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

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Message-ID: <ya6aqhq27mizdozfhaa6evwt6kqjdryafozdxvwdm3l75cfd24@wloodcwrgkyu>
Date: Mon, 16 Sep 2024 11:55:17 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Taniya Das <quic_tdas@...cinc.com>, 
	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 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?

-- 
With best wishes
Dmitry