linux-kernel - Re: [PATCH v5 07/13] wifi: ath12k: add support for fixed QMI firmware memory

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Message-ID: <7d5f7b4c-2a55-41c7-b85c-cb4cd76d553f@quicinc.com>
Date: Mon, 3 Feb 2025 15:14:27 +0530
From: Raj Kumar Bhagat <quic_rajkbhag@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, <ath12k@...ts.infradead.org>
CC: <linux-wireless@...r.kernel.org>, Kalle Valo <kvalo@...nel.org>,
        Rob
 Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor
 Dooley <conor+dt@...nel.org>,
        Jeff Johnson <jjohnson@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 07/13] wifi: ath12k: add support for fixed QMI firmware
 memory

On 1/30/2025 1:16 PM, Krzysztof Kozlowski wrote:
> On 30/01/2025 05:35, Raj Kumar Bhagat wrote:
>> @@ -2646,6 +2663,136 @@ static int ath12k_qmi_alloc_target_mem_chunk(struct ath12k_base *ab)
>>  	return ret;
>>  }
>>  
>> +static int ath12k_qmi_assign_target_mem_chunk(struct ath12k_base *ab)
>> +{
>> +	struct device_node *mem_node;
>> +	struct resource res, m3_res;
>> +	u32 bdf_start_addr;
>> +	int i, idx, ret;
>> +
>> +	for (i = 0, idx = 0; i < ab->qmi.mem_seg_count; i++) {
>> +		switch (ab->qmi.target_mem[i].type) {
>> +		case HOST_DDR_REGION_TYPE:
>> +			mem_node = ath12k_core_get_reserved_mem_by_name(ab, "q6-region");
> 
> 
> Why cannot you use existing API for reserved memory -
> of_reserved_mem_lookup()?
> 

The of_reserved_mem_lookup() requires reserved memory node to read the memory and
return in the structure "struct reserved_mem".

The of_reserved_mem_lookup() would be used after we get the reserved memory node
using the API - ath12k_core_get_reserved_mem_by_name(ab, "q6-region");

In next version we would use of_reserved_mem_lookup(), Something like below:
    mem_node = ath12k_core_get_reserved_mem_by_name(ab, "q6-region");
    struct reserved_mem res = of_reserved_mem_lookup(mem_node)