linux-kernel - Re: [PATCH V5 4/6] arm64: dts: qcom: ipq9574: Add PCIe PHYs and controller nodes

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Date: Thu, 23 May 2024 12:37:50 +0530
From: Devi Priya <quic_devipriy@...cinc.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
CC: <bhelgaas@...gle.com>, <lpieralisi@...nel.org>, <kw@...ux.com>,
        <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <andersson@...nel.org>, <konrad.dybcio@...aro.org>,
        <mturquette@...libre.com>, <sboyd@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-clk@...r.kernel.org>
Subject: Re: [PATCH V5 4/6] arm64: dts: qcom: ipq9574: Add PCIe PHYs and
 controller nodes



On 5/14/2024 1:09 PM, Manivannan Sadhasivam wrote:
> On Sun, May 12, 2024 at 01:58:56PM +0530, devi priya wrote:
>> Add PCIe0, PCIe1, PCIe2, PCIe3 (and corresponding PHY) devices
>> found on IPQ9574 platform. The PCIe0 & PCIe1 are 1-lane Gen3
>> host whereas PCIe2 & PCIe3 are 2-lane Gen3 host.
>>
>> Signed-off-by: devi priya <quic_devipriy@...cinc.com>
>> ---
>>   Changes in V5:
>> 	- Dropped anoc and snoc lane clocks from Phy nodes and enabled them
>> 	  via interconnect.
>> 	- Dropped msi-parent as it is handled via msi IRQ
>>
>>   arch/arm64/boot/dts/qcom/ipq9574.dtsi | 365 +++++++++++++++++++++++++-
>>   1 file changed, 361 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/ipq9574.dtsi b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
>> index 5b3e69379b1f..da6418c9d52b 100644
>> --- a/arch/arm64/boot/dts/qcom/ipq9574.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> 
> [...]
> 
>> +		pcie1: pci@...00000 {
> 
> 'pcie@' since this is a PCIe controller.
okay
> 
>> +			compatible = "qcom,pcie-ipq9574";
>> +			reg =  <0x10000000 0xf1d>,
>> +			       <0x10000F20 0xa8>,
> 
> Please use lower case for hex everywhere.
okay
> 
>> +			       <0x10001000 0x1000>,
>> +			       <0x000F8000 0x4000>,
>> +			       <0x10100000 0x1000>;
>> +			reg-names = "dbi", "elbi", "atu", "parf", "config";
>> +			device_type = "pci";
>> +			linux,pci-domain = <2>;
>> +			bus-range = <0x00 0xff>;
>> +			num-lanes = <1>;
>> +			#address-cells = <3>;
>> +			#size-cells = <2>;
>> +
>> +			ranges = <0x01000000 0x0 0x00000000 0x10200000 0x0 0x100000>,  /* I/O */
>> +				 <0x02000000 0x0 0x10300000 0x10300000 0x0 0x7d00000>; /* MEM */
>> +
>> +			interrupts = <GIC_SPI 26 IRQ_TYPE_LEVEL_HIGH>;
>> +			interrupt-names = "msi";
> 
> Are you sure that this platform only has single MSI SPI IRQ?
It has 8 MSI SPI IRQs, will define all of them
> 
>> +			#interrupt-cells = <1>;
>> +			interrupt-map-mask = <0 0 0 0x7>;
>> +			interrupt-map = <0 0 0 1 &intc 0 0 35 IRQ_TYPE_LEVEL_HIGH>, /* int_a */
>> +					<0 0 0 2 &intc 0 0 49 IRQ_TYPE_LEVEL_HIGH>, /* int_b */
>> +					<0 0 0 3 &intc 0 0 84 IRQ_TYPE_LEVEL_HIGH>, /* int_c */
>> +					<0 0 0 4 &intc 0 0 85 IRQ_TYPE_LEVEL_HIGH>; /* int_d */
>> +
>> +			/* clocks and clock-names are used to enable the clock in CBCR */
> 
> This comment is redundant.
okay
> 
>> +			clocks = <&gcc GCC_PCIE1_AHB_CLK>,
>> +				 <&gcc GCC_PCIE1_AUX_CLK>,
>> +				 <&gcc GCC_PCIE1_AXI_M_CLK>,
>> +				 <&gcc GCC_PCIE1_AXI_S_CLK>,
>> +				 <&gcc GCC_PCIE1_AXI_S_BRIDGE_CLK>,
>> +				 <&gcc GCC_PCIE1_RCHNG_CLK>;
>> +			clock-names = "ahb",
>> +				      "aux",
>> +				      "axi_m",
>> +				      "axi_s",
>> +				      "axi_bridge",
>> +				      "rchng";
>> +
>> +			resets = <&gcc GCC_PCIE1_PIPE_ARES>,
>> +				 <&gcc GCC_PCIE1_CORE_STICKY_ARES>,
>> +				 <&gcc GCC_PCIE1_AXI_S_STICKY_ARES>,
>> +				 <&gcc GCC_PCIE1_AXI_S_ARES>,
>> +				 <&gcc GCC_PCIE1_AXI_M_STICKY_ARES>,
>> +				 <&gcc GCC_PCIE1_AXI_M_ARES>,
>> +				 <&gcc GCC_PCIE1_AUX_ARES>,
>> +				 <&gcc GCC_PCIE1_AHB_ARES>;
>> +			reset-names = "pipe",
>> +				      "sticky",
>> +				      "axi_s_sticky",
>> +				      "axi_s",
>> +				      "axi_m_sticky",
>> +				      "axi_m",
>> +				      "aux",
>> +				      "ahb";
>> +
>> +			phys = <&pcie1_phy>;
>> +			phy-names = "pciephy";
>> +			interconnects = <&gcc MASTER_ANOC_PCIE1 &gcc SLAVE_ANOC_PCIE1>,
>> +					<&gcc MASTER_SNOC_PCIE1 &gcc SLAVE_SNOC_PCIE1>;
> 
> Is this really the interconnect paths between PCIe-DDR and PCIe-CPU? I doubt...

We actually designed a minimalistic ICC driver for enabling the NoC 
clocks based on the suggestions received from the community.
Please find the link to the discussions that went in for introducing the 
ICC driver for NoC clock enablement

https://lore.kernel.org/linux-arm-msm/abd29b47-a8ab-4e2a-8147-d5d8ded98065@linaro.org/

Thanks,
Devi Priya
> 
> - Mani
>