Re: [PATCH v2 2/2] arm64: dts: Add Mediatek SoC MT2712 and evaluation board dts and Makefile

From: YT Shen
Date: Fri Jun 09 2017 - 09:41:19 EST

On Wed, 2017-05-31 at 13:38 +0100, Marc Zyngier wrote:
> On 31/05/17 12:39, YT Shen wrote:
> > This adds basic chip support for Mediatek 2712
> >
> > Signed-off-by: YT Shen <yt.shen@xxxxxxxxxxxx>
> > ---
> > arch/arm64/boot/dts/mediatek/Makefile | 1 +
> > arch/arm64/boot/dts/mediatek/mt2712-evb.dts | 39 +++++++
> > arch/arm64/boot/dts/mediatek/mt2712e.dtsi | 166 ++++++++++++++++++++++++++++
> > 3 files changed, 206 insertions(+)
> > create mode 100644 arch/arm64/boot/dts/mediatek/mt2712-evb.dts
> > create mode 100644 arch/arm64/boot/dts/mediatek/mt2712e.dtsi
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dts/mediatek/Makefile
> > index 9fbfd32..fcc0604 100644
> > --- a/arch/arm64/boot/dts/mediatek/Makefile
> > +++ b/arch/arm64/boot/dts/mediatek/Makefile
> > @@ -1,3 +1,4 @@
> > +dtb-$(CONFIG_ARCH_MEDIATEK) += mt2712-evb.dtb
> > dtb-$(CONFIG_ARCH_MEDIATEK) += mt6755-evb.dtb
> > dtb-$(CONFIG_ARCH_MEDIATEK) += mt6795-evb.dtb
> > dtb-$(CONFIG_ARCH_MEDIATEK) += mt8173-evb.dtb
> > diff --git a/arch/arm64/boot/dts/mediatek/mt2712-evb.dts b/arch/arm64/boot/dts/mediatek/mt2712-evb.dts
> > new file mode 100644
> > index 0000000..e526c0f
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt2712-evb.dts
> > @@ -0,0 +1,39 @@
> > +/*
> > + * Copyright (c) 2017 MediaTek Inc.
> > + * Author: YT Shen <yt.shen@xxxxxxxxxxxx>
> > + *
> > + * SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > + */
> > +
> > +/dts-v1/;
> > +#include "mt2712e.dtsi"
> > +
> > +/ {
> > + model = "MediaTek MT2712 evaluation board";
> > + compatible = "mediatek,mt2712-evb", "mediatek,mt2712";
> > +
> > + aliases {
> > + serial0 = &uart0;
> > + serial1 = &uart1;
> > + serial2 = &uart2;
> > + serial3 = &uart3;
> > + serial4 = &uart4;
> > + serial5 = &uart5;
> > + };
> > +
> > + memory@40000000 {
> > + device_type = "memory";
> > + reg = <0 0x40000000 0 0x80000000>;
> > + };
> > +
> > + chosen {
> > + stdout-path = "serial0:921600n8";
> > + linux,initrd-start = <0x45000000>;
> > + linux,initrd-end = <0x4a000000>;
> > + };
> > +};
> > +
> > +&uart0 {
> > + status = "okay";
> > +};
> > +
> > diff --git a/arch/arm64/boot/dts/mediatek/mt2712e.dtsi b/arch/arm64/boot/dts/mediatek/mt2712e.dtsi
> > new file mode 100644
> > index 0000000..6df0da9
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt2712e.dtsi
> > @@ -0,0 +1,166 @@
> > +/*
> > + * Copyright (c) 2017 MediaTek Inc.
> > + * Author: YT Shen <yt.shen@xxxxxxxxxxxx>
> > + *
> > + * SPDX-License-Identifier: (GPL-2.0 OR MIT)
> > + */
> > +
> > +#include <dt-bindings/interrupt-controller/irq.h>
> > +#include <dt-bindings/interrupt-controller/arm-gic.h>
> > +
> > +/ {
> > + compatible = "mediatek,mt2712";
> > + interrupt-parent = <&sysirq>;
> > + #address-cells = <2>;
> > + #size-cells = <2>;
> > +
> > + cpus {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + cpu-map {
> > + cluster0 {
> > + core0 {
> > + cpu = <&cpu0>;
> > + };
> > + core1 {
> > + cpu = <&cpu1>;
> > + };
> > + };
> > +
> > + cluster1 {
> > + core0 {
> > + cpu = <&cpu2>;
> > + };
> > + };
> > + };
> > +
> > + cpu0: cpu@0 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a35";
> > + reg = <0x000>;
> > + };
> > +
> > + cpu1: cpu@1 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a35";
> > + reg = <0x001>;
> > + enable-method = "psci";
> > + };
> > +
> > + cpu2: cpu@200 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a72";
> > + reg = <0x200>;
> > + enable-method = "psci";
> > + };
> > + };
> > +
> > + psci {
> > + compatible = "arm,psci-0.2";
> > + method = "smc";
> > + };
> > +
> > + uart_clk: dummy26m {
> > + compatible = "fixed-clock";
> > + clock-frequency = <26000000>;
> > + #clock-cells = <0>;
> > + };
> > +
> > + timer {
> > + compatible = "arm,armv8-timer";
> > + interrupt-parent = <&gic>;
> > + interrupts = <GIC_PPI 13
> > + (GIC_CPU_MASK_SIMPLE(6) | IRQ_TYPE_LEVEL_LOW)>,
>
> Why 6? I only count 3 cores...
OK, will change to GIC_CPU_MASK_RAW(0x13)

