Re: [PATCH 4/5] arm64: dts: Add ipq8074 SoC and MTP board support

[Stephen Boyd]

On 04/28, Varadarajan Narayanan wrote:
> diff --git a/arch/arm64/boot/dts/qcom/ipq8074-hk01.dts b/arch/arm64/boot/dts/qcom/ipq8074-hk01.dts
> new file mode 100644
> index 0000000..c150bea
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/ipq8074-hk01.dts
> @@ -0,0 +1,48 @@
> +/dts-v1/;
> +/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +#include "ipq8074.dtsi"
> +
> +/ {
> +	#address-cells = <0x2>;
> +	#size-cells = <0x2>;
> +	model = "Qualcomm Technologies, Inc. IPQ8074-HK01";
> +	compatible = "qcom,ipq8074-hk01", "qcom,ipq8074";
> +	interrupt-parent = <&intc>;
> +
> +	chosen {
> +		bootargs = "console=ttyMSM0,115200,n8 root=/dev/ram0 rw init=/init";

Add an aliases node for serial0 and use a chosen node with stdout-path = "serial0" instead please.

> +	};
> +
> +	memory {
> +		device_type = "memory";
> +		reg = <0x0 0x40000000 0x0 0x20000000>;
> +	};
> +
> +	soc: soc {

Do you need the soc label here? Please remove.

> +		pinctrl@1000000 {
> +			serial_4_pins: serial4_pinmux {
> +				mux {
> +					pins = "gpio23", "gpio24";
> +					function = "blsp4_uart1";
> +					bias-disable;
> +				};
> +			};
> +		};
> +
> +		serial@78b3000 {
> +			pinctrl-0 = <&serial_4_pins>;
> +			pinctrl-names = "default";
> +			status = "ok";
> +		};
> +	};
> +};
> diff --git a/arch/arm64/boot/dts/qcom/ipq8074.dtsi b/arch/arm64/boot/dts/qcom/ipq8074.dtsi
> new file mode 100644
> index 0000000..f910cc0
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/ipq8074.dtsi
> @@ -0,0 +1,153 @@
> +/*
> + * Copyright (c) 2017, The Linux Foundation. All rights reserved.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 and
> + * only version 2 as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +#include <dt-bindings/clock/qcom,gcc-ipq8074.h>
> +
> +/ {
> +	model = "Qualcomm Technologies, Inc. IPQ8074";
> +	compatible = "qcom,ipq8074";
> +
> +	soc: soc {
> +		#address-cells = <0x1>;
> +		#size-cells = <0x1>;
> +		ranges = <0 0 0 0xffffffff>;
> +		compatible = "simple-bus";
> +
> +		pinctrl@1000000 {
> +			compatible = "qcom,ipq8074-pinctrl";
> +			reg = <0x1000000 0x300000>;
> +			interrupts = <GIC_SPI 208 IRQ_TYPE_LEVEL_HIGH>;
> +			gpio-controller;
> +			#gpio-cells = <0x2>;
> +			interrupt-controller;
> +			#interrupt-cells = <0x2>;
> +		};
> +
> +		intc: interrupt-controller@b000000 {
> +			compatible = "qcom,msm-qgic2";
> +			interrupt-controller;
> +			#interrupt-cells = <0x3>;
> +			reg = <0xb000000 0x1000>,
> +			<0xb002000 0x1000>;

Please align this up with previous reg property.

> +		};
> +
> +		timer {
> +			compatible = "arm,armv8-timer";
> +			interrupts = <GIC_PPI 2 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +				     <GIC_PPI 3 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +				     <GIC_PPI 4 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +				     <GIC_PPI 1 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> +		};

Is there an mmio timer as well? We should add it too.

> +
> +		gcc: gcc@1800000 {
> +			compatible = "qcom,gcc-ipq8074";
> +			reg = <0x1800000 0x80000>;

Wow that is a huge area! Is it really that large?

> +			#clock-cells = <0x1>;
> +			#reset-cells = <0x1>;
> +		};
> +
> +		serial@78b3000 {
> +			compatible = "qcom,msm-uartdm-v1.4", "qcom,msm-uartdm";
> +			reg = <0x78b3000 0x200>;
> +			interrupts = <GIC_SPI 308 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&gcc GCC_BLSP1_UART5_APPS_CLK>,
> +				 <&gcc GCC_BLSP1_AHB_CLK>;
> +			clock-names = "core", "iface";
> +			status = "disabled";
> +		};
> +	};
> +
> +	cpus {
> +		#address-cells = <0x1>;
> +		#size-cells = <0x0>;
> +
> +		cpu-map {
> +
> +			cluster0 {
> +
> +				core0 {
> +					cpu = <&CPU0>;
> +				};
> +
> +				core1 {
> +					cpu = <&CPU1>;
> +				};
> +
> +				core2 {
> +					cpu = <&CPU2>;
> +				};
> +
> +				core3 {
> +					cpu = <&CPU3>;
> +				};
> +			};
> +		};

Is this needed? Looks ok, but just curious if we need to do it
for other arm64 platforms we support.

> +
> +		CPU0: cpu@0 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53", "arm,armv8";
> +			reg = <0x0>;
> +			next-level-cache = <&L2_0>;
> +			enable-method = "psci";
> +		};
> +
> +		CPU1: cpu@1 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53", "arm,armv8";
> +			enable-method = "psci";
> +			reg = <0x1>;
> +			next-level-cache = <&L2_0>;
> +		};
> +
> +		CPU2: cpu@2 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53", "arm,armv8";
> +			enable-method = "psci";
> +			reg = <0x2>;
> +			next-level-cache = <&L2_0>;
> +		};
> +
> +		CPU3: cpu@3 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53", "arm,armv8";
> +			enable-method = "psci";
> +			reg = <0x3>;
> +			next-level-cache = <&L2_0>;
> +		};
> +
> +		L2_0: l2-cache {
> +			compatible = "cache";
> +			cache-level = <0x2>;
> +		};

This should be inside some CPU? CPU0?

> +	};

We should be able to add the performance monitor node too?

> +
> +	psci {
> +		compatible = "arm,psci-1.0";
> +		method = "smc";
> +	};
> +
> +	clocks {
> +		sleep_clk: sleep_clk {
> +			compatible = "fixed-clock";
> +			clock-frequency = <32000>;

Not 32765 or 32768?

> +			#clock-cells = <0>;
> +		};
> +
> +		xo: xo {
> +			compatible = "fixed-clock";
> +			clock-frequency = <19200000>;
> +			#clock-cells = <0>;
> +		};
> +	};

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