linux-kernel - Re: [PATCH] arm64: dts: rockchip: Add overlay for the PCIe slot on RK3576 EVB1

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Message-ID: <CABjd4YxiOsw0_vR=igLhGkXUp4kSfx_eWv6j=FrsX-qo5sR2hw@mail.gmail.com>
Date: Mon, 1 Dec 2025 21:35:07 +0400
From: Alexey Charkov <alchark@...il.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: rockchip: Add overlay for the PCIe slot on
 RK3576 EVB1

On Mon, Dec 1, 2025 at 4:37 PM Alexey Charkov <alchark@...il.com> wrote:
>
> Rockchip RK3576 EVB1 has an onboard PCIe slot (PCIe 2.1, x4 mechanically,
> x1 electrically), but it shares pins and PHY with the only USB3 Type-A
> port.
>
> There is a physical switch next to the slot to transfer respective pins
> connection from the USB3 port to the PCIe slot, but apart from flipping
> the switch one must also disable the USB3 host controller to prevent it
> from claiming the PHY before the PCIe slot can become usable.
>
> Add an overlay to disable the USB3 host port and instead enable the
> PCIe slot, along with its pin configs. The physical switch must still be
> flipped to the "ON - PCIe1" position for this to work.
>
> Signed-off-by: Alexey Charkov <alchark@...il.com>
> ---
>  arch/arm64/boot/dts/rockchip/Makefile              |  4 +++
>  .../boot/dts/rockchip/rk3576-evb1-v10-pcie1.dtso   | 31 ++++++++++++++++++++++
>  2 files changed, 35 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/rockchip/Makefile b/arch/arm64/boot/dts/rockchip/Makefile
> index ad684e3831bc..63198a618a2b 100644
> --- a/arch/arm64/boot/dts/rockchip/Makefile
> +++ b/arch/arm64/boot/dts/rockchip/Makefile
> @@ -252,6 +252,10 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3576-armsom-sige5-v1.2-wifibt.dtb
>  rk3576-armsom-sige5-v1.2-wifibt-dtbs := rk3576-armsom-sige5.dtb \
>         rk3576-armsom-sige5-v1.2-wifibt.dtbo
>
> +dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3576-evb1-v10-pcie1.dtb
> +rk3576-evb1-v10-pcie1-dtbs := rk3576-evb1-v10.dtb \
> +       rk3576-evb1-v10-pcie1.dtbo

Missed the separate .dtbo target. Will amend in v2. Should have
something like this further up in the Makefile:
dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3576-evb1-v10-pcie1.dtbo

Best regards,
Alexey