linux-kernel - Re: [PATCH V3 1/3] arm64: dts: sc7280: Add QSPI node

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Date:   Tue, 08 Jun 2021 13:37:22 +0530
From:   rojay@...eaurora.org
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     agross@...nel.org, robh+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        saiprakash.ranjan@...eaurora.org, msavaliy@....qualcomm.com
Subject: Re: [PATCH V3 1/3] arm64: dts: sc7280: Add QSPI node

On 2021-06-06 09:25, Bjorn Andersson wrote:
> On Fri 04 Jun 08:54 CDT 2021, Roja Rani Yarubandi wrote:
> 
>> Add QSPI DT node for SC7280 SoC.
>> 
>> Signed-off-by: Roja Rani Yarubandi <rojay@...eaurora.org>
>> ---
>> Changes in V3:
>>  - Broken the huge V2 patch into 3 smaller patches.
>>    1. QSPI DT nodes
>>    2. QUP wrapper_0 DT nodes
>>    3. QUP wrapper_1 DT nodes
>> 
>> Changes in V2:
>>  - As per Doug's comments removed pinmux/pinconf subnodes.
>>  - As per Doug's comments split of SPI, UART nodes has been done.
>>  - Moved QSPI node before aps_smmu as per the order.
>> 
>>  arch/arm64/boot/dts/qcom/sc7280-idp.dts | 29 ++++++++++++
>>  arch/arm64/boot/dts/qcom/sc7280.dtsi    | 61 
>> +++++++++++++++++++++++++
>>  2 files changed, 90 insertions(+)
>> 
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280-idp.dts 
>> b/arch/arm64/boot/dts/qcom/sc7280-idp.dts
>> index 3900cfc09562..d0edffc15736 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280-idp.dts
>> +++ b/arch/arm64/boot/dts/qcom/sc7280-idp.dts
>> @@ -268,6 +268,22 @@ pmr735b_die_temp {
>>  		};
>>  };
>> 
>> +&qspi {
>> +	status = "okay";
>> +	pinctrl-names = "default";
>> +	pinctrl-0 = <&qspi_clk>, <&qspi_cs0>, <&qspi_data01>;
>> +
>> +	flash@0 {
>> +		compatible = "jedec,spi-nor";
>> +		reg = <0>;
>> +
>> +		/* TODO: Increase frequency after testing */
>> +		spi-max-frequency = <25000000>;
>> +		spi-tx-bus-width = <2>;
>> +		spi-rx-bus-width = <2>;
>> +	};
>> +};
>> +
>>  &qupv3_id_0 {
>>  	status = "okay";
>>  };
>> @@ -278,6 +294,19 @@ &uart5 {
>> 
>>  /* PINCTRL - additions to nodes defined in sc7280.dtsi */
>> 
>> +&qspi_cs0 {
>> +	bias-disable;
>> +};
>> +
>> +&qspi_clk {
>> +	bias-disable;
>> +};
>> +
>> +&qspi_data01 {
>> +	/* High-Z when no transfers; nice to park the lines */
>> +	bias-pull-up;
>> +};
>> +
>>  &qup_uart5_default {
>>  	tx {
>>  		pins = "gpio46";
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi 
>> b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> index 6c9d5eb93f93..3047ab802cd2 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> @@ -1061,6 +1061,42 @@ apss_merge_funnel_in: endpoint {
>>  			};
>>  		};
>> 
>> +		qspi_opp_table: qspi-opp-table {
> 
> This node doesn't represents anything on the mmio bus, so it shouldn't
> live in in /soc. Can't you move it into &qspi?
> 
> Regards,
> Bjorn
> 

Sure, will move it into qspi node.

Thanks,
Roja

>> +			compatible = "operating-points-v2";
>> +
>> +			opp-75000000 {
>> +				opp-hz = /bits/ 64 <75000000>;
>> +				required-opps = <&rpmhpd_opp_low_svs>;
>> +			};
>> +
>> +			opp-150000000 {
>> +				opp-hz = /bits/ 64 <150000000>;
>> +				required-opps = <&rpmhpd_opp_svs>;
>> +			};
>> +
>> +			opp-300000000 {
>> +				opp-hz = /bits/ 64 <300000000>;
>> +				required-opps = <&rpmhpd_opp_nom>;
>> +			};
>> +		};
>> +
>> +		qspi: spi@...c000 {
>> +			compatible = "qcom,qspi-v1";
>> +			reg = <0 0x088dc000 0 0x1000>;
>> +			#address-cells = <1>;
>> +			#size-cells = <0>;
>> +			interrupts = <GIC_SPI 82 IRQ_TYPE_LEVEL_HIGH>;
>> +			clocks = <&gcc GCC_QSPI_CNOC_PERIPH_AHB_CLK>,
>> +				 <&gcc GCC_QSPI_CORE_CLK>;
>> +			clock-names = "iface", "core";
>> +			interconnects = <&gem_noc MASTER_APPSS_PROC 0
>> +					&cnoc2 SLAVE_QSPI_0 0>;
>> +			interconnect-names = "qspi-config";
>> +			power-domains = <&rpmhpd SC7280_CX>;
>> +			operating-points-v2 = <&qspi_opp_table>;
>> +			status = "disabled";
>> +		};