Sorry for the late reply.
>
> > + <GIC_PPI 14
> > + (GIC_CPU_MASK_SIMPLE(6) | IRQ_TYPE_LEVEL_LOW)>,
> > + <GIC_PPI 11
> > + (GIC_CPU_MASK_SIMPLE(6) | IRQ_TYPE_LEVEL_LOW)>,
> > + <GIC_PPI 10
> > + (GIC_CPU_MASK_SIMPLE(6) | IRQ_TYPE_LEVEL_LOW)>;
> > + };
> > +
> > + soc {
> > + #address-cells = <2>;
> > + #size-cells = <2>;
> > + compatible = "simple-bus";
> > + ranges;
> > +
> > + uart5: serial@1000f000 {
> > + compatible = "mediatek,mt2712-uart",
> > + "mediatek,mt6577-uart";
> > + reg = <0 0x1000f000 0 0x400>;
> > + interrupts = <GIC_SPI 127 IRQ_TYPE_LEVEL_LOW>;
> > + clocks = <&uart_clk>;
> > + status = "disabled";
> > + };
> > +
> > + sysirq: interrupt-controller@10220a80 {
> > + compatible = "mediatek,mt2712-sysirq",
> > + "mediatek,mt6577-sysirq";
> > + interrupt-controller;
> > + #interrupt-cells = <3>;
> > + interrupt-parent = <&gic>;
> > + reg = <0 0x10220a80 0 0x40>;
> > + };
> > +
> > + gic: interrupt-controller@10510000 {
> > + compatible = "arm,gic-400";
> > + #interrupt-cells = <3>;
> > + interrupt-parent = <&gic>;
> > + interrupt-controller;
> > + reg = <0 0x10510000 0 0x1000>,
> > + <0 0x10520000 0 0x1000>,
>
> If that's truly a GIC400, then the above is wrong (the CPU interface is
> spread over 8kB).
>
> I also suspect that the first 4kB are aliased over
> 0x10520000:0x1052f000, and the second over 0x10530000:0x1053f000 (in the
> true SBSA tradition). If that's the case, then the size is actually 128kB.
The chip information at hand is not enough for me to answer this
question, if I have further document will check this part.

>
> > + <0 0x10540000 0 0x2000>,
> > + <0 0x10560000 0 0x2000>;
>
> Please check GICV as well, which probably behaves the same way.
The reg entry I changed to
reg = <0 0x10510000 0 0x1000>,
<0 0x10520000 0 0x20000>,
<0 0x10540000 0 0x20000>,
<0 0x10560000 0 0x20000>;
is that correct?

The platform boot to shell successfully. The boot message shows
additional different two lines:
...
[ 0.000000] GIC: Adjusting CPU interface base to 0x000000001052f000
[ 0.000000] GIC: Using split EOI/Deactivate mode
...

>
> > + interrupts = <GIC_PPI 9
> > + (GIC_CPU_MASK_SIMPLE(6) | IRQ_TYPE_LEVEL_HIGH)>;
>
> Same thing here with 6 CPUs.
Will change to GIC_CPU_MASK_RAW(0x13)

>
> > + };
> > +
> > + uart0: serial@11002000 {
> > + compatible = "mediatek,mt2712-uart",
> > + "mediatek,mt6577-uart";
> > + reg = <0 0x11002000 0 0x400>;
> > + interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_LOW>;
> > + clocks = <&uart_clk>;
> > + status = "disabled";
> > + };
> > +
> > + uart1: serial@11003000 {
> > + compatible = "mediatek,mt2712-uart",
> > + "mediatek,mt6577-uart";
> > + reg = <0 0x11003000 0 0x400>;
> > + interrupts = <GIC_SPI 92 IRQ_TYPE_LEVEL_LOW>;
> > + clocks = <&uart_clk>;
> > + status = "disabled";
> > + };
> > +
> > + uart2: serial@11004000 {
> > + compatible = "mediatek,mt2712-uart",
> > + "mediatek,mt6577-uart";
> > + reg = <0 0x11004000 0 0x400>;
> > + interrupts = <GIC_SPI 93 IRQ_TYPE_LEVEL_LOW>;
> > + clocks = <&uart_clk>;
> > + status = "disabled";
> > + };
> > +
> > + uart3: serial@11005000 {
> > + compatible = "mediatek,mt2712-uart",
> > + "mediatek,mt6577-uart";
> > + reg = <0 0x11005000 0 0x400>;
> > + interrupts = <GIC_SPI 94 IRQ_TYPE_LEVEL_LOW>;
> > + clocks = <&uart_clk>;
> > + status = "disabled";
> > + };
> > +
> > + uart4: serial@11019000 {
> > + compatible = "mediatek,mt2712-uart",
> > + "mediatek,mt6577-uart";
> > + reg = <0 0x11019000 0 0x400>;
> > + interrupts = <GIC_SPI 126 IRQ_TYPE_LEVEL_LOW>;
> > + clocks = <&uart_clk>;
> > + status = "disabled";
> > + };
> > + };
> > +};
> > +
> >
>
> No PMU wired on this system?
After checking, there is a PMU on the system, but not verified yet.
And the plan for this patch series does not include PMU, is it
necessary?

Thanks for the review.

yt.shen

>
> Thanks,
>
> M.