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Date:   Fri, 11 Nov 2022 10:16:43 +0100
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To:     Frank Wunderlich <linux@fw-web.de>,
        linux-mediatek@lists.infradead.org,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>
Cc:     Frank Wunderlich <frank-w@public-files.de>,
        linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20221106085034.12582-1-linux@fw-web.de>
 <20221106085034.12582-12-linux@fw-web.de>
From:   Matthias Brugger <matthias.bgg@gmail.com>
Subject: Re: [RFC v3 11/11] arm64: dts: mt7986: add BPI-R3 nand/nor overlays
In-Reply-To: <20221106085034.12582-12-linux@fw-web.de>
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Rob, Krzysztof,

On 06/11/2022 09:50, Frank Wunderlich wrote:
> From: Frank Wunderlich <frank-w@public-files.de>
> 
> Add devicetree overlays for using nand and nor on BPI-R3.
> 
> Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
> ---
>   arch/arm64/boot/dts/mediatek/Makefile         |  2 +
>   .../mediatek/mt7986a-bananapi-bpi-r3-nand.dts | 53 +++++++++++++++
>   .../mediatek/mt7986a-bananapi-bpi-r3-nor.dts  | 67 +++++++++++++++++++
>   3 files changed, 122 insertions(+)
>   create mode 100644 arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nand.dts
>   create mode 100644 arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nor.dts
> 
> diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dts/mediatek/Makefile
> index e8902f2cc58f..d42208c4090d 100644
> --- a/arch/arm64/boot/dts/mediatek/Makefile
> +++ b/arch/arm64/boot/dts/mediatek/Makefile
> @@ -8,6 +8,8 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += mt6797-x20-dev.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7622-rfb1.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7622-bananapi-bpi-r64.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-emmc.dtb
> +dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-nand.dtbo
> +dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-nor.dtbo

Do we allow the inclusion of overlays in the kernel?
I don't think so. I see there are some dtbos for some freescale platforms, but I 
wasn't aware that we support that. I thought it is all about dtsi includes.

@frank In any case we would need to apply these overlays to some base board to 
create a valis dtb.

Regards,
Matthias

>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-bananapi-bpi-r3-sd.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986a-rfb.dtb
>   dtb-$(CONFIG_ARCH_MEDIATEK) += mt7986b-rfb.dtb
> diff --git a/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nand.dts b/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nand.dts
> new file mode 100644
> index 000000000000..e12ff825bb50
> --- /dev/null
> +++ b/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nand.dts
> @@ -0,0 +1,53 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR MIT) */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +//dtc -O dtb -o bpi-r3-nand.dtbo mt7986a-bananapi-bpi-r3-nand.dts
> +
> +/ {
> +	compatible = "bananapi,bpi-r3", "mediatek,mt7986a";
> +
> +	fragment@0 {
> +		target-path = "/soc/spi@1100a000";
> +		__overlay__ {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			spi_nand: spi_nand@0 {
> +				compatible = "spi-nand";
> +				reg = <0>;
> +				spi-max-frequency = <10000000>;
> +				spi-tx-buswidth = <4>;
> +				spi-rx-buswidth = <4>;
> +
> +				partitions {
> +					compatible = "fixed-partitions";
> +					#address-cells = <1>;
> +					#size-cells = <1>;
> +
> +					partition@0 {
> +						label = "bl2";
> +						reg = <0x0 0x80000>;
> +						read-only;
> +					};
> +
> +					partition@80000 {
> +						label = "reserved";
> +						reg = <0x80000 0x300000>;
> +					};
> +
> +					partition@380000 {
> +						label = "fip";
> +						reg = <0x380000 0x200000>;
> +						read-only;
> +					};
> +
> +					partition@580000 {
> +						label = "ubi";
> +						reg = <0x580000 0x7a80000>;
> +					};
> +				};
> +			};
> +		};
> +	};
> +};
> diff --git a/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nor.dts b/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nor.dts
> new file mode 100644
> index 000000000000..f11ffd9c4bce
> --- /dev/null
> +++ b/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3-nor.dts
> @@ -0,0 +1,67 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR MIT) */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +//dtc -O dtb -o bpi-r3-nor.dtbo mt7986a-bananapi-bpi-r3-nor.dts
> +
> +/ {
> +	compatible = "bananapi,bpi-r3", "mediatek,mt7986a";
> +
> +	fragment@0 {
> +		target-path = "/soc/spi@1100a000";
> +		__overlay__ {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			flash@0 {
> +				compatible = "jedec,spi-nor";
> +				reg = <0>;
> +				spi-max-frequency = <10000000>;
> +
> +				partitions {
> +					compatible = "fixed-partitions";
> +					#address-cells = <1>;
> +					#size-cells = <1>;
> +
> +					partition@0 {
> +						label = "bl2";
> +						reg = <0x0 0x20000>;
> +						read-only;
> +					};
> +
> +					partition@20000 {
> +						label = "reserved";
> +						reg = <0x20000 0x20000>;
> +					};
> +
> +					partition@40000 {
> +						label = "u-boot-env";
> +						reg = <0x40000 0x40000>;
> +					};
> +
> +					partition@80000 {
> +						label = "reserved2";
> +						reg = <0x80000 0x80000>;
> +					};
> +
> +					partition@100000 {
> +						label = "fip";
> +						reg = <0x100000 0x80000>;
> +						read-only;
> +					};
> +
> +					partition@180000 {
> +						label = "recovery";
> +						reg = <0x180000 0xa80000>;
> +					};
> +
> +					partition@c00000 {
> +						label = "fit";
> +						reg = <0xc00000 0x1400000>;
> +						compatible = "denx,fit";
> +					};
> +				};
> +			};
> +		};
> +	};
> +};