linux-kernel - Re: [PATCH v3 2/3] arm64: dts: mt7622: add basic nodes to the mt7622.dtsi file

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Date:   Fri, 9 Jun 2017 00:07:42 +0800
From:   Sean Wang <sean.wang@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     <robh+dt@...nel.org>, <mark.rutland@....com>,
        <devicetree@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/3] arm64: dts: mt7622: add basic nodes to the
 mt7622.dtsi file

On Thu, 2017-06-08 at 15:52 +0200, Matthias Brugger wrote:
> 
> On 31/05/17 19:29, sean.wang@...iatek.com wrote:
> > From: Sean Wang <sean.wang@...iatek.com>
> > 
> > add basic nodes into the mt7622.dtsi for the system
> > bring-up which includes ARM CPU, GIC, timer, MediaTek
> > UART, SYSIRQ and one reserved memory region for ATF.
> > 
> > Signed-off-by: Sean Wang <sean.wang@...iatek.com>
> > ---
> >   arch/arm64/boot/dts/mediatek/mt7622.dtsi | 103 +++++++++++++++++++++++++++++++
> >   1 file changed, 103 insertions(+)
> >   create mode 100644 arch/arm64/boot/dts/mediatek/mt7622.dtsi
> > 
> > diff --git a/arch/arm64/boot/dts/mediatek/mt7622.dtsi b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
> > new file mode 100644
> > index 0000000..2031b73
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
> > @@ -0,0 +1,103 @@
> > +/*
> > + * Copyright (c) 2017 MediaTek Inc.
> > + * Author: Ming Huang <ming.huang@...iatek.com>
> > + *	   Sean Wang <sean.wang@...iatek.com>
> > + *
> > + * 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,mt7622";
> > +	interrupt-parent = <&sysirq>;
> > +	#address-cells = <2>;
> > +	#size-cells = <2>;
> > +
> > +	cpus {
> > +		#address-cells = <2>;
> > +		#size-cells = <0>;
> > +
> > +		cpu0: cpu@0 {
> > +			device_type = "cpu";
> > +			compatible = "arm,cortex-a53", "arm,armv8";
> > +			reg = <0x0 0x0>;
> > +			enable-method = "psci";
> > +			clock-frequency = <1300000000>;
> > +		};
> > +
> > +		cpu1: cpu@1 {
> > +			device_type = "cpu";
> > +			compatible = "arm,cortex-a53", "arm,armv8";
> > +			reg = <0x0 0x1>;
> > +			enable-method = "psci";
> > +			clock-frequency = <1300000000>;
> > +		};
> > +	};
> > +
> > +	uart_clk: dummy26m {
> > +		compatible = "fixed-clock";
> > +		#clock-cells = <0>;
> > +		clock-frequency = <25000000>;
> > +	};
> > +
> > +	psci {
> > +		compatible  = "arm,psci-0.2";
> > +		method      = "smc";
> > +	};
> > +
> > +	reserved-memory {
> > +		#address-cells = <2>;
> > +		#size-cells = <2>;
> > +		ranges;
> > +
> > +		/* 192 KiB reserved for ARM Trusted Firmware (BL31) */
> > +		secmon_reserved: secmon@...00000 {
> > +			reg = <0 0x43000000 0 0x30000>;
> > +			no-map;
> > +		};
> > +	};
> > +
> > +	timer {
> > +		compatible = "arm,armv8-timer";
> > +		interrupt-parent = <&gic>;
> > +		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(2) |
> > +			      IRQ_TYPE_LEVEL_HIGH)>,
> > +			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(2) |
> > +			      IRQ_TYPE_LEVEL_HIGH)>,
> > +			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(2) |
> > +			      IRQ_TYPE_LEVEL_HIGH)>,
> > +			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(2) |
> > +			      IRQ_TYPE_LEVEL_HIGH)>;
> > +	};
> > +
> > +	sysirq: interrupt-controller@...00620 {
> > +		compatible = "mediatek,mt7622-sysirq",
> > +			     "mediatek,mt6577-sysirq";
> > +		interrupt-controller;
> > +		#interrupt-cells = <3>;
> > +		interrupt-parent = <&gic>;
> > +		reg = <0 0x10200620 0 0x20>;
> > +	};
> > +
> > +	gic: interrupt-controller@...00000 {
> > +		compatible = "arm,gic-400";
> > +		interrupt-controller;
> > +		#interrupt-cells = <3>;
> > +		interrupt-parent = <&gic>;
> > +		reg = <0 0x10310000 0 0x1000>,
> > +		      <0 0x10320000 0 0x1000>,
> > +		      <0 0x10340000 0 0x2000>,
> > +		      <0 0x10360000 0 0x2000>;
> > +	};
> > +
> > +	uart0: serial@...02000 {
> > +		compatible = "mediatek,mt7622-uart",
> > +			     "mediatek,mt6577-uart";
> > +		reg = <0 0x11002000 0 0x400>;
> > +		interrupts = <GIC_SPI 91 IRQ_TYPE_LEVEL_LOW>;
> > +		clocks = <&uart_clk>;
> 
> mt6577-uart has two clocks. Please fix this.

Those two real clocks which UART requires will be updated once the
MT7622 clock driver and the relevant binding header are all ready.
So currently the UART is using dummy clock node instead.

Is it allowed? 


> I would appreciate if you could rebase on the mediatek for-next branch 
> (especially for 3/3), which will make it easier for me to take this.
> 

O.K. I will rebase on your tree

	Sean

> Regards,
> Matthias