linux-kernel - Re: [PATCH 4/5] dt-bindings: dma: ti-edma: Add option for reserved channel ranges

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Message-ID: <a4c5688b-cbeb-5059-5351-11d9ae1b25d5@ti.com>
Date:   Fri, 30 Aug 2019 08:37:33 +0300
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     Rob Herring <robh@...nel.org>
CC:     <vkoul@...nel.org>, <dan.j.williams@...el.com>,
        <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>
Subject: Re: [PATCH 4/5] dt-bindings: dma: ti-edma: Add option for reserved
 channel ranges

Rob,

On 30/08/2019 1.47, Rob Herring wrote:
> On Fri, Aug 23, 2019 at 03:56:17PM +0300, Peter Ujfalusi wrote:
>> Similarly to paRAM slots, channels can be used by other cores.
>>
>> Add optional property to configure the reserved channel ranges.
>>
>> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
>> ---
>>  Documentation/devicetree/bindings/dma/ti-edma.txt | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/dma/ti-edma.txt b/Documentation/devicetree/bindings/dma/ti-edma.txt
>> index 4bbc94d829c8..1198682ada99 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.
>> +- ti,edma-reserved-chan-ranges: channel ranges which should not be used by
>> +		the driver, they are allocated to be used by for example the
>> +		DSP. See example.
> 
> Based on the other thread, I think extending dma-channel-mask to a 
> uint32-array makes sense here.

Yes, that is the reason I have asked on that and I'm in progress of
converting the edma driver to use the dma-channel-mask.
Just need to do some shuffling in the driver to get the mask in a form
usable by the driver.

I'll send an updated series early next week.

- Péter

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