linux-kernel - Re: [RFCv1 2/5] arm64: dts: meson: Add missing pwm control gpio signal for pwm-regulator

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Date:   Mon, 7 Oct 2019 16:20:27 +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 2/5] arm64: dts: meson: Add missing pwm control gpio
 signal for pwm-regulator

On 07/10/2019 15:16, Anand Moon wrote:
> As per schematics add missing VDDCPUA_PWM and VDDCPUB_PWM
> gpio signal use to enable/disable the pwm regulator for DVFS.
> 
> Fixes: d14734a04a8a (arm64: dts: meson-g12b-odroid-n2: enable DVFS)
> 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 | 4 ++++
>  1 file changed, 4 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 a9a661258886..66262a6ab3fe 100644
> --- a/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> +++ b/arch/arm64/boot/dts/amlogic/meson-g12b-odroid-n2.dts
> @@ -135,6 +135,8 @@
>  
>  		regulator-boot-on;
>  		regulator-always-on;
> +		/* VDDCPUA_PWM */
> +		enable-gpios = <&gpio GPIOE_1 GPIO_ACTIVE_HIGH>;
>  	};
>  
>  	vddcpu_b: regulator-vddcpu-b {
> @@ -154,6 +156,8 @@
>  
>  		regulator-boot-on;
>  		regulator-always-on;
> +		/* VDDCPUB_PWM */
> +		enable-gpios = <&gpio GPIOE_2 GPIO_ACTIVE_HIGH>;
>  	};
>  
>  	hub_5v: regulator-hub_5v {
> 

Same as 5V_EN, 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.

This GPIO id controlles by the PSCI call to SCP to enable/disable
the CPU clusters.

Neil