linux-kernel - Re: [PATCH v2 3/3] arm64: dts: add imx8mp-libra-rdk-fpsc LVDS panel overlay

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Message-ID: <Z+7UAzFYCHYij0AA@lizhi-Precision-Tower-5810>
Date: Thu, 3 Apr 2025 14:31:31 -0400
From: Frank Li <Frank.li@....com>
To: Yannic Moog <y.moog@...tec.de>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, upstream@...ts.phytec.de,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	Benjamin Hahn <b.hahn@...tec.de>, Jan Remmet <j.remmet@...tec.de>,
	Teresa Remmet <t.remmet@...tec.de>,
	Yashwanth Varakala <y.varakala@...tec.de>
Subject: Re: [PATCH v2 3/3] arm64: dts: add imx8mp-libra-rdk-fpsc LVDS panel
 overlay

On Thu, Apr 03, 2025 at 01:29:29PM +0200, Yannic Moog wrote:
> The Libra board has an LVDS connector. Add an overlay for an
> etml1010g3dra LVDS panel supported for the phyCORE-i.MX 8M Plus that may
> be connected to it.
>
> Signed-off-by: Yannic Moog <y.moog@...tec.de>
> ---
>  arch/arm64/boot/dts/freescale/Makefile             |  2 +
>  .../imx8mp-libra-rdk-fpsc-lvds-etml1010g3dra.dtso  | 44 ++++++++++++++++++++++
>  2 files changed, 46 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
> index df792553be479afcb6fa50dcd25a7eb63b67bc44..aa349ee35d5b310512f05c92390d5c2a27df81bb 100644
> --- a/arch/arm64/boot/dts/freescale/Makefile
> +++ b/arch/arm64/boot/dts/freescale/Makefile
> @@ -201,6 +201,8 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mp-kontron-dl.dtb
>
>  dtb-$(CONFIG_ARCH_MXC) += imx8mp-kontron-smarc-eval-carrier.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mp-libra-rdk-fpsc.dtb
> +imx8mp-libra-rdk-fpsc-lvds-dtbs += imx8mp-libra-rdk-fpsc.dtb imx8mp-libra-rdk-fpsc-lvds-etml1010g3dra.dtbo
> +dtb-$(CONFIG_ARCH_MXC) += imx8mp-libra-rdk-fpsc-lvds.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mp-msc-sm2s-ep1.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mp-navqp.dtb
>  dtb-$(CONFIG_ARCH_MXC) += imx8mp-nitrogen-smarc-universal-board.dtb
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-libra-rdk-fpsc-lvds-etml1010g3dra.dtso b/arch/arm64/boot/dts/freescale/imx8mp-libra-rdk-fpsc-lvds-etml1010g3dra.dtso
> new file mode 100644
> index 0000000000000000000000000000000000000000..1dcf249ca90d2b4d9720a55de39e3f8564780dc3
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-libra-rdk-fpsc-lvds-etml1010g3dra.dtso
> @@ -0,0 +1,44 @@
> +// SPDX-License-Identifier: (GPL-2.0-or-later OR MIT)
> +/*
> + * Copyright (C) 2025 PHYTEC Messtechnik GmbH
> + */
> +
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/clock/imx8mp-clock.h>
> +
> +/dts-v1/;
> +/plugin/;
> +
> +&backlight_lvds0 {
> +	brightness-levels = <0 8 16 32 64 128 255>;
> +	default-brightness-level = <8>;
> +	enable-gpios = <&gpio5 23 GPIO_ACTIVE_LOW>;
> +	num-interpolated-steps = <2>;
> +	pwms = <&pwm1 0 66667 0>;
> +	status = "okay";
> +};
> +
> +&lcdif2 {
> +	status = "okay";
> +};
> +
> +&lvds_bridge {
> +	assigned-clocks = <&clk IMX8MP_CLK_MEDIA_LDB>, <&clk IMX8MP_VIDEO_PLL1>;
> +	assigned-clock-parents = <&clk IMX8MP_VIDEO_PLL1_OUT>;
> +	/*
> +	 * The LVDS panel uses 72.4 MHz pixel clock, set IMX8MP_VIDEO_PLL1 to
> +	 * 72.4 * 7 = 506.8 MHz so the LDB serializer and LCDIFv3 scanout
> +	 * engine can reach accurate pixel clock of exactly 72.4 MHz.
> +	 */
> +	assigned-clock-rates = <0>, <506800000>;

why assin IMX8MP_CLK_MEDIA_LDB rate to 0?

Frank
> +	status = "okay";
> +};
> +
> +&panel0_lvds {
> +	compatible = "edt,etml1010g3dra";
> +	status = "okay";
> +};
> +
> +&pwm1 {
> +	status = "okay";
> +};
>
> --
> 2.49.0
>