linux-kernel - Re: [PATCH 1/1] ARM: dts: sunxi: Update dts for A20-OLinuXino boards

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Date:   Tue, 28 Nov 2017 22:32:53 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Stefan Mavrodiev <stefan@...mex.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Chen-Yu Tsai <wens@...e.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH 1/1] ARM: dts: sunxi: Update dts for A20-OLinuXino boards

Hi Stefan,

On Mon, Nov 27, 2017 at 02:03:51PM +0200, Stefan Mavrodiev wrote:
> There will be option with 16MB flash for the following boards:
> 
>   * A20-OLinuXino-MICRO Rev.K
>   * A20-OLinuXino-LIME Rev.J
>   * A20-OLinuXino-LIME2 Rev.J
>   * A20-SOM-EVB Rev.E
> 
> The used flash chip is Winbond W25Q128FV, which is connected to
> SPI0 port. Since this is optional feature, spi0 node is dissabled
> by default. Also this option is incompatible with NAND flash, so
> they shouldn't be enabled at the same time.
> 
> Signed-off-by: Stefan Mavrodiev <stefan@...mex.com>
> ---
>  arch/arm/boot/dts/sun7i-a20-olimex-som-evb.dts  | 14 ++++++++++++++
>  arch/arm/boot/dts/sun7i-a20-olinuxino-lime.dts  | 14 ++++++++++++++
>  arch/arm/boot/dts/sun7i-a20-olinuxino-lime2.dts | 14 ++++++++++++++
>  arch/arm/boot/dts/sun7i-a20-olinuxino-micro.dts | 14 ++++++++++++++
>  4 files changed, 56 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun7i-a20-olimex-som-evb.dts b/arch/arm/boot/dts/sun7i-a20-olimex-som-evb.dts
> index 64c8ef9..98b7697 100644
> --- a/arch/arm/boot/dts/sun7i-a20-olimex-som-evb.dts
> +++ b/arch/arm/boot/dts/sun7i-a20-olimex-som-evb.dts
> @@ -291,6 +291,20 @@
>  	status = "okay";
>  };
>  
> +&spi0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&spi0_pins_b>,<&spi0_cs0_pins_b>;
> +	status = "disabled";
> +
> +	flash@0 {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		compatible = "winbond,w25q128","jedec,spi-nor";
> +		reg = <0>;
> +		spi-max-frequency = <40000000>;
> +	};
> +};
> +

So those kind of variations are usually best handled using overlays.

This as become quite convenient using the FIT image rework that
Pantelis did here:
https://lists.denx.de/pipermail/u-boot/2017-June/296879.html

and got merged since 2017.11.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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