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

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Date:   Wed, 14 Jul 2021 13:17:33 +0530
From:   rojay@...eaurora.org
To:     Stephen Boyd <swboyd@...omium.org>, robh+dt@...nel.org
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>, agross@...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,
        rajpat@...eaurora.org
Subject: Re: [PATCH V3 1/3] arm64: dts: sc7280: Add QSPI node

On 2021-07-09 06:26, Stephen Boyd wrote:
> Quoting rojay@...eaurora.org (2021-07-06 02:19:27)
>> 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
> 
> If DT folks are OK I think we should hard-code 'opp-table' as not a
> device for spi to populate on the spi bus and relax the warning in the
> devicetree compiler (see [1] for more details). Technically, nodes that
> are bus controllers assume all child nodes are devices on that bus.  In
> this case, we want to stick the opp table as a child of the spi node so
> that it can be called 'opp-table' and not be a node in the root of DT.
> 
>> 
>> Shall I keep the qspi-opp-table out of &qspi node?
>> 
> 
> If you do, please move it to / instead of putting it under /soc as it
> doesn't have an address or a reg property.
> 

Hi Bjorn, Rob

Can we move this "qspi_opp_table" to / from /soc?

Thanks,
Roja

> [1]
> https://github.com/dgibson/dtc/blob/69595a167f06c4482ce784e30df1ac9b16ceb5b0/checks.c#L1844