linux-kernel - Re: [PATCH v2 4/4] ARM: dts: qcom: Add Samsung Galaxy Express support

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Message-ID: <3f2eefcc-fb0b-d374-995d-3c0b7e4b4507@linaro.org>
Date:   Tue, 30 May 2023 15:24:15 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Rudraksha Gupta <guptarud@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Olof Johansson <olof@...om.net>,
        soc@...nel.org
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 4/4] ARM: dts: qcom: Add Samsung Galaxy Express support

Thank you for your patch. There is something to discuss/improve.



On 28/05/2023 02:10, Rudraksha Gupta wrote:
> This adds a very basic device tree file for the Samsung Galaxy Express

Please do not use "This commit/patch", but imperative mood. See longer
explanation here:
https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95


> SGH-I437. Currently, the following things work: UART, eMMC, SD Card, and
> USB.
> 
> Signed-off-by: Rudraksha Gupta <guptarud@...il.com>
> ---
>  arch/arm/boot/dts/Makefile                    |   1 +
>  .../dts/qcom-msm8960-samsung-expressatt.dts   | 334 ++++++++++++++++++
>  2 files changed, 335 insertions(+)
>  create mode 100644 arch/arm/boot/dts/qcom-msm8960-samsung-expressatt.dts
> 
> diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
> index 59829fc90315..12c90f263142 100644
> --- a/arch/arm/boot/dts/Makefile
> +++ b/arch/arm/boot/dts/Makefile
> @@ -1081,6 +1081,7 @@ dtb-$(CONFIG_ARCH_QCOM) += \
>  	qcom-msm8916-samsung-grandmax.dtb \
>  	qcom-msm8916-samsung-serranove.dtb \
>  	qcom-msm8960-cdp.dtb \
> +	qcom-msm8960-samsung-expressatt.dtb \
>  	qcom-msm8974-lge-nexus5-hammerhead.dtb \
>  	qcom-msm8974-sony-xperia-rhine-amami.dtb \
>  	qcom-msm8974-sony-xperia-rhine-honami.dtb \
> diff --git a/arch/arm/boot/dts/qcom-msm8960-samsung-expressatt.dts b/arch/arm/boot/dts/qcom-msm8960-samsung-expressatt.dts
> new file mode 100644
> index 000000000000..a1ee9c272558
> --- /dev/null
> +++ b/arch/arm/boot/dts/qcom-msm8960-samsung-expressatt.dts
> @@ -0,0 +1,334 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include <dt-bindings/input/input.h>
> +
> +#include "qcom-msm8960.dtsi"
> +#include <dt-bindings/reset/qcom,gcc-msm8960.h>
> +
> +/ {
> +	model = "Samsung Galaxy Express SGH-I437";
> +	compatible = "samsung,expressatt", "qcom,msm8960";
> +	chassis-type = "handset";
> +
> +	aliases {
> +		serial0 = &gsbi5_serial;
> +		mmc0 = &sdcc1; /* SDCC1 eMMC slot */
> +		mmc1 = &sdcc3; /* SDCC3 SD card slot */
> +	};
> +
> +	chosen {
> +		stdout-path = "serial0:115200n8";
> +	};
> +};
> +
> +&gsbi5 {
> +	qcom,mode = <GSBI_PROT_I2C_UART>;
> +	status = "okay";
> +};
> +
> +&gsbi5_serial {
> +	status = "okay";
> +};
> +
> +&sdcc1 {
> +	vmmc-supply = <&pm8921_l5>;
> +	status = "okay";
> +};
> +
> +&sdcc3 {
> +	vmmc-supply = <&pm8921_l6>;
> +	vqmmc-supply = <&pm8921_l7>;
> +	status = "okay";
> +};
> +
> +&gsbi1 {
> +	qcom,mode = <GSBI_PROT_SPI>;
> +	pinctrl-0 = <&spi1_default>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +};
> +
> +&gsbi1_spi {
> +	status = "okay";
> +};
> +
> +&msmgpio {
> +	spi1_default: spi1_default {

No underscores in node names, missing proper suffix.

It does not look like you tested the DTS against bindings. Please run
`make dtbs_check` (see
Documentation/devicetree/bindings/writing-schema.rst for instructions).

> +		mux {

It does not look like you tested the DTS against bindings. Please run
`make dtbs_check` (see
Documentation/devicetree/bindings/writing-schema.rst for instructions).

> +			pins = "gpio6", "gpio7", "gpio9";
> +			function = "gsbi1";
> +		};
> +
> +		mosi {

It does not look like you tested the DTS against bindings. Please run
`make dtbs_check` (see
Documentation/devicetree/bindings/writing-schema.rst for instructions).

> +			pins = "gpio6";
> +			drive-strength = <12>;
> +			bias-disable;
> +		};
> +
> +		miso {
> +			pins = "gpio7";
> +			drive-strength = <12>;
> +			bias-disable;
> +		};
> +
> +		cs {
> +			pins = "gpio8";
> +			drive-strength = <12>;
> +			bias-disable;
> +			output-low;
> +		};
> +
> +		clk {
> +			pins = "gpio9";
> +			drive-strength = <12>;
> +			bias-disable;
> +		};
> +	};
> +};
> +
> +

One blank line, not two.

...

> +&usb1 {
> +	dr_mode = "otg";
> +	status = "okay";
> +};
> +

No improvements here.

Best regards,
Krzysztof