linux-kernel - Re: [PATCH v5 4/5] clk: qcom: ipq9574: Use icc-clk for enabling NoC related clocks

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Date: Thu, 28 Mar 2024 14:51:09 -0700
From: Stephen Boyd <sboyd@...nel.org>
To: andersson@...nel.org, conor+dt@...nel.org, devicetree@...r.kernel.org, djakov@...nel.org, dmitry.baryshkov@...aro.org, konrad.dybcio@...aro.org, krzysztof.kozlowski+dt@...aro.org, linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, mturquette@...libre.com, quic_anusha@...cinc.com, quic_varada@...cinc.com, robh@...nel.org
Subject: Re: [PATCH v5 4/5] clk: qcom: ipq9574: Use icc-clk for enabling NoC related clocks

Quoting Varadarajan Narayanan (2024-03-28 00:59:35)
> diff --git a/drivers/clk/qcom/gcc-ipq9574.c b/drivers/clk/qcom/gcc-ipq9574.c
> index 0a3f846695b8..187fd9dcdf49 100644
> --- a/drivers/clk/qcom/gcc-ipq9574.c
> +++ b/drivers/clk/qcom/gcc-ipq9574.c
> @@ -4301,6 +4302,56 @@ static const struct qcom_reset_map gcc_ipq9574_resets[] = {
>         [GCC_WCSS_Q6_TBU_BCR] = { 0x12054, 0 },
>  };
>  
> +#define IPQ_APPS_ID                    9574    /* some unique value */

How is this supposed to stay unique? I don't understand
icc_node_create() API quite honestly. Why can't icc_clk_register()
maintain some ida of allocated numbers? Or is there some global number
space that we can "reserve" from? I'm quite amazed this is how things
are connected in interconnect framework.

> +
> +enum {
> +       ICC_ANOC_PCIE0,
> +       ICC_SNOC_PCIE0,
> +       ICC_ANOC_PCIE1,
> +       ICC_SNOC_PCIE1,
> +       ICC_ANOC_PCIE2,
> +       ICC_SNOC_PCIE2,
> +       ICC_ANOC_PCIE3,
> +       ICC_SNOC_PCIE3,
> +       ICC_SNOC_USB,
> +       ICC_ANOC_USB_AXI,
> +       ICC_NSSNOC_NSSCC,
> +       ICC_NSSNOC_SNOC_0,
> +       ICC_NSSNOC_SNOC_1,
> +       ICC_NSSNOC_PCNOC_1,
> +       ICC_NSSNOC_QOSGEN_REF,
> +       ICC_NSSNOC_TIMEOUT_REF,
> +       ICC_NSSNOC_XO_DCD,
> +       ICC_NSSNOC_ATB,
> +       ICC_MEM_NOC_NSSNOC,
> +       ICC_NSSNOC_MEMNOC,
> +       ICC_NSSNOC_MEM_NOC_1,
> +};

Are these supposed to be in a dt-binding header?

> +
> +static struct clk_hw *icc_ipq9574_hws[] = {
> +       [ICC_ANOC_PCIE0] = &gcc_anoc_pcie0_1lane_m_clk.clkr.hw,
> +       [ICC_SNOC_PCIE0] = &gcc_anoc_pcie1_1lane_m_clk.clkr.hw,
> +       [ICC_ANOC_PCIE1] = &gcc_anoc_pcie2_2lane_m_clk.clkr.hw,
> +       [ICC_SNOC_PCIE1] = &gcc_anoc_pcie3_2lane_m_clk.clkr.hw,
> +       [ICC_ANOC_PCIE2] = &gcc_snoc_pcie0_1lane_s_clk.clkr.hw,
> +       [ICC_SNOC_PCIE2] = &gcc_snoc_pcie1_1lane_s_clk.clkr.hw,