Subject: Re: [PATCH 5/6] arm64: dts: Add ipq6018 SoC and CP01 board support

From: Bjorn Andersson <[email-masked]>
Date: Fri, 7 Jun 2019 20:48:35 -0700

On Wed 05 Jun 10:16 PDT 2019, Sricharan R wrote:

> Add initial device tree support for the Qualcomm IPQ6018 SoC and
> CP01 evaluation board.
> 
> Signed-off-by: Sricharan R <[email-masked]>
> Signed-off-by: Abhishek Sahu <[email-masked]>

Please fix the order of these (or add a Co-developed-by).

> ---
>  arch/arm64/boot/dts/qcom/Makefile            |   1 +
>  arch/arm64/boot/dts/qcom/ipq6018-cp01-c1.dts |  35 ++++
>  arch/arm64/boot/dts/qcom/ipq6018.dtsi        | 231 +++++++++++++++++++++++++++
>  3 files changed, 267 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/qcom/ipq6018-cp01-c1.dts
>  create mode 100644 arch/arm64/boot/dts/qcom/ipq6018.dtsi
> 
> diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
> index 21d548f..ac22dbb 100644
> --- a/arch/arm64/boot/dts/qcom/Makefile
> +++ b/arch/arm64/boot/dts/qcom/Makefile
> @@ -2,6 +2,7 @@
>  dtb-$(CONFIG_ARCH_QCOM)	+= apq8016-sbc.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= apq8096-db820c.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= ipq8074-hk01.dtb
> +dtb-$(CONFIG_ARCH_QCOM)	+= ipq6018-cp01-c1.dtb

Sort order.

>  dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-mtp.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= msm8992-bullhead-rev-101.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= msm8994-angler-rev-101.dtb
> diff --git a/arch/arm64/boot/dts/qcom/ipq6018-cp01-c1.dts b/arch/arm64/boot/dts/qcom/ipq6018-cp01-c1.dts
> new file mode 100644
> index 0000000..ac7cb22
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/ipq6018-cp01-c1.dts
> @@ -0,0 +1,35 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * IPQ6018 CP01 board device tree source
> + *
> + * Copyright (c) 2019, The Linux Foundation. All rights reserved.
> + */
> +
> +/dts-v1/;
> +
> +#include "ipq6018.dtsi"
> +
> +/ {
> +	#address-cells = <0x2>;
> +	#size-cells = <0x2>;

This is a count, write it in base 10..

> +	model = "Qualcomm Technologies, Inc. IPQ6018/AP-CP01-C1";
> +	compatible = "qcom,ipq6018-cp01", "qcom,ipq6018";
> +	interrupt-parent = <&intc>;

Changing #address-cells, #size-cells and interrupt-parent will break the
dtsi, so I think you should specify them there.

> +};
> +
> +&tlmm {

Please sort your nodes based on address, then node name, then label.

> +	uart_pins: uart_pins {
> +		mux {
> +			pins = "gpio44", "gpio45";
> +			function = "blsp2_uart";
> +			drive-strength = <8>;
> +			bias-pull-down;
> +		};
> +	};
> +};
> +
> +&blsp1_uart3 {
> +	pinctrl-0 = <&uart_pins>;
> +	pinctrl-names = "default";
> +	status = "ok";
> +};
> diff --git a/arch/arm64/boot/dts/qcom/ipq6018.dtsi b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
> new file mode 100644
> index 0000000..79cccdd
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/ipq6018.dtsi
> @@ -0,0 +1,231 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * IPQ6018 SoC device tree source
> + *
> + * Copyright (c) 2019, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +#include <dt-bindings/clock/qcom,gcc-ipq6018.h>
> +
> +/ {
> +	model = "Qualcomm Technologies, Inc. IPQ6018";
> +	compatible = "qcom,ipq6018";

No need for model and compatible in the dtsi, these should always be
specified by the including file.

> +
> +	chosen {
> +		bootargs = "console=ttyMSM0,115200,n8 rw init=/init";

Do you really need console? Can't you use stdout-path?

And there's no need to specify init=/init.

> +		bootargs-append = " swiotlb=1 clk_ignore_unused";

I'm hoping that you will work on removing the need for
clk_ignore_unused.

> +	};
> +
> +	reserved-memory {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		tz:tz@48500000 {

Space after :

> +			no-map;
> +			reg = <0x0 0x48500000 0x0 0x00200000>;

I would prefer to have the reg first in these nodes, then the region's
properties.

> +		};
> +	};
> +
> +	soc: soc {
> +		#address-cells = <0x1>;
> +		#size-cells = <0x1>;
> +		ranges = <0 0 0 0xffffffff>;
> +		dma-ranges;
> +		compatible = "simple-bus";
> +
> +		intc: interrupt-controller@b000000 {

As described above, please sort your nodes based on address, node name
and lastly label name.

> +			compatible = "qcom,msm-qgic2";
> +			interrupt-controller;
> +			#interrupt-cells = <0x3>;
> +			reg = <0xb000000 0x1000>, <0xb002000 0x1000>;
> +		};
> +
> +		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)>;
> +		};
> +
> +		timer@b120000 {
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			ranges;
> +			compatible = "arm,armv7-timer-mem";
> +			reg = <0xb120000 0x1000>;

Please pad addresses in reg to 8 digits, to make them faster to compare.

