linux-kernel - Re: [PATCH 2/2] ARM: dts: TS-7970: add basic device tree

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Date:   Mon, 20 Nov 2017 21:37:04 -0200
From:   Fabio Estevam <festevam@...il.com>
To:     Sebastien Bourdelin <sebastien.bourdelin@...oirfairelinux.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        kernel@...oirfairelinux.com,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Fabio Estevam <fabio.estevam@....com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Mark Rutland <mark.rutland@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>, kris@...eddedarm.com,
        Mark Featherston <mark@...eddedarm.com>,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH 2/2] ARM: dts: TS-7970: add basic device tree

Hi Sebastien,

On Mon, Nov 20, 2017 at 7:15 PM, Sebastien Bourdelin
<sebastien.bourdelin@...oirfairelinux.com> wrote:

> +&ecspi2 {
> +       cs-gpios = <
> +               &gpio5 31 GPIO_ACTIVE_HIGH
> +               &gpio7 12 GPIO_ACTIVE_HIGH
> +               &gpio5 18 GPIO_ACTIVE_HIGH
> +       >;
> +       pinctrl-names = "default";
> +       pinctrl-0 = <&pinctrl_ecspi2>;
> +       status = "okay";
> +
> +       spidevfpga: spi@1 {
> +               compatible = "spidev";
> +               reg = <1>;
> +               spi-max-frequency = <1000000>;

According to drivers/spi/spidev.c:

/*
* spidev should never be referenced in DT without a specific
* compatible string, it is a Linux implementation thing
* rather than a description of the hardware.
*/