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

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Message-ID: <jzpx66l4tesnyszmpc3nt5h7mezbvdhtcbls5rbwlmpveb6d6y@i3jf7jsajjjd>
Date: Wed, 4 Sep 2024 08:36:01 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Nikunj Kela <quic_nkela@...cinc.com>
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 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?

>  
>    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.

> +    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
>