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

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Message-ID: <7aca503d-4a8f-4c3e-ae1e-b95d49c65a85@quicinc.com>
Date: Fri, 24 Jan 2025 16:02:36 +0530
From: Taniya Das <quic_tdas@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>
CC: 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>, <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 9/16/2024 2:33 PM, Krzysztof Kozlowski wrote:
> On 16/09/2024 10:55, Dmitry Baryshkov wrote:
>> On Mon, Sep 16, 2024 at 10:33:21AM GMT, Krzysztof Kozlowski wrote:
>>> On 13/09/2024 07:31, Taniya Das wrote:
>>>>
>>>>
>>>> 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.
>>>
>>> Yeah, but why this is sc7280?
>>
>> Because it's more or less the same HW, different TZ and hyp firmware?
>>
> 
> Hm, ok, probably I missed something from the context.
>

Apologies for responding on this thread later than expected.
Yes as Dmitry mentioned, it is the same HW, TZ and HYP firmware are 
different.

> Best regards,
> Krzysztof



-- 
Thanks & Regards,
Taniya Das.