Kaanapali introduces changes in DSP IOVA layout and CDSP DMA addressing
that differ from previous SoCs. The SID field moves within the physical
address, and CDSP now supports a wider DMA range, requiring updated
sid_pos and DMA mask handling in the driver.

Signed-off-by: Kumari Pallavi <kumari.pallavi@oss.qualcomm.com>
---
 Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
index 3f6199fc9ae6..142309e2c656 100644
--- a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
+++ b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
@@ -18,7 +18,12 @@ description: |
 
 properties:
   compatible:
-    const: qcom,fastrpc
+    oneOf:
+      - items:
+          - enum:
+              - qcom,kaanapali-fastrpc
+          - const: qcom,fastrpc
+      - const: qcom,fastrpc
 
   label:
     enum:
-- 
2.34.1

On Thu, Dec 11, 2025 at 03:39:30PM +0530, Kumari Pallavi wrote:
> Kaanapali introduces changes in DSP IOVA layout and CDSP DMA addressing
> that differ from previous SoCs. The SID field moves within the physical
> address, and CDSP now supports a wider DMA range, requiring updated
> sid_pos and DMA mask handling in the driver.
> 
> Signed-off-by: Kumari Pallavi <kumari.pallavi@oss.qualcomm.com>
> ---
>  Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
> index 3f6199fc9ae6..142309e2c656 100644
> --- a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
> +++ b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
> @@ -18,7 +18,12 @@ description: |
>  
>  properties:
>    compatible:
> -    const: qcom,fastrpc
> +    oneOf:
> +      - items:
> +          - enum:
> +              - qcom,kaanapali-fastrpc
> +          - const: qcom,fastrpc

Does the driver work at all on this platform without the changes in this 
series? If not, then it is not compatible with "qcom,fastrpc" as you 
say here.

Rob

On 12/11/2025 9:11 PM, Rob Herring wrote:
> On Thu, Dec 11, 2025 at 03:39:30PM +0530, Kumari Pallavi wrote:
>> Kaanapali introduces changes in DSP IOVA layout and CDSP DMA addressing
>> that differ from previous SoCs. The SID field moves within the physical
>> address, and CDSP now supports a wider DMA range, requiring updated
>> sid_pos and DMA mask handling in the driver.
>>
>> Signed-off-by: Kumari Pallavi <kumari.pallavi@oss.qualcomm.com>
>> ---
>>   Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml | 7 ++++++-
>>   1 file changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
>> index 3f6199fc9ae6..142309e2c656 100644
>> --- a/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
>> +++ b/Documentation/devicetree/bindings/misc/qcom,fastrpc.yaml
>> @@ -18,7 +18,12 @@ description: |
>>   
>>   properties:
>>     compatible:
>> -    const: qcom,fastrpc
>> +    oneOf:
>> +      - items:
>> +          - enum:
>> +              - qcom,kaanapali-fastrpc
>> +          - const: qcom,fastrpc
> 
> Does the driver work at all on this platform without the changes in this
> series? If not, then it is not compatible with "qcom,fastrpc" as you
> say here.
> 

Thanks for the clarification
No, it doesn't work on kaanapali without this patch series
I have updated the bindings accordingly to allow
either "qcom,kaanapali-fastrpc" for Kaanapali or "qcom,fastrpc"
for older platforms

properties:
   compatible:
     enum:
       - qcom,kaanapali-fastrpc
       - qcom,fastrpc

Regards,
Pallavi

> Rob