linux-kernel - Re: [PATCH] ARM: dts: Provide support for reading ID code from MVB device (BK4)

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Date:   Mon, 26 Nov 2018 22:36:22 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Lukasz Majewski <lukma@...x.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Stefan Agner <stefan@...er.ch>,
        Fabio Estevam <festevam@...il.com>,
        Fabio Estevam <fabio.estevam@....com>
Subject: Re: [PATCH] ARM: dts: Provide support for reading ID code from MVB
 device (BK4)

On Tue, Nov 13, 2018 at 01:12:13PM +0100, Lukasz Majewski wrote:
> The procedure to read this ID value is as follows:
> 
> rmmod spi_fsl_dspi
> insmod spi-gpio.ko
> 
> echo 504 > /sys/class/gpio/export
> cat /sys/class/gpio/gpio504/value
> ...
> echo 511 > /sys/class/gpio/export
> cat /sys/class/gpio/gpio511/value
> 
> rmmod spi-gpio.ko
> insmod spi_fsl_dspi
> 
> Signed-off-by: Lukasz Majewski <lukma@...x.de>

A prefix like 'ARM: dts: vf610-bk4: ...' might be better.

> ---
>  arch/arm/boot/dts/vf610-bk4.dts | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/vf610-bk4.dts b/arch/arm/boot/dts/vf610-bk4.dts
> index cab95714c058..f01c735807ae 100644
> --- a/arch/arm/boot/dts/vf610-bk4.dts
> +++ b/arch/arm/boot/dts/vf610-bk4.dts
> @@ -59,6 +59,29 @@
>  		regulator-min-microvolt = <3300000>;
>  		regulator-max-microvolt = <3300000>;
>  	};
> +
> +	spi_gpio {

We recommend hyphen rather than underscore be used in node name.

> +		compatible = "spi-gpio";
> +		pinctrl-0 = <&pinctrl_gpio_spi>;
> +		pinctrl-names = "default";
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		/* PTD12 ->RPIO[91] */
> +		sck-gpios  = <&gpio2 27 GPIO_ACTIVE_LOW>;
> +		/* PTD10 ->RPIO[89] */
> +		miso-gpios = <&gpio2 25 GPIO_ACTIVE_HIGH>;
> +		num-chipselects = <0>;
> +
> +		72xx165@0 {

Please use a generic name for the node.

Shawn

> +			compatible = "pisosr-gpio";
> +			reg = <0>;
> +			gpio-controller;
> +			#gpio-cells = <2>;
> +			/* PTB18 -> RGPIO[40] */
> +			load-gpios  = <&gpio1 8 GPIO_ACTIVE_LOW>;
> +			spi-max-frequency = <100000>;
> +		};
> +	};
>  };
>  
>  &adc0 {
> @@ -430,6 +453,14 @@
>  		>;
>  	};
>  
> +	pinctrl_gpio_spi: pinctrl-gpio-spi {
> +		fsl,pins = <
> +			VF610_PAD_PTB18__GPIO_40        0x1183
> +			VF610_PAD_PTD10__GPIO_89        0x1183
> +			VF610_PAD_PTD12__GPIO_91        0x1183
> +		>;
> +	};
> +
>  	pinctrl_i2c2: i2c2grp {
>  		fsl,pins = <
>  			VF610_PAD_PTA22__I2C2_SCL               0x34df
> -- 
> 2.11.0
>