Re: [PATCH v2 2/4] arm64: dts: qcom: sc7280: Add PCIe and PHY related nodes

[Prasad Malisetty <pmaliset@codeaurora.org>]

On 2021-06-06 07:56, Bjorn Andersson wrote:
> On Sat 05 Jun 09:40 CDT 2021, Prasad Malisetty wrote:
> 
>> Add PCIe controller and PHY nodes for sc7280 SOC.
>> 
>> Signed-off-by: Prasad Malisetty <pmaliset@codeaurora.org>
>> ---
>>  arch/arm64/boot/dts/qcom/sc7280.dtsi | 138 
>> +++++++++++++++++++++++++++++++++++
>>  1 file changed, 138 insertions(+)
>> 
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi 
>> b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> index 0b6f119..9e8414d 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> @@ -15,6 +15,7 @@
>>  #include <dt-bindings/reset/qcom,sdm845-pdc.h>
>>  #include <dt-bindings/soc/qcom,rpmh-rsc.h>
>>  #include <dt-bindings/thermal/thermal.h>
>> +#include <dt-bindings/gpio/gpio.h>
>> 
>>  / {
>>  	interrupt-parent = <&intc>;
>> @@ -484,6 +485,117 @@
>>  			#power-domain-cells = <1>;
>>  		};
>> 
>> +		pcie1: pci@1c08000 {
> 
> Does this name imply that you have a pcie0 as well? Please introduce it
> while you're at it.
> 
>> We are not using pcie0 for HLOS.

>> +			compatible = "qcom,pcie-sc7280", "qcom,pcie-sm8250", 
>> "snps,dw-pcie";
>> +			reg = <0 0x01c08000 0 0x3000>,
>> +			      <0 0x40000000 0 0xf1d>,
>> +			      <0 0x40000f20 0 0xa8>,
>> +			      <0 0x40001000 0 0x1000>,
>> +			      <0 0x40100000 0 0x100000>;
>> +
>> +			reg-names = "parf", "dbi", "elbi", "atu", "config";
>> +			device_type = "pci";
>> +			linux,pci-domain = <1>;
>> +			bus-range = <0x00 0xff>;
>> +			num-lanes = <2>;
>> +
>> +			#address-cells = <3>;
>> +			#size-cells = <2>;
>> +
>> +			ranges = <0x01000000 0x0 0x40200000 0x0 0x40200000 0x0 0x100000>,
>> +				 <0x02000000 0x0 0x40300000 0x0 0x40300000 0x0 0x1fd00000>;
>> +
>> +			interrupts = <GIC_SPI 307 IRQ_TYPE_LEVEL_HIGH>;
>> +			interrupt-names = "msi";
>> +			#interrupt-cells = <1>;
>> +			interrupt-map-mask = <0 0 0 0x7>;
>> +			interrupt-map = <0 0 0 1 &intc 0 434 IRQ_TYPE_LEVEL_HIGH>, /* 
>> int_a */
>> +					<0 0 0 2 &intc 0 435 IRQ_TYPE_LEVEL_HIGH>, /* int_b */
>> +					<0 0 0 3 &intc 0 438 IRQ_TYPE_LEVEL_HIGH>, /* int_c */
>> +					<0 0 0 4 &intc 0 439 IRQ_TYPE_LEVEL_HIGH>; /* int_d */
>> +
>> +			clocks = <&gcc GCC_PCIE_1_PIPE_CLK>,
>> +				 <&gcc GCC_PCIE_1_PIPE_CLK_SRC>,
>> +				 <&pcie1_lane 0>,
>> +				 <&rpmhcc RPMH_CXO_CLK>,
>> +				 <&gcc GCC_PCIE_1_AUX_CLK>,
>> +				 <&gcc GCC_PCIE_1_CFG_AHB_CLK>,
>> +				 <&gcc GCC_PCIE_1_MSTR_AXI_CLK>,
>> +				 <&gcc GCC_PCIE_1_SLV_AXI_CLK>,
>> +				 <&gcc GCC_PCIE_1_SLV_Q2A_AXI_CLK>,
>> +				 <&gcc GCC_AGGRE_NOC_PCIE_TBU_CLK>,
>> +				 <&gcc GCC_DDRSS_PCIE_SF_CLK>;
>> +
>> +			clock-names = "pipe",
>> +				      "pipe_src",
>> +				      "pipe_ext",
>> +				      "ref",
>> +				      "aux",
>> +				      "cfg",
>> +				      "bus_master",
>> +				      "bus_slave",
>> +				      "slave_q2a",
>> +				      "tbu",
>> +				      "ddrss_sf_tbu";
>> +
>> +			assigned-clocks = <&gcc GCC_PCIE_1_AUX_CLK>;
>> +			assigned-clock-rates = <19200000>;
>> +
>> +			resets = <&gcc GCC_PCIE_1_BCR>;
>> +			reset-names = "pci";
>> +
>> +			power-domains = <&gcc GCC_PCIE_1_GDSC>;
>> +
>> +			phys = <&pcie1_lane>;
>> +			phy-names = "pciephy";
>> +
>> +			perst-gpio = <&tlmm 2 GPIO_ACTIVE_LOW>;
>> +			pinctrl-names = "default";
>> +			pinctrl-0 = <&pcie1_default_state>;
>> +
>> +			iommus = <&apps_smmu 0x1c80 0x1>;
>> +
>> +			iommu-map = <0x0 &apps_smmu 0x1c80 0x1>,
>> +				    <0x100 &apps_smmu 0x1c81 0x1>;
>> +
>> +			status = "disabled";
>> +		};
>> +
>> +		pcie1_phy: phy@1c0e000 {
>> +			compatible = "qcom,sm8250-qmp-gen3x2-pcie-phy";
> 
> No, you don't have a sm8250-qmp-gen3x2-pcie-phy in your sc7280.
> 
>> Both are having same PHY sequence.

