Hi Rob,
On 3/11/2023 5:40 AM, Rob Herring wrote:
On Wed, Mar 08, 2023 at 03:57:34PM -0800, Wesley Cheng wrote:
Add a new definition for specifying how many XHCI secondary interrupters
can be allocated. XHCI in general can potentially support up to 1024
interrupters, which some uses may want to limit depending on how many
users utilize the interrupters.
Signed-off-by: Wesley Cheng <quic_wcheng@xxxxxxxxxxx>
---
.../devicetree/bindings/usb/snps,dwc3.yaml | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index be36956af53b..4e2417191f93 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -359,6 +359,19 @@ properties:
items:
enum: [1, 4, 8, 16, 32, 64, 128, 256]
+ snps,num-hc-interrupters:
+ description:
+ Defines the maximum number of XHCI host controller interrupters that can
+ be supported. The XHCI host controller has support to allocate multiple
+ event rings, which can be assigned to different clients/users. The DWC3
+ controller has a maximum of 8 interrupters. If this is not defined then
+ the value will be defaulted to 1. This parameter is used only when
+ operating in host mode.
Is this an XHCI or DWC3 feature? The former should be added to the XHCI
binding.
Sorry for the late response...message got routed to a folder I don't
frequently check...
This is a XHCI feature, but the DWC3 design is built in a way that DWC3
host initializes the XHCI device and populates the properties associated
to XHCI dev.
Will update the XHCI yaml as well for non-DWC3 based SoCs.
Thanks
Wesley Cheng
