.txt | 5 +++++ 1 file changed, 5 insertions(+)