>> +			status = "disabled";
>> +			reg = <0 0x01c0e000 0 0x1c0>;
>> +			#address-cells = <2>;
>> +			#size-cells = <2>;
>> +			ranges;
>> +			clocks = <&gcc GCC_PCIE_1_AUX_CLK>,
>> +				 <&gcc GCC_PCIE_1_CFG_AHB_CLK>,
>> +				 <&gcc GCC_PCIE_CLKREF_EN>,
>> +				 <&gcc GCC_PCIE1_PHY_RCHNG_CLK>;
>> +			clock-names = "aux", "cfg_ahb", "ref", "refgen";
>> +
>> +			resets = <&gcc GCC_PCIE_1_PHY_BCR>;
>> +			reset-names = "phy";
>> +
>> +			assigned-clocks = <&gcc GCC_PCIE1_PHY_RCHNG_CLK>;
>> +			assigned-clock-rates = <100000000>;
>> +
>> +			pcie1_lane: lanes@1c0e200 {
>> +				reg = <0 0x01c0e200 0 0x170>,
>> +				      <0 0x01c0e400 0 0x200>,
>> +				      <0 0x01c0ea00 0 0x1f0>,
>> +				      <0 0x01c0e600 0 0x170>,
>> +				      <0 0x01c0e800 0 0x200>,
>> +				      <0 0x01c0ee00 0 0xf4>;
>> +				clocks = <&rpmhcc RPMH_CXO_CLK>;
>> +				clock-names = "pipe0";
>> +
>> +				#phy-cells = <0>;
>> +				#clock-cells = <1>;
>> +				clock-output-names = "pcie_1_pipe_clk";
>> +			};
>> +		};
>> +
>>  		stm@6002000 {
>>  			compatible = "arm,coresight-stm", "arm,primecell";
>>  			reg = <0 0x06002000 0 0x1000>,
>> @@ -1102,6 +1214,32 @@
>>  				pins = "gpio46", "gpio47";
>>  				function = "qup13";
>>  			};
>> +
>> +			pcie1_default_state: pcie1-default {
> 
> Per the binding the name has to end with "-pins", although I would like
> us to change that to "-state". Either way, this is not correct.
> 
>> +				clkreq {
>> +					pins = "gpio79";
>> +					function = "pcie1_clkreqn";
>> +				};
>> +
>> +				reset-n {
>> +					pins = "gpio2";
>> +					function = "gpio";
>> +
>> +					drive-strength = <16>;
>> +					output-low;
>> +					bias-disable;
>> +				};
>> +
>> +				wake-n {
>> +					pins = "gpio3";
>> +					function = "gpio";
>> +				};
>> +
>> +				nvme-n {
> 
> This doesn't look like a standard PCIe pin, is it perhaps the enable 
> pin
> for the regulator powering your NVME, or something along those lines?
> 
> If so you should describe it as a fixed-regulator...and either way I
> suspect it should be moved to the device specific file.
> 
> Regards,
> Bjorn
> 
> Agree, will move into board specific file.

>> +					pins = "gpio19";
>> +					function = "gpio";
>> +				};
>> +			};
>>  		};
>> 
>>  		apps_smmu: iommu@15000000 {
>> --
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>> Forum,
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