lkml.org 
[lkml]   [2023]   [May]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH net-next V3 1/3] dt-bindings: net: xilinx_axienet: Introduce dmaengine binding support
From
On 11/05/2023 13:32, Gaddam, Sarath Babu Naidu wrote:
>
>
>> -----Original Message-----
>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>> Sent: Wednesday, May 10, 2023 3:39 PM
>> To: Gaddam, Sarath Babu Naidu
>> <sarath.babu.naidu.gaddam@amd.com>; davem@davemloft.net;
>> edumazet@google.com; kuba@kernel.org; pabeni@redhat.com;
>> robh+dt@kernel.org; krzysztof.kozlowski+dt@linaro.org
>> Cc: linux@armlinux.org.uk; Simek, Michal <michal.simek@amd.com>;
>> Pandey, Radhey Shyam <radhey.shyam.pandey@amd.com>;
>> netdev@vger.kernel.org; devicetree@vger.kernel.org; linux-arm-
>> kernel@lists.infradead.org; linux-kernel@vger.kernel.org; Sarangi,
>> Anirudha <anirudha.sarangi@amd.com>; Katakam, Harini
>> <harini.katakam@amd.com>; git (AMD-Xilinx) <git@amd.com>
>> Subject: Re: [PATCH net-next V3 1/3] dt-bindings: net: xilinx_axienet:
>> Introduce dmaengine binding support
>>
>> On 10/05/2023 10:50, Sarath Babu Naidu Gaddam wrote:
>>> From: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
>>>
>>> The axiethernet driver will use dmaengine framework to communicate
>>> with dma controller IP instead of built-in dma programming sequence.
>>
>> Subject: drop second/last, redundant "bindings". The "dt-bindings"
>> prefix is already stating that these are bindings.
>>
>> Actually also drop "dmaenging" as it is Linuxism. Focus on hardware, e.g.
>> "Add DMA support".
>>
>>>
>>> To request dma transmit and receive channels the axiethernet driver
>>> uses generic dmas, dma-names properties.
>>>
>>> Also to support the backward compatibility, use "dmas" property to
>>> identify as it should use dmaengine framework or legacy
>>> driver(built-in dma programming).
>>>
>>> At this point it is recommended to use dmaengine framework but it's
>>> optional. Once the solution is stable will make dmas as required
>>> properties.
>>>
>>> Signed-off-by: Radhey Shyam Pandey
>> <radhey.shyam.pandey@xilinx.com>
>>> Signed-off-by: Sarath Babu Naidu Gaddam
>>> <sarath.babu.naidu.gaddam@amd.com>
>>> ---
>>> These changes are on top of below txt to yaml conversion discussion
>>> https://lore.kernel.org/all/20230308061223.1358637-1-
>> sarath.babu.naidu
>>> .gaddam@amd.com/#Z2e.:20230308061223.1358637-1-
>> sarath.babu.naidu.gadda
>>> m::40amd.com:1bindings:net:xlnx::2caxi-ethernet.yaml
>>>
>>> Changes in V3:
>>> 1) Reverted reg and interrupts property to support backward
>> compatibility.
>>> 2) Moved dmas and dma-names properties from Required properties.
>>>
>>> Changes in V2:
>>> - None.
>>> ---
>>> .../devicetree/bindings/net/xlnx,axi-ethernet.yaml | 12
>> ++++++++++++
>>> 1 file changed, 12 insertions(+)
>>>
>>> diff --git
>>> a/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
>>> b/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
>>> index 80843c177029..9dfa1976e260 100644
>>> --- a/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
>>> +++ b/Documentation/devicetree/bindings/net/xlnx,axi-ethernet.yaml
>>> @@ -122,6 +122,16 @@ properties:
>>> modes, where "pcs-handle" should be used to point to the PCS/PMA
>> PHY,
>>> and "phy-handle" should point to an external PHY if exists.
>>>
>>> + dmas:
>>> + items:
>>> + - description: TX DMA Channel phandle and DMA request line
>> number
>>> + - description: RX DMA Channel phandle and DMA request line
>>> + number
>>> +
>>> + dma-names:
>>> + items:
>>> + - const: tx_chan0
>>
>> tx
>>
>>> + - const: rx_chan0
>>
>> rx
>
> We want to support more channels in the future, currently we support
> AXI DMA which has only one tx and rx channel. In future we want to
> extend support for multichannel DMA (MCDMA) which has 16 TX and
> 16 RX channels. To uniquely identify each channel, we are using chan
> suffix. Depending on the usecase AXI ethernet driver can request any
> combination of multichannel DMA channels.
>
> dma-names = tx_chan0, tx_chan1, rx_chan0, rx_chan1;
>
> will update the commit message with same.

I expect the binding to be complete, otherwise you get comments like
this. Add missing parts to the binding and resend.

Best regards,
Krzysztof

\
 
 \ /
  Last update: 2023-05-12 08:28    [W:0.115 / U:0.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site