Subject: [PATCH 1/2] arm64: dts: NS2: Add all of the UARTs

From: [email-masked] (Kefeng Wang)
Date: Fri, 13 May 2016 10:09:37 +0800

On 2016/5/12 22:46, Jon Mason wrote:
> 
> 
> On Thu, May 12, 2016 at 2:16 AM, Kefeng Wang <wangkefeng.wang at huawei.com <mailto:[email-masked]>> 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 at broadcom.com <mailto:[email-masked]>>
>     > ---
>     >  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.

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 at 66100000 {
>     > +                     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 at 66110000 {
>     > +                     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 at 66120000 {
>     > +                     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 at 66130000 {
>     >                       compatible = "snps,dw-apb-uart";
>     >                       reg = <0x66130000 0x100>;
>     >
> 
>