linux-kernel - Re: [linux-sunxi] [PATCH 01/11] arm64: allwinner: a64: enable RSB on A64

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Date:   Wed, 5 Apr 2017 11:48:43 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        devicetree <devicetree@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [linux-sunxi] [PATCH 01/11] arm64: allwinner: a64: enable RSB on A64

On Wed, Apr 5, 2017 at 2:01 AM, Icenowy Zheng <icenowy@...c.io> wrote:
> Allwinner A64 have a RSB controller like the one on A23/A33 SoCs.
>
> Add it and its pinmux.
>
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> ---
>  arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> index 6bc606b4d74d..9a75b1c7c91a 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> @@ -420,6 +420,27 @@
>                         #gpio-cells = <3>;
>                         interrupt-controller;
>                         #interrupt-cells = <3>;
> +
> +                       r_rsb_pins: rsb@0 {
> +                               pins = "PL0", "PL1";
> +                               function = "s_rsb";
> +                               drive-strength = <20>;

We don't need this. The hardware default should be enough.

> +                               bias-pull-up;

Boards should have external pull-ups for these pins, as the PMICs
start up in I2C mode. If any board actually doesn't have them and
needs the internal pull-ups, they should be set at the board level.

Otherwise,

Acked-by: Chen-Yu Tsai <wens@...e.org>

> +                       };
> +               };
> +
> +               r_rsb: rsb@...3400 {
> +                       compatible = "allwinner,sun8i-a23-rsb";
> +                       reg = <0x01f03400 0x400>;
> +                       interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_HIGH>;
> +                       clocks = <&r_ccu 6>;
> +                       clock-frequency = <3000000>;
> +                       resets = <&r_ccu 2>;
> +                       pinctrl-names = "default";
> +                       pinctrl-0 = <&r_rsb_pins>;
> +                       status = "disabled";
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
>                 };
>         };
>  };
> --
> 2.12.2
>
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