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Date: Mon, 19 Aug 2019 19:42:30 +0800
From: Mars Cheng <mars.cheng@...iatek.com>
To: Marc Zyngier <maz@...nel.org>
CC: Matthias Brugger <matthias.bgg@...il.com>,
Rob Herring <robh@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
Sean Wang <sean.wang@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
<devicetree@...r.kernel.org>, CC Hwang <cc.hwang@...iatek.com>,
<wsd_upstream@...iatek.com>, Loda Chou <loda.chou@...iatek.com>,
<linux-kernel@...r.kernel.org>,
<linux-mediatek@...ts.infradead.org>,
mtk01761 <wendell.lin@...iatek.com>, <linux-clk@...r.kernel.org>
Subject: Re: [PATCH v2 11/11] arm64: dts: add dts nodes for MT6779
Hi Marc
On Mon, 2019-08-19 at 10:40 +0100, Marc Zyngier wrote:
> On 19/08/2019 10:21, Mars Cheng wrote:
> > this adds initial MT6779 dts settings fo board support,
> > including cpu, gic, timer, ccf, pinctrl, uart...etc.
> >
> > Signed-off-by: Mars Cheng <mars.cheng@...iatek.com>
> > ---
> > arch/arm64/boot/dts/mediatek/Makefile | 1 +
> > arch/arm64/boot/dts/mediatek/mt6779-evb.dtsi | 31 ++++
> > arch/arm64/boot/dts/mediatek/mt6779.dts | 229 ++++++++++++++++++++++++++
> > 3 files changed, 261 insertions(+)
> > create mode 100644 arch/arm64/boot/dts/mediatek/mt6779-evb.dtsi
> > create mode 100644 arch/arm64/boot/dts/mediatek/mt6779.dts
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dts/mediatek/Makefile
> > index 458bbc4..53f1c61 100644
> > --- a/arch/arm64/boot/dts/mediatek/Makefile
> > +++ b/arch/arm64/boot/dts/mediatek/Makefile
> > @@ -1,6 +1,7 @@
> > # SPDX-License-Identifier: GPL-2.0
> > dtb-$(CONFIG_ARCH_MEDIATEK) += mt2712-evb.dtb
> > dtb-$(CONFIG_ARCH_MEDIATEK) += mt6755-evb.dtb
> > +dtb-$(CONFIG_ARCH_MEDIATEK) += mt6779-evb.dtb
> > dtb-$(CONFIG_ARCH_MEDIATEK) += mt6795-evb.dtb
> > dtb-$(CONFIG_ARCH_MEDIATEK) += mt6797-evb.dtb
> > dtb-$(CONFIG_ARCH_MEDIATEK) += mt6797-x20-dev.dtb
> > diff --git a/arch/arm64/boot/dts/mediatek/mt6779-evb.dtsi b/arch/arm64/boot/dts/mediatek/mt6779-evb.dtsi
> > new file mode 100644
> > index 0000000..164f5cb
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt6779-evb.dtsi
> > @@ -0,0 +1,31 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (c) 2019 MediaTek Inc.
> > + * Author: Mars.C <mars.cheng@...iatek.com>
> > + *
> > + */
> > +
> > +/dts-v1/;
> > +#include "mt6779.dtsi"
> > +
> > +/ {
> > + model = "MediaTek MT6779 EVB";
> > + compatible = "mediatek,mt6779-evb", "mediatek,mt6779";
> > +
> > + aliases {
> > + serial0 = &uart0;
> > + };
> > +
> > + memory@...00000 {
> > + device_type = "memory";
> > + reg = <0 0x40000000 0 0x1e800000>;
> > + };
> > +
> > + chosen {
> > + stdout-path = "serial0:921600n8";
> > + };
> > +};
> > +
> > +&uart0 {
> > + status = "okay";
> > +};
> > diff --git a/arch/arm64/boot/dts/mediatek/mt6779.dts b/arch/arm64/boot/dts/mediatek/mt6779.dts
> > new file mode 100644
> > index 0000000..daa25b7
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt6779.dts
> > @@ -0,0 +1,229 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * Copyright (c) 2019 MediaTek Inc.
