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

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Date:   Tue, 06 Jul 2021 14:49:27 +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 2021-06-08 13:37, rojay@...eaurora.org wrote:
> 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
> 

Hi Bjorn,

Moving "qspi_opp_table" inside &qspi node causing this warning:
arch/arm64/boot/dts/qcom/sc7280.dtsi:1055.35-1072.6: Warning 
(spi_bus_reg): /soc@...pi@...c000/qspi-opp-table: missing or empty reg 
property

Shall I keep the qspi-opp-table out of &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";
>>> +		};