linux-kernel - Re: [PATCH v2 3/4] dmaengine: ti: k3-udma-glue: Add function to request TX channel by ID

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Message-ID: <cb93763e-28d3-402a-a5fa-34936646bc0a@ti.com>
Date: Mon, 18 Dec 2023 10:00:34 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: Péter Ujfalusi <peter.ujfalusi@...il.com>
CC: <vkoul@...nel.org>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <srk@...com>, <vigneshr@...com>, <s-vadapalli@...com>
Subject: Re: [PATCH v2 3/4] dmaengine: ti: k3-udma-glue: Add function to
 request TX channel by ID



On 17/12/23 16:48, Péter Ujfalusi wrote:
> 
> 
> On 15/12/2023 08:08, Siddharth Vadapalli wrote:
>>>>  err:
>>>> @@ -395,6 +410,40 @@ struct k3_udma_glue_tx_channel *k3_udma_glue_request_tx_chn(struct device *dev,
>>>>  }
>>>>  EXPORT_SYMBOL_GPL(k3_udma_glue_request_tx_chn);
>>>>  
>>>> +struct k3_udma_glue_tx_channel *
>>>> +k3_udma_glue_request_tx_chn_by_id(struct device *dev, struct k3_udma_glue_tx_channel_cfg *cfg,
>>>> +				  struct device_node *udmax_np, u32 thread_id)
>>>
>>> udmax_np is not dev->of_node ?
>>
>> I am not sure I fully understand the question. If you meant to ask if the driver
>> which uses this API will not have its device's of_node set to udmax_np, then yes
>> that's correct.
>>
>> The driver shall be probed over RPMsg-bus, due to which its device's of_node
>> will not be udmax_np. Additionally, the udmax_np is the device-tree node of one
>> of the DMA Controllers described in the device-tree. The driver shall obtain the
>> reference to the udmax_np node using the API:
>> of_find_compatible_node()
>> with the compatible to be passed to the above API being a part of the driver's
>> data. Thus, it is possible to specify which DMA Controller to use by specifying
>> the compatible in the driver's data. I hope that I have answered your question.
>> Please let me know otherwise.
> 
> I see, thank you for the detailed explanation!
> 
>> Thank you for reviewing the series. I will rename the API as mentioned above and
>> if the question you had above regarding the of_node has been addressed, I will
>> post the v3 series. Kindly let me know.
> 
> I don't have other open issues, thanks for the updates
> 

Thank you for the confirmation. I will implement your suggestions and post the
v3 series.

-- 
Regards,
Siddharth.