On 2016/5/12 22:46, Jon Mason wrote:
>
>
> On Thu, May 12, 2016 at 2:16 AM, Kefeng Wang <wangkefeng.w...@huawei.com
> <mailto:wangkefeng.w...@huawei.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 <jonma...@broadcom.com
> <mailto:jonma...@broadcom.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.
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@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@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@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@66130000 {
> > compatible = "snps,dw-apb-uart";
> > reg = <0x66130000 0x100>;
> >
>
>
