linux-kernel - Re: [PATCH v2 04/12] riscv: dts: allwinner: Add the D1/D1s SoC devicetree

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Message-ID: <Y4I45Uu6eFKUo69B@spud>
Date:   Sat, 26 Nov 2022 16:03:49 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Samuel Holland <samuel@...lland.org>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        linux-sunxi@...ts.linux.dev, Palmer Dabbelt <palmer@...belt.com>,
        linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Jisheng Zhang <jszhang@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Andre Przywara <andre.przywara@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <apatel@...tanamicro.com>,
        Atish Patra <atishp@...osinc.com>,
        Christian Hewitt <christianshewitt@...il.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Guo Ren <guoren@...nel.org>,
        Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Stanislav Jakubek <stano.jakubek@...il.com>
Subject: Re: [PATCH v2 04/12] riscv: dts: allwinner: Add the D1/D1s SoC
 devicetree

On Fri, Nov 25, 2022 at 05:46:48PM -0600, Samuel Holland wrote:
> D1 (aka D1-H), D1s (aka F133), R528, and T113 are a family of SoCs based
> on a single die, or at a pair of dies derived from the same design.
> 
> D1 and D1s contain a single T-HEAD Xuantie C906 CPU, whereas R528 and
> T113 contain a pair of Cortex-A7's.

Is this "additionally contain" or a case of the D1 is the R528 but with
s/arm/riscv/? It's the latter, right?

> D1 and R528 are the full version of
> the chip with a BGA package, whereas D1s and T113 are low-pin-count QFP
> variants.
> 
> Because the original design supported both ARM and RISC-V CPUs, some
> peripherals are duplicated. In addition, all variants except D1s contain
> a HiFi 4 DSP with its own set of peripherals.
> 
> The devicetrees are organized to minimize duplication:
>  - Common perhiperals are described in sunxi-d1s-t113.dtsi
>  - DSP-related peripherals are described in sunxi-d1-t113.dtsi
>  - RISC-V specific hardware is described in sun20i-d1s.dtsi
>  - Functionality unique to the D1 variant is described in sun20i-d1.dtsi
> 
> The SOC_PERIPHERAL_IRQ macro handles the different #interrupt-cells
> values between the ARM (GIC) and RISC-V (PLIC) versions of the SoC.

Modulo the warnings I replied to the cover with & one minor comment
below:
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

> Signed-off-by: Samuel Holland <samuel@...lland.org>
> ---
> 
> Changes in v2:
>  - Split into separate files for sharing with D1s/R528/T113
>  - Use SOC_PERIPHERAL_IRQ macro for interrupts
>  - Rename osc24M to dcxo and move the frequency to the board DTs
>  - Drop analog LDOs due to the missing binding
>  - Correct tcon_top DSI clock reference
>  - Add DMIC, DSI controller, and DPHY (bindings are in linux-next)
>  - Add CPU OPP table
> 
>  arch/riscv/boot/dts/allwinner/sun20i-d1.dtsi  |  66 ++
>  arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi |  76 ++
>  .../boot/dts/allwinner/sunxi-d1-t113.dtsi     |  15 +
>  .../boot/dts/allwinner/sunxi-d1s-t113.dtsi    | 844 ++++++++++++++++++
>  4 files changed, 1001 insertions(+)
>  create mode 100644 arch/riscv/boot/dts/allwinner/sun20i-d1.dtsi
>  create mode 100644 arch/riscv/boot/dts/allwinner/sun20i-d1s.dtsi
>  create mode 100644 arch/riscv/boot/dts/allwinner/sunxi-d1-t113.dtsi
>  create mode 100644 arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi


> diff --git a/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi b/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi
> new file mode 100644
> index 000000000000..c8815cbf0b46
> --- /dev/null
> +++ b/arch/riscv/boot/dts/allwinner/sunxi-d1s-t113.dtsi
> @@ -0,0 +1,844 @@
> +// SPDX-License-Identifier: (GPL-2.0+ or MIT)
> +// Copyright (C) 2021-2022 Samuel Holland <samuel@...lland.org>
> +
> +#include <dt-bindings/clock/sun6i-rtc.h>
> +#include <dt-bindings/clock/sun8i-de2.h>
> +#include <dt-bindings/clock/sun8i-tcon-top.h>
> +#include <dt-bindings/clock/sun20i-d1-ccu.h>
> +#include <dt-bindings/clock/sun20i-d1-r-ccu.h>
> +#include <dt-bindings/interrupt-controller/irq.h>
> +#include <dt-bindings/reset/sun8i-de2.h>
> +#include <dt-bindings/reset/sun20i-d1-ccu.h>
> +#include <dt-bindings/reset/sun20i-d1-r-ccu.h>
> +
> +/ {
> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +
> +	dcxo: dcxo-clk {
> +		compatible = "fixed-clock";
> +		/* This value must be overridden by the board */
> +		clock-frequency = <0>;

Since this is a "must", can you drop the clock-frequency = <0> here so
that if someone doesn't override it in their board dt-validate
complains?

Thanks,
Conor.

> +		clock-output-names = "dcxo";
> +		#clock-cells = <0>;
> +	};
> +