linux-kernel - Re: [PATCH v12 3/8] arm64: dts: ti: k3-j721s2-mcu-wakeup: Add support of OSPI

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Message-ID: <7843adf0-f883-280b-1d87-44010ceef767@ti.com>
Date:   Thu, 2 Mar 2023 09:03:09 +0530
From:   Ravi Gunasekaran <r-gunasekaran@...com>
To:     Andrew Davis <afd@...com>, <nm@...com>, <vigneshr@...com>,
        <kristo@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <s-vadapalli@...com>,
        <vaishnav.a@...com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v12 3/8] arm64: dts: ti: k3-j721s2-mcu-wakeup: Add support
 of OSPI



On 01/03/23 9:27 pm, Andrew Davis wrote:
> On 3/1/23 3:11 AM, Ravi Gunasekaran wrote:
>> From: Aswath Govindraju <a-govindraju@...com>
>>
>> Add support for two instance of OSPI in J721S2 SoC.
>>
>> Reviewed-by: Vaishnav Achath <vaishnav.a@...com>
>> Signed-off-by: Aswath Govindraju <a-govindraju@...com>
>> Signed-off-by: Matt Ranostay <mranostay@...com>
>> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@...com>
>> ---
>> Changes from v11:
>> * Cleaned up comments
>>
>> Changes from v10:
>> * Documented the reason for disabling the nodes by default.
>> * Removed Link tag from commmit message
>>
>> Changes from v9:
>> * Disabled fss, ospi nodes by default in common DT file
>>
>> Changes from v8:
>> * Updated "ranges" property to fix dtbs warnings
>>
>> Changes from v7:
>> * Removed "reg" property from syscon node
>> * Renamed the "syscon" node to "bus" to after change in
>>    compatible property
>>
>> Changes from v6:
>> * Fixed the syscon node's compatible property
>>
>> Changes from v5:
>> * Updated the syscon node's compatible property
>> * Removed Cc tags from commit message
>>
>> Changes from v4:
>> * No change
>>
>> Changes from v3:
>> * No change
>>
>> Changes from v2:
>> * No change
>>
>> Changes from v1:
>> * No change
>>
>>   .../boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi     | 46 +++++++++++++++++++
>>   1 file changed, 46 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
>> index 0af242aa9816..ab3ce8be7216 100644
>> --- a/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
>> +++ b/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
>> @@ -306,4 +306,50 @@
>>               ti,cpts-periodic-outputs = <2>;
>>           };
>>       };
>> +
>> +    fss: bus@...00000 {
>> +        compatible = "simple-bus";
>> +        #address-cells = <2>;
>> +        #size-cells = <2>;
>> +        ranges = <0x00 0x47000000 0x00 0x47000000 0x00 0x00068400>,
>> +             <0x05 0x00000000 0x05 0x00000000 0x01 0x00000000>,
>> +             <0x07 0x00000000 0x07 0x00000000 0x01 0x00000000>;
>> +
>> +        status = "disabled";
> 
> Since this node doesn't need pinmux, why is it default disabled? Same for
> the other parent nodes in this series.
> 
> Andrew

In this patch and others in this series, since child node is disabled,
I thought of disabling the parent as well. And to later enable the
parent node at the time when the child node needs to be enabled.

> 
>> +
>> +        ospi0: spi@...40000 {
>> +            compatible = "ti,am654-ospi", "cdns,qspi-nor";
>> +            reg = <0x00 0x47040000 0x00 0x100>,
>> +                  <0x05 0x00000000 0x01 0x00000000>;
>> +            interrupts = <GIC_SPI 840 IRQ_TYPE_LEVEL_HIGH>;
>> +            cdns,fifo-depth = <256>;
>> +            cdns,fifo-width = <4>;
>> +            cdns,trigger-address = <0x0>;
>> +            clocks = <&k3_clks 109 5>;
>> +            assigned-clocks = <&k3_clks 109 5>;
>> +            assigned-clock-parents = <&k3_clks 109 7>;
>> +            assigned-clock-rates = <166666666>;
>> +            power-domains = <&k3_pds 109 TI_SCI_PD_EXCLUSIVE>;
>> +            #address-cells = <1>;
>> +            #size-cells = <0>;
>> +
>> +            status = "disabled"; /* Needs pinmux */
>> +        };
>> +
>> +        ospi1: spi@...50000 {
>> +            compatible = "ti,am654-ospi", "cdns,qspi-nor";
>> +            reg = <0x00 0x47050000 0x00 0x100>,
>> +                  <0x07 0x00000000 0x01 0x00000000>;
>> +            interrupts = <GIC_SPI 841 IRQ_TYPE_LEVEL_HIGH>;
>> +            cdns,fifo-depth = <256>;
>> +            cdns,fifo-width = <4>;
>> +            cdns,trigger-address = <0x0>;
>> +            clocks = <&k3_clks 110 5>;
>> +            power-domains = <&k3_pds 110 TI_SCI_PD_EXCLUSIVE>;
>> +            #address-cells = <1>;
>> +            #size-cells = <0>;
>> +
>> +            status = "disabled"; /* Needs pinmux */
>> +        };
>> +    };
>>   };

-- 
Regards,
Ravi