linux-kernel - Re: [PATCH 7/7] arm64: dts: exynos: Add initial E850-96 board support

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Message-ID: <b998809c-9d33-cd42-ebfd-7cce620a6ed8@canonical.com>
Date:   Wed, 15 Dec 2021 18:04:46 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Sam Protsenko <semen.protsenko@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:     Jaewon Kim <jaewon02.kim@...sung.com>,
        Chanho Park <chanho61.park@...sung.com>,
        David Virag <virag.david003@...il.com>,
        Youngmin Nam <youngmin.nam@...sung.com>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Daniel Palmer <daniel@...f.com>,
        Hao Fang <fanghao11@...wei.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: Re: [PATCH 7/7] arm64: dts: exynos: Add initial E850-96 board support

On 15/12/2021 17:09, Sam Protsenko wrote:
> E850-96 is a 96boards development board manufactured by WinLink. It
> incorporates Samsung Exynos850 SoC, and is compatible with 96boards
> mezzanine boards [1], as it follows 96boards standards.
> 
> This patch adds minimal support for E850-96 board. Next features are
> enabled in board dts file and verified with minimal BusyBox rootfs:
> 
>  * User buttons
>  * LEDs
>  * Serial console
>  * Watchdog timers
>  * RTC
>  * eMMC
> 
> [1] https://www.96boards.org/products/mezzanine/
> 
> Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
> ---
>  arch/arm64/boot/dts/exynos/Makefile           |   3 +-
>  .../boot/dts/exynos/exynos850-e850-96.dts     | 157 ++++++++++++++++++
>  2 files changed, 159 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm64/boot/dts/exynos/exynos850-e850-96.dts
> 
> diff --git a/arch/arm64/boot/dts/exynos/Makefile b/arch/arm64/boot/dts/exynos/Makefile
> index b41e86df0a84..803548ccc537 100644
> --- a/arch/arm64/boot/dts/exynos/Makefile
> +++ b/arch/arm64/boot/dts/exynos/Makefile
> @@ -3,4 +3,5 @@ dtb-$(CONFIG_ARCH_EXYNOS) += \
>  	exynos5433-tm2.dtb	\
>  	exynos5433-tm2e.dtb	\
>  	exynos7-espresso.dtb	\
> -	exynosautov9-sadk.dtb
> +	exynosautov9-sadk.dtb	\
> +	exynos850-e850-96.dtb
> diff --git a/arch/arm64/boot/dts/exynos/exynos850-e850-96.dts b/arch/arm64/boot/dts/exynos/exynos850-e850-96.dts
> new file mode 100644
> index 000000000000..fd611906d81c
> --- /dev/null
> +++ b/arch/arm64/boot/dts/exynos/exynos850-e850-96.dts
> @@ -0,0 +1,157 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * WinLink E850-96 board device tree source
> + *
> + * Copyright (C) 2018 Samsung Electronics Co., Ltd.
> + * Copyright (C) 2021 Linaro Ltd.
> + *
> + * Device tree source file for WinLink's E850-96 board which is based on
> + * Samsung Exynos850 SoC.
> + */
> +
> +/dts-v1/;
> +
> +#include "exynos850.dtsi"
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/input/input.h>
> +
> +#define BOARD_ID	0x0
> +#define BOARD_REV	0x2
> +
> +/ {
> +	model = "WinLink E850-96 board";
> +	compatible = "winlink,e850-96", "samsung,exynos850";
> +	board_id = <BOARD_ID>;
> +	board_rev = <BOARD_REV>;
> +
> +	chosen {
> +		stdout-path = &serial_0;
> +	};
> +

You did not define memory node. Do you expect bootloader to fill it?
Does it change between different boards?


Best regards,
Krzysztof