[v2,2/3] dt-bindings: dma: ti-edma: Document dma-channel-mask for EDMA
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Message ID 20190910114559.22810-3-peter.ujfalusi@ti.com
State Changes Requested
Headers show
Series
  • dmaengine: bindings/edma: dma-channel-mask to array
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Commit Message

Peter Ujfalusi Sept. 10, 2019, 11:45 a.m. UTC
Similarly to paRAM slots, channels can be used by other cores.

The common dma-channel-mask property can be used for specifying the
available channels.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
 Documentation/devicetree/bindings/dma/ti-edma.txt | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

Rob Herring Sept. 18, 2019, 1:29 p.m. UTC | #1
On Tue, Sep 10, 2019 at 02:45:58PM +0300, Peter Ujfalusi wrote:
> Similarly to paRAM slots, channels can be used by other cores.
> 
> The common dma-channel-mask property can be used for specifying the
> available channels.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> ---
>  Documentation/devicetree/bindings/dma/ti-edma.txt | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/dma/ti-edma.txt b/Documentation/devicetree/bindings/dma/ti-edma.txt
> index 4bbc94d829c8..3c7736246354 100644
> --- a/Documentation/devicetree/bindings/dma/ti-edma.txt
> +++ b/Documentation/devicetree/bindings/dma/ti-edma.txt
> @@ -42,6 +42,9 @@ Optional properties:
>  - ti,edma-reserved-slot-ranges: PaRAM slot ranges which should not be used by
>  		the driver, they are allocated to be used by for example the
>  		DSP. See example.
> +- dma-channel-mask: Mask of usable channels, see
> +		Documentation/devicetree/bindings/dma/dma-common.yaml
> +

What's the size? 2 cells?

>  
>  ------------------------------------------------------------------------------
>  eDMA3 Transfer Controller
> @@ -91,6 +94,9 @@ edma: edma@49000000 {
>  	ti,edma-memcpy-channels = <20 21>;
>  	/* The following PaRAM slots are reserved: 35-44 and 100-109 */
>  	ti,edma-reserved-slot-ranges = <35 10>, <100 10>;
> +	/* The following channels are reserved: 35-44 */
> +	dma-channel-mask = <0xffffffff>, /* Channel 0-31 */
> +			   <0xffffe007>; /* Channel 32-63 */
>  };
>  
>  edma_tptc0: tptc@49800000 {
> -- 
> Peter
> 
> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
>
Peter Ujfalusi Sept. 18, 2019, 2:06 p.m. UTC | #2
On 18/09/2019 16.29, Rob Herring wrote:
> On Tue, Sep 10, 2019 at 02:45:58PM +0300, Peter Ujfalusi wrote:
>> Similarly to paRAM slots, channels can be used by other cores.
>>
>> The common dma-channel-mask property can be used for specifying the
>> available channels.
>>
>> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
>> ---
>>  Documentation/devicetree/bindings/dma/ti-edma.txt | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/dma/ti-edma.txt b/Documentation/devicetree/bindings/dma/ti-edma.txt
>> index 4bbc94d829c8..3c7736246354 100644
>> --- a/Documentation/devicetree/bindings/dma/ti-edma.txt
>> +++ b/Documentation/devicetree/bindings/dma/ti-edma.txt
>> @@ -42,6 +42,9 @@ Optional properties:
>>  - ti,edma-reserved-slot-ranges: PaRAM slot ranges which should not be used by
>>  		the driver, they are allocated to be used by for example the
>>  		DSP. See example.
>> +- dma-channel-mask: Mask of usable channels, see
>> +		Documentation/devicetree/bindings/dma/dma-common.yaml
>> +
> 
> What's the size? 2 cells?

Depending on the EDMA, some have 32, some have 64 channels. I'll update
the patch to reflect this.

>>  
>>  ------------------------------------------------------------------------------
>>  eDMA3 Transfer Controller
>> @@ -91,6 +94,9 @@ edma: edma@49000000 {
>>  	ti,edma-memcpy-channels = <20 21>;
>>  	/* The following PaRAM slots are reserved: 35-44 and 100-109 */
>>  	ti,edma-reserved-slot-ranges = <35 10>, <100 10>;
>> +	/* The following channels are reserved: 35-44 */
>> +	dma-channel-mask = <0xffffffff>, /* Channel 0-31 */
>> +			   <0xffffe007>; /* Channel 32-63 */
>>  };
>>  
>>  edma_tptc0: tptc@49800000 {
>> -- 
>> Peter
>>
>> Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
>> Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
>>

- P├ęter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

Patch
diff mbox series

diff --git a/Documentation/devicetree/bindings/dma/ti-edma.txt b/Documentation/devicetree/bindings/dma/ti-edma.txt
index 4bbc94d829c8..3c7736246354 100644
--- a/Documentation/devicetree/bindings/dma/ti-edma.txt
+++ b/Documentation/devicetree/bindings/dma/ti-edma.txt
@@ -42,6 +42,9 @@  Optional properties:
 - ti,edma-reserved-slot-ranges: PaRAM slot ranges which should not be used by
 		the driver, they are allocated to be used by for example the
 		DSP. See example.
+- dma-channel-mask: Mask of usable channels, see
+		Documentation/devicetree/bindings/dma/dma-common.yaml
+
 
 ------------------------------------------------------------------------------
 eDMA3 Transfer Controller
@@ -91,6 +94,9 @@  edma: edma@49000000 {
 	ti,edma-memcpy-channels = <20 21>;
 	/* The following PaRAM slots are reserved: 35-44 and 100-109 */
 	ti,edma-reserved-slot-ranges = <35 10>, <100 10>;
+	/* The following channels are reserved: 35-44 */
+	dma-channel-mask = <0xffffffff>, /* Channel 0-31 */
+			   <0xffffe007>; /* Channel 32-63 */
 };
 
 edma_tptc0: tptc@49800000 {