> > + * Author: Mars.C <mars.cheng@...iatek.com>
> > + *
> > + */
> > +
> > +#include <dt-bindings/clock/mt6779-clk.h>
> > +#include <dt-bindings/interrupt-controller/irq.h>
> > +#include <dt-bindings/interrupt-controller/arm-gic.h>
> > +
> > +/ {
> > + compatible = "mediatek,mt6779";
> > + interrupt-parent = <&sysirq>;
> > + #address-cells = <2>;
> > + #size-cells = <2>;
> > +
> > + psci {
> > + compatible = "arm,psci-0.2";
> > + method = "smc";
> > + };
> > +
> > + cpus {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + cpu0: cpu@0 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a55";
> > + enable-method = "psci";
> > + reg = <0x000>;
> > + };
> > +
> > + cpu1: cpu@1 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a55";
> > + enable-method = "psci";
> > + reg = <0x100>;
> > + };
> > +
> > + cpu2: cpu@2 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a55";
> > + enable-method = "psci";
> > + reg = <0x200>;
> > + };
> > +
> > + cpu3: cpu@3 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a55";
> > + enable-method = "psci";
> > + reg = <0x300>;
> > + };
> > +
> > + cpu4: cpu@4 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a55";
> > + enable-method = "psci";
> > + reg = <0x400>;
> > + };
> > +
> > + cpu5: cpu@5 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a55";
> > + enable-method = "psci";
> > + reg = <0x500>;
> > + };
> > +
> > + cpu6: cpu@6 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a75";
> > + enable-method = "psci";
> > + reg = <0x600>;
> > + };
> > +
> > + cpu7: cpu@7 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a75";
> > + enable-method = "psci";
> > + reg = <0x700>;
> > + };
> > + };
> > +
> > + clk26m: oscillator@0 {
> > + compatible = "fixed-clock";
> > + #clock-cells = <0>;
> > + clock-frequency = <26000000>;
> > + clock-output-names = "clk26m";
> > + };
> > +
> > + clk32k: oscillator@1 {
> > + compatible = "fixed-clock";
> > + #clock-cells = <0>;
> > + clock-frequency = <32768>;
> > + clock-output-names = "clk32k";
> > + };
> > +
> > + uart_clk: dummy26m {
> > + compatible = "fixed-clock";
> > + clock-frequency = <26000000>;
> > + #clock-cells = <0>;
> > + };
> > +
> > + timer {
> > + compatible = "arm,armv8-timer";
> > + interrupt-parent = <&gic>;
> > + interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_LOW>,
> > + <GIC_PPI 14 IRQ_TYPE_LEVEL_LOW>,
> > + <GIC_PPI 11 IRQ_TYPE_LEVEL_LOW>,
> > + <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>;
> > + };
> > +
> > + soc {
> > + #address-cells = <2>;
> > + #size-cells = <2>;
> > + compatible = "simple-bus";
> > + ranges;
> > +
> > + gic: interrupt-controller@...00000 {
> > + compatible = "arm,gic-v3";
> > + #interrupt-cells = <3>;
>
> You also haven't described the CPU PMUs. Depending on how they are wired
> (SPIs or PPIs), you may have to change the interrupt-cells property to
> include a cell for the PPI partitioning.
>
pmu nodes would be:
pmu {
compatible = "arm,armv8-pmuv3";
interrupt-parent = <&gic>;
interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW>;
};
dsu-pmu-0 {
compatible = "arm,dsu-pmu";
interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>;
cpus = <&cpu0>, <&cpu1>, <&cpu2>, <&cpu3>,
<&cpu4>, <&cpu5>, <&cpu6>, <&cpu7>;
};
so I think interrupt-cells could be <3>, will add pmu nodes in v3.
>
> > + #address-cells = <2>;
> > + #size-cells = <2>;
> > + #redistributor-regions = <1>;
>
> This is the default, so this can be omitted.
>
Got it, will remove it in v3.
> > + interrupt-parent = <&gic>;
> > + interrupt-controller;
> > + reg = <0 0x0c000000 0 0x40000>, /* GICD */
> > + <0 0x0c040000 0 0x200000>, /* GICR */
> > + <0 0x0c400000 0 0x2000>, /* GICC */
> > + <0 0x0c410000 0 0x1000>, /* GICH */
> > + <0 0x0c420000 0 0x2000>; /* GICV */
>
> Where do the last 3 ranges come from? Neither Cortex-A55 nor A75 have
> the memory-mapped CPU interface. It looks like a copy/paste from another
> SoC...
>
My bad, should remove the last 3 interfaces. will do in v3.
> > + interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;
> > + };
>
> And no ITS?
>
No, we don't have ITS support in HW.
Thanks.
> M.
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