> +			clock-frequency = <19200000>;
> +
> +			frame@b120000 {
> +				frame-number = <0>;
> +				interrupts = <GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>,
> +					     <GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>;
> +				reg = <0xb121000 0x1000>,
> +				      <0xb122000 0x1000>;
> +			};
> +
> +			frame@b123000 {
> +				frame-number = <1>;
> +				interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>;
> +				reg = <0xb123000 0x1000>;
> +				status = "disabled";
> +			};
> +
> +			frame@b124000 {
> +				frame-number = <2>;
> +				interrupts = <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>;
> +				reg = <0xb124000 0x1000>;
> +				status = "disabled";
> +			};
> +
> +			frame@b125000 {
> +				frame-number = <3>;
> +				interrupts = <GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>;
> +				reg = <0xb125000 0x1000>;
> +				status = "disabled";
> +			};
> +
> +			frame@b126000 {
> +				frame-number = <4>;
> +				interrupts = <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>;
> +				reg = <0xb126000 0x1000>;
> +				status = "disabled";
> +			};
> +
> +			frame@b127000 {
> +				frame-number = <5>;
> +				interrupts = <GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>;
> +				reg = <0xb127000 0x1000>;
> +				status = "disabled";
> +			};
> +
> +			frame@b128000 {
> +				frame-number = <6>;
> +				interrupts = <GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>;
> +				reg = <0xb128000 0x1000>;
> +				status = "disabled";
> +			};
> +		};
> +
> +		gcc: gcc@1800000 {
> +			compatible = "qcom,gcc-ipq6018";
> +			reg = <0x1800000 0x80000>;
> +			#clock-cells = <0x1>;

This is a count, use base 10.

> +			#reset-cells = <0x1>;
> +		};
> +
> +		blsp1_uart3: serial@78b1000 {
> +			compatible = "qcom,msm-uartdm-v1.4", "qcom,msm-uartdm";
> +			reg = <0x78b1000 0x200>;
> +			interrupts = <GIC_SPI 306 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&gcc GCC_BLSP1_UART3_APPS_CLK>,
> +				<&gcc GCC_BLSP1_AHB_CLK>;
> +			clock-names = "core", "iface";
> +			status = "disabled";
> +		};
> +
> +		tlmm: pinctrl@1000000 {
> +			compatible = "qcom,ipq6018-pinctrl";
> +			reg = <0x1000000 0x300000>;
> +			interrupts = <GIC_SPI 0xd0 IRQ_TYPE_NONE>;
> +			gpio-controller;
> +			#gpio-cells = <0x2>;

gpio-ranges = <&tlmm 0 80>;

> +			interrupt-controller;
> +			#interrupt-cells = <0x2>;
> +
> +			uart_pins: uart_pins {
> +				pins = "gpio44", "gpio45";
> +				function = "blsp2_uart";
> +				drive-strength = <8>;
> +				bias-pull-down;
> +			};
> +		};
> +	};
> +
> +	psci: psci {
> +		compatible = "arm,psci-1.0";
> +		method = "smc";
> +	};
> +
> +	cpus: cpus {
> +		#address-cells = <0x1>;
> +		#size-cells = <0x0>;
> +
> +		CPU0: cpu@0 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53";
> +			reg = <0x0>;
> +			enable-method = "psci";
> +			next-level-cache = <&L2_0>;
> +		};
> +
> +		CPU1: cpu@1 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53";
> +			enable-method = "psci";
> +			reg = <0x1>;
> +			next-level-cache = <&L2_0>;
> +		};
> +
> +		CPU2: cpu@2 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53";
> +			enable-method = "psci";
> +			reg = <0x2>;
> +			next-level-cache = <&L2_0>;
> +		};
> +
> +		CPU3: cpu@3 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a53";
> +			enable-method = "psci";
> +			reg = <0x3>;
> +			next-level-cache = <&L2_0>;
> +		};
> +
> +		L2_0: l2-cache {
> +			compatible = "cache";
> +			cache-level = <0x2>;
> +		};
> +	};
> +
> +	pmuv8: pmu {
> +		compatible = "arm,armv8-pmuv3";
> +		interrupts = <GIC_PPI 7 (GIC_CPU_MASK_SIMPLE(4) |
> +					 IRQ_TYPE_LEVEL_HIGH)>;
> +	};
> +
> +	clocks {
> +		sleep_clk: sleep_clk {

Don't use _ in the node names.

> +			compatible = "fixed-clock";
> +			clock-frequency = <32000>;
> +			#clock-cells = <0>;
> +		};
> +
> +		xo: xo {
> +			compatible = "fixed-clock";
> +			clock-frequency = <24000000>;
> +			#clock-cells = <0>;
> +		};
> +
> +		bias_pll_cc_clk {

Please give this a label and reference it from the node that uses it
(regardless of the implementation matching by clock name).

> +			compatible = "fixed-clock";
> +			clock-frequency = <300000000>;
> +			#clock-cells = <0>;
> +		};
> +
> +		bias_pll_nss_noc_clk {
> +			compatible = "fixed-clock";
> +			clock-frequency = <416500000>;
> +			#clock-cells = <0>;
> +		};
> +
> +		usb3phy_0_cc_pipe_clk {

This should come from the PHY.

> +			compatible = "fixed-clock";
> +			clock-frequency = <125000000>;
> +			#clock-cells = <0>;
> +		};

Regards,
Bjorn

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