linux-kernel - Re: [PATCH] ARM: dts: sun8i-h2-plus-bananapi-m2-zero: add gpio-poweroff to DT

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Message-ID: <4bf42c9e-9f70-bc30-1a88-44a127cd989a@sholland.org>
Date:   Mon, 23 Nov 2020 22:14:45 -0600
From:   Samuel Holland <samuel@...lland.org>
To:     Michael Klein <michael@...sekall.de>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: dts: sun8i-h2-plus-bananapi-m2-zero: add
 gpio-poweroff to DT

On 11/23/20 10:10 AM, Michael Klein wrote:
> Add gpio-poweroff node to allow the board to power itself off after
> shutdown by disabling the SYSTEM and CPUX regulators (U5 resp. U6).
> The RST button can be used to restart the board.

The PSCI client will override this driver once the PSCI implementation
is upgraded to v0.2 or newer functions. So having this around should
cause no compatibility issues (although it would print an error in dmesg
at that point). This seems like a reasonable thing to do for the other
H2+/H3 boards that use a similar regulator layout.

Reviewed-by: Samuel Holland <samuel@...lland.org>

> Signed-off-by: Michael Klein <michael@...sekall.de>
> ---
>  arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts b/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts
> index 4c6704e4c57e..76e79e6db733 100644
> --- a/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts
> +++ b/arch/arm/boot/dts/sun8i-h2-plus-bananapi-m2-zero.dts
> @@ -46,6 +46,11 @@ sw4 {
>  		};
>  	};
>  
> +	gpio_poweroff {
> +		compatible = "gpio-poweroff";
> +		gpios = <&r_pio 0 8 GPIO_ACTIVE_LOW>; /* PL8 */
> +	};
> +
>  	reg_vdd_cpux: vdd-cpux-regulator {
>  		compatible = "regulator-gpio";
>  		regulator-name = "vdd-cpux";
>