Re: [PATCH v1 17/19] arm64: dts: nuvoton: Add initial NPCM8XX device tree

[Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>]

On 22/05/2022 17:50, Tomer Maimon wrote:
> This adds initial device tree support for the
> Nuvoton NPCM845 Board Management controller (BMC) SoC family.

Thank you for your patch. There is something to discuss/improve.

> 
> The NPCM845 based quad-core Cortex-A35 ARMv8 architecture and
> have various peripheral IPs.
> 
> Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
> ---
>  arch/arm64/boot/dts/Makefile                  |   1 +
>  .../dts/nuvoton/nuvoton-common-npcm8xx.dtsi   | 197 ++++++++++++++++++
>  .../boot/dts/nuvoton/nuvoton-npcm845.dtsi     |  77 +++++++
>  3 files changed, 275 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/nuvoton/nuvoton-common-npcm8xx.dtsi
>  create mode 100644 arch/arm64/boot/dts/nuvoton/nuvoton-npcm845.dtsi
> 
> diff --git a/arch/arm64/boot/dts/Makefile b/arch/arm64/boot/dts/Makefile
> index 1ba04e31a438..7b107fa7414b 100644
> --- a/arch/arm64/boot/dts/Makefile
> +++ b/arch/arm64/boot/dts/Makefile
> @@ -19,6 +19,7 @@ subdir-y += lg
>  subdir-y += marvell
>  subdir-y += mediatek
>  subdir-y += microchip
> +subdir-y += nuvoton
>  subdir-y += nvidia
>  subdir-y += qcom
>  subdir-y += realtek
> diff --git a/arch/arm64/boot/dts/nuvoton/nuvoton-common-npcm8xx.dtsi b/arch/arm64/boot/dts/nuvoton/nuvoton-common-npcm8xx.dtsi
> new file mode 100644
> index 000000000000..19c672ecfee7
> --- /dev/null
> +++ b/arch/arm64/boot/dts/nuvoton/nuvoton-common-npcm8xx.dtsi
> @@ -0,0 +1,197 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2021 Nuvoton Technology tomer.maimon@nuvoton.com
> +
> +#include <dt-bindings/clock/nuvoton,npcm8xx-clock.h>
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +#include <dt-bindings/interrupt-controller/irq.h>
> +
> +/ {
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +	interrupt-parent = <&gic>;
> +
> +	/* external reference clock */
> +	clk_refclk: clk-refclk {
> +		compatible = "fixed-clock";
> +		#clock-cells = <0>;
> +		clock-frequency = <25000000>

This is not a property of a SoC, but board.

> +		clock-output-names = "refclk";
> +	};
> +
> +	/* external reference clock for cpu. float in normal operation */
> +	clk_sysbypck: clk-sysbypck {
> +		compatible = "fixed-clock";
> +		#clock-cells = <0>;
> +		clock-frequency = <1000000000>;

This is not a property of a SoC, but board.


> +		clock-output-names = "sysbypck";
> +	};
> +
> +	/* external reference clock for MC. float in normal operation */
> +	clk_mcbypck: clk-mcbypck {
> +		compatible = "fixed-clock";
> +		#clock-cells = <0>;
> +		clock-frequency = <1050000000>;

This is not a property of a SoC, but board.

> +		clock-output-names = "mcbypck";
> +	};
> +
> +	soc {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		compatible = "simple-bus";
> +		interrupt-parent = <&gic>;
> +		ranges;
> +
> +		gcr: gcr@f0800000 {

Generic node names. I guess it is system-controller?

> +			compatible = "nuvoton,npcm845-gcr", "syscon",
> +				"simple-mfd";
> +			reg = <0x0 0xf0800000 0x0 0x1000>;
> +		};
> +
> +		gic: interrupt-controller@dfff9000 {
> +			compatible = "arm,gic-400";
> +			reg = <0x0 0xdfff9000 0x0 0x1000>,
> +			      <0x0 0xdfffa000 0x0 0x2000>,
> +			      <0x0 0xdfffc000 0x0 0x2000>,
> +			      <0x0 0xdfffe000 0x0 0x2000>;
> +			interrupts = <GIC_PPI 9 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> +			#interrupt-cells = <3>;
> +			interrupt-controller;
> +			#address-cells = <0>;
> +			ppi-partitions {
> +				ppi_cluster0: interrupt-partition-0 {
> +					affinity = <&cpu0 &cpu1 &cpu2 &cpu3>;
> +				};
> +			};
> +		};
> +	};
> +
> +	ahb {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		compatible = "simple-bus";
> +		interrupt-parent = <&gic>;
> +		ranges;
> +
> +		rstc: rstc@f0801000 {

Generic node names.

