linux-kernel - Re: [PATCH 1/2] arm64: dts: NS2: Add all of the UARTs

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Date:	Thu, 12 May 2016 14:16:46 +0800
From:	Kefeng Wang <wangkefeng.wang@...wei.com>
To:	Jon Mason <jon.mason@...adcom.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Catalin Marinas" <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>
CC:	<bcm-kernel-feedback-list@...adcom.com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] arm64: dts: NS2: Add all of the UARTs



On 2016/5/12 6:56, Jon Mason wrote:
> Add all of the UARTs present on NS2 and enable them in the SVK device
> tree file.  Also, do some magic to make sure that uart3 is discovered as
> ttyS0 (as that is the console UART).
> 
> Signed-off-by: Jon Mason <jonmason@...adcom.com>
> ---
>  arch/arm64/boot/dts/broadcom/ns2-svk.dts | 16 ++++++++++++++++
>  arch/arm64/boot/dts/broadcom/ns2.dtsi    | 30 ++++++++++++++++++++++++++++++
>  2 files changed, 46 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/broadcom/ns2-svk.dts b/arch/arm64/boot/dts/broadcom/ns2-svk.dts
> index 7cd3640..b062a44 100644
> --- a/arch/arm64/boot/dts/broadcom/ns2-svk.dts
> +++ b/arch/arm64/boot/dts/broadcom/ns2-svk.dts
> @@ -40,10 +40,14 @@
>  
>  	aliases {
>  		serial0 = &uart3;
> +		serial1 = &uart0;
> +		serial2 = &uart1;
> +		serial3 = &uart2;
>  	};
>  
>  	chosen {
>  		stdout-path = "serial0:115200n8";
> +		bootargs = "earlycon=uart8250,mmio32,0x66130000";

Hi Jon,

I submit a patch[1], with it, we can use earlycon without option to enable early console
for "snps,dw-apb-uart", could you help me to test it, thanks.

BRs,
Kefeng


[1] https://lkml.org/lkml/2016/5/11/34

>  	};
>  
>  	memory {
> @@ -68,6 +72,18 @@
>  	status = "ok";
>  };
>  
> +&uart0 {
> +	status = "ok";
> +};
> +
> +&uart1 {
> +	status = "ok";
> +};
> +
> +&uart2 {
> +	status = "ok";
> +};
> +
>  &uart3 {
>  	status = "ok";
>  };
> diff --git a/arch/arm64/boot/dts/broadcom/ns2.dtsi b/arch/arm64/boot/dts/broadcom/ns2.dtsi
> index 788ed8f..c77a9e8 100644
> --- a/arch/arm64/boot/dts/broadcom/ns2.dtsi
> +++ b/arch/arm64/boot/dts/broadcom/ns2.dtsi
> @@ -357,6 +357,36 @@
>  			status = "disabled";
>  		};
>  
> +		uart0: serial@...00000 {
> +			compatible = "snps,dw-apb-uart";
> +			reg = <0x66100000 0x100>;
> +			interrupts = <GIC_SPI 390 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&iprocslow>;
> +			reg-shift = <2>;
> +			reg-io-width = <4>;
> +			status = "disabled";
> +		};
> +
> +		uart1: serial@...10000 {
> +			compatible = "snps,dw-apb-uart";
> +			reg = <0x66110000 0x100>;
> +			interrupts = <GIC_SPI 391 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&iprocslow>;
> +			reg-shift = <2>;
> +			reg-io-width = <4>;
> +			status = "disabled";
> +		};
> +
> +		uart2: serial@...20000 {
> +			compatible = "snps,dw-apb-uart";
> +			reg = <0x66120000 0x100>;
> +			interrupts = <GIC_SPI 392 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&iprocslow>;
> +			reg-shift = <2>;
> +			reg-io-width = <4>;
> +			status = "disabled";
> +		};
> +
>  		uart3: serial@...30000 {
>  			compatible = "snps,dw-apb-uart";
>  			reg = <0x66130000 0x100>;
>