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

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Message-ID: <Zgfbs5SFN2cA0gSK@hu-varada-blr.qualcomm.com>
Date: Sat, 30 Mar 2024 15:00:27 +0530
From: Varadarajan Narayanan <quic_varada@...cinc.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC: Stephen Boyd <sboyd@...nel.org>, <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>,
        <robh@...nel.org>
Subject: Re: [PATCH v5 4/5] clk: qcom: ipq9574: Use icc-clk for enabling NoC
 related clocks

On Fri, Mar 29, 2024 at 01:10:03PM +0100, Krzysztof Kozlowski wrote:
> On 29/03/2024 11:55, Varadarajan Narayanan wrote:
> >>> +
> >>> +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?
> >
> > Since these don't directly relate to the ids in the dt-bindings
> > not sure if they will be permitted there. Will move and post a
> > new version and get feedback.
>
> You can answer this by yourself by looking at your DTS. Do you use them
> as well in the DTS?

I can use them in the DTS. The icc-clk framework automatically
creates master and slave nodes as 'n' and 'n+1'. Hence I can have
something like this in the dt-bindings include file

	#define ICC_ANOC_PCIE0		0
	#define ICC_SNOC_PCIE0		1
		.
		.
		.
	#define ICC_NSSNOC_MEM_NOC_1	20

	#define MASTER(x)	((ICC_ ## x) * 2)
	#define SLAVE(x)	(MASTER(x) + 1)

> It's a pity we see here only parts of DTS, instead of full interconnect
> usage.

Unfortunately cannot include the pcie dts changes with this
patch, but you can refer to them at https://lore.kernel.org/linux-arm-msm/20230519090219.15925-5-quic_devipriy@quicinc.com/

The above macros will be used in the pcie node as follows

pcie0: pci@...00000 {
	compatible = "qcom,pcie-ipq9574";
	. . .
	interconnects = <&gcc MASTER(ANOC_PCIE0) &gcc SLAVE(ANOC_PCIE0)>,
			<&gcc MASTER(SNOC_PCIE0) &gcc SLAVE(SNOC_PCIE0)>;
	interconnect-names = "pcie-mem", "cpu-pcie";
	. . .
};

Hope this is acceptable.

Thanks
Varada