linux-kernel - Re: [PATCH v2 1/2] ARM: dts: imx7-tqma7: add SPI-NOR flash

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Date:   Mon, 2 Nov 2020 09:24:31 +0100
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Matthias Schiffer <matthias.schiffer@...tq-group.com>
Cc:     Rob Herring <robh+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] ARM: dts: imx7-tqma7: add SPI-NOR flash

Hi Matthias,

On 20-10-30 11:26, Matthias Schiffer wrote:
> The SPI-NOR flash on the SoM was missing from the device tree.
> 
> Signed-off-by: Matthias Schiffer <matthias.schiffer@...tq-group.com>
> ---
>  arch/arm/boot/dts/imx7-tqma7.dtsi | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> v2: change node name to flash@0
> 
> 
> diff --git a/arch/arm/boot/dts/imx7-tqma7.dtsi b/arch/arm/boot/dts/imx7-tqma7.dtsi
> index 8773344b54aa..22f4194322ed 100644
> --- a/arch/arm/boot/dts/imx7-tqma7.dtsi
> +++ b/arch/arm/boot/dts/imx7-tqma7.dtsi
> @@ -160,6 +160,20 @@
>  		>;
>  	};
>  
> +	pinctrl_qspi: qspigrp {
> +		fsl,pins = <
> +			MX7D_PAD_EPDC_DATA00__QSPI_A_DATA0	0x5A
> +			MX7D_PAD_EPDC_DATA01__QSPI_A_DATA1	0x5A
> +			MX7D_PAD_EPDC_DATA02__QSPI_A_DATA2	0x5A
> +			MX7D_PAD_EPDC_DATA03__QSPI_A_DATA3	0x5A
> +			MX7D_PAD_EPDC_DATA05__QSPI_A_SCLK	0x11
> +			MX7D_PAD_EPDC_DATA06__QSPI_A_SS0_B	0x54
> +			MX7D_PAD_EPDC_DATA07__QSPI_A_SS1_B	0x54

As far as I know we are using GPIO based chip selects and not the one
from the controller-IP or is this different for qspi?

> +			/* #QSPI_RESET */
> +			MX7D_PAD_EPDC_DATA04__GPIO2_IO4		0x40000052

Do you really need to mux the reset-gpio?

> +		>;
> +	};
> +
>  	pinctrl_usdhc3: usdhc3grp {
>  		fsl,pins = <
>  			MX7D_PAD_SD3_CMD__SD3_CMD		0x59
> @@ -217,6 +231,22 @@
>  	};
>  };
>  
> +&qspi {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_qspi>;
> +	status = "okay";
> +
> +	flash0: flash@0 {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		compatible = "jedec,spi-nor";
> +		spi-max-frequency = <29000000>;
> +		spi-rx-bus-width = <4>;
> +		spi-tx-bus-width = <4>;
> +		reg = <0>;

Please check Documentation/devicetree/bindings/mtd/partition.txt to see
how partitions are added nowadays. With this in mind you should reorder
the node to:

	compatible = "jedec,spi-nor";
	reg = <0>;
	spi-max-frequency = <29000000>;
	spi-rx-bus-width = <4>;
	spi-tx-bus-width = <4>;


Regards,
  Marco

> +	};
> +};
> +
>  &sdma {
>  	status = "okay";
>  };
> -- 
> 2.17.1
> 
> 
>