> +			compatible = "nuvoton,npcm845-reset";
> +			reg = <0x0 0xf0801000 0x0 0x78>;
> +			#reset-cells = <2>;
> +			syscon = <&gcr>;
> +		};
> +
> +		clk: clock-controller@f0801000 {
> +			compatible = "nuvoton,npcm845-clk";
> +			#clock-cells = <1>;
> +			reg = <0x0 0xf0801000 0x0 0x1000>;
> +			clock-names = "refclk", "sysbypck", "mcbypck";
> +			clocks = <&clk_refclk>, <&clk_sysbypck>, <&clk_mcbypck>;
> +		};
> +
> +		apb {
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +			compatible = "simple-bus";
> +			interrupt-parent = <&gic>;
> +			ranges = <0x0 0x0 0xf0000000 0x00300000>,
> +				<0xfff00000 0x0 0xfff00000 0x00016000>;
> +
> +			timer0: timer@8000 {
> +				compatible = "nuvoton,npcm845-timer";
> +				interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
> +				reg = <0x8000 0x1C>;
> +				clocks	= <&clk_refclk>;
> +				clock-names = "refclk";
> +			};
> +
> +			serial0: serial@0 {
> +				compatible = "nuvoton,npcm845-uart";
> +				reg = <0x0 0x1000>;
> +				clocks = <&clk NPCM8XX_CLK_UART>;
> +				interrupts = <GIC_SPI 192 IRQ_TYPE_LEVEL_HIGH>;
> +				reg-shift = <2>;
> +				status = "disabled";
> +			};
> +
> +			serial1: serial@1000 {
> +				compatible = "nuvoton,npcm845-uart";
> +				reg = <0x1000 0x1000>;
> +				clocks = <&clk NPCM8XX_CLK_UART>;
> +				interrupts = <GIC_SPI 193 IRQ_TYPE_LEVEL_HIGH>;
> +				reg-shift = <2>;
> +				status = "disabled";
> +			};
> +
> +			serial2: serial@2000 {
> +				compatible = "nuvoton,npcm845-uart";
> +				reg = <0x2000 0x1000>;
> +				clocks = <&clk NPCM8XX_CLK_UART>;
> +				interrupts = <GIC_SPI 194 IRQ_TYPE_LEVEL_HIGH>;
> +				reg-shift = <2>;
> +				status = "disabled";
> +			};
> +
> +			serial3: serial@3000 {
> +				compatible = "nuvoton,npcm845-uart";
> +				reg = <0x3000 0x1000>;
> +				clocks = <&clk NPCM8XX_CLK_UART>;
> +				interrupts = <GIC_SPI 195 IRQ_TYPE_LEVEL_HIGH>;
> +				reg-shift = <2>;
> +				status = "disabled";
> +			};
> +
> +			serial4: serial@4000 {
> +				compatible = "nuvoton,npcm845-uart";
> +				reg = <0x4000 0x1000>;
> +				clocks = <&clk NPCM8XX_CLK_UART>;
> +				interrupts = <GIC_SPI 196 IRQ_TYPE_LEVEL_HIGH>;
> +				reg-shift = <2>;
> +				status = "disabled";
> +			};
> +
> +			serial5: serial@5000 {
> +				compatible = "nuvoton,npcm845-uart";
> +				reg = <0x5000 0x1000>;
> +				clocks = <&clk NPCM8XX_CLK_UART>;
> +				interrupts = <GIC_SPI 197 IRQ_TYPE_LEVEL_HIGH>;
> +				reg-shift = <2>;
> +				status = "disabled";
> +			};
> +
> +			serial6: serial@6000 {
> +				compatible = "nuvoton,npcm845-uart";
> +				reg = <0x6000 0x1000>;
> +				clocks = <&clk NPCM8XX_CLK_UART>;
> +				interrupts = <GIC_SPI 198 IRQ_TYPE_LEVEL_HIGH>;
> +				reg-shift = <2>;
> +				status = "disabled";
> +			};
> +
> +			watchdog0: watchdog@801c {
> +				compatible = "nuvoton,npcm845-wdt";
> +				interrupts = <GIC_SPI 47 IRQ_TYPE_LEVEL_HIGH>;
> +				reg = <0x801c 0x4>;
> +				status = "disabled";
> +				clocks = <&clk_refclk>;
> +				syscon = <&gcr>;
> +			};
> +
> +			watchdog1: watchdog@901c {
> +				compatible = "nuvoton,npcm845-wdt";
> +				interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
> +				reg = <0x901c 0x4>;
> +				status = "disabled";
> +				clocks = <&clk_refclk>;
> +				syscon = <&gcr>;
> +			};
> +
> +			watchdog2: watchdog@a01c {
> +				compatible = "nuvoton,npcm845-wdt";
> +				interrupts = <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>;
> +				reg = <0xa01c 0x4>;
> +				status = "disabled";
> +				clocks = <&clk_refclk>;
> +				syscon = <&gcr>;
> +			};
> +		};
> +	};
> +};
> diff --git a/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845.dtsi b/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845.dtsi
> new file mode 100644
> index 000000000000..900cee112251
> --- /dev/null
> +++ b/arch/arm64/boot/dts/nuvoton/nuvoton-npcm845.dtsi
> @@ -0,0 +1,77 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (c) 2021 Nuvoton Technology tomer.maimon@nuvoton.com
> +
> +#include "nuvoton-common-npcm8xx.dtsi"
> +
> +/ {
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +	interrupt-parent = <&gic>;

You do not have gic here, so it's not correct. Do not reference nodes
outsides of the file.

> +
> +	cpus {
> +		#address-cells = <2>;
> +		#size-cells = <0>;
> +
> +		cpu0: cpu@0 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a35";
> +			clocks = <&clk NPCM8XX_CLK_CPU>;
> +			reg = <0x0 0x0>;

Why do you have two address cells? A bit more complicated and not
necessary, I think.

> +			next-level-cache = <&l2>;
> +			enable-method = "psci";
> +		};
> +
> +		cpu1: cpu@1 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a35";
> +			clocks = <&clk NPCM8XX_CLK_CPU>;
> +			reg = <0x0 0x1>;
> +			next-level-cache = <&l2>;
> +			enable-method = "psci";
> +		};
> +
> +		cpu2: cpu@2 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a35";
> +			clocks = <&clk NPCM8XX_CLK_CPU>;
> +			reg = <0x0 0x2>;
> +			next-level-cache = <&l2>;
> +			enable-method = "psci";
> +		};
> +
> +		cpu3: cpu@3 {
> +			device_type = "cpu";
> +			compatible = "arm,cortex-a35";
> +			clocks = <&clk NPCM8XX_CLK_CPU>;
> +			reg = <0x0 0x3>;
> +			next-level-cache = <&l2>;
> +			enable-method = "psci";
> +		};
> +
> +		l2: l2-cache {
> +			compatible = "cache";

Is this a real compatible? What bindings are you using here?

> +		};
> +	};
> +
> +	arm-pmu {
> +		compatible = "arm,cortex-a35-pmu";
> +		interrupts = <GIC_SPI 242 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 243 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 244 IRQ_TYPE_LEVEL_HIGH>,
> +			     <GIC_SPI 245 IRQ_TYPE_LEVEL_HIGH>;
> +		interrupt-affinity = <&cpu0>, <&cpu1>, <&cpu2>, <&cpu3>;
> +	};
> +
> +	psci {
> +		compatible      = "arm,psci-1.0";
> +		method          = "smc";

Weird indentation.

> +	};
> +
> +	timer {
> +		compatible = "arm,armv8-timer";
> +		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> +	};
> +};


Best regards,
Krzysztof