linux-kernel - Re: [PATCH v6 08/12] arm64: dts: nuvoton: Add initial ma35d1 device tree

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Date:   Tue, 28 Mar 2023 10:57:57 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Jacky Huang <ychuang570808@...il.com>, gregkh@...uxfoundation.org,
        jirislaby@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        lee@...nel.org, mturquette@...libre.com, p.zabel@...gutronix.de,
        robh+dt@...nel.org
Cc:     devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        arnd@...db.de, schung@...oton.com, mjchen@...oton.com,
        Jacky Huang <ychuang3@...oton.com>
Subject: Re: [PATCH v6 08/12] arm64: dts: nuvoton: Add initial ma35d1 device tree

Quoting Jacky Huang (2023-03-27 19:19:08)
> diff --git a/arch/arm64/boot/dts/nuvoton/ma35d1.dtsi b/arch/arm64/boot/dts/nuvoton/ma35d1.dtsi
> new file mode 100644
> index 000000000000..0740b0b218a7
> --- /dev/null
> +++ b/arch/arm64/boot/dts/nuvoton/ma35d1.dtsi
> @@ -0,0 +1,231 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2023 Nuvoton Technology Corp.
> + * Author: Shan-Chun Hung <schung@...oton.com>
> + *         Jacky huang <ychuang3@...oton.com>
> + */
> +
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +#include <dt-bindings/input/input.h>
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/clock/nuvoton,ma35d1-clk.h>
> +#include <dt-bindings/reset/nuvoton,ma35d1-reset.h>
> +
> +/ {
> +       compatible = "nuvoton,ma35d1";
> +       interrupt-parent = <&gic>;
> +       #address-cells = <2>;
> +       #size-cells = <2>;
> +
> +       cpus {
> +               #address-cells = <2>;
> +               #size-cells = <0>;
> +
> +               cpu0: cpu@0 {
> +                       device_type = "cpu";
> +                       compatible = "arm,cortex-a35";
> +                       reg = <0x0 0x0>;
> +                       enable-method = "psci";
> +                       next-level-cache = <&L2_0>;
> +               };
> +
> +               cpu1: cpu@1 {
> +                       device_type = "cpu";
> +                       compatible = "arm,cortex-a35";
> +                       reg = <0x0 0x1>;
> +                       enable-method = "psci";
> +                       next-level-cache = <&L2_0>;
> +               };
> +
> +               L2_0: l2-cache0 {

Just l2-cache for the node name. Doesn't it go under the cpu0 node as
well?

> +                       compatible = "cache";
> +                       cache-level = <2>;
> +               };
> +       };
> +
> +       psci {
> +               compatible = "arm,psci-0.2";
> +               method = "smc";
> +       };
> +
> +       timer {
> +               compatible = "arm,armv8-timer";
> +               interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) |
> +                             IRQ_TYPE_LEVEL_LOW)>, /* Physical Secure */
> +                            <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) |
> +                             IRQ_TYPE_LEVEL_LOW)>, /* Physical Non-Secure */
> +                            <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) |
> +                             IRQ_TYPE_LEVEL_LOW)>, /* Virtual */
> +                            <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) |
> +                             IRQ_TYPE_LEVEL_LOW)>; /* Hypervisor */
> +               clock-frequency = <12000000>;

Remove this property. The frequency should be read by the driver.

> +               interrupt-parent = <&gic>;
> +       };

Please create an 'soc' node for the SoC to hold all the nodes that have
a reg property.

> +
> +       sys: system-management@...60000 {
> +               compatible = "nuvoton,ma35d1-sys", "syscon", "simple-mfd";
> +               reg = <0x0 0x40460000 0x0 0x200>;
> +
> +               reset: reset-controller {
> +                       compatible = "nuvoton,ma35d1-reset";
> +                       #reset-cells = <1>;
> +               };
> +       };
> +
> +       clk: clock-controller@...60200 {
> +               compatible = "nuvoton,ma35d1-clk", "syscon";
> +               reg = <0x00000000 0x40460200 0x0 0x100>;
> +               #clock-cells = <1>;
> +               clocks = <&clk_hxt>;
> +               nuvoton,sys = <&sys>;
> +       };

It looks like the device at 40460000 is a reset and clock controller.
Just make it one node and register the clk or reset device as an
auxiliary device.

> +
> +       gic: interrupt-controller@...01000 {
> +               compatible = "arm,gic-400";
> +               reg =   <0x0 0x50801000 0 0x1000>, /* GICD */
> +                       <0x0 0x50802000 0 0x2000>, /* GICC */
> +                       <0x0 0x50804000 0 0x2000>, /* GICH */
> +                       <0x0 0x50806000 0 0x2000>; /* GICV */
> +               #interrupt-cells = <3>;
> +               interrupt-parent = <&gic>;
> +               interrupt-controller;
> +               interrupts = <GIC_PPI 9 (GIC_CPU_MASK_RAW(0x13) |
> +                             IRQ_TYPE_LEVEL_HIGH)>;
> +       };
> +
> +       uart0:serial@...00000 {

Add a space after :

> +               compatible = "nuvoton,ma35d1-uart";
> +               reg = <0x0 0x40700000 0x0 0x100>;
> +               interrupts = <GIC_SPI 59 IRQ_TYPE_LEVEL_HIGH>;
> +               clocks = <&clk UART0_GATE>;
> +               status = "disabled";
> +       };