linux-kernel - Re: [PATCH] arm64: dts: qcom: ipq9574: Enable eMMC variant

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Message-ID: <e00630b9-56f0-4a30-84ef-8b691ea7af3e@kernel.org>
Date: Fri, 2 Jan 2026 12:08:03 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Varadarajan Narayanan <varadarajan.narayanan@....qualcomm.com>,
 andersson@...nel.org, konradybcio@...nel.org, robh@...nel.org,
 krzk+dt@...nel.org, conor+dt@...nel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: sumit.garg@...nel.org
Subject: Re: [PATCH] arm64: dts: qcom: ipq9574: Enable eMMC variant

On 02/01/2026 11:46, Varadarajan Narayanan wrote:
> RDP433 can have NAND or eMMC based on a board level rework. Since the
> same GPIOS are used for both the interfaces, only one of them can be
> used. Add a new DTS file to disable NAND and enable eMMC.
> 
> Signed-off-by: Varadarajan Narayanan <varadarajan.narayanan@....qualcomm.com>
> ---
>  arch/arm64/boot/dts/qcom/Makefile             |  2 +-
>  .../boot/dts/qcom/ipq9574-rdp-common.dtsi     | 32 +++++++++++++++++++
>  .../boot/dts/qcom/ipq9574-rdp433-emmc.dts     | 26 +++++++++++++++
>  3 files changed, 59 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm64/boot/dts/qcom/ipq9574-rdp433-emmc.dts
> 
> diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
> index 6f34d5ed331c..d5fe12ef4300 100644
> --- a/arch/arm64/boot/dts/qcom/Makefile
> +++ b/arch/arm64/boot/dts/qcom/Makefile
> @@ -26,7 +26,7 @@ dtb-$(CONFIG_ARCH_QCOM)	+= ipq8074-hk01.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= ipq8074-hk10-c1.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= ipq8074-hk10-c2.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= ipq9574-rdp418.dtb
> -dtb-$(CONFIG_ARCH_QCOM)	+= ipq9574-rdp433.dtb
> +dtb-$(CONFIG_ARCH_QCOM)	+= ipq9574-rdp433.dtb ipq9574-rdp433-emmc.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= ipq9574-rdp449.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= ipq9574-rdp453.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= ipq9574-rdp454.dtb
> diff --git a/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi b/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi
> index bdb396afb992..e4ae79b2fcd9 100644
> --- a/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi
> @@ -169,6 +169,38 @@ data-pins {
>  			bias-disable;
>  		};
>  	};
> +
> +	sdc_default_state: sdc-default-state {
> +		clk-pins {
> +			pins = "gpio5";
> +			function = "sdc_clk";
> +			drive-strength = <8>;
> +			bias-disable;
> +		};
> +
> +		cmd-pins {
> +			pins = "gpio4";
> +			function = "sdc_cmd";
> +			drive-strength = <8>;
> +			bias-pull-up;
> +		};
> +
> +		data-pins {
> +			pins = "gpio0", "gpio1", "gpio2",
> +			       "gpio3", "gpio6", "gpio7",
> +			       "gpio8", "gpio9";
> +			function = "sdc_data";
> +			drive-strength = <8>;
> +			bias-pull-up;
> +		};
> +
> +		rclk-pins {
> +			pins = "gpio10";
> +			function = "sdc_rclk";
> +			drive-strength = <8>;
> +			bias-pull-down;
> +		};
> +	};
>  };
>  
>  &qpic_bam {
> diff --git a/arch/arm64/boot/dts/qcom/ipq9574-rdp433-emmc.dts b/arch/arm64/boot/dts/qcom/ipq9574-rdp433-emmc.dts
> new file mode 100644
> index 000000000000..ffd96b1b1c65
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/ipq9574-rdp433-emmc.dts
> @@ -0,0 +1,26 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)

Odd license. We don't take GPL v3.

> +/*
> + * IPQ9574 RDP433 eMMC board variant device tree source
> + *
> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
> + */
> +
> +/dts-v1/;
> +
> +#include "ipq9574-rdp433.dts"

I find it discouraged practice. Although if Bjorn is fine with it, you
still need proper compatibles.


Best regards,
Krzysztof