[v4] Introduce QC USB SND audio offloading support

[PATCH v4 13/32] dt-bindings: usb: dwc3: Add snps,num-hc-interrupters definition

Posted by Wesley Cheng 2 years, 1 month ago

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@quicinc.com>
---
 .../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 50edc4da780e..cc6012e922e0 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -376,6 +376,19 @@ 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.
+    $ref: /schemas/types.yaml#/definitions/uint8
+    minimum: 1
+    maximum: 8
+    default: 1
+
   port:
     $ref: /schemas/graph.yaml#/properties/port
     description:

Re: [PATCH v4 13/32] dt-bindings: usb: dwc3: Add snps,num-hc-interrupters definition

Posted by Krzysztof Kozlowski 2 years ago

On 25/07/2023 04:33, 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@quicinc.com>
> ---
>  .../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 50edc4da780e..cc6012e922e0 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -376,6 +376,19 @@ 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.
> +    $ref: /schemas/types.yaml#/definitions/uint8

You did not respond to Rob's comments before sending this patch. :(

Best regards,
Krzysztof

Re: [PATCH v4 13/32] dt-bindings: usb: dwc3: Add snps,num-hc-interrupters definition

Posted by Rob Herring 2 years, 1 month ago

On Mon, Jul 24, 2023 at 07:33:57PM -0700, 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.

Why does this belong in DT? What 'uses' determines the value? Who wants 
to change this and when?

> 
> Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
> ---
>  .../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 50edc4da780e..cc6012e922e0 100644
> --- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> +++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
> @@ -376,6 +376,19 @@ 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.
> +    $ref: /schemas/types.yaml#/definitions/uint8
> +    minimum: 1
> +    maximum: 8
> +    default: 1
> +
>    port:
>      $ref: /schemas/graph.yaml#/properties/port
>      description: