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Date:	Mon, 16 May 2016 09:11:33 +0800
From:	Kefeng Wang <wangkefeng.wang@...wei.com>
To:	Jon Mason <jon.mason@...adcom.com>
CC:	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>,
	BCM Kernel Feedback <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 2016/5/14 0:49, Jon Mason wrote:
> 
> 
> On Thu, May 12, 2016 at 10:09 PM, Kefeng Wang <wangkefeng.wang@...wei.com <mailto:wangkefeng.wang@...wei.com>> wrote:
> 
> 
> 
>     On 2016/5/12 22:46, Jon Mason wrote:
>     >
>     >
>     > On Thu, May 12, 2016 at 2:16 AM, Kefeng Wang <wangkefeng.wang@...wei.com <mailto:wangkefeng.wang@...wei.com> <mailto:wangkefeng.wang@...wei.com <mailto:wangkefeng.wang@...wei.com>>> wrote:
>     >
>     >
>     >
>     >     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 <mailto:jonmason@...adcom.com> <mailto:jonmason@...adcom.com <mailto: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.
>     >
>     >
>     > Adding your change and removing the line above does not cause earlycon to work for me.  Is there any additional changes necessary for this to work?
>     With my patch, the bootargs still need contain earlycon, but no need uart8250,mmio32,0x66130000;
> 
>     chosen {
>             stdout-path = "serial0:115200n8";
>             bootargs = "earlycon";
>     }
> 
>     Hope it would work.
> 
> 
> I can confirm that with your change and the change to the bootargs you describe above, it works as desired.  Was your change already accepted?
> 

Great, thanks a lot. it is still being reviewing for now and waiting for response for now.

BRs,
Kefeng

> Thanks,
> Jon
>  
> 
> 
>     BRs,
>     Kefeng
> 
>     >
>     > Thanks,
>     > Jon
>     >
>     >
>     >
>     >     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>;
>     >     >
>     >
>     >
> 
> 

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