linux-kernel - Re: [PATCH v2 2/5] clk: qcom: lpassaudiocc-sc7280: Add support for LPASS resets for QCM6490

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Message-ID: <936f151e-6951-4dea-95ed-35374ab249cf@quicinc.com>
Date: Fri, 13 Sep 2024 11:01:01 +0530
From: Taniya Das <quic_tdas@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        "Stephen
 Boyd" <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Konrad Dybcio
	<konradybcio@...nel.org>, <quic_imrashai@...cinc.com>,
        <quic_jkona@...cinc.com>
CC: <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] clk: qcom: lpassaudiocc-sc7280: Add support for
 LPASS resets for QCM6490



On 8/17/2024 2:55 PM, Krzysztof Kozlowski wrote:
> On 16/08/2024 10:32, Taniya Das wrote:
>> On the QCM6490 boards the LPASS firmware controls the complete clock
>> controller functionalities. But the LPASS resets are required to be
>> controlled from the high level OS. The Audio SW driver should be able to
>> assert/deassert the audio resets as required. Thus in clock driver add
>> support for the resets.
>>
>> Signed-off-by: Taniya Das <quic_tdas@...cinc.com>
>> ---
>>   drivers/clk/qcom/lpassaudiocc-sc7280.c | 23 +++++++++++++++++++----
>>   1 file changed, 19 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/clk/qcom/lpassaudiocc-sc7280.c b/drivers/clk/qcom/lpassaudiocc-sc7280.c
>> index 45e726477086..b64393089263 100644
>> --- a/drivers/clk/qcom/lpassaudiocc-sc7280.c
>> +++ b/drivers/clk/qcom/lpassaudiocc-sc7280.c
>> @@ -1,6 +1,7 @@
>>   // SPDX-License-Identifier: GPL-2.0-only
>>   /*
>>    * Copyright (c) 2021, The Linux Foundation. All rights reserved.
>> + * Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved.
>>    */
>>   
>>   #include <linux/clk-provider.h>
>> @@ -713,14 +714,24 @@ static const struct qcom_reset_map lpass_audio_cc_sc7280_resets[] = {
>>   	[LPASS_AUDIO_SWR_WSA_CGCR] = { 0xb0, 1 },
>>   };
>>   
>> +static const struct regmap_config lpass_audio_cc_sc7280_reset_regmap_config = {
>> +	.name = "lpassaudio_cc_reset",
>> +	.reg_bits = 32,
>> +	.reg_stride = 4,
>> +	.val_bits = 32,
>> +	.fast_io = true,
>> +	.max_register = 0xc8,
>> +};
>> +
>>   static const struct qcom_cc_desc lpass_audio_cc_reset_sc7280_desc = {
>> -	.config = &lpass_audio_cc_sc7280_regmap_config,
>> +	.config = &lpass_audio_cc_sc7280_reset_regmap_config,
>>   	.resets = lpass_audio_cc_sc7280_resets,
>>   	.num_resets = ARRAY_SIZE(lpass_audio_cc_sc7280_resets),
>>   };
>>   
>>   static const struct of_device_id lpass_audio_cc_sc7280_match_table[] = {
>> -	{ .compatible = "qcom,sc7280-lpassaudiocc" },
>> +	{ .compatible = "qcom,qcm6490-lpassaudiocc", .data = &lpass_audio_cc_reset_sc7280_desc },
> 
> That's odd to see sc7280 reset added for qcm6490, but not used fot
> sc7280 at all. Didn't you mean here lpass_audio_cc_qcm6409_desc?
> 
> 
The resets descriptor(lpass_audio_cc_reset_sc7280_desc) is not part of 
the global clock descriptor(lpass_cc_sc7280_desc) as these are part of 
different regmaps.

On a non-QCM6490(SC7280) boards the resets are registered after the 
global descriptor is registered.

But on QCM6490 board we need to register only the reset descriptor and 
no clocks are to be handled/registered and thus passed the match data 
for QCM6490 boards only.

> Best regards,
> Krzysztof
> 

-- 
Thanks & Regards,
Taniya Das.