linux-kernel - Re: [PATCH v3 4/4] arm64: dts: qcom: ipq9574: Enable eMMC variant

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Message-ID: <f5af2b4f-e2dc-4aec-99c1-f06ef0eaa000@oss.qualcomm.com>
Date: Thu, 29 Jan 2026 13:25:44 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
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-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org
Cc: sumit.garg@....qualcomm.com, dmitry.baryshkov@....qualcomm.com
Subject: Re: [PATCH v3 4/4] arm64: dts: qcom: ipq9574: Enable eMMC variant

On 1/29/26 7:28 AM, 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>
> ---
> v3: As qpic_nand is disabled in ipq9574-rdp-common.dtsi, no need to disable
>     it here. Just enable eMMC.
> ---
>  arch/arm64/boot/dts/qcom/Makefile             |  2 +-
>  .../boot/dts/qcom/ipq9574-rdp433-emmc.dts     | 29 +++++++++++++++++++
>  2 files changed, 30 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-rdp433-emmc.dts b/arch/arm64/boot/dts/qcom/ipq9574-rdp433-emmc.dts
> new file mode 100644
> index 000000000000..249b8e07db8f
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/ipq9574-rdp433-emmc.dts
> @@ -0,0 +1,29 @@
> +// SPDX-License-Identifier: BSD-3-Clause-Clear
> +/*
> + * IPQ9574 RDP433 (eMMC variant) board device tree source
> + *
> + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
> + */
> +
> +/dts-v1/;
> +
> +#include "ipq9574-rdp-common.dtsi"
> +#include "ipq9574-rdp433-common.dtsi"
> +
> +/ {
> +	model = "Qualcomm Technologies, Inc. IPQ9574/AP-AL02-C7 (eMMC)";
> +	compatible = "qcom,ipq9574-ap-al02-c7-emmc", "qcom,ipq9574";
> +};
> +
> +&sdhc_1 {
> +	pinctrl-0 = <&sdc_default_state>;
> +	pinctrl-names = "default";
> +	mmc-ddr-1_8v;
> +	mmc-hs200-1_8v;
> +	mmc-hs400-1_8v;
> +	mmc-hs400-enhanced-strobe;
> +	max-frequency = <384000000>;

These are all properties of the controller, which the mmc core
later validates against the properties of the card, please move them
to the SoC DTSI

> +	bus-width = <8>;

This is arguably a property of the board, but in reality it's so
common that it may as well reside in the SoC dtsi too

I'm a little surprised to see no power supplies, are they always-on?

Konrad