linux-kernel - Re: [PATCH v2 17/21] dt-bindings: serial: document support for SA8255p

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Message-ID: <6fed4714-5239-473b-b4a0-886d83c459c3@quicinc.com>
Date: Wed, 4 Sep 2024 05:54:13 -0700
From: Nikunj Kela <quic_nkela@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: <andersson@...nel.org>, <konradybcio@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <rafael@...nel.org>,
        <viresh.kumar@...aro.org>, <herbert@...dor.apana.org.au>,
        <davem@...emloft.net>, <sudeep.holla@....com>, <andi.shyti@...nel.org>,
        <tglx@...utronix.de>, <will@...nel.org>, <robin.murphy@....com>,
        <joro@...tes.org>, <jassisinghbrar@...il.com>, <lee@...nel.org>,
        <linus.walleij@...aro.org>, <amitk@...nel.org>,
        <thara.gopinath@...il.com>, <broonie@...nel.org>,
        <cristian.marussi@....com>, <rui.zhang@...el.com>,
        <lukasz.luba@....com>, <wim@...ux-watchdog.org>, <linux@...ck-us.net>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        <linux-crypto@...r.kernel.org>, <arm-scmi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-i2c@...r.kernel.org>,
        <iommu@...ts.linux.dev>, <linux-gpio@...r.kernel.org>,
        <linux-serial@...r.kernel.org>, <linux-spi@...r.kernel.org>,
        <linux-watchdog@...r.kernel.org>, <kernel@...cinc.com>,
        <quic_psodagud@...cinc.com>, Praveen Talari <quic_ptalari@...cinc.com>
Subject: Re: [PATCH v2 17/21] dt-bindings: serial: document support for
 SA8255p


On 9/3/2024 11:36 PM, Krzysztof Kozlowski wrote:
> On Tue, Sep 03, 2024 at 03:02:36PM -0700, Nikunj Kela wrote:
>> Add compatibles representing UART support on SA8255p.
>>
>> Clocks and interconnects are being configured in the firmware VM
>> on SA8255p platform, therefore making them optional.
>>
>> CC: Praveen Talari <quic_ptalari@...cinc.com>
>> Signed-off-by: Nikunj Kela <quic_nkela@...cinc.com>
>> ---
>>  .../serial/qcom,serial-geni-qcom.yaml         | 53 ++++++++++++++++---
>>  1 file changed, 47 insertions(+), 6 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml
>> index dd33794b3534..b63c984684f3 100644
>> --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml
>> +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml
>> @@ -10,14 +10,13 @@ maintainers:
>>    - Andy Gross <agross@...nel.org>
>>    - Bjorn Andersson <bjorn.andersson@...aro.org>
>>  
>> -allOf:
>> -  - $ref: /schemas/serial/serial.yaml#
>> -
>>  properties:
>>    compatible:
>>      enum:
>>        - qcom,geni-uart
>>        - qcom,geni-debug-uart
>> +      - qcom,sa8255p-geni-uart
>> +      - qcom,sa8255p-geni-debug-uart
> Why devices are not compatible? What changed in programming model?

The cover-letter explains what is changed for devices in this platform.
I will add the description in this patch too.


>
>>  
>>    clocks:
>>      maxItems: 1
>> @@ -51,18 +50,49 @@ properties:
>>        - const: sleep
>>  
>>    power-domains:
>> -    maxItems: 1
>> +    minItems: 1
>> +    maxItems: 2
>> +
>> +  power-domain-names:
> This does not match power-domains anymore.

Single power domain doesn't need to use power-domain-names binding as it
is not needed however for multiple(in this case 2), you need to provide
names. I will add this property to if block and only keep maxItems here.


>
>> +    items:
>> +      - const: power
>> +      - const: perf
>>  
>>    reg:
>>      maxItems: 1
>>  
>>  required:
>>    - compatible
>> -  - clocks
>> -  - clock-names
>>    - interrupts
>>    - reg
>>  
>> +allOf:
>> +  - $ref: /schemas/serial/serial.yaml#
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            enum:
>> +              - qcom,sa8255p-geni-uart
>> +              - qcom,sa8255p-geni-debug-uart
>> +    then:
>> +      required:
>> +        - power-domains
>> +        - power-domain-names
>> +
>> +      properties:
>> +        power-domains:
>> +          minItems: 2
>> +
>> +    else:
>> +      required:
>> +        - clocks
>> +        - clock-names
>> +
>> +      properties:
>> +        power-domains:
>> +          maxItems: 1
>> +
>>  unevaluatedProperties: false
>>  
>>  examples:
>> @@ -83,4 +113,15 @@ examples:
>>                          <&gem_noc MASTER_APPSS_PROC 0 &config_noc SLAVE_QUP_0 0>;
>>          interconnect-names = "qup-core", "qup-config";
>>      };
>> +
>> +  - |
>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>> +
>> +    serial@...000 {
>> +        compatible = "qcom,sa8255p-geni-uart";
>> +        reg = <0x990000 0x4000>;
>> +        interrupts = <GIC_SPI 531 IRQ_TYPE_LEVEL_HIGH>;
>> +        power-domains = <&scmi11_pd 4>, <&scmi11_dvfs 4>;
>> +        power-domain-names = "power", "perf";
>> +    };
>>  ...
>> -- 
>> 2.34.1
>>