linux-kernel - Re: [PATCH 4/5] arm64: dts: qcom: ipq9574: Add SPI nand support

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Date: Fri, 16 Feb 2024 21:10:28 +0530
From: Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
To: Md Sadre Alam <quic_mdalam@...cinc.com>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <broonie@...nel.org>, <robh@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <manivannan.sadhasivam@...aro.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>
CC: <quic_srichara@...cinc.com>, <quic_varada@...cinc.com>
Subject: Re: [PATCH 4/5] arm64: dts: qcom: ipq9574: Add SPI nand support



On 2/15/2024 7:18 PM, Md Sadre Alam wrote:
> Add SPI NAND support for ipq9574 SoC.
> 
> Signed-off-by: Md Sadre Alam <quic_mdalam@...cinc.com>
> ---
>   .../boot/dts/qcom/ipq9574-rdp-common.dtsi     | 43 +++++++++++++++++++
>   arch/arm64/boot/dts/qcom/ipq9574.dtsi         | 27 ++++++++++++
>   2 files changed, 70 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi b/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi
> index 91e104b0f865..5b54a027fa5d 100644
> --- a/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq9574-rdp-common.dtsi
> @@ -139,6 +139,49 @@ gpio_leds_default: gpio-leds-default-state {
>   		drive-strength = <8>;
>   		bias-pull-up;
>   	};
> +
> +	qpic_snand_default_state: qpic-snand-default-state {
> +		clock-pins {
> +			pins = "gpio5";
> +			function = "qspi_clk";
> +			drive-strength = <8>;
> +			bias-disable;
> +		};
> +
> +		cs-pins {
> +			pins = "gpio4";
> +			function = "qspi_cs";
> +			drive-strength = <8>;
> +			bias-disable;
> +		};
> +
> +		data-pins {
> +			pins = "gpio0", "gpio1", "gpio2";


As per the pinctrl driver[1], there are 4 data pins.

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pinctrl/qcom/pinctrl-ipq9574.c#n296


> +			function = "qspi_data";
> +			drive-strength = <8>;
> +			bias-disable;
> +		};
> +	};
> +};
> +
> +&qpic_bam {
> +	status = "okay";
> +};
> +
> +&qpic_nand {
> +	pinctrl-0 = <&qpic_snand_default_state>;
> +	pinctrl-names = "default";
> +	status = "okay";
> +
> +	flash@0 {
> +		compatible = "spi-nand";
> +		reg = <0>;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		nand-ecc-engine = <&qpic_nand>;
> +		nand-ecc-strength = <4>;
> +		nand-ecc-step-size = <512>;
> +	};
>   };
>   
>   &usb_0_dwc3 {
> diff --git a/arch/arm64/boot/dts/qcom/ipq9574.dtsi b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> index 7f2e5cbf3bbb..d963dd2035dd 100644
> --- a/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> +++ b/arch/arm64/boot/dts/qcom/ipq9574.dtsi
> @@ -319,6 +319,33 @@ tcsr: syscon@...7000 {
>   			reg = <0x01937000 0x21000>;
>   		};
>   
> +		qpic_bam: dma-controller@...4000 {


Nodes should be ordered by unit address in ascending order. So please 
move these nodes to the right place.


> +			compatible = "qcom,bam-v1.7.0";
> +			reg = <0x7984000 0x1c000>;


address should be padded to 8 bytes.

> +			interrupts = <GIC_SPI 146 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&gcc GCC_QPIC_AHB_CLK>;
> +			clock-names = "bam_clk";
> +			#dma-cells = <1>;
> +			qcom,ee = <0>;
> +			status = "disabled";
> +		};
> +
> +		qpic_nand: spi@...0000 {
> +			compatible = "qcom,ipq9574-snand";
> +			reg = <0x79b0000 0x10000>;


Ditto..

> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			clocks = <&gcc GCC_QPIC_CLK>,
> +			<&gcc GCC_QPIC_AHB_CLK>,
> +			<&gcc GCC_QPIC_IO_MACRO_CLK>;


Fix the alignment.

> +			clock-names = "core", "aon", "iom";
> +			dmas = <&qpic_bam 0>,
> +				<&qpic_bam 1>,
> +				<&qpic_bam 2>;


Here as well.


> +			dma-names = "tx", "rx", "cmd";
> +			status = "disabled";
> +		};
> +
>   		sdhc_1: mmc@...4000 {
>   			compatible = "qcom,ipq9574-sdhci", "qcom,sdhci-msm-v5";
>   			reg = <0x07804000 0x1000>,