linux-kernel - Re: [PATCH v6 5/6] clk: qcom: lpassaudiocc-sc7280: Merge lpasscc into lpass

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Message-ID: <CAE-0n50y4JEQqW2wgS_qoDkdrqP=bzpC6b_LpA6Q9P+jDc00ZQ@mail.gmail.com>
Date:   Mon, 30 Jan 2023 17:04:30 -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: [PATCH v6 5/6] clk: qcom: lpassaudiocc-sc7280: Merge lpasscc into lpass_aon

Quoting Srinivasa Rao Mandadapu (2023-01-26 02:14:24)
> Merge lpasscc clocks into lpass_aon clk_regmap structure as they
> are using same register space.
> Add conditional check for doing lpasscc clock registration only
> if regname specified in device tree node.
> In existing implementation, lpasscc clocks and lpass_aon clocks are
> being registered exclusively and overlapping if both of them are
> to be used.
> This is required to avoid such overlapping and to register
> lpasscc clocks and lpass_aon clocks simultaneously.

Can you describe the register ranges that are overlapping?

Here's what I see in DT right now:

                lpasscc: lpasscc@...0000 {
                        compatible = "qcom,sc7280-lpasscc";
                        reg = <0 0x03000000 0 0x40>,
                              <0 0x03c04000 0 0x4>;
                        ...
                };

                lpass_audiocc: clock-controller@...0000 {
                        compatible = "qcom,sc7280-lpassaudiocc";
                        reg = <0 0x03300000 0 0x30000>,
                              <0 0x032a9000 0 0x1000>;
                        ...
                };

                lpass_aon: clock-controller@...0000 {
                        compatible = "qcom,sc7280-lpassaoncc";
                        reg = <0 0x03380000 0 0x30000>;
                        ...
                };

                lpass_core: clock-controller@...0000 {
                        compatible = "qcom,sc7280-lpasscorecc";
                        reg = <0 0x03900000 0 0x50000>;
                        ...
                };

Presumably lpascc is really supposed to be a node named
'clock-controller' and is the node that is overlapping with lpass_aon?

>
> Fixes: 4ab43d171181 ("clk: qcom: Add lpass clock controller driver for SC7280")
> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
> Tested-by: Mohammad Rafi Shaik <quic_mohs@...cinc.com>
> ---
>  drivers/clk/qcom/lpassaudiocc-sc7280.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/clk/qcom/lpassaudiocc-sc7280.c b/drivers/clk/qcom/lpassaudiocc-sc7280.c
> index 1339f92..8e2f433 100644
> --- a/drivers/clk/qcom/lpassaudiocc-sc7280.c
> +++ b/drivers/clk/qcom/lpassaudiocc-sc7280.c
> @@ -826,10 +829,12 @@ static int lpass_aon_cc_sc7280_probe(struct platform_device *pdev)
>                 return ret;
>
>         if (of_property_read_bool(pdev->dev.of_node, "qcom,adsp-pil-mode")) {
> -               lpass_audio_cc_sc7280_regmap_config.name = "cc";
> -               desc = &lpass_cc_sc7280_desc;
> -               ret = qcom_cc_probe(pdev, desc);
> -               goto exit;
> +               res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cc");

We shouldn't need to check for reg-name property. Instead, the index
should be the only thing that matters.

> +               if (res) {
> +                       lpass_audio_cc_sc7280_regmap_config.name = "cc";
> +                       desc = &lpass_cc_sc7280_desc;