linux-kernel - Re: [PATCH v2] ARM: dts: sunxi: Add num-cs for A20 spi nodes

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Date:   Tue, 27 Dec 2016 10:11:34 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Emmanuel Vadot <manu@...ouilliste.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ARM: dts: sunxi: Add num-cs for A20 spi nodes

Hi,

On Tue, Dec 27, 2016 at 1:47 AM, Emmanuel Vadot <manu@...ouilliste.com> wrote:
> The spi0 controller on the A20 have up to 4 CS (Chip Select) while the
> others three only have 1.
> Add the num-cs property to each node.
> The current driver doesn't read this property but this is useful for
> downstream user of DTS (FreeBSD for example).
>
> Signed-off-by: Emmanuel Vadot <manu@...ouilliste.com>
> ---
>
> Changes in v2:
>  * Explain that driver doesn't support this but that it is useful
>  for downstream users of DTS.
>
>  arch/arm/boot/dts/sun7i-a20.dtsi | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm/boot/dts/sun7i-a20.dtsi b/arch/arm/boot/dts/sun7i-a20.dtsi
> index 94cf5a1c7172..ed21982c81cb 100644
> --- a/arch/arm/boot/dts/sun7i-a20.dtsi
> +++ b/arch/arm/boot/dts/sun7i-a20.dtsi
> @@ -871,6 +871,7 @@
>                         status = "disabled";
>                         #address-cells = <1>;
>                         #size-cells = <0>;
> +                       num-cs = 4;

The numbers need to be enclosed in angle brackets.

ChenYu

>                 };
>
>                 spi1: spi@...06000 {
> @@ -885,6 +886,7 @@
>                         status = "disabled";
>                         #address-cells = <1>;
>                         #size-cells = <0>;
> +                       num-cs = 1;
>                 };
>
>                 emac: ethernet@...0b000 {
> @@ -1037,6 +1039,7 @@
>                         status = "disabled";
>                         #address-cells = <1>;
>                         #size-cells = <0>;
> +                       num-cs = 1;
>                 };
>
>                 ahci: sata@...18000 {
> @@ -1079,6 +1082,7 @@
>                         status = "disabled";
>                         #address-cells = <1>;
>                         #size-cells = <0>;
> +                       num-cs = 1;
>                 };
>
>                 pio: pinctrl@...20800 {
> --
> 2.11.0
>