linux-kernel - Re: [RFCv1 1/5] arm64: dts: meson: Add missing 5V

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Date:   Mon, 7 Oct 2019 16:19:31 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Anand Moon <linux.amoon@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFCv1 1/5] arm64: dts: meson: Add missing 5V_EN gpio signal for
 VCC5V regulator

Hi Anand,

On 07/10/2019 15:16, Anand Moon wrote:
> As per schematics add missing 5V_EN gpio signal to enable
> VCC5V regulator node.
> 
> Fixes: c35f6dc5c377 (arm64: dts: meson: Add minimal support for Odroid-N2)
> Cc: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> Cc: Jerome Brunet <jbrunet@...libre.com>
> Cc: Neil Armstrong <narmstrong@...libre.com>
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
>  arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> index 42f15405750c..a9a661258886 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> @@ -94,6 +94,9 @@
>  		regulator-max-microvolt = <5000000>;
>  		regulator-always-on;
>  		vin-supply = <&main_12v>;
> +		/* U12 NB679GD 5V_EN */
> +		gpio = <&gpio GPIOH_8 GPIO_OPEN_DRAIN>;
> +		enable-active-high;

This GPIO is handled by the BL301 SCP firmware, I'm personally against
adding this to the DT since it's out of control of Linux or any OS.

Neil

>  	};
>  
>  	vcc_1v8: regulator-vcc_1v8 {
>