linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: ipq9574: add support for RDP454 variant

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Message-ID: <8a5df35a-2429-3880-6a1e-795c13c3b3d1@linaro.org>
Date:   Fri, 19 May 2023 19:31:57 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Poovendhan Selvaraj <quic_poovendh@...cinc.com>, agross@...nel.org,
        andersson@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     quic_srichara@...cinc.com, quic_gokulsri@...cinc.com,
        quic_sjaganat@...cinc.com, quic_kathirav@...cinc.com,
        quic_arajkuma@...cinc.com, quic_anusha@...cinc.com,
        quic_devipriy@...cinc.com
Subject: Re: [PATCH 2/2] arm64: dts: qcom: ipq9574: add support for RDP454
 variant



On 19.05.2023 12:31, Poovendhan Selvaraj wrote:
> From: POOVENDHAN SELVARAJ <quic_poovendh@...cinc.com>
> 
> Add the initial device tree support for the Reference Design Platform (RDP)
> 454 based on IPQ9574 family of SoCs. This patch adds support for Console
> UART, SPI NOR and SMPA1 regulator node.
> 
> Signed-off-by: Poovendhan Selvaraj <quic_poovendh@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/Makefile           |  1 +
>  arch/arm64/boot/dts/qcom/ipq9574-rdp454.dts | 92 +++++++++++++++++++++
>  2 files changed, 93 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/qcom/ipq9574-rdp454.dts
> 
> diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
> index 7b5466395f46..834e790bec90 100644
> --- a/arch/arm64/boot/dts/qcom/Makefile
> +++ b/arch/arm64/boot/dts/qcom/Makefile
> @@ -12,6 +12,7 @@ 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-rdp449.dtb
> +dtb-$(CONFIG_ARCH_QCOM)	+= ipq9574-rdp454.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-acer-a1-724.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-alcatel-idol347.dtb
>  dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-asus-z00l.dtb
> diff --git a/arch/arm64/boot/dts/qcom/ipq9574-rdp454.dts b/arch/arm64/boot/dts/qcom/ipq9574-rdp454.dts
> new file mode 100644
> index 000000000000..b3e853a9cc94
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/ipq9574-rdp454.dts
> @@ -0,0 +1,92 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
> +/*
> + * IPQ9574 RDP454 board device tree source
> + *
> + * Copyright (c) 2020-2021 The Linux Foundation. All rights reserved.
> + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +/dts-v1/;
> +
> +#include "ipq9574.dtsi"
> +
> +/ {
> +	model = "Qualcomm Technologies, Inc. IPQ9574/AP-AL02-C9";
> +	compatible = "qcom,ipq9574-ap-al02-c9", "qcom,ipq9574";
> +
> +	aliases {
> +		serial0 = &blsp1_uart2;
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};
> +};
> +
> +/* In AL02-C9, the max supported CPU Freq is 1.5 GHz. Disabling frequencies beyond 1.5GHz*/
In -> On

GHz*/ -> GHz */

Disabling -> Disable

Can this not be determined based on fuse values?

> +&cpu_opp_table {
> +	opp-1800000000 {
> +		opp-supported-hw = <0>;
> +	};
> +
> +	opp-2208000000 {
> +		opp-supported-hw = <0>;
> +	};
> +};
> +
> +/* Disable IPQ9574 integrated radio's reserved memory */
?

Konrad
> +&blsp1_spi0 {
> +	pinctrl-0 = <&spi_0_pins>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +
> +	flash@0 {
> +		compatible = "micron,n25q128a11", "jedec,spi-nor";
> +		reg = <0>;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		spi-max-frequency = <50000000>;
> +	};
> +};
> +
> +&blsp1_uart2 {
> +	pinctrl-0 = <&uart2_pins>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +};
> +
> +&rpm_requests {
> +	regulators {
> +		compatible = "qcom,rpm-mp5496-regulators";
> +
> +		ipq9574_s1: s1 {
> +		/*
> +		 * During kernel bootup, the SoC runs at 800MHz with 875mV set by the bootloaders.
> +		 * During regulator registration, kernel not knowing the initial voltage,
> +		 * considers it as zero and brings up the regulators with minimum supported voltage.
> +		 * Update the regulator-min-microvolt with SVS voltage of 725mV so that
> +		 * the regulators are brought up with 725mV which is sufficient for all the
> +		 * corner parts to operate at 800MHz
> +		 */
> +			regulator-min-microvolt = <725000>;
> +			regulator-max-microvolt = <1075000>;
> +		};
> +	};
> +};
> +
> +&sleep_clk {
> +	clock-frequency = <32000>;
> +};
> +
> +&tlmm {
> +	spi_0_pins: spi-0-state {
> +		pins = "gpio11", "gpio12", "gpio13", "gpio14";
> +		function = "blsp0_spi";
> +		drive-strength = <8>;
> +		bias-disable;
> +	};
> +};
> +
> +&xo_board_clk {
> +	clock-frequency = <24000000>;
> +};