linux-kernel - Re: [RESEND v3 4/4] clk: qcom: lpasscc-sc7280: Add resets for audioreach

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Date:   Thu, 12 Jan 2023 11:35:14 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
        agross@...nel.org, andersson@...nel.org, broonie@...nel.org,
        konrad.dybcio@...ainline.org, krzysztof.kozlowski+dt@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, mturquette@...libre.com,
        quic_plai@...cinc.com, quic_rohkumar@...cinc.com,
        robh+dt@...nel.org
Subject: Re: [RESEND v3 4/4] clk: qcom: lpasscc-sc7280: Add resets for audioreach

Quoting Srinivasa Rao Mandadapu (2023-01-11 23:53:23)
>
> On 1/12/2023 2:54 AM, Stephen Boyd wrote:
> Thanks for your time Stephen!!!
> > Quoting Srinivasa Rao Mandadapu (2023-01-04 08:21:37)
> >> diff --git a/drivers/clk/qcom/lpasscc-sc7280.c b/drivers/clk/qcom/lpasscc-sc7280.c
> >> index 85dd5b9..1efb72d 100644
> >> --- a/drivers/clk/qcom/lpasscc-sc7280.c
> >> +++ b/drivers/clk/qcom/lpasscc-sc7280.c
> >> @@ -102,6 +104,18 @@ static const struct qcom_cc_desc lpass_qdsp6ss_sc7280_desc = {
> >>          .num_clks = ARRAY_SIZE(lpass_qdsp6ss_sc7280_clocks),
> >>   };
> >>
> >> +static const struct qcom_reset_map lpass_cc_sc7280_resets[] = {
> >> +       [LPASS_AUDIO_SWR_RX_CGCR] =  { 0xa0, 1 },
> >> +       [LPASS_AUDIO_SWR_TX_CGCR] =  { 0xa8, 1 },
> >> +       [LPASS_AUDIO_SWR_WSA_CGCR] = { 0xb0, 1 },
> > Why are we adding these resets again? These are already exposed in
> > lpassaudiocc-sc7280.c
>
> As explained in previous versions, legacy path nodes are not being used
> in ADSP based platforms, due to conflicts.

What is legacy path nodes?

>
> Hence lpasscc node alone being used exclusively in ADSP based solution,
> resets are added.

I think I understand..

>
> In probe also, these reset controls are enabled based on
> "qcom,adsp-pil-mode" property.
>

but now I'm super confused! Please help me! We shouldn't have two
different device nodes for the same physical hardware registers.
Instead, we should have one node. The "qcom,adsp-pil-mode" property was
supposed to indicate the different mode of operation.

Maybe the audio clk and reset drivers on sc7280 are duplicating each
other and one of them can be removed?