linux-kernel - Re: [PATCH 4/4] arm64: dts: sprd: Add support for Unisoc's UMS9620

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Date: Fri, 15 Dec 2023 11:36:25 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Chunyan Zhang <chunyan.zhang@...soc.com>, Rob Herring
 <robh+dt@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 Lee Jones <lee@...nel.org>
Cc: devicetree@...r.kernel.org, linux-serial@...r.kernel.org,
 Baolin Wang <baolin.wang@...ux.alibaba.com>, Orson Zhai
 <orsonzhai@...il.com>, Chunyan Zhang <zhang.lyra@...il.com>,
 LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] arm64: dts: sprd: Add support for Unisoc's UMS9620

On 15/12/2023 09:56, Chunyan Zhang wrote:
> Add basic support for Unisoc's UMS9620, with this patch,
> the board ums9620-2h10 can run into console.
> 

...

> +
> +	soc: soc {

Are you sure you do not have here W=1 warnings?

> +		compatible = "simple-bus";
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		gic: interrupt-controller@...00000 {
> +			compatible = "arm,gic-v3";
> +			reg = <0x0 0x12000000 0 0x20000>,	/* GICD */
> +			      <0x0 0x12040000 0 0x100000>;	/* GICR */
> +			#interrupt-cells = <3>;
> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +			ranges;

Put ranges after reg, if they are needed. Are they needed, BTW?

> +			redistributor-stride = <0x0 0x20000>;	/* 128KB stride */
> +			#redistributor-regions = <1>;
> +			interrupt-controller;
> +			interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;
> +		};
> +
> +		apb@...00000 {
> +			compatible = "simple-bus";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges = <0 0 0x20200000 0x100000>;

ranges is after reg, which is after compatible, so here it is the second
property.

> +
> +			uart0: serial@0 {
> +				compatible = "sprd,ums9620-uart",
> +					     "sprd,sc9836-uart";
> +				reg = <0 0x100>;
> +				interrupts = <GIC_SPI 196 IRQ_TYPE_LEVEL_HIGH>;
> +				clocks = <&ext_26m>;
> +				status = "disabled";
> +			};
> +
> +			uart1: serial@...00 {
> +				compatible = "sprd,ums9620-uart",
> +					     "sprd,sc9836-uart";
> +				reg = <0x10000 0x100>;
> +				interrupts = <GIC_SPI 195 IRQ_TYPE_LEVEL_HIGH>;
> +				clocks = <&ext_26m>;
> +				status = "disabled";
> +			};
> +		};
> +	};


Best regards,
Krzysztof